10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

 ____________________________________________________________

Form 10-Q

 ____________________________________________________________

ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Quarterly Period Ended June 30, 2015

Or

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number 001-31909

  ____________________________________________________________

ASPEN INSURANCE HOLDINGS LIMITED

(Exact name of registrant as specified in its charter)

  ____________________________________________________________

Bermuda	Not Applicable
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
141 Front Street Hamilton, Bermuda	HM 19
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code

(441) 295-8201

____________________________________________________________

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter periods that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ý    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ý    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	ý	Accelerated filer	¨
Non-accelerated filer	¨ (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨   No  ý

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

As of July 24, 2015, there were 60,777,875 outstanding ordinary shares, with a par value of 0.15144558¢ per ordinary share, outstanding.

INDEX

		Page
PART I. FINANCIAL INFORMATION
Item 1.	Unaudited Condensed Consolidated Financial Statements	3
	Unaudited Condensed Consolidated Balance Sheets as at June 30, 2015 and December 31, 2014	3
	Unaudited Condensed Consolidated Statements of Operations and Other Comprehensive Income for the Three and Six Months Ended June 30, 2015 and 2014	5
	Unaudited Condensed Consolidated Statements of Changes in Shareholders’ Equity for the Six Months Ended June 30, 2015 and 2014	6
	Unaudited Condensed Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2015 and 2014	7
	Notes to the Unaudited Condensed Consolidated Financial Statements	9
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	41
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	66
Item 4.	Controls and Procedures	67
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	69
Item 1A.	Risk Factors	69
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	69
Item 3.	Defaults Upon Senior Securities	69
Item 4.	Mine Safety Disclosures	69
Item 5.	Other Information	69
Item 6.	Exhibits	71
SIGNATURES		72
CERTIFICATIONS

2

PART I

FINANCIAL INFORMATION

Item 1. Unaudited Condensed Consolidated Financial Statements

ASPEN INSURANCE HOLDINGS LIMITED

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS

As at June 30, 2015 and December 31, 2014

($ in millions, except share and per share amounts)

	As at June 30, 2015		As at December 31, 2014
ASSETS
Investments:
Fixed income securities, available for sale at fair value (amortized cost — $5,512.8 and $5,462.9)	$	5,629.7	$	5,630.0
Fixed income securities, trading at fair value (amortized cost — $771.4 and $760.9)	777.7		771.0
Equity securities, available for sale at fair value (cost — $Nil and $82.6)	—		109.9
Equity securities, trading at fair value (cost — $717.5 and $585.2)	729.3		616.0
Short-term investments, available for sale at fair value (amortized cost — $184.0 and $258.2)	184.1		258.3
Short-term investments, trading at fair value (amortized cost — $1.1 and $0.2)	1.1		0.2
Catastrophe bonds, trading at fair value (cost — $32.6 and $34.4)	32.3		34.8
Other investments, equity method	9.5		8.7
Total investments	7,363.7		7,428.9
Cash and cash equivalents (including $100.3 and $176.7 within consolidated variable interest entities)	1,148.4		1,178.5
Reinsurance recoverables
Unpaid losses	337.3		350.0
Ceded unearned premiums	257.1		206.8
Receivables
Underwriting premiums	1,249.9		1,011.7
Other	108.1		90.2
Funds withheld	44.5		46.9
Deferred policy acquisition costs	349.0		299.0
Derivatives at fair value	4.1		8.0
Receivable for securities sold	5.5		2.3
Office properties and equipment	65.6		62.2
Deferred taxation	0.9		—
Other assets	1.9		13.6
Intangible assets	18.2		18.2
Total assets	$	10,954.2	$	10,716.3

See accompanying notes to unaudited condensed consolidated financial statements.

3

ASPEN INSURANCE HOLDINGS LIMITED

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS

As at June 30, 2015 and December 31, 2014

($ in millions, except share and per share amounts)

	As at June 30, 2015		As at December 31, 2014
LIABILITIES
Insurance reserves
Losses and loss adjustment expenses	$	4,815.9	$	4,750.8
Unearned premiums	1,702.8		1,441.8
Total insurance reserves	6,518.7		6,192.6
Payables
Reinsurance premiums	164.5		92.0
Current taxation	25.9		18.3
Deferred taxation	6.2		3.1
Accrued expenses and other payables	242.7		356.9
Liabilities under derivative contracts	7.2		14.3
Total payables	446.5		484.6
Loan notes issued by variable interest entities, at fair value	76.2		70.7
Long-term debt	549.2		549.1
Total liabilities	$	7,590.6	$	7,297.0
Commitments and contingent liabilities (see Note 16)	—		—
SHAREHOLDERS’ EQUITY
Ordinary shares:
60,777,875 shares of par value 0.15144558¢ each (December 31, 2014 — 62,017,368)	$	0.1	$	0.1
Preference shares:
11,000,000 5.95% shares of par value 0.15144558¢ each (December 31, 2014 — 11,000,000)	—		—
5,327,500 7.401% shares of par value 0.15144558¢ each (December 31, 2014 — 5,327,500)	—		—
6,400,000 7.250% shares of par value 0.15144558¢ each (December 31, 2014 — 6,400,000)	—		—
Non-controlling interest	1.0		0.5
Additional paid-in capital	1,061.7		1,134.3
Retained earnings	2,182.3		2,050.1
Accumulated other comprehensive income, net of taxes	118.5		234.3
Total shareholders’ equity	3,363.6		3,419.3
Total liabilities and shareholders’ equity	$	10,954.2	$	10,716.3

See accompanying notes to unaudited condensed consolidated financial statements.

4

ASPEN INSURANCE HOLDINGS LIMITED

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

AND OTHER COMPREHENSIVE INCOME

($ in millions, except share and per share amounts)

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Revenues
Net earned premium	$	609.4		$	616.2		$	1,203.0		$	1,182.7
Net investment income	46.7			46.1			94.1			95.6
Realized and unrealized investment gains	13.5			34.6			70.9			52.5
Other income	(1.2		)	3.2			2.7			3.8
Total revenues	668.4			700.1			1,370.7			1,334.6
Expenses
Losses and loss adjustment expenses	360.5			337.1			666.6			625.2
Amortization of deferred policy acquisition costs	114.1			108.9			233.4			220.9
General, administrative and corporate expenses	95.4			108.8			197.6			204.4
Interest on long-term debt	7.3			7.3			14.7			14.7
Change in fair value of derivatives	(2.0		)	4.6			5.8			3.5
Change in fair value of loan notes issued by variable interest entities	3.3			2.6			6.2			6.0
Realized and unrealized investment losses	28.8			3.3			43.3			7.6
Net realized and unrealized foreign exchange losses/(gains)	11.6			(10.7		)	18.0			(10.8		)
Other expenses	(1.8		)	1.2			0.8			1.9
Total expenses	617.2			563.1			1,186.4			1,073.4
Income from operations before income tax	51.2			137.0			184.3			261.2
Income tax expense	(2.2		)	(6.2		)	(7.3		)	(10.0		)
Net income	$	49.0		$	130.8		$	177.0		$	251.2
Amount attributable to non-controlling interest	(0.5		)	—			(0.5		)	(0.1		)
Net income attributable to Aspen Insurance Holdings Limited’s ordinary shareholders	$	48.5		$	130.8		$	176.5		$	251.1
Other Comprehensive Income:
Available for sale investments:
Reclassification adjustment for net realized losses/(gains) on investments included in net income	$	0.6		$	(1.9	)	$	(31.7	)	$	(2.3	)
Change in net unrealized (losses)/gains on available for sale securities held	(78.2		)	35.0			(45.8		)	58.0
Net change from current period hedged transactions	5.1			—			2.7			—
Change in foreign currency translation adjustment	(15.7		)	22.8			(43.4		)	18.0
Other comprehensive (loss)/income, gross of tax	(88.2		)	55.9			(118.2		)	73.7
Tax thereon:
Reclassification adjustment for net realized (losses)/gains on investments included in net income	—			(0.1		)	0.4			0.1
Change in foreign currency translation adjustment	(0.5		)	—			1.1			—
Change in net unrealized gains/(losses) on available for sale securities held	4.2			(3.5		)	0.9			(6.0		)
Total tax on other comprehensive income/(loss)	3.7			(3.6		)	2.4			(5.9		)
Other comprehensive (loss)/income net of tax	(84.5		)	52.3			(115.8		)	67.8
Total comprehensive (loss)/income attributable to Aspen Insurance Holdings Limited’s ordinary shareholders	$	(36.0	)	$	183.1		$	60.7		$	318.9
Per Share Data
Weighted average number of ordinary share and share equivalents
Basic	61,408,633			65,447,128			61,775,646			65,368,675
Diluted	62,896,907			66,700,368			63,164,863			66,646,319
Basic earnings per ordinary share adjusted for preference share dividends	$	0.64		$	1.85		$	2.55		$	3.55
Diluted earnings per ordinary share adjusted for preference share dividends	$	0.62		$	1.82		$	2.50		$	3.48

See accompanying notes to unaudited condensed consolidated financial statements.

5

ASPEN INSURANCE HOLDINGS LIMITED

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF

CHANGES IN SHAREHOLDERS’ EQUITY

($ in millions)

	Six Months Ended June 30,
	2015			2014
Ordinary shares
Beginning and end of the period	$	0.1		$	0.1
Preference shares
Beginning and end of the period	—			—
Non-controlling interest
Beginning of the period	0.5			(0.3		)
Net change attributable to non-controlling interest for the period	0.5			0.1
End of the period	1.0			(0.2		)
Additional paid-in capital
Beginning of the period	1,134.3			1,297.4
New ordinary shares issued	4.0			1.8
Ordinary shares repurchased and canceled	(83.7		)	(30.9		)
Share-based compensation	7.1			8.4
End of the period	1,061.7			1,276.7
Retained earnings
Beginning of the period	2,050.1			1,783.3
Net income for the period	177.0			251.2
Dividends on ordinary shares	(25.4		)	(24.8		)
Dividends on preference shares	(18.9		)	(18.9		)
Net change attributable to non-controlling interest for the period	(0.5		)	(0.1		)
End of the period	2,182.3			1,990.7
Accumulated other comprehensive income:
Cumulative foreign currency translation adjustments, net of taxes:
Beginning of the period	72.7			88.6
Change for the period, net of income tax	(42.3		)	18.0
End of the period	30.4			106.6
Loss on derivatives, net of taxes:
Beginning of the period	(3.8		)	—
Net change from current period hedged transaction	2.7			—
End of the period	(1.1		)	—
Unrealized appreciation on investments, net of taxes:
Beginning of the period	165.4			130.5
Change for the period, net of taxes	(76.2		)	49.8
End of the period	89.2			180.3
Total accumulated other comprehensive income, net of taxes	118.5			286.9
Total shareholders’ equity	$	3,363.6		$	3,554.2

See accompanying notes to unaudited condensed consolidated financial statements.

6

ASPEN INSURANCE HOLDINGS LIMITED

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

($ in millions)

	Six Months Ended June 30,
	2015			2014
Cash flows from operating activities:
Net income	$	177.0		$	251.2
Proportion due to non-controlling interest	(0.5		)	(0.1		)
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	15.0			18.7
Share-based compensation	7.1			8.4
Realized and unrealized investment (gains)	(70.9		)	(52.5		)
Realized and unrealized investment losses	43.3			7.6
Change in fair value of loan notes issued by variable interest entities	6.2			6.0
Net realized and unrealized investment foreign exchange losses	12.4			21.3
Loss on derivative contracts	2.7			—
Changes in:
Insurance reserves:
Losses and loss adjustment expenses	90.9			96.5
Unearned premiums	235.6			286.0
Reinsurance recoverables:
Unpaid losses	11.5			(24.6		)
Ceded unearned premiums	(50.4		)	(64.7		)
Other receivables	(20.9		)	(16.1		)
Deferred policy acquisition costs	(49.7		)	(44.1		)
Reinsurance premiums payable	73.1			(20.6		)
Funds withheld	2.4			(1.3		)
Premiums receivable	(249.8		)	(196.4		)
Deferred taxes	7.2			(0.1		)
Income tax payable	(4.8		)	11.7
Accrued expenses and other payables	(40.6		)	15.0
Fair value of derivatives and settlement of liabilities under derivatives	(3.2		)	7.9
Long-term debt	0.1			0.1
Intangible assets	—			0.1
Other assets	10.7			(2.1		)
Net cash generated by operating activities	$	204.4		$	307.9

See accompanying notes to unaudited condensed consolidated financial statements.

7

ASPEN INSURANCE HOLDINGS LIMITED

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

($ in millions)

	Six Months Ended June 30,
	2015			2014
Cash flows (used in) investing activities:
(Purchases) of fixed income securities — Available for sale	$	(939.3	)	$	(918.1	)
(Purchases) of fixed income securities — Trading	(275.5		)	(398.9		)
Proceeds from sales and maturities of fixed income securities — Available for sale	861.5			1,015.9
Proceeds from sales and maturities of fixed income securities — Trading	264.5			372.2
(Purchases) of equity securities — Trading	(268.9		)	(118.9		)
Net proceeds/(purchases) of catastrophe bonds — Trading	1.8			(24.3		)
Proceeds from sales of equity securities — Available for sale	108.6			15.6
Proceeds from sales of equity securities — Trading	151.1			18.2
(Purchases) of short-term investments — Available for sale	(109.3		)	(268.9		)
Sale of short-term investments — Available for sale	172.4			92.9
(Purchases) of short-term investments — Trading	(15.7		)	(80.2		)
Sale of short-term investments — Trading	14.8			66.2
Net change in receivable for securities sold	5.8			19.8
Proceeds from other investments	—			37.3
(Purchases) of equipment	(6.0		)	(10.2		)
Investment in Micro-insurance venture	(0.8		)	—
Net cash (used in) investing activities	(35.0		)	(181.4		)
Cash flows (used in) financing activities:
Proceeds from the issuance of ordinary shares, net of issuance costs	4.0			1.8
Ordinary shares repurchased	(83.7		)	(30.9		)
Repayment of long-term debt issued by Silverton	(67.0		)	—
Dividends paid on ordinary shares	(25.4		)	(24.8		)
Dividends paid on preference shares	(18.9		)	(18.9		)
Net cash (used in) financing activities	(191.0		)	(72.8		)
Effect of exchange rate movements on cash and cash equivalents	(8.5		)	(2.1		)
(Decrease)/Increase in cash and cash equivalents	(30.1		)	51.6
Cash and cash equivalents at beginning of period	1,178.5			1,293.6
Cash and cash equivalents at end of period	$	1,148.4		$	1,345.2
Supplemental disclosure of cash flow information:
Net cash (received)/paid during the period for income tax	$	(4.0	)	$	4.0
Cash paid during the period for interest	$	14.5		$	14.6

See accompanying notes to unaudited condensed consolidated financial statements.

8

ASPEN INSURANCE HOLDINGS LIMITED

NOTES TO THE UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

1. History and Organization

Aspen Insurance Holdings Limited (“Aspen Holdings”) was incorporated on May 23, 2002 and holds subsidiaries that provide insurance and reinsurance on a worldwide basis. Its principal operating subsidiaries are Aspen Insurance UK Limited (“Aspen U.K.”), Aspen Bermuda Limited (“Aspen Bermuda”), Aspen Specialty Insurance Company (“Aspen Specialty”), Aspen American Insurance Company (“AAIC”) and Aspen Underwriting Limited (corporate member of Lloyd’s Syndicate 4711, “AUL”) (collectively, the “Operating Subsidiaries”). We also established Aspen Capital Management, Ltd and other related entities (collectively, “ACM”) to leverage our existing underwriting franchise, increase our operational flexibility in the capital markets and provide investors direct access to our underwriting expertise. In such regard, Silverton Re Ltd. (“Silverton”), a sidecar, was established in 2013 to attract third-party capital and to provide additional collateralized capacity to support Aspen Re’s global reinsurance business. References to the “Company,” “we,” “us” or “our” refer to Aspen Holdings or Aspen Holdings and its subsidiaries.

2. Basis of Preparation

The accompanying unaudited condensed consolidated financial statements have been prepared on the basis of generally accepted accounting principles in the United States (“U.S. GAAP”) for interim financial information and in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Results for the three and six months ended June 30, 2015 are not necessarily indicative of the results that may be expected for the year ended December 31, 2015. The unaudited condensed consolidated financial statements include the accounts of Aspen Holdings and its subsidiaries. All intercompany transactions and balances have been eliminated on consolidation.

The balance sheet as at December 31, 2014 has been derived from the audited consolidated financial statements at that date, but does not include all of the information and footnotes required by U.S. GAAP for complete financial statements. These unaudited condensed consolidated financial statements and notes thereto should be read in conjunction with the consolidated financial statements and notes thereto for the year ended December 31, 2014 contained in the Company’s Annual Report on Form 10-K filed with the United States Securities and Exchange Commission on February 23, 2015 (File No. 001-31909). There have been no changes to significant accounting policies from those disclosed in the Company’s Annual Report on Form 10-K.

Assumptions and estimates made by management have a significant effect on the amounts reported within the unaudited condensed consolidated financial statements. The most significant of these relate to losses and loss adjustment expenses, the value of investments, reinsurance recoverables and the fair value of derivatives. All material assumptions and estimates are regularly reviewed and adjustments made as necessary, but actual results could be significantly different from those expected when the assumptions or estimates were made.

Accounting Pronouncements Not Yet Adopted

On April 15, 2015, the Financial Accounting Standards Board (“FASB”) issued ASU 2015-04, “Compensation - Retirement Benefits (Topic 715)” which includes amendments that change the analysis that an entity must perform to determine whether it should consolidate certain types of legal entities. ASU 2015-02 is effective for fiscal years beginning after December 15, 2015. The Company does not expect this ASU to impact its consolidated financial statements as the Company does not possess a defined benefit pension plan.

On April 15, 2015, the FASB issued ASU 2015-05, “Intangibles - Goodwill and Other - Internal Use Software (Topic 350-40)” which will help entities evaluate the accounting for fees paid by a customer in a cloud computing arrangement. ASU 2015-05 is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2015. The Company does not expect this ASU to have a material impact on its consolidated financial statements.

On April 17, 2015, the FASB issued ASU 2015-03, “Interest - Imputation of Interest (Subtopic 835-30)” which requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. The ASU simplifies the presentation of debt issuance costs as part of FASB’s initiative to reduce complexity in accounting standards. ASU 2015-03 is effective for fiscal years beginning after December 15, 2015. The Company does not expect this ASU to have a material impact on its consolidated financial statements.

9

On April 30, 2015, the FASB issued ASU 2015-07, “Fair Value Measurement (Topic 820) Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent)” which removes the requirement to categorize within the fair value hierarchy all investments for which fair value is measured using the net asset value per share practical expedient. ASU 2015-07 is effective for annual periods beginning after December 15, 2015. The Company does not expect this ASU to have a material impact on its consolidated financial statements.

On May 8, 2015, the FASB issued ASU 2015-08, “Business Combinations (Topic 805) Pushdown Accounting” which conforms the FASB’s guidance on pushdown accounting with the SEC’s guidance. ASU 2015-08 is effective for annual periods beginning after December 15, 2015. The Company does not expect this ASU to have a material impact on its consolidated financial statements.

On May 21, 2015, the FASB issued ASU 2015-09, “Financial Services - Insurance (Topic 944) Disclosures About Short-Duration Contracts” which requires insurance entities to disclose additional information about the liability for unpaid claims and claim adjustment expenses, disclose information about significant changes in methodologies and assumptions used to calculate the liability for unpaid claims and claim adjustment expenses and disclose a rollforward of the liability for unpaid claims and claims adjustment expenses. ASU 2015-09 is effective for annual periods beginning after December 15, 2015 and interim periods within annual periods beginning after December 15, 2016. The Company does not expect this ASU to have a material impact on its consolidated financial results but it will have an impact on the disclosures in the Company’s Quarterly reports on Form 10-Q and Annual report on Form 10-K.

3. Reclassifications from Accumulated Other Comprehensive Income

The following table sets out the components of the Company’s accumulated other comprehensive income (“AOCI”) that are reclassified into the unaudited condensed consolidated statement of operations for the three and six months ended June 30, 2015 and 2014:

	Amount Reclassified from AOCI
Details about the AOCI Components	Three Months Ended June 30, 2015			Three Months Ended June 30, 2014			Affected Line Item in the Unaudited Condensed Consolidated Statement of Operations
	($ in millions)
Available for sale securities:
Realized gains on sale of securities	$	2.1		$	3.7		Realized and unrealized investment gains
Realized (losses) on sale of securities	(2.7		)	(1.8		)	Realized and unrealized investment losses
	(0.6		)	1.9			Income from operations before income tax
Tax on net realized gains of securities	—			0.1			Income tax expense
	$	(0.6	)	$	2.0		Net income
Foreign currency translation adjustments:
Foreign currency translation adjustments, before tax	(0.5		)	$	—		Net realized and unrealized foreign exchange gains/(losses)
	$	(0.5	)	$	—		Net income
Realized derivatives:
Net realized gains on settled derivatives	0.1			$	—		General, administrative and corporate expenses
	$	0.1		$	—		Net income
Total reclassifications from AOCI to the statement of operations, net of tax	$	(1.0	)	$	2.0		Net income

10

	Amount Reclassified from AOCI
Details about the AOCI Components	Six Months Ended June 30, 2015			Six Months Ended June 30, 2014			Affected Line Item in the Unaudited Condensed Consolidated Statement of Operations
	($ in millions)
Available for sale securities:
Realized gains on sale of securities	$	35.6		$	6.7		Realized and unrealized investment gains
Realized (losses) on sale of securities	(3.9		)	(4.4		)	Realized and unrealized investment losses
	31.7			2.3			Income from operations before income tax
Tax on net realized gains of securities	(0.4		)	(0.1		)	Income tax expense
Total reclassifications from AOCI to the statement of operations, net of tax	$	31.3		$	2.2		Net income
Foreign currency translation adjustments:
Foreign currency translation adjustments, before tax	1.1			$	—		Net realized and unrealized foreign exchange gains/(losses)
	$	1.1		$	—		Net income
Realized derivatives:
Net realized (losses) on settled derivatives	(2.7		)	$	—		General, administrative and corporate expenses
	$	(2.7	)	$	—		Net income
Total reclassifications from AOCI to the statement of operations, net of tax	$	29.7		$	2.2		Net income

4. Earnings per Ordinary Share

Basic earnings per ordinary share are calculated by dividing net income available to holders of Aspen Holdings’ ordinary shares by the weighted average number of ordinary shares outstanding. Diluted earnings per ordinary share are based on the weighted average number of ordinary shares and dilutive potential ordinary shares outstanding during the period of calculation using the treasury stock method. The following table sets forth the computation of basic and diluted earnings per share for the three and six months ended June 30, 2015 and 2014, respectively:

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
	($ in millions, except share and per share amounts)
Net income	$	49.0		$	130.8		$	177.0		$	251.2
Preference share dividends	(9.4		)	(9.4		)	(18.9		)	(18.9		)
Net profit attributable to non-controlling interest	(0.5		)	—			(0.5		)	(0.1		)
Basic and diluted net income available to ordinary shareholders	39.1			121.4			157.6			232.2
Ordinary shares:
Basic weighted average ordinary shares	61,408,633			65,447,128			61,775,646			65,368,675
Weighted average effect of dilutive securities(1)	1,488,274			1,253,240			1,389,217			1,277,644
Total diluted weighted average ordinary shares	62,896,907			66,700,368			63,164,863			66,646,319
Earnings per ordinary share:
Basic	$	0.64		$	1.85		$	2.55		$	3.55
Diluted	$	0.62		$	1.82		$	2.50		$	3.48

⁽¹⁾  Dilutive securities comprise: employee options, restricted share units and performance shares associated with the Company’s long term incentive plan, employee share purchase plans and director restricted stock units and options as described in Note 14.

11

Dividends. On July 22, 2015, the Company’s Board of Directors (“Board of Directors”) declared the following quarterly dividends:

	Dividend		Payable on:	Record Date:
Ordinary shares	$	0.21	August 25, 2015	August 7, 2015
7.401% preference shares	$	0.462563	October 1, 2015	September 15, 2015
7.250% preference shares	$	0.4531	October 1, 2015	September 15, 2015
5.95% preference shares	$	0.3719	October 1, 2015	September 15, 2015

5. Segment Reporting

The Company has two reporting business segments: Insurance and Reinsurance. In addition to the way the Company manages its business, the Company has considered similarities in economic characteristics, products, customers, distribution, the regulatory environment of the Company’s operating segments and quantitative thresholds to determine the Company’s reportable segments. Segment profit or loss for each of the Company’s operating segments is measured by underwriting profit or loss. Underwriting profit is the excess of net earned premiums over the sum of losses and loss expenses, amortization of deferred policy acquisition costs and general and administrative expenses. Underwriting profit or loss provides a basis for management to evaluate the segment’s underwriting performance.

Reinsurance Segment. The reinsurance segment consists of property catastrophe reinsurance, other property reinsurance (risk excess, pro rata and facultative), casualty reinsurance (U.S. treaty, international treaty and global facultative) and specialty reinsurance (credit and surety, agriculture, marine, aviation, engineering and other specialty). ACM forms part of property catastrophe reinsurance line of business as it currently focuses on property catastrophe business through the use of alternative capital. For a more detailed description of this segment, see Part I, Item 1, “Business — Business Segments — Reinsurance” in the Company’s 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission.

Insurance Segment. The insurance segment consists of property and casualty insurance, marine, aviation and energy insurance and financial and professional lines insurance. For a more detailed description of this segment, see Part I, Item 1 “Business — Business Segments — Insurance” in the Company’s 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission.

Non-underwriting Disclosures. The Company has provided additional disclosures for corporate and other (non-underwriting) income and expenses. Corporate and other income and expenses include net investment income, net realized and unrealized investment gains or losses, expenses associated with managing the group, certain strategic and non-recurring costs, changes in fair value of derivatives and changes in fair value of the loan notes issued by variable interest entities, interest expenses, net realized and unrealized foreign exchange gains or losses and income taxes, which are not allocated to the underwriting segments. Corporate expenses are not allocated to the Company’s operating segments as they typically do not fluctuate with the levels of premiums written and are not directly related to the Company’s segment operations. The Company does not allocate its assets by segment as it evaluates underwriting results of each segment separately from the results of the Company’s investment portfolio.

12

The following tables provide a summary of gross and net written and earned premiums, underwriting results, ratios and reserves for each of the Company’s business segments for the three months ended June 30, 2015 and 2014:

	Three Months Ended June 30, 2015
	Reinsurance			Insurance			Total
	($ in millions)
Underwriting Revenues
Gross written premiums	$	260.7		$	462.1		$	722.8
Net written premiums	238.2			406.2			644.4
Gross earned premiums	287.2			423.2			710.4
Net earned premiums	268.3			341.1			609.4
Underwriting Expenses
Losses and loss adjustment expenses	116.3			244.2			360.5
Amortization of deferred policy acquisition costs	50.4			63.7			114.1
General and administrative expenses	35.4			45.2			80.6
Underwriting income/(loss)	$	66.2		$	(12.0	)	54.2
Corporate expenses							(14.8		)
Net investment income							46.7
Realized and unrealized investment gains							13.5
Realized and unrealized investment losses							(28.8		)
Change in fair value of loan notes issued by variable interest entities							(3.3		)
Change in fair value of derivatives							2.0
Interest expense on long term debt							(7.3		)
Net realized and unrealized foreign exchange (losses)							(11.6		)
Other income							(1.2		)
Other expenses							1.8
Income before tax							$	51.2
Net reserves for loss and loss adjustment expenses	$	2,411.6		$	2,067.0		$	4,478.6
Ratios
Loss ratio	43.3		%	71.6		%	59.2		%
Policy acquisition expense ratio	18.8			18.7			18.7
General and administrative expense ratio	13.2			13.3			15.7			(1)
Expense ratio	32.0			32.0			34.4
Combined ratio	75.3		%	103.6		%	93.6		%

⁽¹⁾  The general and administrative expense ratio in the total column includes corporate expenses.

13

	Three Months Ended June 30, 2014
	Reinsurance			Insurance			Total
	( $ in millions)
Underwriting Revenues
Gross written premiums	$	298.4		$	480.9		$	779.3
Net written premiums	286.9			399.5			686.4
Gross earned premiums	289.7			404.5			694.2
Net earned premiums	278.8			337.4			616.2
Underwriting Expenses
Losses and loss adjustment expenses	125.0			212.1			337.1
Amortization of deferred policy acquisition costs	49.8			59.1			108.9
General and administrative expenses	35.8			51.1			86.9
Underwriting income	$	68.2		$	15.1		83.3
Corporate expenses							(21.9		)
Net investment income							46.1
Realized and unrealized investment gains							34.6
Realized and unrealized investment losses							(3.3		)
Change in fair value of loan notes issued by variable interest entities							(2.6		)
Change in fair value of derivatives							(4.6		)
Interest expense on long term debt							(7.3		)
Net realized and unrealized foreign exchange gains							10.7
Other income							3.2
Other expenses							(1.2		)
Income before tax							$	137.0
Net reserves for loss and loss adjustment expenses	$	2,584.8		$	1,851.0		$	4,435.8
Ratios
Loss ratio	44.8		%	62.9		%	54.7		%
Policy acquisition expense ratio	17.9			17.5			17.7
General and administrative expense ratio	12.8			15.1			17.7			(1)
Expense ratio	30.7			32.6			35.4
Combined ratio	75.5		%	95.5		%	90.1		%

⁽¹⁾  The general and administrative expense ratio in the total column includes corporate expenses.

14

The following tables provide a summary of gross and net written and earned premiums, underwriting results, ratios and reserves for each of the Company’s business segments for the six months ended June 30, 2015 and 2014:

	Six Months Ended June 30, 2015
	Reinsurance			Insurance			Total
	($ in millions)
Underwriting Revenues
Gross written premiums	$	745.5		$	896.5		$	1,642.0
Net written premiums	680.3			727.3			1,407.6
Gross earned premiums	553.0			838.3			1,391.3
Net earned premiums	517.7			685.3			1,203.0
Underwriting Expenses
Losses and loss adjustment expenses	221.8			444.8			666.6
Amortization of deferred policy acquisition costs	103.8			129.6			233.4
General and administrative expenses	67.8			100.5			168.3
Underwriting income	$	124.3		$	10.4		134.7
Corporate expenses							(29.3		)
Net investment income							94.1
Realized and unrealized investment gains							70.9
Realized and unrealized investment losses							(43.3		)
Change in fair value of loan notes issued by variable interest entities							(6.2		)
Change in fair value of derivatives							(5.8		)
Interest expense on long term debt							(14.7		)
Net realized and unrealized foreign exchange (losses)							(18.0		)
Other income							2.7
Other expenses							(0.8		)
Income before tax							$	184.3
Net reserves for loss and loss adjustment expenses	$	2,411.6		$	2,067.0		$	4,478.6
Ratios
Loss ratio	42.8		%	64.9		%	55.4		%
Policy acquisition expense ratio	20.1			18.9			19.4
General and administrative expense ratio	13.1			14.7			16.4			(1)
Expense ratio	33.2			33.6			35.8
Combined ratio	76.0		%	98.5		%	91.2		%

⁽¹⁾  The general and administrative expense ratio in the total column includes corporate expenses.

15

	Six Months Ended June 30, 2014
	Reinsurance			Insurance			Total
	( $ in millions)
Underwriting Revenues
Gross written premiums	$	770.6		$	864.2		$	1,634.8
Net written premiums	729.5			654.4			1,383.9
Gross earned premiums	568.2			778.1			1,346.3
Net earned premiums	545.5			637.2			1,182.7
Underwriting Expenses
Losses and loss adjustment expenses	235.4			389.8			625.2
Amortization of deferred policy acquisition costs	100.2			120.7			220.9
General and administrative expenses	68.6			97.0			165.6
Underwriting income	$	141.3		$	29.7		171.0
Corporate expenses							(38.8		)
Net investment income							95.6
Realized and unrealized investment gains							52.5
Realized and unrealized investment losses							(7.6		)
Change in fair value of loan notes issued by variable interest entities							(6.0		)
Change in fair value of derivatives							(3.5		)
Interest expense on long term debt							(14.7		)
Net realized and unrealized foreign exchange gains							10.8
Other income							3.8
Other expenses							(1.9		)
Income before tax							$	261.2
Net reserves for loss and loss adjustment expenses	$	2,584.8		$	1,851.0		$	4,435.8
Ratios
Loss ratio	43.2		%	61.2		%	52.9		%
Policy acquisition expense ratio	18.4			18.9			18.7
General and administrative expense ratio	12.6			15.2			17.3			(1)
Expense ratio	31.0			34.1			36.0
Combined ratio	74.2		%	95.3		%	88.9		%

⁽¹⁾  The general and administrative expense ratio in the total column includes corporate expenses.

16

6.     Investments

Income Statement

Investment Income. The following table summarizes investment income for the three and six months ended June 30, 2015 and 2014:

	For the Three Months Ended						For the Six Months Ended
	June 30, 2015			June 30, 2014			June 30, 2015			June 30, 2014
	($ in millions)						($ in millions)
Fixed income securities — Available for sale	$	35.5		$	37.3		$	70.7		$	75.8
Fixed income securities — Trading	6.9			6.6			13.9			13.2
Short-term investments — Available for sale	0.2			0.3			0.6			0.6
Fixed term deposits (included in cash and cash equivalents)	0.9			1.1			2.0			1.9
Equity securities — Available for sale	0.1			1.0			0.1			2.5
Equity securities — Trading	5.7			3.1			11.9			7.0
Catastrophe bonds — Trading	0.5			0.2			0.9			0.4
Total	$	49.8		$	49.6		$	100.1		$	101.4
Investment expenses	(3.1		)	(3.5		)	(6.0		)	(5.8		)
Net investment income	$	46.7		$	46.1		$	94.1		$	95.6

The following table summarizes the net realized and unrealized investment gains and losses recorded in the statement of operations and the change in unrealized gains and losses on investments recorded in other comprehensive income for the three and six months ended June 30, 2015 and 2014:

	For the Three Months Ended						For the Six Months Ended
	June 30, 2015			June 30, 2014			June 30, 2015			June 30, 2014
	($ in millions)						($ in millions)
Available for sale:
Fixed income securities — gross realized gains	$	1.1		$	2.0		$	7.3		$	6.4
Fixed income securities — gross realized (losses)	(0.6		)	(1.4		)	(1.1		)	(4.5		)
Equity securities — gross realized gains	—			4.2			31.9			5.5
Equity securities — gross realized (losses)	—			—			(3.0		)	—
Other-than-temporary impairments	—			(0.7		)	—			(0.7		)
Trading:
Fixed income securities — gross realized gains	1.3			2.8			3.3			4.7
Fixed income securities — gross realized (losses)	(0.4		)	(1.0		)	(2.6		)	(2.2		)
Equity securities — gross realized gains	11.9			0.7			28.4			1.7
Equity securities — gross realized (losses)	(4.3		)	(0.2		)	(13.1		)	(0.2		)
Catastrophe bonds	(0.8		)	(0.1		)	(0.8		)	—
Net change in gross unrealized gains	(23.5		)	25.0			(22.7		)	34.2
Total net realized and unrealized investment gains recorded in the statement of operations	$	(15.3	)	$	31.3		$	27.6		$	44.9
Change in available for sale net unrealized gains (losses):
Fixed income securities	(77.4		)	31.4			(50.1		)	53.5
Short-term investments	(0.1		)	—			—			—
Equity securities	(0.1		)	1.7			(27.4		)	2.2
Total change in pre-tax available for sale unrealized gains	(77.6		)	33.1			(77.5		)	55.7
Change in taxes	4.2			(3.6		)	1.3			(5.9		)
Total change in net unrealized (losses) gains, net of taxes, recorded in other comprehensive income	$	(73.4	)	$	29.5		$	(76.2	)	$	49.8

17

Other-than-temporary Impairments. A security is potentially impaired when its fair value is below its amortized cost. The Company reviews its available for sale fixed income and equity portfolios on an individual security basis for potential other-than-temporary impairment (“OTTI”) each quarter based on criteria including issuer-specific circumstances, credit ratings actions and general macro-economic conditions. For a more detailed description of OTTI, please refer to Note 2(c) of the “Notes to the Audited Consolidated Financial Statements” in the Company’s 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission. There was no OTTI charge recognized for the three and six months ended June 30, 2015 (2014 — $0.7 million and $0.7 million, respectively).

Balance Sheet

Fixed Income Securities, Short-Term Investments and Equities — Available For Sale. The following tables present the cost or amortized cost, gross unrealized gains and losses and estimated fair market value of available for sale investments in fixed income securities, short-term investments and equity securities as at June 30, 2015 and December 31, 2014:

	As at June 30, 2015
	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	($ in millions)
U.S. government	$	1,056.2	$	19.5	$	(1.1	)	$	1,074.6
U.S. agency	175.8		6.3		(0.1		)	182.0
Municipal	27.8		1.7		—			29.5
Corporate	2,373.3		59.6		(12.1		)	2,420.8
Non-U.S. government-backed corporate	77.5		0.9		(0.1		)	78.3
Foreign government	650.3		12.5		(1.1		)	661.7
Asset-backed	136.6		2.1		—			138.7
Non-agency commercial mortgage-backed	33.4		2.2		—			35.6
Agency mortgage-backed	981.9		32.1		(5.5		)	1,008.5
Total fixed income securities — Available for sale	5,512.8		136.9		(20.0		)	5,629.7
Total short-term investments — Available for sale	184.0		0.1		—			184.1
Total	$	5,696.8	$	137.0	$	(20.0	)	$	5,813.8

18

	As at December 31, 2014
	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	($ in millions)
U.S. government	$	1,074.2	$	21.5	$	(1.3	)	$	1,094.4
U.S. agency	190.0		7.5		(0.1		)	197.4
Municipal	29.1		2.4		—			31.5
Corporate	2,244.7		79.9		(5.2		)	2,319.4
Non-U.S. government-backed corporate	76.8		1.2		—			78.0
Foreign government	648.6		17.3		(0.2		)	665.7
Asset-backed	141.3		2.4		(0.2		)	143.5
Non-agency commercial mortgage-backed	41.5		3.3		—			44.8
Agency mortgage-backed	1,016.7		40.8		(2.2		)	1,055.3
Total fixed income securities — Available for sale	5,462.9		176.3		(9.2		)	5,630.0
Total short-term investments — Available for sale	258.2		0.1		—			258.3
Total equity securities — Available for sale	82.6		27.3		—			109.9
Total	$	5,803.7	$	203.7	$	(9.2	)	$	5,998.2

Fixed Income Securities, Short-Term Investments, Equities and Catastrophe Bonds — Trading. The following tables present the cost or amortized cost, gross unrealized gains and losses, and estimated fair market value of trading investments in fixed income securities, short-term investments, equity securities and catastrophe bonds as at June 30, 2015 and December 31, 2014:

	As at June 30, 2015
	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	($ in millions)
U.S. government	$	3.4	$	—	$	—		$	3.4
Municipal	0.5		—		—			0.5
Corporate	535.9		8.7		(4.5		)	540.1
Foreign government	131.4		3.3		(0.9		)	133.8
Asset-backed	19.6		0.1		—			19.7
Bank loans	80.6		0.2		(0.6		)	80.2
Total fixed income securities — Trading	771.4		12.3		(6.0		)	777.7
Total short-term investments — Trading	1.1		—		—			1.1
Total equity securities — Trading	717.5		48.6		(36.8		)	729.3
Total catastrophe bonds — Trading	32.6		—		(0.3		)	32.3
Total	$	1,522.6	$	60.9	$	(43.1	)	$	1,540.4

19

	As at December 31, 2014
	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	($ in millions)
U.S. agency	$	0.2	$	—	$	—		$	0.2
Municipal	1.1		—		—			1.1
Corporate	520.9		11.7		(2.8		)	529.8
Foreign government	137.3		4.3		(1.5		)	140.1
Asset-backed	14.6		0.1		—			14.7
Bank loans	86.8		—		(1.7		)	85.1
Total fixed income securities — Trading	760.9		16.1		(6.0		)	771.0
Total short-term investments — Trading	0.2		—		—			0.2
Total equity securities — Trading	585.2		55.5		(24.7		)	616.0
Total catastrophe bonds — Trading	34.4		0.4		—			34.8
Total	$	1,380.7	$	72.0	$	(30.7	)	$	1,422.0

The Company classifies these financial instruments as held for trading as this most closely reflects the facts and circumstances of the investments held.

Catastrophe Bonds. The Company has invested in catastrophe bonds with a total value of $32.3 million as of June 30, 2015.  The bonds receive quarterly interest payments based on variable interest rates with scheduled maturities ranging from 2016 to 2020.  The redemption value of the bonds will adjust based on the occurrence of a covered event, such as windstorms and earthquakes which occur in the United States, Canada, the North Atlantic, Japan or Australia.

Other Investments. In January 2015, the Company established, along with seven other insurance companies, a micro-insurance venture consortium and micro-insurance incubator (“MVI”), domiciled in Bermuda. The MVI is a social impact organization that will provide micro-insurance products to assist global emerging consumers. The Company's initial investment in the MVI was $0.8 million.

On October 2, 2012, the Company established a subsidiary, Aspen Recoveries Limited, to take ownership of a 58.5% shareholding in Chaspark Maritime Holdings Ltd., a Singaporean registered company (“Chaspark”), with the remaining shareholding owned by other insurers. The shareholding in Chaspark was received as a settlement for subrogation rights associated with a contract frustration claim settlement. The Company has determined that Chaspark has the characteristics of a variable interest entity as addressed by the guidance in ASC 810-10, Consolidation. However, having considered the provisions of ASC 810-10, the Company’s investment in Chaspark does not permit the Company to direct the activities which most significantly impact Chaspark’s economic performance and the Company is not acting as principal or agent for a related party group of investors. Under these circumstances, the Company is not required to consolidate Chaspark. The investment is therefore accounted for under the equity method and adjustments to the carrying value of this investment are made based on the Company’s share of capital including share of income and expenses, which is provided in the quarterly management accounts. The adjusted carrying value approximates fair value.

The tables below show the Company’s investments in the MVI and Chaspark for the three and six months ended June 30, 2015:

	For the Three Months Ended June 30, 2015
	MVI		Chaspark		Total
	($ in millions)
Opening and closing undistributed value of investment	$	0.8	$	8.7	$	9.5

	For the Six Months Ended June 30, 2015
	MVI		Chaspark		Total
	($ in millions)
Opening undistributed value of investment as at January 1, 2015	$	—	$	8.7	$	8.7
Initial investment	0.8		—		$	0.8
Closing value of investment as at June 30, 2015	$	0.8	$	8.7	$	9.5

20

Fixed Income Securities. The scheduled maturity distribution of available for sale fixed income securities as at June 30, 2015 and December 31, 2014 is set forth below. Actual maturities may differ from contractual maturities because issuers of securities may have the right to call or prepay obligations with or without call or prepayment penalties.

	As at June 30, 2015
	Amortized Cost or Cost		Fair Market Value		Average S&P Ratings by Maturity
	($ in millions)
Due one year or less	$	632.9	$	638.4	AA
Due after one year through five years	2,575.0		2,636.3		AA-
Due after five years through ten years	1,064.3		1,077.3		A+
Due after ten years	88.7		94.9		A+
Subtotal	4,360.9		4,446.9
Non-agency commercial mortgage-backed	33.4		35.6		AA+
Agency mortgage-backed	981.9		1,008.5		AA+
Asset-backed	136.6		138.7		AAA
Total fixed income securities — Available for sale	$	5,512.8	$	5,629.7

	As at December 31, 2014
	Amortized Cost or Cost		Fair Market Value		Average S&P Ratings by Maturity
	($ in millions)
Due one year or less	$	590.2	$	594.7	AA
Due after one year through five years	2,552.0		2,620.8		AA-
Due after five years through ten years	1,023.5		1,059.9		A+
Due after ten years	97.7		111.0		A+
Subtotal	4,263.4		4,386.4
Non-agency commercial mortgage-backed	41.5		44.8		AA+
Agency mortgage-backed	1,016.7		1,055.3		AA+
Asset-backed	141.3		143.5		AAA
Total fixed income securities — Available for sale	$	5,462.9	$	5,630.0

Guaranteed Investments. As at June 30, 2015, the Company held $2.4 million (December 31, 2014 — $2.5 million) in investments which are guaranteed by mono-line insurers, excluding those with explicit government guarantees, and the Company’s holding was limited to two municipal securities, rated A3 and Caa3 (December 31, 2014 — two municipal securities, rated A3 and Caa3). The standalone rating (rating without guarantee) is determined as the senior unsecured debt rating of the issuer. Where the credit ratings were split between the two main rating agencies, Standard & Poor’s Financial Services LLC (“S&P”) and Moody’s Investors Service, Inc. (“Moody’s”), the lowest rating was used. The Company’s exposure to other third-party guaranteed debt is primarily to investments backed by non-U.S. government guaranteed issuers.

21

Gross Unrealized Loss. The following tables summarize as at June 30, 2015 and December 31, 2014 by type of security, the aggregate fair value and gross unrealized loss by length of time the security has been in an unrealized loss position for the Company’s available for sale portfolio:

	As at June 30, 2015
	0-12 months					Over 12 months					Total
	Fair Market Value		Gross Unrealized Loss			Fair Market Value		Gross Unrealized Loss			Fair Market Value		Gross Unrealized Loss			Number of Securities
	($ in millions)
U.S. government	$	125.8	$	(1.0	)	$	40.6	$	(0.1	)	$	166.4	$	(1.1	)	28
U.S. agency	3.9		(0.1		)	5.0		—			8.9		(0.1		)	4
Municipal	1.9		—			—		—			1.9		—			3
Corporate	829.2		(10.6		)	75.0		(1.5		)	904.2		(12.1		)	332
Non-U.S. government-backed corporate	10.3		(0.1		)	—		—			10.3		(0.1		)	5
Foreign government	150.9		(1.0		)	3.7		(0.1		)	154.6		(1.1		)	23
Asset-backed	29.6		—			12.1		—			41.7		—			30
Agency mortgage-backed	235.0		(3.5		)	67.9		(2.0		)	302.9		(5.5		)	78
Total fixed income securities — Available for sale	1,386.6		(16.3		)	204.3		(3.7		)	1,590.9		(20.0		)	503
Total short-term investments — Available for sale	54.6		—			—		—			54.6		—			10
Total	$	1,441.2	$	(16.3	)	$	204.3	$	(3.7	)	$	1,645.5	$	(20.0	)	513

	As at December 31, 2014
	0-12 months					Over 12 months					Total
	Fair Market Value		Gross Unrealized Loss			Fair Market Value		Gross Unrealized Loss			Fair Market Value		Gross Unrealized Loss			Number of Securities
	($ in millions)
U.S. government	$	166.1	$	(0.5	)	$	79.4	$	(0.8	)	$	245.5	$	(1.3	)	39
U.S. agency	25.1		—			4.9		(0.1		)	30.0		(0.1		)	7
Municipal	—		—			—		—			—		—			0
Corporate	459.4		(2.1		)	171.3		(3.1		)	630.7		(5.2		)	274
Non-U.S. government-backed corporate	0.7		—			—		—			0.7		—			1
Foreign government	30.4		—			44.2		(0.2		)	74.6		(0.2		)	16
Asset-backed	43.7		(0.1		)	11.7		(0.1		)	55.4		(0.2		)	43
Agency mortgage-backed	64.7		(0.3		)	111.7		(1.9		)	176.4		(2.2		)	48
Total fixed income securities — Available for sale	790.1		(3.0		)	423.2		(6.2		)	1,213.3		(9.2		)	428
Total short-term investments — Available for sale	4.6		—			—		—			4.6		—			3
Total	$	794.7	$	(3.0	)	$	423.2	$	(6.2	)	$	1,217.9	$	(9.2	)	431

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Investment Purchases and Sales. The following table summarizes investment purchases, sales and maturities for the three and six months ended June 30, 2015 and 2014:

	For the Three Months Ended						For the Six Months Ended
	June 30, 2015			June 30, 2014			June 30, 2015			June 30, 2014
	($ in millions)						($ in millions)
(Purchases) of fixed income securities — Available for sale	$	(455.6	)	$	(380.9	)	$	(939.3	)	$	(918.1	)
(Purchases) of fixed income securities — Trading	(122.1		)	(206.8		)	(275.5		)	(398.9		)
(Purchases) of equity securities — Trading	(82.2		)	(67.1		)	(268.9		)	(118.9		)
Proceeds from sales and maturities of fixed income securities — Available for sale	320.8			417.1			861.5			1,015.9
Proceeds from sales and maturities of fixed income securities — Trading	130.7			190.9			264.5			372.2
Proceeds from sales of equity securities — Available for sale	—			11.6			108.6			15.6
Proceeds from sales of equity securities — Trading	67.4			12.9			151.1			18.2
Net change in (payable)/receivable for securities (purchased)/sold	(10.1		)	6.2			5.8			19.8
(Purchases) of short-term investments — Available for sale	(47.2		)	(137.6		)	(109.3		)	(268.9		)
Sale of short-term investments — Available for sale	49.0			23.5			172.4			92.9
(Purchases) of short-term investments — Trading	(2.9		)	(70.2		)	(15.7		)	(80.2		)
Sale of short-term investments — Trading	2.5			56.2			14.8			66.2
Net proceeds/(purchases) of catastrophe bonds — Trading	—			(12.2		)	1.8			(24.3		)
Proceeds from other investments	—			—			—			37.3
Net (purchases) for the period	$	(149.7	)	$	(156.4	)	$	(28.2	)	$	(171.2	)

7. Variable Interest Entities

As at June 30, 2015, the Company had two investments in two variable interest entities (“VIE”), Chaspark and Silverton.

Chaspark. On October 2, 2012, the Company established a subsidiary, Aspen Recoveries Limited, to take ownership of a 58.5% shareholding in Chaspark, with the remaining shareholding owned by other insurers. The shareholding in Chaspark was received as a settlement for subrogation rights associated with a contract frustration claim settlement. The Company has determined that Chaspark has the characteristics of a VIE as addressed by the guidance in ASC 810, Consolidation. As discussed further in Note 6 of these unaudited condensed consolidated financial statements, the investment in Chaspark is accounted for under the equity method. In the three and six months ended June 30, 2015, there was no change in the value of the Company’s investment in Chaspark (June 30, 2014 — $Nil and $Nil). The adjusted carrying value approximates fair value.

Silverton. On September 10, 2013, the Company established Silverton, a Bermuda domiciled special purpose insurerformed to provide additional collateralized capacity to support Aspen Re’s business through retrocession agreements which are collateralized and funded by Silverton through the issuance of a series of loan notes. Silverton is a non-rated insurer and the risks are fully collateralized by way of funds held in trust for the benefit of Aspen Bermuda.

The proceeds of $65.0 million (of which $50.0 million was issued to third parties) from the issuance of Silverton’s Series 2014-1 Participating Notes on December 27, 2013 (“2014 Loan Notes”) were deposited into a collateral account to fund Silverton’s obligations under a retrocession property quota share agreement entered into with Aspen Bermuda effective January 1, 2014. The holders of the 2014 Loan Notes participate in any profit or loss generated by Silverton attributable to the operations of Silverton’s Series 2014-1 Segregated Account. Any existing value of the 2014 Loan Notes is being returned to the noteholders in installments after the expiration of the risk period of the retrocession agreement issued by Silverton for the related series with the final payment being contractually due on the September 16, 2016 maturity date. The fair value of the 2014 Loan Notes as at June 30, 2015 was $2.1 million (of which $1.6 million was due to external investors). During the first half of 2015, Silverton distributed $87.0 million (of which $67.0 million was distributed to external investors) to its noteholders. Of the remaining $1.6 million due to external investors, $1.6 million has been classified as a current liability in the Company’s consolidated financial statements. The total aggregate unpaid balance of the 2014 Loan Notes held by third parties and those held by Aspen Holdings is $2.1 million. The Company’s maximum loss exposure to the 2014 Loan Notes is $0.5 million which is the fair value of its holdings as at June 30, 2015.

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The proceeds of $85.0 million (of which $70.0 million was issued to third parties) from the issuance of Silverton’s Series 2015-1 Participating Notes on December 23, 2014 (“2015 Loan Notes”) were deposited into a collateral account to fund Silverton’s obligations under a retrocession property quota share agreement entered into with Aspen Bermuda effective January 1, 2015. The holders of the 2015 Loan Notes participate in any profit or loss generated by Silverton attributable to the operations of Silverton’s Series 2015-1 Segregated Account. Any existing value of the 2015 Loan Notes will be returned to the noteholders after the expiration of the risk period of the retrocession agreement issued by Silverton for the related series with the final payment being contractually due on the September 18, 2017 maturity date. The fair value of the 2015 Loan Notes as at June 30, 2015 was $92.6 million (of which $76.2 million was held by external investors). The $76.2 million of the 2015 Loan Notes held by external investors is classified as long-term debt in the Company’s consolidated financial statements. The total aggregate unpaid balance of the 2015 Loan Notes held by third parties and those held by Aspen Holdings is $92.6 million. The Company’s maximum loss exposure to the 2015 Loan Notes is $16.3 million which is the fair value of its holdings as at June 30, 2015.

The Company has determined that Silverton has the characteristics of a VIE that are addressed by the guidance in ASC 810, Consolidation. The Company concluded that it is the primary beneficiary and has consolidated the subsidiary upon its formation as it owns 100% of the voting shares, 100% of the issued share capital and has a significant financial interest and the power to control Silverton. The Company has no other obligation to provide financial support to Silverton. Neither the creditors nor beneficial interest holders of Silverton have recourse to the Company’s general credit.

In the event of either an extreme catastrophic property reinsurance event or severe credit-related event there is a risk that Aspen Bermuda would be unable to recover losses from Silverton. These two risks are mitigated as follows:

i. Silverton has collateralized the aggregate limit provided to Aspen Bermuda by way of a trust in favor of Aspen Bermuda as the beneficiary;

ii. the trustee is a large, well-established regulated entity; and

iii. all funds within the trust account are bound by investment guidelines restricting investments to one of the institutional class money market funds run by large international investment managers.

For further information regarding the loan notes attributable to the third-party investments in Silverton, refer to Note 8 of these unaudited condensed consolidated financial statements.

8. Fair Value Measurements

The Company’s estimates of fair value for financial assets and liabilities are based on the framework established in the fair value accounting guidance included in ASC 820, Fair Value Measurements and Disclosures. The framework prioritizes the inputs, which refer broadly to assumptions market participants would use in pricing an asset or liability, into three levels.

The Company considers prices for actively traded securities to be derived based on quoted prices in an active market for identical assets, which are Level 1 inputs in the fair value hierarchy. The majority of these securities are valued using prices supplied by index providers.

The Company considers prices for other securities that may not be as actively traded which are priced via pricing services, index providers, vendors and broker-dealers, or with reference to interest rates and yield curves, to be derived based on inputs that are observable for the asset, either directly or indirectly, which are Level 2 inputs in the fair value hierarchy. The majority of these securities are also valued using prices supplied by index providers.

The Company considers securities, other financial instruments and derivative insurance contracts subject to fair value measurement whose valuation is derived by internal valuation models to be based largely on unobservable inputs, which are Level 3 inputs in the fair value hierarchy.

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The following tables present the level within the fair value hierarchy at which the Company’s financial assets and liabilities are measured on a recurring basis as at June 30, 2015 and December 31, 2014, respectively:

	As at June 30, 2015
	Level 1		Level 2			Level 3			Total
	($ in millions)
Available for sale financial assets, at fair value
U.S. government	$	1,074.6	$	—		$	—		$	1,074.6
U.S. agency	—		182.0			—			182.0
Municipal	—		29.5			—			29.5
Corporate	—		2,420.8			—			2,420.8
Non-U.S. government-backed corporate	—		78.3			—			78.3
Foreign government	479.6		182.1			—			661.7
Asset-backed	—		138.7			—			138.7
Non-agency commercial mortgage-backed	—		35.6			—			35.6
Agency mortgage-backed	—		1,008.5			—			1,008.5
Total fixed income securities available for sale, at fair value	1,554.2		4,075.5			—			5,629.7
Short-term investments available for sale, at fair value	—		184.1			—			184.1
Held for trading financial assets, at fair value
U.S. government	3.4		—			—			3.4
Municipal	—		0.5			—			0.5
Corporate	—		540.1			—			540.1
Foreign government	41.3		92.5			—			133.8
Asset-backed	—		19.7			—			19.7
Bank loans	—		80.2			—			80.2
Total fixed income securities trading, at fair value	44.7		733.0			—			777.7
Short-term investments trading, at fair value	—		1.1			—			1.1
Equity investments trading, at fair value	729.3		—			—			729.3
Catastrophe bonds trading, at fair value	—		32.3			—			32.3
Other financial assets and liabilities, at fair value
Derivatives at fair value — foreign exchange contracts	—		4.1			—			4.1
Liabilities under derivative contracts — interest rate swaps	—		(1.0		)	—			(1.0		)
Liabilities under derivative contracts — foreign exchange contracts	—		(6.2		)	—			(6.2		)
Loan notes issued by variable interest entities, at fair value	—		—			(76.2		)	(76.2		)
Loan notes issued by variable interest entities, at fair value (classified as a current liability)	—		—			(1.6		)	(1.6		)
Total	$	2,328.2	$	5,022.9		$	(77.8	)	$	7,273.3

There were no maturities or transfers between Level 1, Level 2 and Level 3 during the three and six months ended June 30, 2015. The Company settled $2.2 million and $67.0 million Level 3 liabilities in respect to the loan notes issued by the VIEs for the three and six months ended June 30, 2015. As at at June 30, 2015, there were no assets classified as Level 3 and the Company's Level 3 liabilities consisted of the loan notes issued by the VIEs.

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	As at December 31, 2014
	Level 1		Level 2			Level 3			Total
	($ in millions)
Available for sale financial assets, at fair value
U.S. government	$	1,094.4	$	—		$	—		$	1,094.4
U.S. agency	—		197.4			—			197.4
Municipal	—		31.5			—			31.5
Corporate	—		2,319.4			—			2,319.4
Non-U.S. government-backed corporate	—		78.0			—			78.0
Foreign government	456.5		209.2			—			665.7
Asset-backed	—		143.5			—			143.5
Non-agency commercial mortgage-backed	—		44.8			—			44.8
Agency mortgage-backed	—		1,055.3			—			1,055.3
Total fixed income securities available for sale, at fair value	1,550.9		4,079.1			—			5,630.0
Short-term investments available for sale, at fair value	229.3		29.0			—			258.3
Equity investments available for sale, at fair value	109.9		—			—			109.9
Held for trading financial assets, at fair value
U.S. government	—		—			—			—
U.S. agency	—		0.2			—			0.2
Municipal	—		1.1			—			1.1
Corporate	—		529.8			—			529.8
Foreign government	36.1		104.0			—			140.1
Asset-backed	—		14.7			—			14.7
Bank loans	—		85.1			—			85.1
Catastrophe bonds trading, at fair value	—		34.8			—			34.8
Total fixed income securities trading, at fair value	36.1		769.7			—			805.8
Short-term investments trading, at fair value	0.1		0.1			—			0.2
Equity investments trading, at fair value	616.0		—			—			616.0
Other financial assets and liabilities, at fair value
Derivatives at fair value – foreign exchange contracts	—		7.9			—			7.9
Derivatives at fair value – interest rate swaps	—		0.1			—			0.1
Liabilities under derivative contracts – foreign exchange contracts	—		(14.3		)	—			(14.3		)
Loan notes issued by variable interest entities, at fair value	—		—			(70.7		)	(70.7		)
Loan notes issued by variable interest entities, at fair value (classified as a current liability)	—		—			(67.9		)	(67.9		)
Total	$	2,542.3	$	4,871.6		$	(138.6	)	$	7,275.3

There were no maturities, settlements or transfers between Level 1, Level 2 and Level 3 during the twelve months ended December 31, 2014. There were no assets or liabilities that were classified as Level 3 as at December 31, 2014, except for the loan notes issued by the VIEs.

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The following tables present a reconciliation of the beginning and ending balances for all assets and liabilities measured at fair value on a recurring basis using Level 3 inputs for the three and six months ended June 30, 2015 and 2014:

Reconciliation of Liabilities Using Level 3 Inputs	Three Months Ended June 30, 2015			Three Months Ended June 30, 2014
	($ in millions)
Balance at the beginning of the period (1)	$	76.7		$	53.4
Distributed to third party	(2.2		)	—
Total change in fair value included in the statement of operations	3.3			2.6
Balance at the end of the period (1)	$	77.8		$	56.0

Reconciliation of Liabilities Using Level 3 Inputs	Six Months Ended June 30, 2015			Six Months Ended June 30, 2014
	($ in millions)
Balance at the beginning of the period (1)	$	138.6		$	50.0
Distributed to third party	(67.0		)	—
Total change in fair value included in the statement of operations	6.2			6.0
Balance at the end of the period (1)	$	77.8		$	56.0

⁽¹⁾ The amount classified as other payables was $1.6 million and $67.9 million as at June 30, 2015 and December 31, 2014, respectively.

Valuation of Fixed Income Securities. The Company’s fixed income securities are classified as either available for sale or trading and carried at fair value. As at June 30, 2015 and December 31, 2014, the Company’s fixed income securities were valued by pricing services, index providers or broker-dealers using standard market conventions. The market conventions utilize market quotations, market transactions in comparable instruments and various relationships between instruments including, but not limited to, yield to maturity, dollar prices and spread prices in determining value.

Independent Pricing Services and Index Providers. The underlying methodology used to determine the fair value of securities in the Company’s available for sale and trading portfolios by the pricing services and index providers the Company uses is very similar. Pricing services will gather observable pricing inputs from multiple external sources, including buy and sell-side contacts and broker-dealers, in order to develop their internal prices. Index providers are those firms which provide prices for a range of securities within one or more asset classes, typically using their own in-house market makers (traders) as the primary pricing source for the indices, although ultimate valuations may also rely on other observable data inputs to derive a dollar price for all index-eligible securities. Index providers without in-house trading desks will function similarly to a pricing service in that they will gather their observable pricing inputs from multiple external sources. All prices for the Company’s securities attributed to index providers are for an individual security within the respective indices.

Pricing services and index providers provide pricing for less complex, liquid securities based on market quotations in active markets. Pricing services and index providers supply prices for a broad range of securities including those for actively traded securities, such as Treasury and other Government securities, in addition to those that trade less frequently or where valuation includes reference to credit spreads, pay down and pre-pay features and other observable inputs. These securities include Government Agency, Municipals, Corporate and Asset-Backed Securities.

For securities that may trade less frequently or do not trade on a listed exchange, these pricing services and index providers may use matrix pricing consisting of observable market inputs to estimate the fair value of a security. These observable market inputs include: reported trades, benchmark yields, broker-dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, reference data, and industry and economic factors. Additionally, pricing services and index providers may use a valuation model such as an option adjusted spread model commonly used for estimating fair values of mortgage-backed and asset-backed securities. Neither the Company, nor its index providers, derives dollar prices using an index as a pricing input for any individual security.

Broker-Dealers. The Company obtains quotes from broker-dealers who are active in the corresponding markets when prices are unavailable from independent pricing services or index providers. Generally, broker-dealers value securities through their trading desks based on observable market inputs. Their pricing methodologies include mapping securities based on trade data, bids or offers, observed spreads and performance of newly issued securities. They may also establish pricing through observing secondary trading of similar securities. Quotes from broker-dealers are non-binding.

The Company obtains prices for all of its fixed income investment securities via its third-party accounting service provider, and in the majority of cases receiving a number of quotes so as to obtain the most comprehensive information

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available to determine a security’s fair value. A single valuation is applied to each security based on the vendor hierarchy maintained by the Company’s third-party accounting service provider.

As at June 30, 2015, the Company obtained an average of 2.0 quotes per fixed income investment, consistent with 2.0 quotes as at December 31, 2014. Pricing sources used in pricing fixed income investments as at June 30, 2015 and December 31, 2014 were as follows:

	As at June 30, 2015		As at December 31, 2014
Index providers	83	%	84	%
Pricing services	12		11
Broker-dealers	5		5
Total	100	%	100	%

A summary of securities priced using pricing information from index providers as at June 30, 2015 and December 31, 2014 is provided below:

	As at June 30, 2015				As at December 31, 2014
	Fair Market Value Determined using Prices from Index Providers		% of Total Fair Value by Security Type		Fair Market Value Determined using Prices from Index Providers		% of Total Fair Value by Security Type
	($ in millions, except for percentages)
U.S. government	$	1,040.5	97	%	$	1,044.4	95	%
U.S. agency	171.7		94	%	186.9		95	%
Municipal	12.5		42	%	13.7		42	%
Corporate	2,828.1		96	%	2,731.1		96	%
Non-U.S. government-backed corporate	35.9		46	%	48.7		62	%
Foreign government	460.9		58	%	504.4		63	%
Asset-backed	138.9		88	%	140.5		89	%
Non-agency commercial mortgage-backed	35.6		100	%	44.8		100	%
Agency mortgage-backed	624.3		62	%	680.6		64	%
Total fixed income securities	$	5,348.4	83	%	$	5,395.1	84	%
Equities	729.3		100	%	725.9		100	%
Total fixed income securities and equity investments	$	6,077.7	85	%	$	6,121.0	86	%

The Company, in conjunction with its third-party accounting service provider, obtains an understanding of the methods, models and inputs used by the third-party pricing service and index provider to assess the ongoing appropriateness of vendors’ prices. The Company and its third-party accounting service provider also have controls in place to validate that amounts provided represent fair values. Processes to validate and review pricing include, but are not limited to:

• quantitative analysis (e.g., comparing the quarterly return for each managed portfolio to its target benchmark, with significant differences identified and investigated);

• comparison of market values obtained from pricing services, index providers and broker-dealers against alternative price sources for each security where further investigation is completed when significant differences exist for pricing of individual securities between pricing sources;

• initial and ongoing evaluation of methodologies used by outside parties to calculate fair value; and

• comparison of the fair value estimates to the Company’s knowledge of the current market.

Prices obtained from pricing services, index providers and broker-dealers are not adjusted by us; however, prices provided by a pricing service, index provider or broker-dealer in certain instances may be challenged based on market or information available from internal sources, including those available to the Company’s third-party investment accounting service provider. Subsequent to any challenge, revisions made by the pricing service, index provider or broker-dealer to the quotes are supplied to the Company’s investment accounting service provider.

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Management reviews the vendor hierarchy maintained by the Company’s third-party accounting service provider in order to determine which price source provides the most appropriate fair value (i.e., a price obtained from a pricing service with more seniority in the hierarchy will be used over a less senior one in all cases). The hierarchy level assigned to each security in the Company’s available for sale and trading portfolios is based upon its assessment of the transparency and reliability of the inputs used in the valuation as of the measurement date. The hierarchy of index providers and pricing services is determined using various qualitative and quantitative points arising from reviews of the vendors conducted by the Company’s third-party accounting service provider. Vendor reviews include annual onsite due diligence meetings with index providers and pricing services vendors covering valuation methodology, operational walkthroughs and legal and compliance updates. Index providers are assigned the highest priority in the pricing hierarchy due primarily to availability and reliability of pricing information.

Fixed Income Securities. The Company’s fixed income securities are traded on the over-the-counter (“OTC”) market based on prices provided by one or more market makers in each security. Securities such as U.S. Government, U.S. Agency, Foreign Government and investment grade corporate bonds have multiple market makers in addition to readily observable market value indicators such as expected credit spread, except for Treasury securities, over the yield curve. The Company uses a variety of pricing sources to value fixed income securities including those securities that have pay down/prepay features such as mortgage-backed securities and asset-backed securities in order to ensure fair and accurate pricing. The fair value estimates for the investment grade securities in the Company’s portfolio do not use significant unobservable inputs or modeling techniques.

U.S. Government and Agency. U.S. government and agency securities consist primarily of bonds issued by the U.S. Treasury and corporate debt issued by agencies such as the Federal National Mortgage Association (“FNMA”), the Federal Home Loan Mortgage Corporation (“FHLMC”) and the Federal Home Loan Bank. As the fair values of U.S. Treasury securities are based on unadjusted market prices in active markets, they are classified within Level 1. The fair values of U.S. government agency securities are priced using the spread above the risk-free yield curve. As the yields for the risk-free yield curve and the spreads for these securities are observable market inputs, the fair values of U.S. government agency securities are classified within Level 2.

Municipals. The Company’s municipal portfolio comprises bonds issued by U.S. domiciled state and municipality entities. The fair value of these securities is determined using spreads obtained from broker-dealers, trade prices and the new issue market which are Level 2 inputs in the fair value hierarchy. Consequently, these securities are classified within Level 2.

Foreign Government. The issuers for securities in this category are non-U.S. governments and their agencies. The fair values of non-U.S. government bonds, primarily sourced from international indices, are based on unadjusted market prices in active markets and are therefore classified within Level 1. The fair values of the non-U.S. agency securities, again primarily sourced from international indices, are priced using the spread above the risk-free yield curve. As the yields for the risk-free yield curve and the spreads for these securities are observable market inputs, the fair values of non-U.S. agency securities are classified within Level 2. In addition, foreign government securities include a portion of the Emerging Market Debt (“EMD”) portfolio which is also classified within Level 2.

Corporate. Corporate securities consist primarily of U.S. and foreign corporations covering a variety of industries and are for the most part priced by index providers and pricing vendors. Some issuers may participate in the FDIC program or other similar non-U.S. government programs which guarantee timely payment of principal and interest in the event of a default. The fair values of these securities are generally determined using the spread above the risk-free yield curve. Inputs used in the evaluation of these securities include credit data, interest rate data, market observations and sector news, broker-dealer quotes and trade volumes. In addition, corporate securities include a portion of the EMD portfolio. The Company classifies all of these securities within Level 2.

Mortgage-backed Securities. The Company’s residential and commercial mortgage-backed securities consist of bonds issued by the Government National Mortgage Association, the FNMA and the FHLMC as well as private non-agency issuers. The fair values of these securities are determined through the use of a pricing model (including Option Adjusted Spread) which uses prepayment speeds and spreads to determine the appropriate average life of the mortgage-backed security. These spreads are generally obtained from broker-dealers, trade prices and the new issue market. As the significant inputs used to price mortgage-backed securities are observable market inputs, these securities are classified within Level 2.

Asset-backed Securities. The underlying collateral for the Company’s asset-backed securities consists mainly of student loans, automobile loans and credit card receivables. These securities are primarily priced by index providers and pricing vendors. Inputs to the valuation process include broker-dealer quotes and other available trade information, prepayment speeds, interest rate data and credit spreads. The Company classifies these securities within Level 2.

Bank Loans. These are variable rate, senior secured debt instruments issued by non-investment grade companies that are not publicly registered but are the most senior debt in a capital structure and are generally secured by company assets. Although these assets are not as liquid a market as traditional fixed income instruments, they are valued in similar fashion to other fixed

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maturities, using similar inputs such as yield curves, interest rates and credit spreads. These securities are primarily priced by a third-party pricing vendor. Bank loans are therefore classified within Level 2.

Short-term Investments. Short-term investments comprise highly liquid debt securities with a maturity greater than three months but less than one year from the date of purchase. Short-term investments are valued in a manner similar to the Company’s fixed maturity investments and are classified within Levels 1 and 2.

Equity Securities. Equity securities include U.S. and foreign common stocks and are classified either as trading or available for sale and carried at fair value. These securities are classified within Level 1 as their fair values are based on quoted market prices in active markets from independent pricing sources. As at June 30, 2015, the Company obtained an average of 4.0 quotes per equity investment, compared to 4.0 quotes as at December 31, 2014. Pricing sources used in pricing equities as at June 30, 2015 and December 31, 2014 were all provided by index providers.

Catastrophe Bonds. Catastrophe bonds held by the Company are variable rate fixed income instruments with redemption values adjusted based on the occurrence of a covered event, usually windstorms and earthquakes.  These bonds have been classified as trading and carried at fair value.  Bonds are priced using an average of multiple broker-dealer quotes and, as such, are classified as Level 2. 

Foreign Exchange Contracts. The foreign exchange contracts which the Company uses to mitigate currency risk are characterized as OTC due to their customized nature and the fact that they do not trade on a major exchange. These instruments trade in a deep liquid market, providing substantial price transparency and accordingly are classified as Level 2.

Interest Rate Swaps. The interest rate swaps which the Company uses to mitigate interest rate risk are also characterized as OTC and are valued by the counterparty using quantitative models with multiple market inputs. The market inputs, such as interest rates and yield curves, are observable and the valuation can be compared for reasonableness with third-party pricing services. Consequently, these instruments are classified as Level 2.

Loan Notes Issued by Variable Interest Entities. Silverton, a licensed special purpose insurer, is consolidated into the Company’s group accounts as a VIE. In the fourth quarter of 2013, Silverton issued $65.0 million ($50.0 million third-party funded) loan notes with a maturity date of September 16, 2016. During the fourth quarter of 2014, Silverton issued an additional $85.0 million ($70.0 million third-party funded) loan notes with a maturity date of September 18, 2017. The Company has elected to account for the loan notes at fair value using the guidance as prescribed under ASC 825, Financial Instruments as the Company believes it represents the most meaningful measurement basis for these liabilities. The loan notes are recorded at fair value at each reporting period and, as they are not quoted on an active market and contain significant unobservable inputs, they have been classified as a Level 3 instrument in the fair value hierarchy. The loan notes are unique because they are linked to the specific risks of the Company’s property catastrophe book.

To determine the fair value of the loan notes, the Company runs an internal model which considers the seasonality of the risk assumed under the retrocessional agreement between Aspen Bermuda and Silverton. The seasonality used in the model is determined by applying the percentage of property catastrophe losses planned by the Company’s actuaries to the estimated written premium to determine earned premium for each quarter. The inputs to the internal valuation model are based on Company specific data due to the lack of availability of observable market inputs. Reserves for losses are the most significant unobservable input. An increase in reserves for losses would normally result in a decrease in the fair value of the loan notes while a decrease in reserves would normally result in an increase in the fair value of the loan notes. The observable and unobservable inputs used to determine the fair value of the 2015 Loan Notes and 2014 Loan Notes as at June 30, 2015 and December 31, 2014 are presented in the table below:

At June 30, 2015		Fair Value Level 3			Valuation Method	Observable (O) and  Unobservable (U) inputs	Low		High
	($ in millions)						($ in millions)
Loan notes held by third parties		$	77.8	(1)	Internal Valuation Model	Gross premiums written (O)	$	37.7	$	39.8
						Reserve for losses (U)	$	3.8	$	3.8
						Contract period (O)	N/A		365 days
						Initial value of issuance (O)	$	120.0	$	120.0

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At December 31, 2014		Fair Value Level 3			Valuation Method	Observable (O) and  Unobservable (U) inputs	Low		High
	($ in millions)						($ in millions)
Loan notes held by third parties		$	138.6	(1)	Internal Valuation Model	Gross premiums written (O)	$	—	$	40.0
						Reserve for losses (U)	$	—	$	4.6
						Contract period (O)	N/A		365 days
						Initial value of issuance (O)	$	120.0	$	120.0

⁽¹⁾ The amount classified as other payables was $1.6 million and $67.9 million as at June 30, 2015 and December 31, 2014, respectively.

The observable and unobservable inputs represent the potential variation around the inputs used in the valuation model. The contract period is defined in the Silverton loan agreements and the initial value represents the funds received from third parties.

9. Reinsurance

The Company purchases retrocession and reinsurance to limit and diversify the Company’s risk exposure and increase its own insurance and reinsurance underwriting capacity. These agreements provide for recovery of a portion of losses and loss adjustment expenses from reinsurers. As is the case with most reinsurance contracts, the Company remains liable to the extent that reinsurers do not meet their obligations under these agreements, and therefore, in line with its risk management objectives, the Company evaluates the financial condition of its reinsurers and monitors concentrations of credit risk. The largest concentrations of reinsurance recoverables as at June 30, 2015 were 21.5% (December 31, 2014  — 18.6%) with Munich Re rated AA- by S&P, 20.0% (December 31, 2014 — 27.3%) with Lloyd’s syndicates rated A+ by S&P and 8.9% (December 31, 2014  — 8.4%) with Arch Re which is rated A+ by S&P.

10. Derivative Contracts

The following tables summarize information on the location and amounts of derivative fair values on the consolidated balance sheet as at June 30, 2015 and December 31, 2014:

		As at June 30, 2015						As at December 31, 2014
Derivatives Not Designated as Hedging Instruments Under ASC 815	Balance Sheet Location	Notional Amount		Fair Value				Notional Amount		Fair Value
		($ in millions)						($ in millions)
Interest Rate Swaps	Liabilities under Derivative Contracts	$	951.3	$	(1.0	)	(1)	$	951.3	$	0.1		(1)
Foreign Exchange Contracts	Derivatives at Fair Value	$	145.0	$	2.0			$	165.8	$	7.9
Foreign Exchange Contracts	Liabilities under Derivative Contracts	$	283.5	$	(6.2	)		$	237.6	$	(10.5	)

⁽¹⁾  Net of $15.9 million of cash collateral provided to counterparties, Goldman Sachs International ($451.3 million notional) and Crédit Agricole CIB ($500.0 million notional) under respective International Swap Dealers Association agreements, as security for the Company’s net liability position (December 31, 2014 — $22.3 million).

		As at June 30, 2015					As at December 31, 2014
Derivatives Designated as Hedging Instruments Under ASC 815	Balance Sheet Location	Notional Amount		Fair Value			Notional Amount		Fair Value
		($ in millions)					($ in millions)
Foreign Exchange Contracts	Liabilities under Derivative Contracts	$	—	$	—		$	135.8	$	(3.8	)	(1)
Foreign Exchange Contracts	Derivatives at Fair Value	$	56.4	$	2.1	(1)	$	—	$	—

⁽¹⁾  Net of $3.2 million cash collateral (December 31, 2014 — $Nil).

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The following tables provide the unrealized and realized gains/(losses) recorded in the statement of operations for the three and six months ended June 30, 2015 and 2014, respectively:

		Amount of Income/(Loss) Recognized in the Statement of Operations and Other Comprehensive Income for the
		Three Months Ended
Derivatives Not Designated as Hedging Instruments Under ASC 815	Location of Income/(Loss) Recognized in the Statement of Operations and Other Comprehensive Income	June 30, 2015			June 30, 2014
		($ in millions)
Foreign Exchange Contracts	Change in Fair Value of Derivatives	$	2.2		$	(1.1	)
Interest Rate Swaps	Change in Fair Value of Derivatives	$	(0.2	)	$	(3.5	)

		Amount of Income/(Loss) Recognized in the Statement of Operations and Other Comprehensive Income for the
		Six Months Ended
Derivatives Not Designated as Hedging Instruments Under ASC 815	Location of Income/(Loss) Recognized in the Statement of Operations and Other Comprehensive Income	June 30, 2015			June 30, 2014
		($ in millions)
Foreign Exchange Contracts	Change in Fair Value of Derivatives	$	(2.4	)	$	1.9
Interest Rate Swaps	Change in Fair Value of Derivatives	$	(3.4	)	$	(5.4	)

		Amount of Income Recognized in the Statement of Operations and Other Comprehensive Income for the
		Three Months Ended
Derivatives Designated as Hedging Instruments Under ASC 815	Location of Income Recognized in the Statement of Operations and Other Comprehensive Income	June 30, 2015		June 30, 2014
		($ in millions)
Foreign Exchange Contracts	General, administrative and corporate expenses	$	0.1	$	—
Foreign Exchange Contracts	Net change from current period hedged transactions	$	5.1	$	—

		Amount of Income/(Loss) Recognized in the Statement of Operations and Other Comprehensive Income for the
		Six Months Ended
Derivatives Designated as Hedging Instruments Under ASC 815	Location of Income/(Loss) Recognized in the Statement of Operations and Other Comprehensive Income	June 30, 2015			June 30, 2014
		($ in millions)
Foreign Exchange Contracts	General, administrative and corporate expenses	$	(2.7	)	$	—
Foreign Exchange Contracts	Net change from current period hedged transactions	$	2.7		$	—

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Foreign Exchange Contracts. The Company uses foreign exchange contracts to manage foreign currency risk. A foreign exchange contract involves an obligation to purchase or sell a specified currency at a future date at a price set at the time of the contract. Foreign exchange contracts will not eliminate fluctuations in the value of the Company’s assets and liabilities denominated in foreign currencies but rather allow it to establish a rate of exchange for a future point in time.

As at June 30, 2015, the Company held foreign exchange contracts that were not designated as hedging under ASC 815 with an aggregate notional value of $428.5 million (December 31, 2014 — $403.4 million). The foreign exchange contracts are recorded as derivatives at fair value with changes recorded as a change in fair value of derivatives in the statement of operations. For the three and six months ended June 30, 2015, the impact of foreign exchange contracts on net income was a gain of $2.2 million (June 30, 2014 — charge of $1.1 million) and a loss of $2.4 million (June 30, 2014 — gain of $1.9 million), respectively.

As at June 30, 2015, the Company held foreign exchange contracts that were designated as hedging under ASC 815 with an aggregate notional value of $56.4 million (December 31, 2014 — $135.8 million). The foreign exchange contracts are recorded as derivatives at fair value in the balance sheet with the effective portion recorded in other comprehensive income and the ineffective portion recorded as a change in fair value of derivatives in the statement of operations. The contracts are considered to be effective and therefore, for the three and six months ended June 30, 2015, the movement in other comprehensive income representing the effective portion was a net unrealized gain of $5.1 million (June 30, 2014 — $Nil) and a net unrealized gain of $2.7 million (June 30, 2014 — $Nil), respectively.

As the foreign exchange contracts settle, the realized gain or loss is reclassified from other comprehensive income into general, administration and corporate expenses of the statement of operations and other comprehensive income. For the three and six months ended June 30, 2015 the amount recognized within general, administration and corporate expenses for settled foreign exchange contracts was a realized gain of $0.1 million (June 30, 2014 — $Nil) and a realized loss of $2.7 million (June 30, 2014 — $Nil), respectively.

Interest Rate Swaps. As at June 30, 2015, the Company held fixed for floating interest rate swaps with a total notional amount of $951.3 million (December 31, 2014 — $951.3 million) that are due to mature between November 26, 2015 and November 9, 2020. The interest rate swaps are used in the ordinary course of the Company’s investment activities to partially mitigate the negative impact of rises in interest rates on the market value of the Company’s fixed income portfolio. For the three and six months ended June 30, 2015, there was a charge in respect of the interest rate swaps of $0.2 million (June 30, 2014 — charge of $3.5 million) and a charge of $3.4 million (June 30, 2014 — charge of $5.4 million), respectively.

As at June 30, 2015, cash collateral with a fair value of $15.9 million was held by the Company’s counterparties to support the current valuation of the interest rate swaps (December 31, 2014 — $22.3 million). As at June 30, 2015, no non-cash collateral was transferred to the Company by its counterparties (December 31, 2014 — $Nil). Transfers of cash collateral are recorded on the consolidated balance sheet within Derivatives at Fair Value, while transfers in respect of non-cash collateral are disclosed but not recorded. As at June 30, 2015, no amount was recorded in the consolidated balance sheet for the pledged assets.

11. Deferred Policy Acquisition Costs

The following table represents a reconciliation of beginning and ending deferred policy acquisition costs for the three and six months ended June 30, 2015 and 2014:

		Three Months Ended June 30,						Six Months Ended June 30,
		2015			2014			2015			2014
		($ in millions)						($ in millions)
Balance at the beginning of the period		$	333.8		$	289.6		$	299.0		$	262.2
	Acquisition costs deferred	129.3			125.7			283.4			265.1
	Amortization of deferred policy acquisition costs	(114.1		)	(108.9		)	(233.4		)	(220.9		)
Balance at the end of the period		$	349.0		$	306.4		$	349.0		$	306.4

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12. Reserves for Losses and Loss Adjustment Expenses

The following table represents a reconciliation of beginning and ending consolidated loss and loss adjustment expenses (“LAE”) reserves for the six months ended June 30, 2015 and twelve months ended December 31, 2014:

	Six Months Ended June 30, 2015			Twelve Months Ended December 31, 2014
	($ in millions)
Provision for losses and LAE at the start of the year	$	4,750.8		$	4,678.9
Less reinsurance recoverable	(350.0		)	(332.7		)
Net loss and LAE at the start of the year	4,400.8			4,346.2
Net loss and LAE expenses (disposed)	—			(24.2		)
Provision for losses and LAE for claims incurred:
Current year	725.2			1,411.6
Prior years	(58.6		)	(104.1		)
Total incurred	666.6			1,307.5
Losses and LAE payments for claims incurred:
Current year	(33.1		)	(112.1		)
Prior years	(520.6		)	(995.6		)
Total paid	(553.7		)	(1,107.7		)
Foreign exchange (gains)	(35.1		)	(121.0		)
Net losses and LAE reserves at period end	4,478.6			4,400.8
Plus reinsurance recoverable on unpaid losses at period end	337.3			350.0
Provision for losses and LAE at the end of the relevant period	$	4,815.9		$	4,750.8

For the six months ended June 30, 2015, there was a reduction of $58.6 million in the Company’s estimate of the ultimate claims to be paid in respect of prior accident years compared to a reduction of $60.0 million for the six months ended June 30, 2014. The Company has not assumed any loss reserves as part of any transaction and there have been no disposals of transfers of reserves relating to commutations during the six months ended June 30, 2015 (six months ended June 30, 2014 — $24.2 million). For additional information on the reserve releases, please refer to “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Reserves for Losses and Loss Adjustment Expenses” below.

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13. Capital Structure

The following table provides a summary of the Company’s authorized and issued share capital as at June 30, 2015 and December 31, 2014:

	As at June 30, 2015		As at December 31, 2014
	Number	$ in Thousands	Number	$ in Thousands
Authorized share capital:
Ordinary Shares 0.15144558¢ per share	969,629,030	1,469	969,629,030	1,469
Non-Voting Shares 0.15144558¢ per share	6,787,880	10	6,787,880	10
Preference Shares 0.15144558¢ per share	100,000,000	152	100,000,000	152
Total authorized share capital		1,631		1,631
Issued share capital:
Issued ordinary shares of 0.15144558¢ per share	60,777,875	92	62,017,368	94
Issued 7.401% preference shares of 0.15144558¢ each with a liquidation preference of $25 per share	5,327,500	8	5,327,500	8
Issued 7.250% preference shares of 0.15144558¢ each with a liquidation preference of $25 per share	6,400,000	10	6,400,000	10
Issued 5.95% preference shares of 0.15144558¢ each with a liquidation preference of $25 per share	11,000,000	17	11,000,000	17
Total issued share capital		127		129

Additional paid-in capital as at June 30, 2015 was $1,061.7 million (December 31, 2014 — $1,134.3 million). Additional paid-in capital includes the aggregate liquidation preferences of the Company’s preference shares of $568.2 million (December 31, 2014 — $568.2 million) less issue costs of $12.4 million (December 31, 2014 — $12.4 million).

Ordinary Shares. The following table summarizes transactions in the Company’s ordinary shares during the six months ended June 30, 2015:

	Number of Ordinary Shares
Ordinary shares in issue at December 31, 2014	62,017,368
Ordinary share transactions in the six months ended June 30, 2015
Ordinary shares issued to employees under the 2003 and 2013 share incentive plans and/or 2008 share purchase plan	544,034
Ordinary shares issued to non-employee directors	6,806
Ordinary shares repurchased	(1,790,333	)
Ordinary shares in issue at June 30, 2015	60,777,875

Ordinary Share Repurchases. On February 5, 2015, the Company and the Board of Directors agreed a new share repurchase authorization program of $500.0 million. The total share repurchase authorization, which was effective immediately through February 6, 2017, permits the Company to effect the repurchases from time to time through a combination of transactions, including open market repurchases, privately negotiated transactions and accelerated share repurchase transactions.

Under open market repurchases under a Rule 10b5-1 plan, the Company acquired and cancelled for the three and six months ended June 30, 2015, 1,003,195 and 1,790,333 ordinary shares, respectively. The total consideration paid for the three and six months ended June 30, 2015 was $47.2 million and $83.7 million, respectively, with an average price per ordinary share for the three and six months ended June 30, 2015 of $47.06 and $46.74, respectively. Under open market repurchases, the Company acquired and cancelled Nil and 770,505 ordinary shares, respectively, for the three and six months ended June 30, 2014. The total consideration paid for the three and six months ended June 30, 2014 was $Nil and $30.9 million, respectively and the average price per ordinary share was $Nil and $40.08, respectively.

Rights Agreement. On April 17, 2014, the Board of Directors resolved to issue one preferred share purchase right (a “Right”) for each outstanding ordinary share, and adopted a shareholder rights plan, as set forth in the Rights Agreement dated as of April 17, 2014. Each Right would have allowed its holder to purchase from the Company one one-thousandth of a share of Series A Junior Participating Preference Shares for $160, once the Rights became exercisable. The Rights could not be exercisable until 10 business days after the public announcement that a person or group acquired the beneficial ownership of

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10% or more of the outstanding ordinary shares of the Company (or 15% in the case of passive institutional investors). The Rights could have been redeemed at any time at the discretion of the Board of Directors. As of June 30, 2015, no Rights were exercisable or exercised. The Rights Agreement expired on April 16, 2015.

14. Share-Based Payments

The Company has issued options and other equity incentives under three arrangements: the employee incentive plans, the non-employee director plan and the employee share purchase plans. When options are exercised or other equity awards have vested, new shares are issued as the Company does not currently hold treasury shares.

Employee and Non-Employee Director Awards. Employee options and other awards were granted under the Aspen 2003 Share Incentive Plan, as amended (the “2003 Share Incentive Plan”), prior to April 24, 2013 and thereafter under the 2013 Share Incentive Plan (the “2013 Share Incentive Plan”). The total number of ordinary shares that may be issued under the 2013 Share Incentive Plan is 2,845,683 ordinary shares, which includes 595,683 ordinary shares available to grant under the 2003 Share Incentive Plan as of February 25, 2013. The number of ordinary shares that may be issued under the 2013 Share Incentive Plan is adjusted per the number of awards that may be forfeited under the 2003 Share Incentive Plan. The non-employee director awards are granted under the 2006 Stock Option Plan for Non-Employee Directors.

Stock options were granted with an exercise price equivalent to the fair value of the share on the grant date. The weighted average value at grant date is determined using the Black-Scholes option pricing model. Stock options typically vest over a three-year period with a ten-year exercise period (except for options granted in 2007 which had a seven-year exercise period) with vesting dependent on time and performance conditions established at the time of grant. No options were granted during the three and six months ended June 30, 2015 (2014 — Nil and Nil) and Nil and 83,938 options, respectively, were exercised and shares issued in the three and six months ended June 30, 2015 (2014 — 33,587 and 53,436 options). No charges against income were made in respect of employee options for the three and six months ended June 30, 2015 (2014 — $Nil and $Nil).

Restricted share units (“RSUs”) granted to employees typically vest over a three-year period based on continued service. Some of the RSU grants vest at year-end, while others vest on the anniversary of the date of grant or when the Compensation Committee of the Board of Directors agrees to deliver the RSUs. The fair value of the RSUs is based on the closing price on the date of the grant adjusted for illiquidity and is expensed through the income statement evenly over the vesting period. In the three and six months ended June 30, 2015, the Company granted to its employees 3,837 and 242,152 RSUs, respectively (2014 — 259,640 and 259,640). Compensation costs charged against income in respect of RSUs for the three and six months ended June 30, 2015 were $1.5 million and $3.1 million, respectively (2014 — $3.0 million and $5.8 million).

In the case of non-employee directors, generally one-twelfth of the RSUs vest on each one month anniversary of the date of grant, with 100% of the RSUs vesting on the first anniversary of the date of grant. On February 5, 2015 (with a grant date of February 9, 2015), the Board of Directors approved a total of 27,620 RSUs for the non-employee directors (2014 — 27,180 RSUs) and 12,154 RSUs to the Chairman (February 10, 2014 — 13,590 RSUs). Compensation costs charged against income in respect of non-employee director RSUs for the three and six months ended June 30, 2015 were $0.4 million and $0.7 million, respectively (2014 — $0.4 million and $0.8 million).

The total fair value adjustment for all RSUs for the three and six months ended June 30, 2015 was $Nil and $0.3 million, respectively (2014 — $0.6 million and $1.2 million). The total tax credit recognized by the Company in relation to RSUs in the three and six months ended June 30, 2015 was $0.3 million and $0.7 million, respectively (2014 — $0.7 million and $1.3 million).

Performance Shares. During the three and six months ended June 30, 2015, the Company granted Nil and 277,585 performance shares, respectively, to employees (2014 — 315,389 and 315,389). The performance shares will be subject to a three-year vesting period with a separate annual diluted book value per share (“BVPS”) growth test for each year, adjusted to add back ordinary dividends. One-third of the grant will be eligible for vesting each year based on a formula, and will only be issuable at the end of the three-year period.

If the diluted BVPS growth achieved in 2015 is:

• less than 5.6%, then the portion of the performance shares subject to the vesting conditions in such year will be forfeited (i.e., one-third of the initial grant);

• between 5.6% and 11.1%, then the percentage of the performance shares eligible for vesting in such year will be between 10% and 100% on a straight-line basis; or

• between 11.1% and 22.2%, then the percentage of the performance shares eligible for vesting in such year will be between 100% and 200% on a straight-line basis.

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In calculating BVPS for 2015, the entire movement in AOCI will be excluded. Interest rate movements and credit spread movements in AOCI can be fairly significant and impact growth in BVPS which management does not have any control over. The Compensation Committee will review the impact of any capital management actions undertaken during 2015, including share repurchases and special dividends, and consider whether any further adjustments to growth in BVPS should be made in the context of such actions. The calculation of BVPS for 2015 will exclude all transactional expenses incurred in connection with any transaction which, if consummated, would result in a change in control, including without limitation the cost of defending against any such transaction and any third-party legal and advisory costs. The Compensation Committee believes that it would not be appropriate for employees’ performance-related compensation to be impacted by these costs.

The Compensation Committee will determine the vesting conditions for the 2016 and 2017 portions of the grant in such years taking into consideration the market conditions and the Company’s business plans at the commencement of the years concerned. Notwithstanding the vesting criteria for each given year, if the shares eligible for vesting in 2016 and 2017 are greater than 100% for the portion of such year’s grant and the average diluted BVPS growth over such year and the preceding year is less than the average of the minimum vesting thresholds for such year and the preceding year, then only 100% (and no more) of the ordinary shares that are eligible for vesting in such year shall vest. Notwithstanding the foregoing, if in the judgment of the Compensation Committee the main reason for the BVPS metric in the earlier year falling below the minimum threshold is due to the impact of rising interest rates and bond yields, then the Compensation Committee may, in its discretion, disapply this limitation on 100% vesting. 

The fair value of performance share awards is based on the value of the closing share price on the date of the grant adjusted for illiquidity less a deduction for expected dividends which would not accrue during the vesting period. Compensation costs charged against income in the three and six months ended June 30, 2015 in respect of performance shares were $2.0 million and $2.2 million, respectively (2014 — $2.8 million and $4.2 million). The total tax recognized by the Company in relation to performance shares in the three and six months ended June 30, 2015 was a tax credit of $0.4 million and $0.5 million, respectively (2014 — $1.9 million and $3.7 million).

Phantom Shares. During the three and six months ended June 30, 2015, the Compensation Committee approved the grant of Nil and 135,651 phantom shares, respectively, to its employees (2014 — 154,512 and 154,512). The phantom shares are subject to a three-year vesting period with a separate annual diluted BVPS growth test for each year, in accordance with the test described above for the 2015 performance shares, with the difference being that any vested amount would be paid in cash in lieu of ordinary shares. As ordinary shares are not issued, the phantom shares have no dilutive effect. 

The fair value of the phantom shares is based on the closing share price on the date of the grant adjusted for illiquidity, less estimated dividends payable over the vesting period. The fair value is expensed through the consolidated income statement evenly over the vesting period, but as the payment to beneficiaries will ultimately be in cash rather than ordinary shares, an adjustment is required each quarter to revalue the accumulated liability to the balance sheet date fair value. Compensation costs charged against income in the three and six months ended June 30, 2015 in respect of phantom shares were $1.1 million and $2.0 million, respectively (2014 — $0.8 million and $2.4 million) with a fair value adjustment for the three and six months ended June 30, 2015 of $0.9 million and $2.0 million, respectively (2014 — $0.3 million and $0.5 million). The total tax credit recognized by the Company in relation to phantom shares in the three and six months ended June 30, 2015 was $0.3 million and $0.7 million, respectively (2014 — $0.3 million and $0.5 million).

Employee Share Purchase Plans. On April 30, 2008, the shareholders of the Company approved the Employee Share Purchase Plan, the 2008 Sharesave Scheme and the International Employee Share Purchase Plan (collectively, the “ESPP”), which are implemented by a series of consecutive offering periods as determined by the Board of Directors. In respect of the Employee Share Purchase Plan, employees can save up to $500 per month over a two-year period, at the end of which they will be eligible to purchase the Company’s ordinary shares at a discounted price, subject to a further one year holding period. In respect of the 2008 Sharesave Scheme, employees can save up to £250 per month over a three-year period (and effective April 6, 2014, £500 per month), at the end of which they will be eligible to purchase the Company’s ordinary shares at a discounted price. The purchase price will be eighty-five percent (85%) of the fair market value of an ordinary share on the offering date which may be adjusted upon changes in capitalization of the Company. Under the ESPP, 2,224 and 54,676 ordinary shares, respectively, were exercised and issued during the three and six months ended June 30, 2015 (2014 — 1,200 and 11,194 shares). Compensation costs charged against income in the three and six months ended June 30, 2015 in respect of the ESPP were $0.1 million and $0.2 million, respectively (2014 — $Nil and $0.1 million).

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15. Intangible Assets

The following tables provide a summary of the Company’s intangible assets for the three and six months ended June 30, 2015 and 2014:

	Three Months Ended June 30, 2015								Three Months Ended June 30, 2014
	Trade Mark		Insurance Licenses		Other		Total		Trade Mark		Insurance Licenses		Other			Total
	($ in millions)								($ in millions)
Intangible Assets
Beginning of the period	$	1.6	$	16.6	$	—	$	18.2	$	1.6	$	16.6	$	0.1		$	18.3
Amortization	—		—		—		—		—		—		(0.1		)	(0.1		)
End of the period	$	1.6	$	16.6	$	—	$	18.2	$	1.6	$	16.6	$	—		$	18.2

	Six Months Ended June 30, 2015								Six Months Ended June 30, 2014
	Trade Mark		Insurance Licenses		Other		Total		Trade Mark		Insurance Licenses		Other			Total
	($ in millions)								($ in millions)
Intangible Assets
Beginning of the period	$	1.6	$	16.6	$	—	$	18.2	$	1.6	$	16.6	$	0.2		$	18.4
Amortization	—		—		—		—		—		—		(0.2		)	(0.2		)
End of the period	$	1.6	$	16.6	$	—	$	18.2	$	1.6	$	16.6	$	—		$	18.2

License to use the “Aspen” Trademark. On April 5, 2005, the Company entered into an agreement with Aspen (Actuaries and Pension Consultants) Plc to acquire the right to use the Aspen trademark in the United Kingdom. The consideration paid was approximately $1.6 million. As at June 30, 2015, the value of the license to use the Aspen trademark was $1.6 million (December 31, 2014 — $1.6 million). The trademark has an indefinite useful life and is tested for impairment annually or when events or changes in circumstances indicate that the asset might be impaired.

Insurance Licenses. The total value of the licenses as at June 30, 2015 was $16.6 million (December 31, 2014 — $16.6 million). This includes $10.0 million of acquired licenses held by AAIC, $4.5 million of acquired licenses held by Aspen Specialty and $2.1 million of acquired licenses held by Aspen U.K. The insurance licenses are considered to have an indefinite life and are not amortized. The licenses are tested for impairment annually or when events or changes in circumstances indicate that the asset might be impaired.

Other. In 2010, the Company purchased APJ Continuation Limited and its subsidiaries (“APJ”) for an aggregate consideration of $4.8 million. The Board of Directors assessed the fair value of the net tangible and financial assets acquired at $1.2 million. The $3.6 million intangible asset represented the Company’s assessment of the value of renewal rights and distribution channels ($2.2 million) and the lock-in period for employees associated with the business ($1.4 million). The asset was amortized over a five-year period and the value as at June 30, 2015 was $Nil (December 31, 2014 — $Nil).

16. Commitments and Contingent Liabilities

(a) Restricted assets

The Company is obliged by the terms of its contractual obligations to U.S. policyholders and by obligations to certain regulatory authorities to facilitate issue of letters of credit or maintain certain balances in trust funds for the benefit of policyholders.

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The following table details the forms and value of the Company’s restricted assets as at June 30, 2015 and December 31, 2014:

	As at June 30, 2015			As at December 31, 2014
	($ in millions, except percentages)
Regulatory trusts and deposits:
Affiliated transactions	$	978.9		$	1,086.9
Third party	2,182.1			2,183.4
Letters of credit / guarantees(1)	710.5			778.7
Total restricted assets	$	3,871.5		$	4,049.0
Total as percent of cash and invested assets	45.5		%	47.0		%

⁽¹⁾  As of June 30, 2015, the Company had pledged funds of $701.3 million and £9.2 million (December 31, 2014 — $764.4 million and £9.2 million) as collateral for the secured letters of credit.

Funds at Lloyd’s. AUL operates at Lloyd’s as the corporate member for Syndicate 4711. Lloyd’s determines Syndicate 4711’s required regulatory capital principally through the syndicate’s annual business plan. Such capital, called Funds at Lloyd’s, comprises cash and investments as at June 30, 2015 in the amount of $413.3 million (December 31, 2014 — $411.9 million).

The amounts provided as Funds at Lloyd’s will be drawn upon and become a liability of the Company in the event of Syndicate 4711 declaring a loss at a level that cannot be funded from other resources, or if Syndicate 4711 requires funds to cover a short term liquidity gap. The amount which the Company provides as Funds at Lloyd’s is not available for distribution to the Company for the payment of dividends. Aspen Managing Agency Limited, the managing agent to Syndicate 4711, is also required by Lloyd’s to maintain a minimum level of capital which as at June 30, 2015 was £0.4 million (December 31, 2014 — £0.4 million). This is not available for distribution by the Company for the payment of dividends.

Letters of Credit Facility. On June 30, 2014, Aspen Bermuda and Citibank Europe plc (“Citi Europe”) replaced an existing letter of credit facility, dated July 30, 2012, in a maximum aggregate amount of up to $950.0 million (the “LOC Facility”) comprised of two maturity tranches (Tranche I with a limit of $650.0 million and Tranche II with a limit of $300.0 million) which expired on its own terms on June 30, 2014. The LOC Facility was replaced with a new letter of credit facility in a maximum aggregate amount of up to $575.0 million (the “New LOC Facility”). Under the New LOC Facility, which will expire on June 30, 2016, Aspen Bermuda will pay to Citi Europe (a) a letter of credit fee based on the available amounts of each letter of credit and (b) a commitment fee, which varies based upon usage, on the unutilized portion of the New LOC Facility. Aspen Bermuda will also pay interest on the amount drawn by any beneficiary under a credit provided under the New LOC Facility at a rate per annum of LIBOR plus 1% (plus reserve asset costs, if any) from the date of drawing until the date of reimbursement by Aspen Bermuda. The New LOC Facility is used to secure obligations of Aspen Bermuda to its policyholders. In addition to the New LOC Facility, we also use regulatory trusts to secure our obligations to policyholders.

The terms of a Pledge Agreement between Aspen Bermuda and Citi Europe (pursuant to an Assignment Agreement dated October 11, 2006) dated January 17, 2006, as amended, were also amended on June 30, 2014 to change the types of securities or other assets that are acceptable as collateral under the New LOC Facility. All other agreements relating to Aspen Bermuda’s LOC Facility, which now apply to the New LOC Facility with Citi Europe, as previously filed with the United States Securities and Exchange Commission, remain in full force and effect.

On December 18, 2014, Aspen Bermuda and Citi Europe entered into an amended and restated pledge agreement (“Pledge Agreement”) to, among other things, (i) change the types of securities or other assets that qualify as collateral pledged under the Pledge Agreement, (ii) provide Aspen Bermuda the right to give certain directions or entitlement orders to The Bank of New York Mellon (“BNY Mellon”), as securities intermediary, relating to the collateral without the consent of Citi Europe provided certain conditions are satisfied, (iii) provide Citi Europe, subject to the provisions set forth in the amended and restated account control agreement, dated December 18, 2014 (the “Control Agreement”), among Aspen Bermuda, Citi Europe and BNY Mellon, with the right and power to exercise exclusive control over the accounts set forth in the Control Agreement and (iv) provide a schedule of currency margins such that if the collateral is denominated in a currency other than the credit currency the collateral shall be reduced by a specified percentage.

On December 12, 2014, Aspen Holdings and certain of its subsidiaries (the “Borrowers”) entered into a first amendment to an amended and restated credit agreement, dated June 12, 2013, with various lenders and Barclays Bank Plc, as administrative agent (“Barclays”). Aspen Holdings has recently established, and may establish additional, special purpose entities that have issued or will issue insurance-linked securities to third-party investors (each, an “ILS Entity” and collectively, the “ILS Entities”). Accordingly, the amended and restated credit agreement was amended, among other things, to (i) exclude

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ILS Entities from the definition of “Subsidiary”, (ii) permit the Borrowers to invest in ILS Entities and (iii) permit the Borrowers to engage in transactions with an ILS Entity.

Aspen U.K. and Aspen Bermuda have a $100.0 million secured letter of credit facility agreement with Barclays. All letters of credit issued under the facility are used to support reinsurance obligations of the parties to the agreement and their respective subsidiaries. The Company did not extend the maturity date of the Barclays secured letter of credit facility and, as a result, it expired on January 31, 2015 and no new letters of credit can be issued under this facility. As at June 30, 2015, the Company had no outstanding collateralized letters of credit under this facility (December 31, 2014 — $5.0 million).

For further information relating to the Company’s credit facilities, refer to Note 23 of the “Notes to Audited Consolidated Financial Statements” in the Company’s 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission.

Interest Rate Swaps. As at June 30, 2015, cash collateral with a fair value of $15.9 million was held by the Company’s counterparties to support the current valuation of the interest rate swaps (December 31, 2014 — $22.3 million). For more information, refer to Note 10 of these unaudited condensed consolidated financial statements.

(b) Operating leases

Amounts outstanding under operating leases net of subleases as of June 30, 2015 were:

	2015		2016		2017		2018		2019		Later Years		Total
	($ in millions)
Operating Lease Obligations	$	6.8	$	9.8	$	8.5	$	7.0	$	6.1	$	12.9	$	51.1

(c) Contingent liabilities

In common with the rest of the insurance and reinsurance industry, the Company is subject to litigation and arbitration in the ordinary course of business. The Company’s Operating Subsidiaries are regularly engaged in the investigation, conduct and defense of disputes, or potential disputes, resulting from questions of insurance or reinsurance coverage or claims activities. Pursuant to insurance and reinsurance arrangements, many of these disputes are resolved by arbitration or other forms of alternative dispute resolution. Such legal proceedings are considered in connection with estimating the Company’s Insurance Reserves — Loss and Loss Adjustment Expenses, as provided on the Company’s consolidated balance sheet.

In some jurisdictions, notably the U.S., a failure to deal with such disputes or potential disputes in an appropriate manner could result in an award of “bad faith” punitive damages against the Company’s Operating Subsidiaries. In accordance with ASC 450-20-50-4b, for (a) reasonably possible losses for which no accrual is made because any of the conditions for accrual in ASC 450-20-25-2 are not met and (b) reasonably possible losses in excess of the amounts accrued pursuant to ASC 450-20-30-1, the Company will provide an estimate of the possible loss or range of possible loss or state that such an estimate cannot be made.

As of June 30, 2015, based on available information, it was the opinion of the Company’s management that the probability of the ultimate resolution of pending or threatened litigation or arbitrations having a material effect on the Company’s financial condition, results of operations or liquidity would be remote.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following is a discussion and analysis of our financial condition and results of operations for the three and six months ended June 30, 2015 and 2014. This discussion and analysis should be read in conjunction with the unaudited condensed consolidated financial statements and related notes contained in this report and the audited consolidated financial statements and related notes for the fiscal year ended December 31, 2014, as well as the discussions of critical accounting policies, contained in our Audited Consolidated Financial Statements in our 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission.

Some of the information contained in this discussion and analysis or set forth elsewhere in this report, including information with respect to our plans and strategy for our business and in “Outlook and Trends” below, includes forward-looking statements that involve risks and uncertainties. Please see the section captioned “Cautionary Statement Regarding Forward-Looking Statements” in this report and the “Risk Factors” in Item 1A of our 2014 Annual Report on Form 10-K for more information on factors that could cause actual results to differ materially from the results described in, or implied by, any forward-looking statements contained in this discussion and analysis.

Overview

We are a Bermuda holding company and write insurance and reinsurance business through our subsidiaries in Bermuda, the U.K. and the U.S.

Key results for the three and six months ended June 30, 2015 include:

• Gross written premiums of $722.8 million for the second quarter of 2015, a decrease of 7.3% from the second quarter of 2014. Gross written premiums in reinsurance decreased by 12.6% mainly due to planned reductions associated with more challenging market conditions in our property catastrophe business line and due to timing of contract renewals in our property catastrophe and casualty business lines, while gross written premiums in insurance decreased by 3.9% largely due to lower production in our marine, energy and construction line combined with favorable prior-year premium adjustments in the comparative period;

• Net favorable development on prior year loss reserves of $31.1 million for the second quarter of 2015 had a 5.1 percentage point favorable impact on the combined ratio, compared with a reserve release of $31.8 million in the second quarter of 2014, which had a 5.2 percentage point favorable impact on the combined ratio;

• Combined ratio of 93.6% for the second quarter of 2015 compared with a combined ratio of 90.1% for the second quarter of 2014. There were $11.9 million, or 2.0 combined ratio points, of pre-tax catastrophe losses net of reinsurance recoveries in the second quarter of 2015 compared with $22.1 million, or 3.6 percentage points, of pre-tax catastrophe losses net of reinsurance recoveries in the second quarter of 2014;

• In thesecond quarter of 2015, there were $40.0 million, or 6.6 combined ratio points, of pre-tax mid-sized property insurance and energy physical damage losses in the insurance segment compared with no significant non-catastrophe losses in thesecond quarter of 2014;

• Realized and unrealized foreign exchange losses of $11.6 million for the second quarter of 2015 compared with gains of $10.7 million in the second quarter of 2014 predominantly due to the continued strengthening of the U.S. Dollar during 2015;

• Realized and unrealized investment losses of$15.3 millionfor thesecondquarter of2015compared with gains of$31.3 millionin thesecondquarter of2014. The losses in the quarter were due to mark to market changes in the valuation of our equity and fixed income trading portfolios;

• Diluted net income per share of $0.62 for the quarter ended June 30, 2015 compared with diluted net income per share of $1.82in the same quarter last year;

• Annualized net income return on average equity of 5.6% for the second quarter of 2015 compared with 16.8% for the second quarter of 2014; and

• Diluted book value per share⁽¹⁾ of $45.16 as at June 30, 2015, up 0.1% from December 31, 2014, which included net unrealized losses on foreign currency translation, net of taxes, of $42.3 million.

⁽¹⁾ Diluted book value per ordinary share is based on total shareholders’ equity less preference shares (liquidation preference less issue expenses) and non-controlling interest, divided by the total number of issued and potentially dilutive ordinary shares at the end of the period.

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Total shareholders’ equity reduced by $102.2 million to $3,363.6 million for the three months ended June 30, 2015. The most significant movements were:

• an $84.5 million reduction in total other comprehensive income mainly due to a $74.0 million loss in the net unrealized available for sale investments, net unrealized losses in foreign currency translation of $16.2 million, a $5.1 million net gain on foreign exchange contracts and a $0.6 million reclassification of net realized losses;

• an $26.1 million increase in retained earnings for the period; and

• the repurchase of 1,003,195 million ordinary shares for $47.2 million through open market repurchases.

Ordinary shareholders’ equity as at June 30, 2015 and December 31, 2014 was:

	As at June 30, 2015			As at December 31, 2014
	($ in millions, except for share amounts)
Total shareholders’ equity	$	3,363.6		$	3,419.3
Preference shares less issue expenses	(555.8		)	(555.8		)
Non-controlling interests	(1.0		)	(0.5		)
Net assets attributable to ordinary shareholders	$	2,806.8		$	2,863.0
Issued ordinary shares	60,777,875			62,017,368
Issued and potentially dilutive ordinary shares	62,149,130			63,444,356

Outlook and Trends

Overall, the market has continued to experience pressure on rates in reinsurance and insurance. In reinsurance, we continued to execute our plan of strategic growth by targeting areas where rates are less pressured, such as other property reinsurance and specialty reinsurance, and utilizing our close client relationships, tailored solutions and international office network to gain share in those areas. In addition, we wrote a significant amount of pro rata reinsurance in the second quarter of 2015 which we expect to recognize over time.

In insurance, the rate environment was under intense pressure in certain lines of business while in other lines of business and geographies rates held steady. In the United States, overall rates during the second quarter of 2015 decreased by 1%. In international insurance, the rate environment varied widely by line of business but overall rates decreased by 2%. Rates were flat in our professional liability lines and technology lines whereas U.K. regional rates increased slightly. In our energy physical damage line of business, rates decreased by as much as 14%, with rates down even more for Gulf of Mexico windstorm exposure. In the quarter, the energy markets written out of London experienced meaningfully increased competition. As a result, we chose to allocate capital away from those markets which led to a significant decrease in premiums for the second quarter of 2015.

See “Cautionary Statement Regarding Forward-Looking Statements” included in this report.

Application of Critical Accounting Policies

Our unaudited condensed consolidated financial statements are based on the selection of accounting policies and require management to make significant estimates and assumptions. Some of the more critical judgments in the areas of accounting estimates and assumptions that affect our financial condition and results of operations are related to insurance reserves, premiums receivable in respect of assumed reinsurance, the fair value of derivatives and the value of investments, including the extent of any other-than-temporary impairment. There have been no changes to significant accounting policies from those disclosed in the Company’s Annual Report on Form 10-K. For a detailed discussion of our critical accounting policies, please refer to Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Critical Accounting Policies” in our 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission and the notes to the consolidated condensed unaudited financial statements contained in this report.

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Results of Operations for the Three Months Ended June 30, 2015 Compared to the Three Months Ended June 30, 2014

The following is a discussion and analysis of our consolidated results of operations for the three months ended June 30, 2015 and 2014, starting with a summary of our consolidated results and followed by a segmental analysis.

Total Income Statement

Our statements of operations consolidate the underwriting results of our two business segments and include certain other revenue and expense items that are not allocated to segments.

Gross written premiums. Gross written premiums decreased by $56.5 million, or 7.3%, in the second quarter of 2015 compared to the second quarter of 2014. Our reinsurance segment’s premiums decreased by 12.6% due to reductions in gross written premiums across the majority of lines and the timing on contract renewals. The reduction in property catastrophe premiums in the second quarter of 2015 is mainly due to planned reductions associated with more challenging market conditions. Other property premiums are in line with the comparative quarter and have increased for the year to date due to new business opportunities. Specialty reinsurance, which has a diverse set of products, had reported a small reduction in premiums in the quarter but had increased premiums for the year to date due to new opportunities from long-term contracts. Casualty reinsurance was lower than the comparative quarter largely due to favorable prior year premium adjustments recorded in the comparative quarter.

Our insurance segment’s premiums decreased by 3.9%. While our premium in property and casualty insurance increased by 15.1%, this was more than offset by reductions in marine, aviation and energy insurance, in particular in marine and energy liability and offshore energy due to difficult market conditions. The comparative period in 2014 also benefited from favorable prior-year premium adjustments. The increase in gross written premiums in property and casualty insurance is largely attributable to growth in our programs and U.S. casualty business lines. The table below shows our gross written premiums for each segment for the three months ended June 30, 2015 and 2014, and the percentage change in gross written premiums for each segment:

Business Segment	Three Months Ended June 30, 2015		Three Months Ended June 30, 2014		% (decrease)
	($ in millions)		($ in millions)
Reinsurance	$	260.7	$	298.4	(12.6	)%
Insurance	462.1		480.9		(3.9	)%
Total	$	722.8	$	779.3	(7.3	)%

Ceded reinsurance. Total reinsurance ceded for the quarter of $78.4 million reduced by $14.5 million from the second quarter of 2014 mainly as a result of our strategy to retain more risk which has reduced the ceded reinsurance costs for our insurance segment. The impact from this strategy has been partially offset through the growth of Aspen Capital Markets which has allowed us to increase our gross catastrophe reinsurance line sizes resulting in more risk ceded to third-party investors in our reinsurance segment. Our retention ratio, defined as net written premium as a percentage of gross written premium, increased by 1.1% to 89.2% in the second quarter of 2015 compared to 88.1% in the second quarter of 2014.

Net premiums earned. Net premiums earned in the second quarter of 2015 decreased by 1.1% from the second quarter of 2014, due to the comparative period benefiting from favorable premium adjustments which were fully earned.

Losses and loss adjustment expenses. The loss ratio for the quarter of 59.2% increased by 4.5 percentage points compared to the second quarter of 2014 due to an increased frequency of large losses. We incurred $15.0 million of fire and weather-related losses in the U.S. and $25.1 million of energy-related losses. In contrast, we had no significant non-catastrophe large losses in the second quarter of 2014.

There were $11.9 million, or 2.0 combined ratio points, of pre-tax catastrophe losses net of reinsurance recoveries in the second quarter of 2015 compared with $22.1 million, or 3.6 percentage points, of pre-tax catastrophe losses net of reinsurance recoveries in the second quarter of 2014.

In the reinsurance segment, the 1.5 percentage point decrease in the loss ratio from 44.8% in the second quarter of 2014 to 43.3% in the second quarter of 2015 was due to a reduction in catastrophe losses compared to the comparative quarter partially offset by a $4.3 million reduction in prior year reserve releases from $28.4 million in the second quarter of 2014 to $24.1 million in the current period. In the second quarter of 2015, we experienced $2.4 million of natural catastrophe losses from U.S. winter storms whereas the comparable quarter of 2014 experienced $11.9 million of catastrophe losses associated with U.S. storms and Japanese snowstorms.

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In the insurance segment, the loss ratio for the second quarter of 2015 increased to 71.6% compared to 62.9% for the three months ended June 30, 2014, due to $15.0 million of fire and weather-related losses in the U.S., $20.0 million of energy-related losses and a $5.0 million train derailment loss. Prior year reserve releases increased from $3.4 million in the second quarter of 2014 to $7.0 million in the current period. The loss ratio for the current quarter was also adversely affected by $9.5 million of catastrophe losses largely associated with U.S. weather-related events while the comparative period in 2014 experienced $10.2 million of U.S. weather-related events.

We monitor the ratio of losses and LAE to net earned premium (the “loss ratio”) as a measure of relative underwriting performance where a lower ratio represents a better result than a higher ratio. The loss ratios for our two business segments for the three months ended June 30, 2015 and 2014 were as follows:

Business Segment	Three Months Ended June 30, 2015		Three Months Ended June 30, 2014
Reinsurance	43.3	%	44.8	%
Insurance	71.6	%	62.9	%
Total Loss Ratio	59.2	%	54.7	%

We also present, in the tables below, loss ratios including and excluding the impact from catastrophe losses to aid in the analysis of the underlying performance of our segments. For this purpose, we have defined second quarter 2015 catastrophe losses as losses associated with storms in the U.S. Catastrophe losses in the second quarter of 2014 related to winter storms in the U.S. and Japan and flood losses in the U.K.

The underlying changes in loss ratios by segment are shown in the tables below for the three months ended June 30, 2015 and 2014. The total loss ratio represents the calendar year U.S. GAAP loss ratio. The current year adjustments represent the effect on the loss ratio of net claims and reinstatement premiums, if any, from catastrophe loss events.

For the Three Months Ended June 30, 2015	Total Loss Ratio		Current Year Adjustments		Loss Ratio Excluding Current Year Adjustments
Reinsurance	43.3	%	(0.9	)%	42.4	%
Insurance	71.6	%	(2.8	)%	68.8	%
Total	59.2	%	(2.0	)%	57.2	%

For the Three Months Ended June 30, 2014	Total Loss Ratio		Current Year Adjustments		Loss Ratio Excluding Current Year Adjustments
Reinsurance	44.8	%	(4.3	)%	40.5	%
Insurance	62.9	%	(3.0	)%	59.9	%
Total	54.7	%	(3.6	)%	51.1	%

Reserve releases in our reinsurance segment reduced from $28.4 million in the second quarter of 2014 to $24.1 million in the current period. Favorable reserve development in the second quarter of 2015 was across all reinsurance lines though predominantly from our property and casualty lines. The lower level of reserve releases this quarter compared to 2014 is attributable mainly to specialty reinsurance. Reserve releases for the insurance segment increased from $3.4 million in the second quarter of 2014 to $7.0 million in the current period. The releases were due primarily to favorable development in property and casualty lines.

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Expense ratio. We monitor the ratio of expenses to net earned premium (the “expense ratio”) as a measure of the cost effectiveness of our amortization of deferred policy acquisition costs, general, administrative and corporate expenses. The table below splits the net expense ratio between the amortized deferred policy acquisition costs, general, administrative and corporate expenses and the effect of reinsurance for each of the three months ended June 30, 2015 and 2014:

	Three Months Ended June 30, 2015						Three Months Ended June 30, 2014
Ratios Based on Gross Earned Premium	Reinsurance		Insurance		Total		Reinsurance		Insurance		Total
Policy acquisition expense ratio	17.5	%	15.1	%	16.1	%	17.2	%	14.6	%	15.7	%
General and administrative expense ratio(1)	12.3		10.7		13.4		12.4		12.6		15.7
Gross expense ratio	29.8		25.8		29.5		29.6		27.2		31.4
Effect of reinsurance	2.2		6.2		4.9		1.1		5.4		4.0
Total net expense ratio	32.0	%	32.0	%	34.4	%	30.7	%	32.6	%	35.4	%

⁽¹⁾  The total group general and administrative expense ratio includes corporate expenses.

Policy acquisition expenses in the reinsurance and insurance segments increased due to changes in business mix, in particular as a result of a greater proportion of other property and specialty reinsurance business being written which incurs higher acquisition costs.

General, administrative and corporate expenses decreased by $13.4 million to $95.4 million in the second quarter of 2015 from $108.8 million in the second quarter of 2014 as the corporate expenses in the second quarter of 2014 included $5.3 million in non-recurring costs associated with the cost of defending the unsolicited approach from Endurance Specialty Holdings Ltd. (“Endurance”).

Net investment income. Net investment income for the quarter of $46.7 million increased by 1.3% compared to $46.1 million in the second quarter of 2014 due to an increase in dividend income from our equity securities compensating for a reduction in yield from our fixed income portfolio.

Change in fair value of derivatives. In the three months ended June 30, 2015, we recorded a loss of $0.2 million (2014 — loss of $3.5 million) in respect of interest rate swaps, a gain of $2.2 million (2014 — loss of $1.1 million) in respect of foreign exchange contracts not designated as hedging instruments and a gain of $0.1 million (2014 — $Nil) in respect of foreign exchange contracts designated as hedging instruments.

Income before tax. In the second quarter of 2015, income before tax was $51.2 million (2014 — $137.0 million) comprising the amounts set out in the table below:

	Three Months Ended June 30, 2015			Three Months Ended June 30, 2014
	($ in millions)
Underwriting income	$	54.2		$	83.3
Corporate expenses	(14.8		)	(21.9		)
Other income	0.6			2.0
Net investment income	46.7			46.1
Change in fair value of derivatives	2.0			(4.6		)
Change in fair value of loan notes issued by variable interest entities	(3.3		)	(2.6		)
Realized and unrealized investment gains	13.5			34.6
Realized and unrealized investment losses	(28.8		)	(3.3		)
Net realized and unrealized foreign exchange (losses)/gains	(11.6		)	10.7
Interest expense	(7.3		)	(7.3		)
Income before tax	$	51.2		$	137.0

Taxes. Income tax expense for the three months ended June 30, 2015 was $2.2 million (2014 — $6.2 million) equating to an estimated effective tax rate of 4.3% (2014 — 4.5%). The effective tax rate represents an estimate of the tax rate which will apply to our pre-tax income for 2015 including adjustments to prior period estimates. The effective tax rate for the year is subject to revision in future periods if circumstances change and depends on the relative profitability of those parts of business underwritten in Bermuda (where the rate of tax on corporate profits is zero), the U.K. (where the corporate tax rate decreased

45

from 23% to 21%, effective April 1, 2014, with a further reduction to 20% from April 1, 2015) and the U.S. (where the corporate tax rate is 34%).

Net income after tax. Net income after tax for the three months ended June 30, 2015 was $49.0 million, equivalent to basic earnings per ordinary share of $0.64 adjusted for the $9.4 million preference share dividends and $0.5 million non-controlling interest. Fully diluted earnings per ordinary share were $0.62. Net income after tax for the three months ended June 30, 2014 was $130.8 million, equivalent to basic earnings per ordinary share of $1.85 after deducting $9.4 million in preference share dividends and non-controlling interest. Fully diluted earnings per ordinary share were $1.82 for the three months ended June 30, 2014.

Investment gains/(losses). Total realized and unrealized investment losses for the three months ended June 30, 2015 were $15.3 million (2014 — gain of $31.3 million) comprising the amounts set out in the table below:

	Three Months Ended June 30, 2015			Three Months Ended June 30, 2014
	($ in millions)
Available for sale:
Fixed income securities — gross realized gains	$	1.1		$	2.0
Fixed income securities — gross realized (losses)	(0.6		)	(1.4		)
Equity securities — gross realized gains	—			4.2
Total other-than-temporary impairments	—			(0.7		)
Trading:
Fixed income securities — gross realized gains	1.3			2.8
Fixed income securities — gross realized (losses)	(0.4		)	(1.0		)
Equity securities — gross realized gains	11.9			0.7
Equity securities — gross realized (losses)	(4.3		)	(0.2		)
Catastrophe bonds	(0.8		)	(0.1		)
Net change in gross unrealized gains	(23.5		)	25.0
Total realized and unrealized investment (losses)/gains	$	(15.3	)	$	31.3

Other comprehensive (loss). The total other comprehensive loss for the three months ended June 30, 2015 was $84.5 million (2014 — gain of $52.3 million), net of taxes. The loss was mainly due to a $74.0 million reduction in the net unrealized available for sale investment portfolio as a result of changing long-term interest rate expectations (2014 — $31.5 million net unrealized gain), net unrealized losses in foreign currency translation of $16.2 million (2014 — $22.8 million net unrealized gains) and a $5.1 million (2014 — $Nil) net change from hedged foreign exchange contracts and a $0.6 million reclassification of net realized losses to net income (2014 — $2.0 million reclassified net realized gains) as a result of the sale of the available for sale equity portfolio.

Non-controlling interest. In the three months ended June 30, 2015, we recorded an increase of $0.5 million (2014 — $Nil) in the amount owed to the non-controlling interest in respect of Aspen Risk Management Limited.

Dividends. The dividend on our ordinary shares increased from $0.20 per ordinary share to $0.21 per ordinary share on April 22, 2015. The dividend on our ordinary shares increased from $0.18 per ordinary share to $0.20 per ordinary share on April 23, 2014. Dividends paid on our ordinary and preference shares in the three months ended June 30, 2015 were $22.4 million (2014 — $22.5 million).

Underwriting Results by Operating Segments —Second Quarter

We are organized into two business segments: Reinsurance and Insurance. The reinsurance segment consists of property catastrophe reinsurance, other property reinsurance, casualty reinsurance and specialty reinsurance. The insurance segment consists of property and casualty insurance, marine, aviation and energy insurance and financial and professional lines insurance.

We have provided additional disclosures for corporate and other (non-underwriting) income and expenses in Note 5 of our unaudited condensed consolidated financial statements included in this report. Corporate and other income includes net investment income, net realized and unrealized investment gains or losses, corporate expenses, interest expense, net realized and unrealized foreign exchange gains or losses and income taxes, none of which are allocated to the business segments.

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Please refer to the tables in Note 5 in our unaudited condensed consolidated financial statements of this report for a summary of gross and net written and earned premiums, underwriting results and combined ratios and reserves for our two business segments for the three months ended June 30, 2015 and 2014. The contributions of each segment to gross written premiums in the three months ended June 30, 2015 and 2014 were as follows:

	Gross Written Premiums
Business Segment	Three Months Ended June 30, 2015		Three Months Ended June 30, 2014
	(% of total gross written premiums)
Reinsurance	36.1	%	38.3	%
Insurance	63.9		61.7
Total	100.0	%	100.0	%

	Gross Written Premiums
Business Segment	Three Months Ended June 30, 2015		Three Months Ended June 30, 2014
	($ in millions)
Reinsurance	$	260.7	$	298.4
Insurance	462.1		480.9
Total	$	722.8	$	779.3

Reinsurance

Our reinsurance segment consists of property catastrophe reinsurance, other property reinsurance (risk excess, pro rata and facultative), casualty reinsurance (U.S. treaty, international treaty and global facultative) and specialty reinsurance (credit and surety, agriculture, marine, aviation, engineering and other specialty). For a more detailed description of this segment, see Part I, Item 1, “Business — Business Segments — Reinsurance” in the Company’s 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission.

Gross written premiums. Gross written premiums in our reinsurance segment decreased by 12.6% compared to the three months ended June 30, 2014. The table below shows our gross written premiums for each line of business for the three months ended June 30, 2015 and 2014, and the percentage change in gross written premiums for each such line:

Lines of Business	Three Months Ended June 30, 2015		Three Months Ended June 30, 2014		% increase/(decrease)
	($ in millions)		($ in millions)
Property catastrophe reinsurance	$	67.3	$	91.6	(26.5	)%
Other property reinsurance(1)	84.0		84.0		—	%
Casualty reinsurance	49.0		60.6		(19.1	)%
Specialty reinsurance(1)	60.4		62.2		(2.9	)%
Total	$	260.7	$	298.4	(12.6	)%

(1) The 2014 quarterly Reinsurance segment disclosures have been re-presented to include Engineering within Specialty Reinsurance (previously classified within Other Property Reinsurance) to be consistent with the 2015 quarterly disclosures.

The reduction in property catastrophe premiums in the second quarter of 2015 is mainly due to planned reductions associated with more challenging market conditions. Other property premiums are in line with the comparative quarter and have increased for the year to date due to new business opportunities. Specialty reinsurance, which has a diverse set of products, has reported a small reduction in premiums in the quarter but has increased premiums for the year to date due to new opportunities from long-term contracts. Casualty reinsurance is lower than the comparative quarter largely due to favorable prior year premium adjustments recorded in the comparative quarter.

Losses and loss adjustment expenses. The loss ratio for the three months ended June 30, 2015 was 43.3% compared to 44.8% in the equivalent period in 2014. The decrease in the loss ratio is primarily attributable to a reduction in catastrophe losses compared to the comparative quarter partially offset by a $4.3 million reduction in prior year reserve releases from $28.4 million in the second quarter of 2014 to $24.1 million in the current period. In the second quarter of 2015, we experienced $2.4 million of natural catastrophe losses from U.S. winter storms whereas the comparable quarter of 2014 experienced $11.9 million of catastrophe losses associated with U.S. storms and Japanese snowstorms.

47

Reserve releases for the current quarter were mainly as a result of favorable development in U.S. casualty and property pro rata business lines. Further information relating to the movement of prior year reserves is found below under “Reserves for Losses and Loss Adjustment Expenses.”

Policy acquisition, general and administrative expenses. Amortization of deferred policy acquisition costs was $50.4 million for the three months ended June 30, 2015 equivalent to 18.8% of net premiums earned compared to $49.8 million or 17.9% of net premiums earned in the equivalent period in 2014. The increase in the ratio was mainly due to the effect of increased ceded reinsurance costs reducing net premiums earned but also due to changes in the mix of business written, in particular as a result of a greater proportion of other property and specialty business. The general and administrative expenses were generally flat in the quarter at $35.4 million compared to $35.8 million in the equivalent period in 2014. However, the general and administrative expense ratio increased to 13.2% from 12.8% for the same period in 2014 also due to the impact of higher ceded costs on net premiums earned.

Insurance

Our insurance segment consists of property and casualty insurance, marine, aviation and energy insurance and financial and professional lines insurance. For a more detailed description of this segment, see Part I, Item 1 “Business — Business Segments — Insurance” in the Company’s 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission.

Gross written premiums. Gross written premiums in our insurance segment decreased by 3.9% compared to the three months ended June 30, 2014. The table below shows our gross written premiums for each line of business for the three months ended June 30, 2015 and 2014, and the percentage change in gross written premiums for each line:

Lines of Business	Three Months Ended June 30, 2015		Three Months Ended June 30, 2014		% increase/(decrease)
	($ in millions)		($ in millions)
Property and casualty insurance	$	254.8	$	221.3	15.1	%
Marine, aviation and energy insurance	103.2		153.6		(32.8	)%
Financial and professional lines insurance	104.1		106.0		(1.8	)%
Total	$	462.1	$	480.9	(3.9	)%

The increase in gross written premiums in property and casualty insurance is largely attributable to growth in our programs and U.S. casualty business lines. The decrease in gross written premiums in marine, aviation and energy insurance is largely due to increased competition in 2015, in particular in marine and energy liability and energy physical damage, combined with favorable prior-year premium adjustments in the comparative period.

Losses and loss adjustment expenses. The loss ratio for the quarter increased to 71.6% compared to 62.9% for the three months ended June 30, 2014, due to $15.0 million of fire and weather-related losses in the U.S., $20.0 million of energy-related losses and a $5.0 million train derailment loss. Prior year reserve releases increased from $3.4 million in the second quarter of 2014 to $7.0 million in the current period. The loss ratio for the current quarter has also been adversely affected by $9.5 million of catastrophe losses largely associated with U.S. weather-related events while the comparative period in 2014 experienced $10.2 million of U.S. weather-related events.

The reserve releases in the current and prior quarter were predominantly from our property and casualty lines offsetting adverse development in other marine, aviation and energy lines of business. Further information relating to the movement of prior year reserves is found below under “Reserves for Losses and Loss Adjustment Expenses.”

Policy acquisition, general and administrative expenses. Amortization of deferred policy acquisition costs for the three months ended June 30, 2015 increased to 18.7% of net premiums earned compared to 17.5% in the second quarter of 2014 due to decreased premiums in our marine, aviation and energy insurance and increased premiums in our property and casualty insurance and the corresponding change in commission rates. Our general and administrative expenses increased marginally by $5.9 million to $45.2 million for the three months ended June 30, 2015 from $51.1 million in the second quarter of 2014 due to growth in our U.S. business. The expense ratio increased by 0.6 percentage points overall.

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Results of Operations for the Six Months EndedJune 30, 2015 Compared to the Six Months EndedJune 30, 2014

The following is a discussion and analysis of our consolidated results of operations for the six months ended June 30, 2015 and 2014, starting with a summary of our consolidated results and followed by a segmental analysis.

Total Income Statement

Our statements of operations consolidate the underwriting results of our two business segments and include certain other revenue and expense items that are not allocated to segments.

Gross written premiums. Gross written premiums increased by $7.2 million, or 0.4%, in the first half of 2015 compared to the same period in 2014. Premiums from our reinsurance segment decreased by 3.3% mainly attributable to the impact of planned reductions in written premiums for our property catastrophe business line, commutations in our casualty reinsurance business lines offset by new business written in our other property and specialty reinsurance business lines, specifically our pro rata, credit and surety and agriculture business lines. Gross written premiums in casualty reinsurance decreased primarily due to reductions in prior year premium estimates and planned reductions in some casualty lines. Our insurance segment’s premiums increased by 3.7% principally from our property and casualty insurance lines due mainly to continued higher contribution from all of our U.S. teams, specifically U.S. casualty, programs and U.S. environmental business lines. The decrease in gross written premiums in marine, aviation and energy insurance is largely due to lower production in our marine and energy liability and energy physical damage accounts due to challenging market conditions including increased competition combined with favorable prior-year premium adjustments in the comparative period.

The table below shows our gross written premiums for each segment for the six months ended June 30, 2015 and 2014, and the percentage change in gross written premiums for each segment:

Business Segment	Six Months Ended June 30, 2015		Six Months Ended June 30, 2014		% increase/(decrease)
	($ in millions)		($ in millions)
Reinsurance	$	745.5	$	770.6	(3.3	)%
Insurance	896.5		864.2		3.7	%
Total	$	1,642.0	$	1,634.8	0.4	%

Ceded reinsurance. Total reinsurance ceded for the first half of 2015 of $234.4 million decreased by $16.5 million from the first half of 2014. The ceded reinsurance premiums decreased as a percentage of gross written premiums from 15.3% in the first half of 2014 to 14.3% in the first half of 2015 following our strategy to retain more risk within the group.

Net premiums earned. Net premiums earned in the first six months of 2015 increased by 1.7% from the first six months of 2014 consistent with the increase in gross written premiums and reduction in ceded premiums in the period.

Losses and loss adjustment expenses. The loss ratio for the first six months of 2015 increased by 2.5 percentage points from 52.9% in the first six months of 2014 to 55.4% for the first six months of 2015.

In the reinsurance segment, the loss ratio for the six months ended June 30, 2015 was 42.8% compared to 43.2% in the equivalent period in 2014. We experienced lower current year catastrophe losses compared to 2014 but this was partially offset by lower prior year reserve releases. In the first half of 2015, we experienced $10.1 million of natural catastrophe losses comprising $6.9 million of losses associated with North American weather-related events and $3.2 million of other losses associated predominantly with European and Australian storms. The comparable period in 2014 experienced $17.4 million of losses comprising $9.4 million of losses associated with U.S. storms and $8.0 million of losses associated with Japanese snowstorms. Reserve releases in our reinsurance segment decreased from $49.6 million in the first half of 2014 to $37.3 million in the current period.

In the insurance segment, the loss ratio of 64.9% for the first half of 2015 increased compared to 61.2% for the comparable period in 2014 due to a number of large losses in the year including $15.0 million of fire and weather-related losses in the U.S., $20.0 million of energy-related losses and a $5.0 million train derailment loss partially offset by higher reserve releases. The loss ratio for the first six months of 2015 was adversely affected by $15.3 million of catastrophe losses associated with U.S. weather-related events while losses for the first half of 2014 included $15.3 million of catastrophe losses related to U.S. and U.K. weather-related events. There has been a $10.9 million increase in prior year reserve releases from $10.4 million in the first half of 2014 to $21.3 million in the current period.

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We monitor the loss ratio as a measure of relative underwriting performance where a lower ratio represents a better result than a higher ratio. The loss ratios for our two business segments for the six months ended June 30, 2015 and 2014 were as follows:

Business Segment	Six Months Ended June 30, 2015		Six Months Ended June 30, 2014
Reinsurance	42.8	%	43.2	%
Insurance	64.9	%	61.2	%
Total Loss Ratio	55.4	%	52.9	%

We also present, in the tables below, loss ratios including and excluding the impact from catastrophe losses to aid in the analysis of the underlying performance of our segments. For this purpose, we have defined the major 2015 catastrophe losses as losses associated with storms in the U.S. We have defined major 2014 catastrophe losses as losses associated with U.S. storms, Japan snowstorms and flood losses in the U.K.

The underlying changes in loss ratios by segment are shown in the tables below for the six months ended June 30, 2015 and 2014. The total loss ratio represents the calendar year U.S. GAAP loss ratio. The current year adjustments represent the effect on the loss ratio of net claims and reinstatement premiums, if applicable, from catastrophe loss events.

For the Six Months Ended June 30, 2015	Total Loss Ratio		Current Year Adjustments		Loss Ratio Excluding Current Year Adjustments
Reinsurance	42.8	%	(2.0	)%	40.8	%
Insurance	64.9	%	(2.2	)%	62.7	%
Total	55.4	%	(2.1	)%	53.3	%

For the Six Months Ended June 30, 2014	Total Loss Ratio		Current Year Adjustments		Loss Ratio Excluding Current Year Adjustments
Reinsurance	43.2	%	(3.2	)%	40.0	%
Insurance	61.2	%	(2.4	)%	58.8	%
Total	52.9	%	(2.8	)%	50.1	%

Reserve releases in our reinsurance segment decreased from $49.6 million in the first half of 2014 to $37.3 million in the current period. The insurance segment had a $10.4 million reserve release in the first half of 2014 compared to a $21.3 million reserve release in the first half of 2015. Refer to “Reserves for Losses and Loss Adjustment Expenses” below for a description of the key elements giving rise to these reserve releases.

Expense ratio. We monitor the expense ratio as a measure of the cost effectiveness of our amortization of deferred policy acquisition costs and, general, administrative and corporate expenses. The table below splits the net expense ratio between the amortized deferred policy acquisition costs, general, administrative and corporate expenses and the effect of reinsurance for each of the six months ended June 30, 2015 and 2014:

	Six Months Ended June 30, 2015						Six Months Ended June 30, 2014
Ratios Based on Gross Earned Premium	Reinsurance		Insurance		Total		Reinsurance		Insurance		Total
Policy acquisition expense ratio	18.8	%	15.5	%	16.8	%	17.6	%	15.5	%	16.4	%
General and administrative expense ratio(1)	12.3		12.0		14.2		12.1		12.5		15.2
Gross expense ratio	31.1		27.5		31.0		29.7		28.0		31.6
Effect of reinsurance	2.1		6.1		4.8		1.3		6.1		4.4
Total net expense ratio	33.2	%	33.6	%	35.8	%	31.0	%	34.1	%	36.0	%

⁽¹⁾  The total group general and administrative expense ratio includes corporate expenses.

Policy acquisition expenses have increased by $12.5 million in the first half of 2015 due to changes in the mix of business written in our reinsurance segment towards more other property and specialty reinsurance and commutation adjustments in our specialty lines which reduced net earned premiums without any equivalent reduction in commissions.

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General, administrative and corporate expenses increased marginally by $6.8 million for the first half of 2015 compared to the first half of 2014. Corporate expenses in the first half of 2014 included $8.3 million of non-recurring corporate expenses associated with the cost of defending the unsolicited approach by Endurance. The increase in expenses excluding the costs of defending the unsolicited approach by Endurance, is due to fair value adjustment on equity compensation as well as expenses related to the recruitment of senior underwriters in our insurance segment.

Net investment income. Net investment income for the first half of 2015 was $94.1 million, a decrease of 1.6% compared to $95.6 million in the first half of 2014 due primarily to a reduction in yield for our fixed income portfolio partially offset by growth in equity dividends.

Change in fair value of derivatives. In the six months ended June 30, 2015, we recorded a loss of $3.4 million (2014 — loss of $5.4 million) in respect of our interest rate swaps due to declining interest rates and a loss of $2.4 million (2014 — gain of $1.9 million) in respect of foreign exchange contracts not designated as hedging instruments, and a loss of $2.7 million (2014 — $Nil) in respect of foreign exchange contracts designated as hedging instruments.

Income before tax. In the six months ended June 30, 2015, income before tax was $184.3 million (2014 — $261.2 million) comprising the amounts set out in the table below:

	Six Months Ended June 30, 2015			Six Months Ended June 30, 2014
	($ in millions)
Underwriting income	$	134.7		$	171.0
Corporate expenses	(29.3		)	(38.8		)
Other income	1.9			1.9
Net investment income	94.1			95.6
Change in fair value of derivatives	(5.8		)	(3.5		)
Change in fair value of loan notes issued by variable interest entities	(6.2		)	(6.0		)
Realized and unrealized investment gains	70.9			52.5
Realized and unrealized investment (losses)	(43.3		)	(7.6		)
Net realized and unrealized foreign exchange losses	(18.0		)	10.8
Interest expense	(14.7		)	(14.7		)
Income before tax	$	184.3		$	261.2

Taxes. Income tax expense for the six months ended June 30, 2015 was $7.3 million (2014 — $10.0 million) equating to an estimated effective tax rate of 4.0% (2014 — 3.8%). The effective tax rate represents an estimate of the tax rate which will apply to our pre-tax income for 2015 including adjustments to prior period estimates. The effective tax rate for the year is subject to revision in future periods if circumstances change and depends on the relative profitability of those parts of business underwritten in Bermuda (where the rate of tax on corporate profits is zero), the U.K. (where the corporate tax rate decreased from 23% to 21% effective April 1, 2014) and the U.S. (where the corporate tax rate is 34%).

Net income after tax. Net income after tax for the six months ended June 30, 2015 was $177.0 million, equivalent to basic earnings per share of $2.55 adjusted for the $18.9 million preference share dividends and $0.5 million non-controlling interest. Net income after tax for the six months ended June 30, 2014 was $251.2 million, equivalent to basic earnings per ordinary share of $3.55, adjusted for the $18.9 million preference share dividends and $0.1 million non-controlling interest. Fully diluted earnings per ordinary share were $2.50 for the six months ended June 30, 2015 compared to $3.48 for the equivalent period in 2014.

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Investment gains. Realized and unrealized investment gains for the six months ended June 30, 2015 were $27.6 million (2014 — $44.9 million) comprising the amounts set out in the table below:

	Six Months Ended June 30, 2015			Six Months Ended June 30, 2014
	($ in millions)
Available for sale:
Fixed income maturities — gross realized gains	$	7.3		$	6.4
Fixed income maturities — gross realized (losses)	(1.1		)	(4.5		)
Equity securities — gross realized gains	31.9			5.5
Equity securities — gross realized (losses)	(3.0		)	—
Total other-than-temporary impairments	—			(0.7		)
Trading:
Fixed income securities — gross realized gains	3.3			4.7
Fixed income securities — gross realized (losses)	(2.6		)	(2.2		)
Equity securities — gross realized gains	28.4			1.7
Equity securities — gross realized (losses)	(13.1		)	(0.2		)
Catastrophe bonds	(0.8		)	—
Net change in gross unrealized gains	(22.7		)	34.2
Total realized and unrealized investment gains	$	27.6		$	44.9

Other-than-temporary impairments. A security is impaired when its fair value is below its amortized cost. We review our aggregate investment portfolio, including equities, on an individual security basis for potential OTTI each quarter based on criteria including issuer-specific circumstances, credit ratings actions and general macro-economic conditions. The total OTTI charge for the six months ended June 30, 2015 was $Nil (2014 — $0.7 million). For a more detailed description of OTTI, please refer to Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in the Company’s 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission.

Other comprehensive income/(loss). Total other comprehensive loss was $115.8 million (2014 — income of $67.8 million), net of taxes, for the six months ended June 30, 2015. This is comprised of a $44.9 million net unrealized loss on the available for sale investment portfolio (2014 — $52.0 million net unrealized gain) attributable to the impact of lower interest rates on our bond portfolios, a $31.3 million reclassification of net realized gains to net income (2014 — $2.2 million reclassified net realized gains), net unrealized losses in foreign currency translation of $42.3 million (2014 — $18.0 million net unrealized gains) and a net unrealized gain on hedged derivative contracts of $2.7 million (2014 — $Nil).

Non-controlling interest. In the six months ended June 30, 2015, we recorded an increase of $0.5 million (2014 — increase of $0.1 million) in the amount owed to the non-controlling interest in respect of Aspen Risk Management Limited.

Dividends. The dividend on our ordinary shares increased from $0.20 per ordinary share to $0.21 per ordinary share on April 22, 2015. The dividend on our ordinary shares increased from $0.18 per ordinary share to $0.20 per ordinary share on April 23, 2014. Dividends paid on our ordinary and preference shares in the six months ended June 30, 2015 were $25.4 million and $18.9 million, respectively (2014 — $24.8 million and $18.9 million).

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Underwriting Results by Operating Segments —Half Year

Please refer to the tables in Note 5 in our unaudited condensed consolidated financial statements of this report for a summary of gross and net written and earned premiums, underwriting results and combined ratios and reserves for our two business segments for the six months ended June 30, 2015 and 2014. The contributions of each segment to gross written premiums in the six months ended June 30, 2015 and 2014 were as follows:

	Gross Written Premiums
Business Segment	Six Months Ended June 30, 2015		Six Months Ended June 30, 2014
	(% of total gross written premiums)
Reinsurance	45.4	%	47.1	%
Insurance	54.6		52.9
Total	100.0	%	100.0	%

	Gross Written Premiums
Business Segment	Six Months Ended June 30, 2015		Six Months Ended June 30, 2014
	($ in millions)
Reinsurance	$	745.5	$	770.6
Insurance	896.5		864.2
Total	$	1,642.0	$	1,634.8

Reinsurance

Gross written premiums. Gross written premiums in our reinsurance segment decreased by 3.3% compared to the six months ended June 30, 2014. The table below shows our gross written premiums for each line of business for the six months ended June 30, 2015 and 2014, and the percentage change in gross written premiums for each such line:

Lines of Business	Six Months Ended June 30, 2015		Six Months Ended June 30, 2014		% increase/ (decrease)
	($ in millions)		($ in millions)
Property catastrophe reinsurance	$	221.1	$	260.4	(15.1	)%
Other property reinsurance(1)	193.9		179.2		8.2	%
Casualty reinsurance	163.7		173.9		(5.9	)%
Specialty reinsurance(1)	166.8		157.1		6.2	%
Total	$	745.5	$	770.6	(3.3	)%

(1) The 2014 quarterly Reinsurance segment disclosures have been re-presented to include Engineering within Specialty Reinsurance (previously classified within Other Property Reinsurance) to be consistent with the 2015 quarterly disclosures.

The decrease in our reinsurance premiums is mainly attributable to the impact of planned reductions in written premiums from more challenging market conditions in our property catastrophe business offset by new business written in our other property reinsurance and specialty reinsurance business lines, specifically our pro rata, credit and surety and agriculture business lines. Gross written premiums in casualty reinsurance decreased primarily due to reductions in prior year premium estimates and planned reductions in some casualty lines.

Losses and loss adjustment expenses. The loss ratio for the six months ended June 30, 2015 was 42.8% compared to 43.2% in the equivalent period in 2014. The loss ratio in 2015 experienced lower current year catastrophe losses compared to 2014 but was offset by a $5.1 million energy loss and lower prior year reserve releases. In the first half of 2015, we experienced $10.1 million of natural catastrophe losses comprising $6.9 million of losses associated with North American weather-related events and $3.2 million of other losses associated predominantly with European and Australian storms. The comparable period in 2014 experienced $17.4 million of losses comprising $9.4 million of losses associated with U.S. storms and $8.0 million of losses associated with Japanese snowstorms. Reserve releases in our reinsurance segment decreased from $49.6 million in the first half of 2014 to $37.3 million in the current period. Reserve releases for the current period were across all business lines. Further information relating to the movement of prior year reserves is found below under “Reserves for Losses and Loss Adjustment Expenses.”

Policy acquisition, general and administrative expenses. Amortization of deferred policy acquisition costs were $103.8 million for the six months ended June 30, 2015 equivalent to 20.1% of net premiums earned which is higher than the equivalent

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period in 2014 of $100.2 million or 18.4% of net premiums earned mainly attributable to increased ceded reinsurance costs reducing net premiums earned but also due to changes in the mix of business written and commutation adjustments in our specialty lines which reduced net earned premiums without any equivalent reduction in commissions.

The general and administrative expense ratio of 13.1% increased from 12.6% for the same period in 2014 due to the impact of higher ceded costs on net premiums earned as the actual amount of expense decreased from $68.6 million to $67.8 million.

Insurance

Gross written premiums. Gross written premiums in our insurance segment for the six months ended June 30, 2015 increased by 3.7% from $864.2 million in the equivalent period in 2014. The table below shows our gross written premiums for each line of business for the six months ended June 30, 2015 and 2014, and the percentage change in gross written premiums for each line:

Lines of Business	Six Months Ended June 30, 2015		Six Months Ended June 30, 2014		% increase/ (decrease)
	($ in millions)		($ in millions)
Property and casualty insurance	$	468.2	$	397.6	17.8	%
Marine, aviation and energy insurance	234.9		285.3		(17.7	)%
Financial and professional lines insurance	193.4		181.3		6.7	%
Total	$	896.5	$	864.2	3.7	%

The increase in gross written premiums of our property and casualty insurance is mainly due to continued higher contribution from all of our U.S. teams, specifically U.S. casualty, programs and U.S. environmental business lines. The decrease in gross written premiums in marine, aviation and energy insurance is largely due to lower production in our marine and energy liability and energy property damage accounts due to the repositioning of certain accounts and difficult market conditions including increased competition combined with favorable prior-year premium adjustments in the comparative period.

Losses and loss adjustment expenses. The loss ratio of 64.9% for the first half of 2015 increased compared to 61.2% for the comparable period in 2014 due to a number of large losses in the year including $15.0 million of fire and weather-related losses in the U.S., $20.0 million of energy-related losses and a $5.0 million train derailment loss, partially offset by higher reserve releases. The loss ratio for the first six months of 2015 was adversely affected by $15.3 million of catastrophe losses associated with U.S. weather-related events while losses for the first half of 2014 included $15.3 million of catastrophe losses related to U.S. and U.K. weather-related events. There was a $10.9 million increase in prior year reserve releases from $10.4 million in the first half of 2014 to $21.3 million in the current period.

The reserve releases in the six-month period were principally from our property and casualty lines, most notably excess casualty, U.K. commercial and U.S. property business lines offsetting adverse development in other marine, aviation and energy lines of business. The release in the comparative period in 2014 was due primarily to better than expected development from property and casualty, aviation and marine hull lines offsetting adverse development in other marine, aviation and energy lines of business. Further information relating to the movement of prior year reserves is found below under “Reserves for Losses and Loss Adjustment Expenses.”

Policy acquisition, general and administrative expenses. Amortization of deferred policy acquisition costs for the six months ended June 30, 2015 was unchanged at 18.9% of net premiums earned compared to 18.9% in the comparable period. Our general and administrative expenses in the first half of 2015 increased by $3.5 million to $100.5 million from $97.0 million in the comparable period of 2014 largely due to growth in our U.S. business.

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Cash and investments

As at June 30, 2015 and December 31, 2014, total cash and investments were $8.5 billion and $8.6 billion, respectively. The composition of our investment portfolio is summarized below:

	As at June 30, 2015				As at December 31, 2014
	Estimated Fair Value		Percentage of Total Cash and Investments		Estimated Fair Value		Percentage of Total Cash and Investments
	($ in millions except for percentages)
Fixed income securities — available for sale
U.S. government	$	1,074.6	12.2	%	$	1,094.4	12.6	%
U.S. agency	182.0		2.1		197.4		2.3
Municipal	29.5		0.4		31.5		0.4
Corporate	2,420.8		27.4		2,319.4		26.9
Non-U.S. government-backed corporate	78.3		0.8		78.0		0.9
Foreign government	661.7		7.5		665.7		7.7
Asset-backed	138.7		1.7		143.5		1.7
Non-agency commercial mortgage-backed	35.6		0.5		44.8		0.5
Agency mortgage-backed	1,008.5		12.5		1,055.3		12.3
Total fixed income securities — available for sale	$	5,629.7	65.1	%	$	5,630.0	65.3	%
Fixed income securities — trading
U.S. government	3.4		0.1		—		—
U.S. agency	—		—		0.2		—
Municipal	0.5		—		1.1		—
Corporate	540.1		6.5		529.8		6.2
Foreign government	133.8		1.6		140.1		1.6
Asset-backed	19.7		0.2		14.7		0.2
Bank loans	80.2		1.0		85.1		1.0
Total fixed income securities — trading	$	777.7	9.4	%	$	771.0	9.0	%
Total other investments	9.5		0.1		8.7		0.1
Total catastrophe bonds — trading	32.3		0.4		34.8		0.4
Total equity securities — available for sale	—		—		109.9		1.3
Total equity securities — trading	729.3		8.5		616.0		7.2
Total short-term investments — available for sale	184.1		2.1		258.3		3.0
Total short-term investments — trading	1.1		—		0.2		—
Total cash and cash equivalents	1,148.4		14.4		1,178.5		13.7
Total cash and investments	$	8,512.1	100.0	%	$	8,607.4	100.0	%

Fixed Income Securities. As at June 30, 2015, the average credit quality of our fixed income portfolio was “AA-,” with 89.4% of the portfolio rated “A” or higher. As at December 31, 2014, the average credit quality of our fixed income portfolio was “AA-,” with 88.3% of the portfolio rated “A” or higher. Where the credit ratings were split between the two main rating agencies, S&P and Moody’s, the lowest rating was used. Our fixed income portfolio duration as at June 30, 2015 was 3.53 years compared to 3.50 years as at December 31, 2014 excluding the impact of the interest rate swaps, and 3.38 years including the impact of interest rate swaps (December 31, 2014 — 3.29 years).

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Mortgage-Backed Securities. The following table summarizes the fair value of our mortgage-backed securities by rating and class as at June 30, 2015:

	AAA		AA and Below		Total
	($ in millions)
Agency	$	—	$	1,008.5	$	1,008.5
Non-agency commercial	11.5		24.1		35.6
Total mortgage-backed securities	$	11.5	$	1,032.6	$	1,044.1

Our mortgage-backed portfolio is supported by loans diversified across a number of geographic and economic sectors.

Equity Securities. Equity securities are comprised of U.S. and foreign equity securities and in prior periods were classified as available for sale or trading. As a result of rebalancing equity investments across subsidiary company balance sheets, a portion of equities were sold that were classified as available for sale, with a commensurate purchase of equities designated as trading securities. As a result, there was a realized investment gain of $28.9 million on this sale. The total investment return from the available for sale and trading equity portfolios for the three and six months ended June 30, 2015 and 2014 was as follows:      

	For the Three Months Ended				For the Six Months Ended
Available for Sale Equity Portfolio	June 30, 2015		June 30, 2014		June 30, 2015			June 30, 2014
	($ in millions)				($ in millions)
Dividend income	$	0.1	$	1.5	$	0.1		$	4.7
Net realized investment gains	—		1.3		31.5			13.8
Change in net unrealized gains/(losses), gross of tax	—		0.6		(31.5		)	9.4
Net realized foreign exchange (losses)	—		—		(5.5		)	(1.4		)
Net unrealized foreign exchange gains	—		—		4.2			0.6
Total investment return/(loss) from the available for sale equity portfolio	$	0.1	$	3.4	$	(1.2	)	$	27.1

	For the Three Months Ended					For the Six Months Ended
Trading Equity Portfolio	June 30, 2015			June 30, 2014		June 30, 2015			June 30, 2014
	($ in millions)					($ in millions)
Dividend income	$	5.7		$	3.9	$	11.9		$	5.5
Net realized investment gains	11.4			1.0		24.9			0.5
Change in net unrealized (losses)/gains, gross of tax	(25.3		)	1.6		(21.9		)	16.2
Net realized foreign exchange (losses)	(5.3		)	—		(10.4		)	(0.4		)
Net unrealized foreign exchange gains	14.8			0.3		2.9			1.7
Total investment return from the trading equity portfolio	$	1.3		$	6.8	$	7.4		$	23.5

Interest rate swaps. In 2014 we decided to let our interest rate swap program roll-off and not renew maturing positions. This decision was made after an extensive reassessment of the costs of maintaining an interest rate swap program in a steep yield curve environment. In addition, the continued uncertainty in the global economy, weak oil prices and low inflation make it difficult to gage the timing and speed of interest rate rises by the Federal Reserve. As at June 30, 2015, our interest rate swaps program was a notional $951.3 million consistent with the $951.3 million at December 31, 2014, as no swaps rolled off. Our interest rate swaps program continues to partially mitigate the negative impact of rising interest rates on the market value of our fixed income portfolio. For the six months ended June 30, 2015, there was a charge in respect of the interest rate swaps of $3.4 million which consisted of a $5.4 million mark to market gain less $8.8 million of net interest payments. As at June 30, 2015, our interest rate swap position reduced the duration of the fixed-income portfolio from 3.53 years to 3.38 years and the duration of the aggregate portfolio from 2.88 years to 2.78 years.

European Fixed Income and Equity Exposures. As at June 30, 2015, we had $1,048.9 million, or 12.3% of our total cash and investments, invested in securities issued by European issuers, including the U.K. Our European exposures consisted of sovereigns, agencies, government guaranteed bonds, covered bonds, corporate bonds and equities. We have no exposure to the sovereign debt of Greece, Ireland, Italy, Portugal or Spain (“GIIPS”), and de minimis holdings of Spanish corporate bonds.

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We manage our European fixed income exposures by proactively adapting our investment guidelines to our views on the European debt crisis. We continue to prohibit purchases of GIIPS sovereign (including Belgium) and guaranteed debt, peripheral European bank debt and corporate bonds issued by companies domiciled in GIIPS countries.

In May 2014, we amended our restrictions on purchases of bonds issued by U.K and non-peripheral European corporate financial issuers to allow the purchase of those issued by select issuers.

The tables below summarize our European holdings by country (Eurozone and non-Eurozone), rating and sector as at June 30, 2015. Equity investments included in the table below are not rated (“NR”). Where the credit ratings were split between the two main rating agencies, S&P and Moody’s, the lowest rating was used.

	As at June 30, 2015 by Ratings
Country	AAA		AA		A		BBB		BB		NR		Market Value		Market Value %
	($ in millions except percentages)
Austria	$	—	$	16.2	$	—	$	—	$	—	$	—	$	16.2	1.5	%
Belgium	—		—		16.8		—		—		10.7		27.5		2.6
Denmark	6.1		—		—		—		—		8.8		14.9		1.4
Finland	—		19.2		—		—		—		6.9		26.1		2.5
France	—		39.5		16.9		0.8		—		23.3		80.5		7.7
Germany	43.9		19.6		74.0		4.3		—		12.0		153.8		14.7
Ireland	—		—		—		—		—		0.3		0.3		—
Latvia	—		—		1.7		—		—		—		1.7		0.2
Lithuania	—		—		3.0		—		—		—		3.0		0.3
Luxembourg	—		—		—		0.3		1.0		—		1.3		0.1
Netherlands	—		57.8		5.9		8.7		1.5		9.6		83.5		8.0
Norway	4.5		15.0		—		—		—		—		19.5		1.9
Poland	—		—		2.5		—		—		—		2.5		0.2
Sweden	3.0		17.2		—		1.0		—		16.4		37.6		3.6
Switzerland	10.5		32.0		24.7		7.7		—		63.8		138.7		13.2
United Kingdom	16.5		213.9		67.0		41.4		3.6		99.4		441.8		42.1
Total European Exposures	$	84.5	$	430.4	$	212.5	$	64.2	$	6.1	$	251.2	$	1,048.9	100.0	%

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	As at June 30, 2015 by Sectors
Country	Sovereign		ABS		Government Guaranteed Bonds		Agency		Local Government		Corporate Financial Issuers		Corporate Non- Financial Issuers		Covered Bonds		Equity		Bank Loans		Market Value		Unrealized Pre-tax Gain/Loss
	($ in millions except percentages)
Austria	$	7.3	$	—	$	8.9	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	16.2	$	0.2
Belgium	—		—		—		—		—		—		16.8		—		10.7		—		27.5		2.4
Denmark	—		—		—		—		6.1		—		—		—		8.8		—		14.9		2.5
Finland	10.4		—		—		—		8.8		—		—		—		6.9		—		26.1		1.0
France	3.2		—		9.2		24.0		—		1.3		19.5		—		23.3		—		80.5		4.5
Germany	7.7		—		31.4		9.9		12.6		—		80.2		—		12.0		—		153.8		2.5
Ireland	—		—		—		—		—		—		—		—		0.3		—		0.3		—
Latvia	1.7		—		—		—		—		—		—		—		—		—		1.7		0.1
Lithuania	3.0		—		—		—		—		—		—		—		—		—		3.0		0.1
Luxembourg	—		—		—		—		—		—		0.3		—		—		1.0		1.3		—
Netherlands	7.5		—		—		28.5		—		4.8		31.6		—		9.6		1.5		83.5		(1.6		)
Norway	—		—		—		19.5		—		—		—		—		—		—		19.5		0.8
Poland	2.5		—		—		—		—		—		—		—		—		—		2.5		0.1
Sweden	—		—		—		8.6		3.0		9.6		—		—		16.4		—		37.6		0.9
Switzerland	6.8		—		—		—		—		16.5		47.9		3.7		63.8		—		138.7		6.8
United Kingdom	211.7		1.0		4.6		—		—		6.1		102.0		13.4		99.4		3.6		441.8		4.5
Total European Exposures	$	261.8	$	1.0	$	54.1	$	90.5	$	30.5	$	38.3	$	298.3	$	17.1	$	251.2	$	6.1	$	1,048.9	$	24.8

Reserves for Losses and Loss Adjustment Expenses

As at June 30, 2015, we had total net loss and loss adjustment expense reserves of $4,478.6 million (December 31, 2014 — $4,400.8 million). This amount represented our selected reserves for the ultimate liability for payment of losses and loss adjustment expenses. The following tables analyze gross and net loss and loss adjustment expense reserves by segment as at June 30, 2015 and December 31, 2014, respectively:

	As at June 30, 2015
Business Segment	Gross		Reinsurance Recoverable			Net
	($ in millions)
Reinsurance	$	2,444.4	$	(32.8	)	$	2,411.6
Insurance	2,371.5		(304.5		)	2,067.0
Total losses and loss expense reserves	$	4,815.9	$	(337.3	)	$	4,478.6

	As at December 31, 2014
Business Segment	Gross		Reinsurance Recoverable			Net
	($ in millions)
Reinsurance	$	2,531.1	$	(37.8	)	$	2,493.3
Insurance	2,219.7		(312.2		)	1,907.5
Total losses and loss expense reserves	$	4,750.8	$	(350.0	)	$	4,400.8

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For the six months ended June 30, 2015, there was a reduction of our estimate of the ultimate net claims to be paid in respect of prior accident years of $58.6 million. An analysis of this reduction by business segment is as follows for each of the three and six months ended June 30, 2015 and 2014:

	For the Three Months Ended				For the Six Months Ended
Business Segment	June 30, 2015		June 30, 2014		June 30, 2015		June 30, 2014
	($ in millions)				($ in millions)
Reinsurance	$	24.1	$	28.4	$	37.3	$	49.6
Insurance	7.0		3.4		21.3		10.4
Total losses and loss expense reserves reductions	$	31.1	$	31.8	$	58.6	$	60.0

The key elements which gave rise to the net positive development during the three months ended June 30, 2015 were as follows:

Reinsurance. Net reserve releases were $24.1 million in the current quarter. The largest releases in the quarter were $10.3 million from other property lines following better than expected development and a $7.7 million reduction in reserves for casualty due to better than expected development.

Insurance. Net reserve releases were $7.0 million in the current quarter. The largest releases in the quarter were attributable to U.K. and U.S. property, U.K. casualty and global excess casualty. These releases were partially offset by a $9.3 million net strengthening in the marine, aviation and energy business lines.

The key elements which gave rise to the net positive development during the six months ended June 30, 2015 were as follows:

Reinsurance. Net reserve releases of $37.3 million in the period were attributable to all of our reinsurance lines. The largest releases in the six months ended June 30, 2015 were $12.2 million from other property lines due primarily to better than planned experience, $10.9 million from casualty reinsurance due to favorable development and $9.0 million from specialty reinsurance lines due to favorable development.

Insurance. Net reserve releases of $21.3 million in the period were mainly attributable to our U.S. and U.K. property, energy and excess casualty lines. These releases were partially offset by an $11.8 million net strengthening in the marine, aviation and energy business lines.

For a more detailed description see Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Critical Accounting Policies” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Reserves for Losses and Loss Adjustment Expenses,” included in our 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission.

Capital Management

The following table shows our capital structure as at June 30, 2015 compared to December 31, 2014:

	As at June 30, 2015		As at December 31, 2014
	($ in millions)
Share capital, additional paid-in capital, retained income and accumulated other comprehensive income attributable to ordinary shareholders	$	2,807.8	$	2,863.5
Preference shares (liquidation preferences net of issue costs)	555.8		555.8
Long-term debt	549.2		549.1
Loan notes issued by variable interest entities(1)	77.8		138.6
Total capital	$	3,990.6	$	4,107.0

⁽¹⁾ We do not consider the loan notes issued by VIEs to be part of our permanent capital as the noteholders have no recourse to the other assets of the Company.

As at June 30, 2015, total shareholders’ equity was $3,363.6 million compared to $3,419.3 million as at December 31, 2014. Our total shareholders’ equity as at June 30, 2015 includes three classes of preference shares with a total value as measured by their respective liquidation preferences of $555.8 million net of share issuance costs (December 31, 2014 — $555.8 million).

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On April 22, 2015, we announced a 5% increase in our quarterly dividend to our ordinary shareholders from $0.20 per ordinary share to $0.21 per ordinary share. On April 23, 2014, we announced an 11.1% increase in our normal quarterly dividend to our ordinary shareholders from $0.18 per share to $0.20 per ordinary share.

We acquired and cancelled 1,003,195 and 1,790,333 ordinary shares, respectively, in the three and six months ended June 30, 2015. The total consideration paid was $47.2 million and $83.7 million, respectively, with the average price for the three and six months ended June 30, 2015 being $47.06 and $46.74, respectively. As at June 30, 2015, we had $416.4 million remaining under our current share repurchase authorization of $500.0 million granted on February 5, 2015.

Our preference shares are classified in our balance sheet as equity but may receive a different treatment in some cases under the capital adequacy assessments made by certain rating agencies. Such securities are often referred to as “hybrids” as they have certain attributes of both debt and equity. We also monitor the ratio of the total of debt and hybrids to total capital which was 29.6% as at June 30, 2015 (December 31, 2014 — 30.8%).

Our senior notes are the only material debt issued by Aspen Holdings currently outstanding. As of June 30, 2015 and December 31, 2014 the value of the debt less amortization expenses was $549.2 million and $549.1 million, respectively. Management monitors the ratio of debt to total capital, with total capital being defined as shareholders’ equity plus outstanding debt. As at June 30, 2015, this ratio was 15.7% (December 31, 2014 — 17.0%).

In addition to the senior notes issued by Aspen Holdings, we have also reported $77.8 million of debt issued by Silverton as of June 30, 2015 (December 31, 2014 — $138.6 million). For further information relating to Silverton, refer to Note 7 of the “Notes to the Audited Consolidated Financial Statements” in the Company’s 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission.

Access to capital. Our business operations are in part dependent on our financial strength and the market’s perception thereof, as measured by total shareholders’ equity, which was $3,363.6 million as at June 30, 2015 (December 31, 2014 — $3,419.3 million). We believe our financial strength provides us with the flexibility and capacity to obtain funds through debt or equity financing. Our continuing ability to access the capital markets is dependent on, among other things, our operating results, market conditions and our perceived financial strength. We regularly monitor our capital and financial position, as well as investment and securities market conditions, both in general and with respect to Aspen Holdings’ securities. Our ordinary shares and all of our preference shares are listed on the New York Stock Exchange.

Liquidity

Liquidity is a measure of a company’s ability to generate cash flows sufficient to meet short-term and long-term cash requirements of its business operations. Management monitors the liquidity of Aspen Holdings and of each of its Operating Subsidiaries and arranges credit facilities to enhance short-term liquidity resources on a stand-by basis.

Holding Company. We monitor the ability of Aspen Holdings to service debt, to finance dividend payments to ordinary and preference shareholders and to provide financial support to the Operating Subsidiaries.

As at June 30, 2015, Aspen Holdings held $111.5 million of cash and cash equivalents (December 31, 2014 — $86.8 million) with the increase due to the receipt of dividend income from subsidiary companies less a total of $47.2 million of ordinary share repurchases in the six months ended June 30, 2015. Management considers the current cash and cash equivalents, taken together with dividends declared or expected to be declared by subsidiary companies and our credit facilities, to be sufficient to appropriately satisfy the liquidity requirements of Aspen Holdings. Aspen Holdings’ liquidity depends on dividends, capital distributions and interest payments from our Operating Subsidiaries. Aspen Holdings also has recourse to the credit facility described under “Letter of Credit Facilities” below.

The ability of our Operating Subsidiaries to pay us dividends or other distributions is subject to the laws and regulations applicable to each jurisdiction, as well as the Operating Subsidiaries’ need to maintain capital requirements adequate to maintain their insurance and reinsurance operations and their financial strength ratings issued by independent rating agencies. On October 21, 2013, and in line with usual market practice for regulated institutions, the Prudential Regulation Authority (the “PRA”), the regulatory agency which oversees the prudential regulation of insurance companies in the U.K. such as Aspen U.K., requested that it be afforded the opportunity to provide a prior “non-objection” to all future dividend payments made by Aspen U.K.   For a further discussion of the various restrictions on our ability and our Operating Subsidiaries’ ability to pay dividends, see Part I, Item 1 “Business — Regulatory Matters” in our 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission. For a more detailed discussion of our Operating Subsidiaries’ ability to pay dividends, see Note 16 of the “Notes to the Audited Consolidated Financial Statements” in our 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission.

Operating Subsidiaries. As at June 30, 2015, the Operating Subsidiaries held $986.8 million (December 31, 2014 — $1,296.2 million) in cash and short-term investments that are readily realizable securities. Management monitors the value, currency and duration of cash and investments held by the Operating Subsidiaries to ensure that they are able to meet their

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insurance and other liabilities as they become due and was satisfied that there was a comfortable margin of liquidity as at June 30, 2015 and for the foreseeable future.

On an ongoing basis, our Operating Subsidiaries’ sources of funds primarily consist of premiums written, investment income and proceeds from sales and redemptions of investments. Cash is used primarily to pay reinsurance premiums, losses and loss adjustment expenses, brokerage commissions, general and administrative expenses, taxes, interest and dividends and to purchase new investments. The potential for individual large claims and for accumulations of claims from single events means that substantial and unpredictable payments may need to be made within relatively short periods of time.

We manage these risks by making regular forecasts of the timing and amount of expected cash outflows and ensuring that we maintain sufficient balances in cash and short-term investments to meet these estimates. Notwithstanding this policy, if our cash flow forecast is incorrect, we could be forced to liquidate investments prior to maturity, potentially at a significant loss.

The liquidity of our Operating Subsidiaries is also affected by the terms of our contractual obligations to policyholders and by undertakings to certain regulatory authorities to facilitate the issue of letters of credit or maintain certain balances in trust funds for the benefit of policyholders. The following table shows the forms of collateral or other security provided in respect of these obligations and undertakings as at June 30, 2015 and December 31, 2014:

	As at June 30, 2015			As at December 31, 2014
	($ in millions, except percentages)
Regulatory trusts and deposits:
Affiliated transactions	$	978.9		$	1,086.9
Third party	2,182.1			2,183.4
Letters of credit / guarantees	710.5			778.7
Total restricted assets	$	3,871.5		$	4,049.0
Total as percent of cash and invested assets	45.5		%	47.0		%

For more information on these arrangements, see Note 19(a) of the “Notes to the Audited Consolidated Financial Statements” in our 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission.

Consolidated Cash Flows for the Six Months EndedJune 30, 2015. Total net cash flow from operations for the six months ended June 30, 2015 was $204.4 million, a decrease of $103.5 million from the comparative period in 2014. The decrease is mainly attributable to higher claims settlements and performance-related payments made the first half of 2015 in respect of 2014 compared to the first half of 2014. For the six months ended June 30, 2015, our cash flow from operations provided us with sufficient liquidity to meet our operating requirements.

Letter of Credit Facilities. On June 12, 2013, we and certain of our direct and indirect subsidiaries (collectively, the “Borrowers”) entered into an amended and restated credit agreement (the “Credit Agreement”) with various lenders and Barclays Bank PLC, as administrative agent (“Barclays”), which amends and restates the credit agreement dated as of July 30, 2010 among Aspen Holdings, the Borrowers, various lenders and Barclays. The credit facility will be used primarily for letters of credit in connection with our insurance and reinsurance businesses to finance our working capital needs and those of our subsidiaries and for other general corporate purposes. Initial availability under the credit facility is $200.0 million and we have the option (subject to obtaining commitments from acceptable lenders) to increase the facility by up to $100.0 million. The facility will expire on June 12, 2017.

As of June 30, 2015, no borrowings were outstanding under the credit facility. The fees and interest rates on the loans and the fees on the letters of credit payable by the Borrowers increase based on the consolidated leverage ratio of the Company. The fees and interest rates on the loans and the fees on the letters of credit payable by the Borrowers under the Credit Agreement are based upon the credit ratings for the Company’s long-term unsecured senior debt by S&P and Moody’s. In addition, the fees for a letter of credit vary based upon whether the applicable Borrower has provided collateral (in the form of cash or qualifying debt securities) to secure its reimbursement obligations with respect to such letter of credit.

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Under the credit facility, we must not permit (a) consolidated tangible net worth to be less than approximately $2,428.6 million plus 50% of consolidated net income and 50% of aggregate net cash proceeds from the issuance by the Company of its capital stock, in each case after January 1, 2013, (b) the ratio of our total consolidated debt to the sum of such debt plus our consolidated tangible net worth to exceed 35% or (c) any material insurance subsidiary to have a financial strength rating of less than B++ from A.M. Best. In addition, the credit facility contains other customary affirmative and negative covenants as well as certain customary events of default, including with respect to a change in control. The various affirmative and negative covenants, include, among others, covenants that, subject to various exceptions, restrict the ability of the Company and its subsidiaries to: incur indebtedness; create or permit liens on assets; engage in mergers or consolidations; dispose of assets; pay dividends or other distributions; purchase or redeem the Company’s equity securities or those of its subsidiaries and make other restricted payments; make certain investments; agree with others to limit the ability of the Company’s subsidiaries to pay dividends or other restricted payments or to make loans or transfer assets to the Company or another of its subsidiaries. In addition, the credit facility has customary events of default, including (subject to certain materiality thresholds and grace periods) payment default, failure to comply with covenants, material inaccuracy of representation or warranty, bankruptcy or insolvency proceedings, change of control and cross-default to other debt agreements. Our credit facility also contains customary provisions in respect of successor companies resulting from mergers and acquisitions assuming obligations thereunder.

On December 12, 2014, Aspen Holdings and the Borrowers entered into a first amendment to the Credit Agreement with various lenders and Barclays, which amends the Credit Agreement. Aspen Holdings has recently established, and may establish additional, special purpose entities that have issued or will issue insurance-linked securities to third-party investors (each, an “ILS Entity” and collectively, the “ILS Entities”). Accordingly, the Credit Agreement was amended, among other things, to (i) exclude ILS Entities from the definition of “Subsidiary”, (ii) permit the Borrowers to invest in ILS Entities and (iii) permit the Borrowers to engage in transactions with an ILS Entity.

On June 30, 2014, Aspen Bermuda and Citi Europe replaced an existing letter of credit facility, dated July 30, 2012, in a maximum aggregate amount of up to $950.0 million (the “LOC Facility”) comprised of two maturity tranches (Tranche I with a limit of $650.0 million and Tranche II with a limit of $300.0 million) which expired on its own terms on June 30, 2014. The LOC Facility was replaced with a new letter of credit facility in a maximum aggregate amount of up to $575.0 million (the “New LOC Facility”). Under the New LOC Facility, which will expire on June 30, 2016, Aspen Bermuda will pay to Citi Europe (a) a letter of credit fee based on the available amounts of each letter of credit and (b) a commitment fee, which varies based upon usage, on the unutilized portion of the New LOC Facility. Aspen Bermuda will also pay interest on the amount drawn by any beneficiary under the New LOC Facility at a rate per annum of LIBOR plus 1% (plus reserve asset costs, if any) from the date of drawing until the date of reimbursement by Aspen Bermuda. The New LOC Facility is used to secure obligations of Aspen Bermuda to its policyholders. In addition to the New LOC Facility, we also use regulatory trusts to secure our obligations to policyholders.

The terms of a pledge agreement between Aspen Bermuda and Citi Europe (pursuant to an Assignment Agreement dated October 11, 2006) dated January 17, 2006, as amended, were also amended on June 30, 2014 to change the types of securities or other assets that are acceptable as collateral under the New LOC Facility. All other agreements relating to Aspen Bermuda’s LOC Facility, which now apply to the New LOC Facility with Citi Europe, as previously filed with the United States Securities and Exchange Commission, remain in full force and effect. As at June 30, 2015, we had $463.5 million of outstanding collateralized letters of credit under the New LOC Facility (December 31, 2014 — $463.6 million under the LOC Facility).

On December 18, 2014, Aspen Bermuda and Citi Europe entered into an amended and restated pledge agreement (“pledge agreement”) to, among other things, (i) change the types of securities or other assets that qualify as collateral pledged under the pledge agreement, (ii) provide Aspen Bermuda the right to give certain directions or entitlement orders to The Bank of New York Mellon (“BNY Mellon”), as securities intermediary, relating to the collateral without the consent of Citi Europe provided certain conditions are satisfied, (iii) provide Citi Europe, subject to the provisions set forth in the amended and restated account control agreement, dated December 18, 2014 (the “control agreement”), among Aspen Bermuda, Citi Europe and BNY Mellon, with the right and power to exercise exclusive control over the accounts set forth in the control agreement and (iv) provide a schedule of currency margins such that if the collateral is denominated in a currency other than the credit currency the collateral shall be reduced by a specified percentage.

In addition, Aspen U.K. and Aspen Bermuda have a $100.0 million secured letter of credit facility agreement with Barclays Bank PLC. As at June 30, 2015, we had $Nil of outstanding collateralized letters of credit under this facility (December 31, 2014 — $5.0 million). We did not renew this secured letter of credit facility which expired on January 31, 2015 and no new letters of credit can be issued under this facility.

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Contractual Obligations and Commitments

The following table summarizes our contractual obligations under long-term debt, operating leases (net of subleases) and reserves relating to insurance and reinsurance contracts as at June 30, 2015:

	2015		2016		2017		2018		2019		Later Years		Total
	($ in millions)
Operating Lease Obligations	$	6.8	$	9.8	$	8.5	$	7.0	$	6.1	$	12.9	$	51.1
Long-Term Debt Obligations(1)	—		—		—		—		—		550.0		550.0
Reserves for losses and LAE(2)	725.8		1,073.3		774.5		558.3		408.1		1,275.8		4,815.9
Total	$	732.6	$	1,083.1	$	783.0	$	565.3	$	414.2	$	1,838.7	$	5,417.0

⁽¹⁾  The long-term debt obligations disclosed above do not include the $29.0 million annual interest payments on our outstanding senior notes or dividends payable to holders of our preference shares or the loan notes issued by Silverton in the amount of $77.8 million.

⁽²⁾  In estimating the time intervals into which payments of our reserves for losses and loss adjustment expenses fall, as set out above, we have utilized actuarially assessed payment patterns. By the nature of the insurance and reinsurance contracts under which these liabilities are assumed, there can be no certainty that actual payments will fall in the periods shown and there could be a material acceleration or deceleration of claims payments depending on factors outside our control. This uncertainty is heightened by the relatively short time in which we have operated (relevant in particular to longer-tail lines), thereby providing limited Company-specific claims loss payment patterns. The total amount of payments in respect of our reserves, as well as the timing of such payments, may differ materially from our current estimates for the reasons set out in the Company’s 2014 Annual Report on Form 10-K under Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Critical Accounting Policies — Reserves for Losses and Loss Expenses” filed with the United States Securities and Exchange Commission.

Further information on operating leases is given in Item 2, “Properties” in our 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission.

For a discussion of derivative instruments we have entered into, please see Note 10 to our unaudited condensed consolidated financial statements for the three and six months ended June 30, 2015 included in this report.

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Effects of Inflation

Inflation may have a material effect on our consolidated results of operations by its effect on interest rates and on the cost of settling claims. The potential exists, after a catastrophe or other large property loss, for the development of inflationary pressures in a local economy as the demand for services such as construction typically surges. The cost of settling claims may also be increased by global commodity price inflation. We seek to take both these factors into account when setting reserves for any events where we think they may be material.

Our calculation of reserves for losses and loss expenses in respect of casualty business includes assumptions about future payments for settlement of claims and claims-handling expenses, such as medical treatments and litigation costs. We write casualty business in the United States, the United Kingdom and Australia and certain other territories, where claims inflation has in many years run at higher rates than general inflation. To the extent inflation causes these costs to increase above reserves established for these claims, we will be required to increase our loss reserves with a corresponding reduction in earnings. The actual effects of inflation on our results cannot be accurately known until claims are ultimately settled.

In addition to general price inflation we are exposed to a persisting long-term upwards trend in the cost of judicial awards for damages. We seek to take this into account in our pricing and reserving of casualty business.

We also seek to take into account the projected impact of inflation on the likely actions of central banks in the setting of short-term interest rates and consequent effects on the yields and prices of fixed income securities. As at June 30, 2015, we consider that although inflation is currently low, in the medium-term there is a risk that inflation, interest rates and bond yields may rise, resulting in a decrease in the market value of certain of our fixed interest investments.

Cautionary Statement Regarding Forward-Looking Statements

This report contains, and the Company may from time to time make other verbal or written, forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), that involve risks and uncertainties, including statements regarding our capital needs, business strategy, expectations and intentions. Statements that use the terms “believe,” “do not believe,” “anticipate,” “expect,” “assume,” “objective,” “target,” “could,” “would,” “should,” “plan,” “estimate,” “project,” “outlook,” “trends,” “future,” “seek,” “will,” “may,” “aim,” “likely,” “continue,” “intend,” “guidance,” “on track,” and similar expressions are intended to identify forward-looking statements. These statements reflect our current views with respect to future events and because our business is subject to numerous risks, uncertainties and other factors, our actual results could differ materially from those anticipated in the forward-looking statements. The risks, uncertainties and other factors set forth in the Company’s 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission and other cautionary statements made in this report, as well as the factors set forth below, should be read and understood as being applicable to all related forward-looking statements wherever they appear in this report.

All forward-looking statements rely on a number of assumptions, estimates and data concerning future results and events and are subject to a number of uncertainties and other factors, many of which are outside our control that could cause actual results to differ materially from such statements.

All forward-looking statements address matters that involve risks and uncertainties. Accordingly, there are or will be important factors that could cause actual results to differ materially from those indicated in these statements. We believe that these factors include, but are not limited to, those set forth under “Risk Factors” in Item 1A of our Annual Report on Form 10-K filed with the United States Securities and Exchange Commission and the following:

• our ability to successfully implement steps to further optimize the business portfolio, ensure capital efficiency and enhance investment returns;

• the possibility of greater frequency or severity of claims and loss activity, including as a result of natural or man-made (including economic and political risks) catastrophic or material loss events, than our underwriting, reserving, reinsurance purchasing or investment practices have anticipated;

• the assumptions and uncertainties underlying reserve levels that may be impacted by future payments for settlements of claims and expenses or by other factors causing adverse or favorable development, including our assumptions on inflation costs associated with long-tail casualty business which could differ materially from actual experience;

• the reliability of, and changes in assumptions to, natural and man-made catastrophe pricing, accumulation and estimated loss models;

• decreased demand for our insurance or reinsurance products and cyclical changes in the insurance and reinsurance industry;

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• the models we use to assess our exposure to losses from future natural catastrophes contain inherent uncertainties and our actual losses may differ significantly from expectations;

• our capital models may provide materially different indications than actual results;

• increased competition from existing insurers and reinsurers and from alternative capital providers and insurance-linked funds and collateralized special purpose insurers on the basis of pricing, capacity, coverage terms, new capital, binding authorities to brokers or other factors and the related demand and supply dynamics as contracts come up for renewal;

• our ability to execute our business plan to enter new markets, introduce new products and develop new distribution channels, including their integration into our existing operations;

• our acquisition strategy;

• the recent consolidation in the (re)insurance industry;

• loss of one or more of our senior underwriters or key personnel;

• changes in our ability to exercise capital management initiatives (including our share repurchase program) or to arrange banking facilities as a result of prevailing market conditions or changes in our financial results;

• changes in general economic conditions, including inflation, deflation, foreign currency exchange rates, interest rates and other factors that could affect our financial results;

• the risk of a material decline in the value or liquidity of all or parts of our investment portfolio;

• the risks associated with the management of capital on behalf of investors;

• evolving issues with respect to interpretation of coverage after major loss events;

• our ability to adequately model and price the effects of climate cycles and climate change;

• any intervening legislative or governmental action and changing judicial interpretation and judgments on insurers’ liability to various risks;

• the risks related to litigation;

• the effectiveness of our risk management loss limitation methods, including our reinsurance purchasing;

• changes in the availability, cost or quality of reinsurance or retrocessional coverage;

• changes in the total industry losses, or our share of total industry losses, resulting from past events such as the various catastrophes that occurred in 2015 and prior years and, with respect to such events, our reliance on loss reports received from cedants and loss adjustors, our reliance on industry loss estimates and those generated by modeling techniques, changes in rulings on flood damage or other exclusions as a result of prevailing lawsuits and case law;

• the impact of one or more large losses from events other than natural catastrophes or by an unexpected accumulation of attritional losses and deterioration in loss estimates;

• the impact of acts of terrorism, acts of war and related legislation;

• any changes in our reinsurers’ credit quality and the amount and timing of reinsurance recoverables;

• the continuing and uncertain impact of the current depressed lower growth economic environment in many of the countries in which we operate;

• our reliance on information and technology and third-party service providers for our operations and systems;

• the level of inflation in repair costs due to limited availability of labor and materials after catastrophes;

• a decline in our Operating Subsidiaries’ ratings with S&P, A.M. Best or Moody’s;

• the failure of our reinsurers, policyholders, brokers or other intermediaries to honor their payment obligations;

• our reliance on the assessment and pricing of individual risks by third parties;

• our dependence on a few brokers for a large portion of our revenues;

• the persistence of heightened financial risks, including excess sovereign debt, the banking system and the Eurozone crisis;

• changes in government regulations or tax laws in jurisdictions where we conduct business;

• changes in accounting principles or policies or in the application of such accounting principles or policies;

• increased counterparty risk due to the credit impairment of financial institutions; and

• Aspen Holdings or Aspen Bermuda becoming subject to income taxes in the United States or the United Kingdom.

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In addition, any estimates relating to loss events involve the exercise of considerable judgment and reflect a combination of ground-up evaluations, information available to date from brokers and cedants, market intelligence, initial tentative loss reports and other sources. Due to the complexity of factors contributing to losses and the preliminary nature of the information used to prepare estimates, there can be no assurance that our ultimate losses will remain within stated amounts.

The rate changes described in “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Outlook and Trends” reflect management’s assessment of changes in exposure-adjusted rates on renewals only. This does not include contracts with fundamental changes to terms and conditions. The calculation involves a degree of judgment in relation to comparability of contracts in the different business lines. Due to changes in assumptions underlying the pricing of contracts, the trends in premium rates reflected in our outlook and trends may not be comparable over time. The future profitability of each business line is dependent upon many factors besides the trends in premium rates.

The foregoing review of important factors should not be construed as exhaustive and should be read in conjunction with the other cautionary statements that are included in this report. We undertake no obligation to publicly update or review any forward-looking statement, whether as a result of new information, future developments or otherwise or disclose any difference between our actual results and those reflected in such statements.

If one or more of these or other risks or uncertainties materialize, or if our underlying assumptions prove to be incorrect, actual results may vary materially from what we projected. All forward-looking statements in this report reflect our current views with respect to future events and are subject to these and other risks, uncertainties and assumptions relating to our operations, results of operations, growth strategy and liquidity. All subsequent written and oral forward-looking statements attributable to us or individuals acting on our behalf are expressly qualified in their entirety by the points made above. You should specifically consider the factors identified in this report which could cause actual results to differ before making an investment decision.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

Interest rate risk. Our investment portfolio consists primarily of fixed income securities. Accordingly, our primary market risk exposure is to changes in interest rates. Fluctuations in interest rates have a direct impact on the market valuation of these securities. As interest rates rise, the market value of our fixed income portfolio falls, and the converse is also true. Our strategy for managing interest rate risk includes maintaining a high quality portfolio with a relatively short duration to reduce the effect of interest rate changes on book value. In addition, we partially mitigate our exposure to interest rates by entering into interest rate swaps with financial institution counterparties in the ordinary course of its investment activities.

As at June 30, 2015, our fixed income portfolio had an approximate duration of 3.53 years excluding the impact of interest rate swaps. The table below depicts interest rate change scenarios and the effects on our interest rate sensitive invested assets:

Effect of Changes in Interest Rates on Portfolio Given a Parallel Shift in the Yield Curve
Movement in Rates in Basis Points	-100		-50		—		50		100
	($ in millions, except percentages)
Market value $ in millions	7,025.9		6,906.1		6,786.4		6,666.6		6,546.8
Gain/(loss) $ in millions	239.6		119.8		—		(119.8	)	(239.5	)
Percentage of portfolio	3.5	%	1.8	%	—	%	(1.8	)%	(3.5	)%

Equity risk. We have invested in equity securities which had a fair market value of $729.3 million as at June 30, 2015, equivalent to 8.5% of the total of investments, cash and cash equivalents at that date (December 31, 2014 — $725.9 million, 8.5%). These equity investments are exposed to equity price risk, defined as the potential for loss in market value due to a decline in equity prices. We believe that the effects of diversification and the relatively small size of our investments in equities relative to total invested assets mitigate our exposure to equity price risk.

Foreign currency risk. Our reporting currency is the U.S. Dollar. The functional currencies of our operations are U.S. Dollars, British Pounds, Euros, Canadian Dollars, Swiss Francs, Australian Dollars and Singaporean Dollars. As at June 30, 2015, 81.6% (December 31, 2014 — 79.3%) of our cash, cash equivalents and investments were held in U.S. Dollars, 8.0% (December 31, 2014 — 8.4%) were in British Pounds and 10.4% (December 31, 2014 — 12.3%) were in other currencies. For the six months ended June 30, 2015, 17.0% (December 31, 2014 — 16.5%) of our gross premiums were written in currencies other than the U.S. Dollar and the British Pound and we expect that a similar proportion will be written in currencies other than the U.S. Dollar and the British Pound in the remainder of 2015.

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Other foreign currency amounts are re-measured to the appropriate functional currency and the resulting foreign exchange gains or losses are reflected in the statement of operations. Functional currency amounts of assets and liabilities are then translated into U.S. Dollars. The unrealized gain or loss from this translation, net of tax, is recorded as part of shareholders’ equity. The change in unrealized foreign currency translation gain or loss during the period, net of tax, is a component of comprehensive income. Both the re-measurement and translation are calculated using current exchange rates for the balance sheets and average exchange rates for the statement of operations. We may experience exchange losses to the extent our foreign currency exposure is not hedged, which in turn would adversely affect our results of operations and financial condition. Management estimates that a 10% change in the exchange rate between British Pounds and U.S. Dollars as at June 30, 2015 would have impacted our net reportable British Pound net assets by approximately $1 million for the six months ended June 30, 2015 (June 30, 2014 — approximately $5 million).

We manage our foreign currency risk by seeking to match our liabilities under insurance and reinsurance policies that are payable in foreign currencies with investments that are denominated in these currencies. This may involve the use of foreign exchange contracts from time to time. A foreign exchange contract involves an obligation to purchase or sell a specified currency at a future date at a price set at the time of the contract. Foreign exchange contracts will not eliminate fluctuations in the value of our assets and liabilities denominated in foreign currencies, but rather allow us to establish a rate of exchange for a future point in time. For a discussion of derivative instruments including foreign exchange contracts that we have entered into, please see Note 10 to our unaudited condensed consolidated financial statements for the three and six months ended June 30, 2015 included in this report.

Credit risk. We have exposure to credit risk primarily as a holder of fixed income securities. Our risk management strategy and investment policy is to invest predominantly in debt instruments of high credit quality issuers and to limit the amount of credit exposure with respect to particular ratings categories, business sectors and any one issuer. As at June 30, 2015, the average rating of fixed income securities in our investment portfolio was “AA-” (December 31, 2014 — “AA-”). We also have credit risk through exposure to our interest rate swap counterparties who are Goldman Sachs Group (senior unsecured rating of “A3” by Moody’s and “A-” by S&P) and Crédit Agricole CIB (senior unsecured rating of “A2” by Moody’s and long term issuer credit rating of “A” by S&P).

In addition, we are exposed to the credit risk of our insurance and reinsurance brokers to whom we make claims payments for our policyholders, as well as to the credit risk of our reinsurers and retrocessionaires who assume business from us. Other than fully collateralized reinsurance, the substantial majority of our reinsurers have a rating of “A” (Excellent), the third highest of fifteen rating levels, or better by A.M. Best and the minimum rating of any of our material reinsurers is “A-” (Excellent), the fourth highest of fifteen rating levels, by A.M. Best.

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

The Company, under the supervision and with the participation of the Company’s management, including the Company’s Chief Executive Officer and Chief Financial Officer, has evaluated the design and operation of the Company’s disclosure controls and procedures as of the end of the period of this report. Our management does not expect that our disclosure controls or our internal controls will prevent all errors and all fraud. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. As a result of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within the Company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns can occur because of simple error or mistake. Additionally, controls can be circumvented by the individual acts of some persons or by collusion of two or more people. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions; over time, controls may become inadequate because of changes in conditions, or the degree of compliance with the policies or procedures may deteriorate. As a result of the inherent limitations in a cost-effective control system, misstatement due to error or fraud may occur and not be detected. Accordingly, our disclosure controls and procedures are designed to provide reasonable, not absolute, assurance that the disclosure requirements are met. Based on the evaluation of the disclosure controls and procedures, the Chief Executive Officer and Chief Financial Officer have concluded that the Company’s disclosure controls and procedures were effective in ensuring that information required to be disclosed in the reports filed or submitted to the Commission under the Exchange Act by the Company is recorded, processed, summarized and reported in a timely fashion, and is accumulated and communicated to management, including the Company’s Chief Executive Officer and Chief Financial Officer, to allow timely decisions regarding required disclosure.

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Changes in Internal Control over Financial Reporting

The Company’s management has performed an evaluation, with the participation of the Company’s Chief Executive Officer and the Company’s Chief Financial Officer, of changes in the Company’s internal control over financial reporting that occurred during the three and six months ended June 30, 2015. Based upon that evaluation, the Company’s management is not aware of any change in its internal control over financial reporting that occurred during the three and six months ended June 30, 2015 that has materially affected, or is reasonably likely to materially affect, the effectiveness of the Company’s internal control over financial reporting.

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PART II

OTHER INFORMATION

Item 1. Legal Proceedings

In common with the rest of the insurance and reinsurance industry, we are also subject to litigation and arbitration in the ordinary course of our business. Our Operating Subsidiaries are regularly engaged in the investigation, conduct and defense of disputes, or potential disputes, resulting from questions of insurance or reinsurance coverage or claims activities. Pursuant to our insurance and reinsurance arrangements, many of these disputes are resolved by arbitration or other forms of alternative dispute resolution. In some jurisdictions, noticeably the U.S., a failure to deal with such disputes or potential disputes in an appropriate manner could result in an award of “bad faith” punitive damages against our Operating Subsidiaries.

While any legal or arbitration proceedings contain an element of uncertainty, we do not believe that the eventual outcome of any specific litigation, arbitration or alternative dispute resolution proceedings to which we are currently a party will have a material adverse effect on the financial condition of our business as a whole.

Item 1A. Risk Factors

There have been no significant changes in the Company’s risk factors as discussed in the Company’s Annual

Report on Form 10-K for the year ended December 31, 2014 filed with the United States Securities and Exchange Commission. Please refer to the “Cautionary Statement Regarding Forward-Looking Statements” provided elsewhere in this report.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

The following table provides information about purchases by the Company during the quarter ended June 30, 2015 of the Company’s ordinary shares.

	Total Number of Shares (or Units) Purchased	Weighted Average Price  Paid per Share (or Unit)		Total Number of Shares (or Units) Purchased as Part of Publicly Announced Plans or Programs	Maximum Number (or Approximate Dollar Value) of Shares (or Units) That May Yet Be Purchased Under the Plans or Programs ($ in millions)
April 1, 2015 to April 30, 2015	199,471	$	47.09	199,471	$	454.2
May 1, 2015 to May 31, 2015	464,000	$	46.92	464,000	$	432.4
June 1, 2015 to June 30, 2015	339,724	$	47.24	339,724	$	416.4
Total(1)	1,003,195	$	47.06	1,003,195	$	416.4

_______________

(1) During the second quarter of 2015, we repurchased 1,003,195 ordinary shares in the open market under a Rule 10b5-1 plan at an average price of $47.06 per share for a total cost of $47.2 million. We had $416.4 million remaining under our current share buyback authorization at June 30, 2015.

Item 3. Defaults Upon Senior Securities

None. 

Item 4. Mine Safety Disclosures

None.

Item 5. Other Information

We are making the following disclosure pursuant to Section 13(r) to the Securities Exchange Act 1934, as amended.

One of our affiliates reinsured an underlying insurance policy for “Al- Naser Airlines an Iraq-domiciled airline (“ANA”) and Hussain K.H. Al- Farhood and associated and subsidiary companies”. Cover under both the reinsurance policy and the underlying policy was for the period June 5, 2014 to June 4, 2015. The cover was not renewed when it expired.

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On May 21, 2015, two weeks before the cover expired, the United States Treasury Department’s Office of Foreign Assets Control (“OFAC”) designated ANA as a person whose property and interests in property are blocked pursuant to Executive Order 13224. This designation occurred as a result of ANA supplying aircraft to an Iranian airline already designated by OFAC. Aspen provided no cover in respect of this activity.

Any revenues or profits attributable to ANA’s activities were subject to the terms and conditions of the reinsurance policy. The activities for which ANA was designated as a Specially Designated National (“SDN”) were excluded from the cover provided by us. As such, we did not earn any revenue or profit related to these activities.

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Item 6. Exhibits

(a) The following sets forth those exhibits filed pursuant to Item 601 of Regulation S-K:

Exhibit Number	Description
31.1	Officer Certification of Christopher O’Kane, Chief Executive Officer of Aspen Insurance Holdings Limited, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed with this report.
31.2	Officer Certification of Scott Kirk, Chief Financial Officer of Aspen Insurance Holdings Limited, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed with this report.
32.1	Officer Certification of Christopher O’Kane, Chief Executive Officer of Aspen Insurance Holdings Limited, and Scott Kirk, Chief Financial Officer of Aspen Insurance Holdings Limited, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, submitted with this report.
101	The following financial information from Aspen Insurance Holdings Limited’s quarterly report on Form 10-Q for the quarter and six months ended June 30, 2015 formatted in XBRL: (i) Unaudited Condensed Consolidated Balance Sheets at June 30, 2015 and December 31, 2014; (ii) Unaudited Condensed Consolidated Statements of Operations and Other Comprehensive Income for the three and six months ended June 30, 2015 and 2014; (iii) Unaudited Condensed Consolidated Statements of Shareholders’ Equity for the six months ended June 30, 2015 and 2014; (iv) Unaudited Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2015 and 2014; and (v) Notes to Unaudited Condensed Consolidated Financial Statements, tagged as blocks of text and in detail.*

* As provided in Rule 406T of Regulation S-T, this information is “furnished” herewith and not “filed” for purposes of Sections 11 and 12 of the Securities Act and Section 18 of the Exchange Act. Such exhibit will not be deemed to be incorporated by reference into any filing under the Securities Act or the Exchange Act unless Aspen Holdings specifically incorporates it by reference.

71

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

			ASPEN INSURANCE HOLDINGS LIMITED
			(Registrant)
Date:	July 30, 2015	By:	/s/  Christopher O’Kane
			Christopher O’Kane
			Chief Executive Officer
Date:	July 30, 2015	By:	/s/  Scott Kirk
			Scott Kirk
			Chief Financial Officer

72

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, Christopher O’Kane, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Aspen Insurance Holdings Limited;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting.

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant's board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

	By:	/s/ Christopher O’Kane
		Name:	Christopher O’Kane
Date: July 30, 2015		Title:	Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Scott Kirk, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Aspen Insurance Holdings Limited;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting.

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

	By:	/s/ Scott Kirk
		Name:	Scott Kirk
Date: July 30, 2015		Title:	Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with this quarterly report on Form 10-Q of Aspen Insurance Holdings Limited (the “Company”) for the three months ended June 30, 2015 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Christopher O’Kane as Chief Executive Officer and Scott Kirk as Chief Financial Officer of the Company, each hereby certifies, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: July 30, 2015
By:	/s/ Christopher O’Kane
	Name:	Christopher O’Kane
	Title:	Chief Executive Officer
Date: July 30, 2015
By:	/s/ Scott Kirk
	Name:	Scott Kirk
	Title:	Chief Financial Officer

This certification accompanies the Report pursuant to § 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the Sarbanes-Oxley Act of 2002, be deemed filed by the Company for purposes of § 18 of the Securities Exchange Act of 1934, as amended.

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Segment Reporting - Summary of Gross and Net Written and Earned Premiums, Underwriting Results, Ratios and Reserves for Each of Company's Business Segments (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2015		Jun. 30, 2014		Dec. 31, 2014	Dec. 31, 2013
Underwriting Revenues
Gross written premiums	$ 722.8		$ 779.3		$ 1,642.0		$ 1,634.8
Net written premiums	644.4		686.4		1,407.6		1,383.9
Gross earned premiums	710.4		694.2		1,391.3		1,346.3
Net earned premiums	609.4		616.2		1,203.0		1,182.7
Underwriting Expenses
Losses and loss adjustment expenses	360.5		337.1		666.6		625.2
Amortization of deferred policy acquisition costs	114.1		108.9		233.4		220.9
General and administrative expenses	80.6		86.9		168.3		165.6
Underwriting income/(loss)	54.2		83.3		134.7		171.0
Corporate expenses	(14.8)		(21.9)		(29.3)		(38.8)
Net investment income	46.7		46.1		94.1		95.6
Realized and unrealized investment gains	13.5		34.6		70.9		52.5
Realized and unrealized investment losses	(28.8)		(3.3)		(43.3)		(7.6)
Change in fair value of loan notes issued by variable interest entities	(3.3)		(2.6)		(6.2)		(6.0)
Change in fair value of derivatives	2.0		(4.6)		(5.8)		(3.5)
Interest expense on long term debt	(7.3)		(7.3)		(14.7)		(14.7)
Net realized and unrealized foreign exchange (losses)	(11.6)		10.7		(18.0)		10.8
Other income	(1.2)		3.2		2.7		3.8
Other expenses	1.8		(1.2)		(0.8)		(1.9)
Income from operations before income tax	51.2		137.0		184.3		261.2
Net reserves for loss and loss adjustment expenses	$ 4,478.6		$ 4,435.8		$ 4,478.6		$ 4,435.8		$ 4,400.8	$ 4,346.2
Ratios
Loss ratio	59.20%		54.70%		55.40%		52.90%
Policy acquisition expense ratio	18.70%		17.70%		19.40%		18.70%
General and administrative expense ratio	15.70%	[1]	17.70%	[2]	16.40%	[3]	17.30%	[4]
Expense ratio	34.40%		35.40%		35.80%		36.00%
Combined ratio	93.60%		90.10%		91.20%		88.90%
Reinsurance
Underwriting Revenues
Gross written premiums	$ 260.7		$ 298.4		$ 745.5		$ 770.6
Net written premiums	238.2		286.9		680.3		729.5
Gross earned premiums	287.2		289.7		553.0		568.2
Net earned premiums	268.3		278.8		517.7		545.5
Underwriting Expenses
Losses and loss adjustment expenses	116.3		125.0		221.8		235.4
Amortization of deferred policy acquisition costs	50.4		49.8		103.8		100.2
General and administrative expenses	35.4		35.8		67.8		68.6
Underwriting income/(loss)	66.2		68.2		124.3		141.3
Net reserves for loss and loss adjustment expenses	$ 2,411.6		$ 2,584.8		$ 2,411.6		$ 2,584.8
Ratios
Loss ratio	43.30%		44.80%		42.80%		43.20%
Policy acquisition expense ratio	18.80%		17.90%		20.10%		18.40%
General and administrative expense ratio	13.20%		12.80%		13.10%		12.60%
Expense ratio	32.00%		30.70%		33.20%		31.00%
Combined ratio	75.30%		75.50%		76.00%		74.20%
Insurance
Underwriting Revenues
Gross written premiums	$ 462.1		$ 480.9		$ 896.5		$ 864.2
Net written premiums	406.2		399.5		727.3		654.4
Gross earned premiums	423.2		404.5		838.3		778.1
Net earned premiums	341.1		337.4		685.3		637.2
Underwriting Expenses
Losses and loss adjustment expenses	244.2		212.1		444.8		389.8
Amortization of deferred policy acquisition costs	63.7		59.1		129.6		120.7
General and administrative expenses	45.2		51.1		100.5		97.0
Underwriting income/(loss)	(12.0)		15.1		10.4		29.7
Net reserves for loss and loss adjustment expenses	$ 2,067.0		$ 1,851.0		$ 2,067.0		$ 1,851.0
Ratios
Loss ratio	71.60%		62.90%		64.90%		61.20%
Policy acquisition expense ratio	18.70%		17.50%		18.90%		18.90%
General and administrative expense ratio	13.30%		15.10%		14.70%		15.20%
Expense ratio	32.00%		32.60%		33.60%		34.10%
Combined ratio	103.60%		95.50%		98.50%		95.30%

[1] The general and administrative expense ratio in the total column includes corporate expenses.

[2] The general and administrative expense ratio in the total column includes corporate expenses.

[3] The general and administrative expense ratio in the total column includes corporate expenses.

[4] The general and administrative expense ratio in the total column includes corporate expenses.

XML

Fair Value Measurements - Loan Notes Issued by Variable Interest Entities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Catastrophe bonds, trading at fair value, cost	$ 32.6		$ 32.6		$ 34.4
Gross written premiums	722.8	$ 779.3	1,642.0	$ 1,634.8
Derivatives at fair value	4.1		4.1		8.0
Level 3 | Low
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross written premiums			37.7		0.0
Reserve for losses			3.8		0.0
Loan notes held by third parties	120.0		120.0		120.0
Level 3 | High
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross written premiums			39.8		40.0
Reserve for losses			$ 3.8		$ 4.6
Contract period			365 days		365 days
Loan notes held by third parties	120.0		$ 120.0		$ 120.0
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Catastrophe bonds, trading at fair value, cost	32.3		32.3
Loan notes held by third parties	76.2		76.2		70.7
Loan notes issued by variable interest entities, at fair value (classified as a current liability)	(1.6)		(1.6)		(67.9)
Net change from current period hedged transaction	(7,273.3)		(7,273.3)		(7,275.3)
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Catastrophe bonds, trading at fair value, cost	0.0		0.0
Loan notes held by third parties	0.0		0.0		0.0
Loan notes issued by variable interest entities, at fair value (classified as a current liability)	0.0		0.0		0.0
Net change from current period hedged transaction	(2,328.2)		(2,328.2)		(2,542.3)
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Catastrophe bonds, trading at fair value, cost	32.3		32.3
Loan notes held by third parties	0.0		0.0		0.0
Loan notes issued by variable interest entities, at fair value (classified as a current liability)	0.0		0.0		0.0
Net change from current period hedged transaction	(5,022.9)		(5,022.9)		(4,871.6)
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Catastrophe bonds, trading at fair value, cost	0.0		0.0
Loan notes held by third parties	76.2		76.2		70.7
Loan notes issued by variable interest entities, at fair value (classified as a current liability)	(1.6)		(1.6)		(67.9)
Net change from current period hedged transaction	77.8		77.8		138.6
Fixed income securities — Available for sale | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	5,629.7		5,629.7		5,630.0
Fixed income securities — Available for sale | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	1,554.2		1,554.2		1,550.9
Fixed income securities — Available for sale | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	4,075.5		4,075.5		4,079.1
Fixed income securities — Available for sale | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Total short-term investments — Available for sale | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	184.1		184.1		258.3
Total short-term investments — Available for sale | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		229.3
Total short-term investments — Available for sale | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	184.1		184.1		29.0
Total short-term investments — Available for sale | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Equity investments available for sale, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure					109.9
Equity investments available for sale, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure					109.9
Equity investments available for sale, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure					0.0
Equity investments available for sale, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure					0.0
Held for trading financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	777.7		777.7		805.8
Catastrophe bonds, trading at fair value, cost					34.8
Held for trading financial assets, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	44.7		44.7		36.1
Catastrophe bonds, trading at fair value, cost					0.0
Held for trading financial assets, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	733.0		733.0		769.7
Catastrophe bonds, trading at fair value, cost					34.8
Held for trading financial assets, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Catastrophe bonds, trading at fair value, cost					0.0
U.S. government | Available for sale financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	1,074.6		1,074.6		1,094.4
U.S. government | Available for sale financial assets, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	1,074.6		1,074.6		1,094.4
U.S. government | Available for sale financial assets, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
U.S. government | Available for sale financial assets, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
U.S. government | Held for trading financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	3.4		3.4		0.0
U.S. government | Held for trading financial assets, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	3.4		3.4		0.0
U.S. government | Held for trading financial assets, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
U.S. government | Held for trading financial assets, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
U.S. agency | Available for sale financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	182.0		182.0		197.4
U.S. agency | Available for sale financial assets, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
U.S. agency | Available for sale financial assets, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	182.0		182.0		197.4
U.S. agency | Available for sale financial assets, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
U.S. agency | Held for trading financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure					0.2
U.S. agency | Held for trading financial assets, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure					0.0
U.S. agency | Held for trading financial assets, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure					0.2
U.S. agency | Held for trading financial assets, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure					0.0
Municipal | Available for sale financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	29.5		29.5		31.5
Municipal | Available for sale financial assets, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Municipal | Available for sale financial assets, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	29.5		29.5		31.5
Municipal | Available for sale financial assets, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Municipal | Held for trading financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.5		0.5		1.1
Municipal | Held for trading financial assets, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Municipal | Held for trading financial assets, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.5		0.5		1.1
Municipal | Held for trading financial assets, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Corporate | Available for sale financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	2,420.8		2,420.8		2,319.4
Corporate | Available for sale financial assets, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Corporate | Available for sale financial assets, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	2,420.8		2,420.8		2,319.4
Corporate | Available for sale financial assets, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Corporate | Held for trading financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	540.1		540.1		529.8
Corporate | Held for trading financial assets, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Corporate | Held for trading financial assets, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	540.1		540.1		529.8
Corporate | Held for trading financial assets, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Foreign government | Available for sale financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	661.7		661.7		665.7
Foreign government | Available for sale financial assets, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	479.6		479.6		456.5
Foreign government | Available for sale financial assets, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	182.1		182.1		209.2
Foreign government | Available for sale financial assets, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Foreign government | Held for trading financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	133.8		133.8		140.1
Foreign government | Held for trading financial assets, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	41.3		41.3		36.1
Foreign government | Held for trading financial assets, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	92.5		92.5		104.0
Foreign government | Held for trading financial assets, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Asset-backed | Available for sale financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	138.7		138.7		143.5
Asset-backed | Available for sale financial assets, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Asset-backed | Available for sale financial assets, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	138.7		138.7		143.5
Asset-backed | Available for sale financial assets, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Asset-backed | Held for trading financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	19.7		19.7		14.7
Asset-backed | Held for trading financial assets, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Asset-backed | Held for trading financial assets, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	19.7		19.7		14.7
Asset-backed | Held for trading financial assets, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Non-agency commercial mortgage-backed | Available for sale financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	35.6		35.6		44.8
Non-agency commercial mortgage-backed | Available for sale financial assets, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Non-agency commercial mortgage-backed | Available for sale financial assets, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	35.6		35.6		44.8
Non-agency commercial mortgage-backed | Available for sale financial assets, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Agency mortgage-backed | Available for sale financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	1,008.5		1,008.5		1,055.3
Agency mortgage-backed | Available for sale financial assets, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Agency mortgage-backed | Available for sale financial assets, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	1,008.5		1,008.5		1,055.3
Agency mortgage-backed | Available for sale financial assets, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Bank loans | Held for trading financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	80.2		80.2		85.1
Bank loans | Held for trading financial assets, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Bank loans | Held for trading financial assets, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	80.2		80.2		85.1
Bank loans | Held for trading financial assets, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Short-term investments trading, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	1.1		1.1		0.2
Short-term investments trading, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.1
Short-term investments trading, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	1.1		1.1		0.1
Short-term investments trading, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Equity investments trading, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	729.3		729.3		616.0
Equity investments trading, at fair value | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	729.3		729.3		616.0
Equity investments trading, at fair value | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Equity investments trading, at fair value | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Foreign Exchange Contracts | Derivatives at fair value, assets | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives at fair value	4.1		4.1		7.9
Foreign Exchange Contracts | Derivatives at fair value, assets | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives at fair value	0.0		0.0		0.0
Foreign Exchange Contracts | Derivatives at fair value, assets | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives at fair value	4.1		4.1		7.9
Foreign Exchange Contracts | Derivatives at fair value, assets | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives at fair value	0.0		0.0		0.0
Foreign Exchange Contracts | Liabilities under derivative contracts — foreign exchange contracts | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities under derivative contracts, fair value	(6.2)		(6.2)		(14.3)
Foreign Exchange Contracts | Liabilities under derivative contracts — foreign exchange contracts | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities under derivative contracts, fair value	0.0		0.0		0.0
Foreign Exchange Contracts | Liabilities under derivative contracts — foreign exchange contracts | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities under derivative contracts, fair value	(6.2)		(6.2)		(14.3)
Foreign Exchange Contracts | Liabilities under derivative contracts — foreign exchange contracts | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities under derivative contracts, fair value	0.0		0.0		0.0
Interest Rate Swaps | Derivatives at fair value, assets | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives at fair value	(1.0)		(1.0)		0.1
Interest Rate Swaps | Derivatives at fair value, assets | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives at fair value	0.0		0.0		0.0
Interest Rate Swaps | Derivatives at fair value, assets | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives at fair value	(1.0)		(1.0)		0.1
Interest Rate Swaps | Derivatives at fair value, assets | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives at fair value	0.0		0.0		$ 0.0
Silverton 2015 | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net change from current period hedged transaction	$ 77.8		$ 77.8

XML

Investments - Narrative (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) security	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) security	Oct. 02, 2012
Investment Securities [Line Items]
Other than Temporary Impairment Losses, Investments	$ 0	$ (700,000)	$ 0	$ (700,000)
Fair market value	777,700,000		777,700,000		$ 771,000,000
Catastrophe bonds	32,300,000		32,300,000		34,800,000
Investment funded	2,400,000		$ 2,400,000		$ 2,500,000
Number of municipal holdings | security			2		2
Bank loans
Investment Securities [Line Items]
Fair market value	$ 80,200,000		$ 80,200,000		$ 85,100,000
Chaspark
Investment Securities [Line Items]
Percentage of ownership acquired						58.50%

XML

Fair Value Measurements - Narrative (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($) quote / Investment	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) quote / Investment	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) quote / Investment	Dec. 31, 2013 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Quotes per fixed income investment | quote / Investment	2.0		2.0		2.0
Quotes per equity investment | quote / Investment	4.0		4.0		4.0
Gross written premiums	$ 722,800,000	$ 779,300,000	$ 1,642,000,000	$ 1,634,800,000
Silverton 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans issued						$ 65,000,000.0
Loan notes held by third parties						$ 50,000,000.0
Silverton 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans issued					$ 85,000,000
Loan notes held by third parties	76,200,000		76,200,000		70,000,000
Level 3 | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loan notes held by third parties	$ 120,000,000		120,000,000		120,000,000
Gross written premiums			37,700,000		0
Reserve for losses			$ 3,800,000		$ 0

XML

Investments - Aggregate Fair Value and Gross Unrealized Loss by Type of Security (Details) $ in Millions	Jun. 30, 2015 USD ($) Security	Dec. 31, 2014 USD ($) Security
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 1,441.2	$ 794.7
0-12 months, Gross Unrealized Loss	(16.3)	(3.0)
Over 12 months, Fair Market Value	204.3	423.2
Over 12 months, Gross Unrealized Loss	(3.7)	(6.2)
Total, Fair Market Value	1,645.5	1,217.9
Total, Gross Unrealized Loss	$ (20.0)	$ (9.2)
Number of Securities | Security	513	431
Fixed income securities — Available for sale
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 1,386.6	$ 790.1
0-12 months, Gross Unrealized Loss	(16.3)	(3.0)
Over 12 months, Fair Market Value	204.3	423.2
Over 12 months, Gross Unrealized Loss	(3.7)	(6.2)
Total, Fair Market Value	1,590.9	1,213.3
Total, Gross Unrealized Loss	$ (20.0)	$ (9.2)
Number of Securities | Security	503	428
Total short-term investments — Available for sale
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 54.6	$ 4.6
0-12 months, Gross Unrealized Loss	0.0	0.0
Over 12 months, Fair Market Value	0.0	0.0
Over 12 months, Gross Unrealized Loss	0.0	0.0
Total, Fair Market Value	54.6	4.6
Total, Gross Unrealized Loss	$ 0.0	$ 0.0
Number of Securities | Security	10	3
U.S. government
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 125.8	$ 166.1
0-12 months, Gross Unrealized Loss	(1.0)	(0.5)
Over 12 months, Fair Market Value	40.6	79.4
Over 12 months, Gross Unrealized Loss	(0.1)	(0.8)
Total, Fair Market Value	166.4	245.5
Total, Gross Unrealized Loss	$ (1.1)	$ (1.3)
Number of Securities | Security	28	39
U.S. agency
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 3.9	$ 25.1
0-12 months, Gross Unrealized Loss	(0.1)	0.0
Over 12 months, Fair Market Value	5.0	4.9
Over 12 months, Gross Unrealized Loss	0.0	(0.1)
Total, Fair Market Value	8.9	30.0
Total, Gross Unrealized Loss	$ (0.1)	$ (0.1)
Number of Securities | Security	4	7
Municipal
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 1.9	$ 0.0
0-12 months, Gross Unrealized Loss	0.0	0.0
Over 12 months, Fair Market Value	0.0	0.0
Over 12 months, Gross Unrealized Loss	0.0	0.0
Total, Fair Market Value	1.9	0.0
Total, Gross Unrealized Loss	$ 0.0	$ 0.0
Number of Securities | Security	3	0
Corporate
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 829.2	$ 459.4
0-12 months, Gross Unrealized Loss	(10.6)	(2.1)
Over 12 months, Fair Market Value	75.0	171.3
Over 12 months, Gross Unrealized Loss	(1.5)	(3.1)
Total, Fair Market Value	904.2	630.7
Total, Gross Unrealized Loss	$ (12.1)	$ (5.2)
Number of Securities | Security	332	274
Non-U.S. government-backed corporate
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 10.3	$ 0.7
0-12 months, Gross Unrealized Loss	(0.1)	0.0
Over 12 months, Fair Market Value	0.0	0.0
Over 12 months, Gross Unrealized Loss	0.0	0.0
Total, Fair Market Value	10.3	0.7
Total, Gross Unrealized Loss	$ (0.1)	$ 0.0
Number of Securities | Security	5	1
Foreign government
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 150.9	$ 30.4
0-12 months, Gross Unrealized Loss	(1.0)	0.0
Over 12 months, Fair Market Value	3.7	44.2
Over 12 months, Gross Unrealized Loss	(0.1)	(0.2)
Total, Fair Market Value	154.6	74.6
Total, Gross Unrealized Loss	$ (1.1)	$ (0.2)
Number of Securities | Security	23	16
Asset-backed
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 29.6	$ 43.7
0-12 months, Gross Unrealized Loss	0.0	(0.1)
Over 12 months, Fair Market Value	12.1	11.7
Over 12 months, Gross Unrealized Loss	0.0	(0.1)
Total, Fair Market Value	41.7	55.4
Total, Gross Unrealized Loss	$ 0.0	$ (0.2)
Number of Securities | Security	30	43
Agency mortgage-backed
Schedule of Available-for-sale Securities [Line Items]
0-12 months, Fair Market Value	$ 235.0	$ 64.7
0-12 months, Gross Unrealized Loss	(3.5)	(0.3)
Over 12 months, Fair Market Value	67.9	111.7
Over 12 months, Gross Unrealized Loss	(2.0)	(1.9)
Total, Fair Market Value	302.9	176.4
Total, Gross Unrealized Loss	$ (5.5)	$ (2.2)
Number of Securities | Security	78	48

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Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Changes in Intangible Assets

The following tables provide a summary of the Company’s intangible assets for the three and six months ended June 30, 2015 and 2014:

	Three Months Ended June 30, 2015								Three Months Ended June 30, 2014
	Trade Mark		Insurance Licenses		Other		Total		Trade Mark		Insurance Licenses		Other			Total
	($ in millions)								($ in millions)
Intangible Assets
Beginning of the period	$	1.6	$	16.6	$	—	$	18.2	$	1.6	$	16.6	$	0.1		$	18.3
Amortization	—		—		—		—		—		—		(0.1		)	(0.1		)
End of the period	$	1.6	$	16.6	$	—	$	18.2	$	1.6	$	16.6	$	—		$	18.2

	Six Months Ended June 30, 2015								Six Months Ended June 30, 2014
	Trade Mark		Insurance Licenses		Other		Total		Trade Mark		Insurance Licenses		Other			Total
	($ in millions)								($ in millions)
Intangible Assets
Beginning of the period	$	1.6	$	16.6	$	—	$	18.2	$	1.6	$	16.6	$	0.2		$	18.4
Amortization	—		—		—		—		—		—		(0.2		)	(0.2		)
End of the period	$	1.6	$	16.6	$	—	$	18.2	$	1.6	$	16.6	$	—		$	18.2

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Derivative Contracts - Fair Value of Derivative Instruments (Details) - USD ($)	3 Months Ended		6 Months Ended			12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Cash collateral provided	$ 15,900,000		$ 15,900,000			$ 22,300,000
Derivatives at fair value	4,100,000		4,100,000			8,000,000
Pledged assets	0		0			0
Foreign Exchange Contracts
Derivatives, Fair Value [Line Items]
Foreign exchange contract settlement	100,000	$ 0
Foreign Exchange Contracts | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Cash collateral provided	3,200,000.0		3,200,000.0			0
Foreign exchange contract settlement	100,000	0	(2,700,000)		$ 0
Derivative notional amount	0		0			135,800,000
Foreign Exchange Contracts | Designated as Hedging Instrument | Liabilities under Derivative Contracts
Derivatives, Fair Value [Line Items]
Fair Value			0			(3,800,000)	[1]
Foreign Exchange Contracts | Designated as Hedging Instrument | Derivatives At Fair Value [Member]
Derivatives, Fair Value [Line Items]
Derivative notional amount	56,400,000		56,400,000			0
Fair Value			2.1	[1]		0
Foreign Exchange Contracts | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Derivative notional amount	428,500,000		428,500,000			403,400,000
Foreign Exchange Contracts | Derivatives Not Designated as Hedging Instruments | Liabilities under Derivative Contracts
Derivatives, Fair Value [Line Items]
Liability notional amount	283,500,000		283,500,000			237,600,000
Foreign Exchange Contracts | Derivatives Not Designated as Hedging Instruments | Derivatives At Fair Value [Member]
Derivatives, Fair Value [Line Items]
Derivative notional amount	145,000,000		145,000,000			165,800,000
Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Other assets pledged	0		0
Interest Rate Swaps | Derivatives Not Designated as Hedging Instruments | Derivatives At Fair Value [Member]
Derivatives, Fair Value [Line Items]
Derivative notional amount	951,300,000		951,300,000			951,300,000
Derivatives at fair value, assets | Fair Value, Measurements, Recurring | Foreign Exchange Contracts
Derivatives, Fair Value [Line Items]
Derivatives at fair value	4,100,000		4,100,000			7,900,000
Derivatives at fair value, assets | Fair Value, Measurements, Recurring | Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Derivatives at fair value	(1,000,000)		(1,000,000)			100,000
Derivatives at fair value, assets | Level 2 | Fair Value, Measurements, Recurring | Foreign Exchange Contracts
Derivatives, Fair Value [Line Items]
Derivatives at fair value	4,100,000		4,100,000			7,900,000
Derivatives at fair value, assets | Level 2 | Fair Value, Measurements, Recurring | Foreign Exchange Contracts | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Derivatives at fair value	2,000,000		2,000,000			7,900,000
Derivatives at fair value, assets | Level 2 | Fair Value, Measurements, Recurring | Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Derivatives at fair value	(1,000,000)		(1,000,000)			100,000
Derivatives at fair value, assets | Level 2 | Fair Value, Measurements, Recurring | Interest Rate Swaps | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Derivatives at fair value	(1,000,000)		(1,000,000)			100,000	[2]
Liabilities under derivative contracts | Fair Value, Measurements, Recurring | Foreign Exchange Contracts
Derivatives, Fair Value [Line Items]
Liabilities at fair value	(6,200,000)		(6,200,000)			(14,300,000)
Liabilities under derivative contracts | Level 2 | Fair Value, Measurements, Recurring | Foreign Exchange Contracts
Derivatives, Fair Value [Line Items]
Liabilities at fair value	(6,200,000)		(6,200,000)			(14,300,000)
Liabilities under derivative contracts | Level 2 | Fair Value, Measurements, Recurring | Foreign Exchange Contracts | Derivatives Not Designated as Hedging Instruments | Liabilities under Derivative Contracts
Derivatives, Fair Value [Line Items]
Liabilities at fair value	(6,200,000)		(6,200,000)			$ (10,500,000)
Change in Fair Value of Derivatives | Foreign Exchange Contracts | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Fair Value	5,100,000	0	2,700,000		0
Change in Fair Value of Derivatives | Foreign Exchange Contracts | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	2,200,000	(1,100,000)	(2,400,000)		1,900,000
Change in Fair Value of Derivatives | Interest Rate Swaps | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	$ (200,000)	$ (3,500,000)	$ (3,400,000)		$ (5,400,000)

[1] Net of $3.2 million cash collateral (December 31, 2014 — $Nil).

[2] Net of $15.9 million of cash collateral provided to counterparties, Goldman Sachs International ($451.3 million notional) and Crédit Agricole CIB ($500.0 million notional) under respective International Swap Dealers Association agreements, as security for the Company’s net liability position (December 31, 2014 — $22.3 million).

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Commitments and Contingent Liabilities - Amounts Outstanding under Operating Leases (Details) $ in Millions	Jun. 30, 2015 USD ($)
Leases [Abstract]
2015	$ 6.8
2016	9.8
2017	8.5
2018	7.0
2019	6.1
Later Years	12.9
Total	$ 51.1

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Earnings per Ordinary Share (Tables)

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings per Share

The following table sets forth the computation of basic and diluted earnings per share for the three and six months ended June 30, 2015 and 2014, respectively:

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
	($ in millions, except share and per share amounts)
Net income	$	49.0		$	130.8		$	177.0		$	251.2
Preference share dividends	(9.4		)	(9.4		)	(18.9		)	(18.9		)
Net profit attributable to non-controlling interest	(0.5		)	—			(0.5		)	(0.1		)
Basic and diluted net income available to ordinary shareholders	39.1			121.4			157.6			232.2
Ordinary shares:
Basic weighted average ordinary shares	61,408,633			65,447,128			61,775,646			65,368,675
Weighted average effect of dilutive securities(1)	1,488,274			1,253,240			1,389,217			1,277,644
Total diluted weighted average ordinary shares	62,896,907			66,700,368			63,164,863			66,646,319
Earnings per ordinary share:
Basic	$	0.64		$	1.85		$	2.55		$	3.55
Diluted	$	0.62		$	1.82		$	2.50		$	3.48

⁽¹⁾  Dilutive securities comprise: employee options, restricted share units and performance shares associated with the Company’s long term incentive plan, employee share purchase plans and director restricted stock units and options as described in Note 14.

Summary of Declared Dividends

Dividends. On July 22, 2015, the Company’s Board of Directors (“Board of Directors”) declared the following quarterly dividends:

	Dividend		Payable on:	Record Date:
Ordinary shares	$	0.21	August 25, 2015	August 7, 2015
7.401% preference shares	$	0.462563	October 1, 2015	September 15, 2015
7.250% preference shares	$	0.4531	October 1, 2015	September 15, 2015
5.95% preference shares	$	0.3719	October 1, 2015	September 15, 2015

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Fair Value Measurements - Financial Assets Measured on Recurring Basis (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Catastrophe bonds trading, at fair value	$ 32.6		$ 32.6		$ 34.4
Derivatives at fair value	4.1		4.1		8.0
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Catastrophe bonds trading, at fair value	32.3		32.3
Loan notes issued by variable interest entities, at fair value	(76.2)		(76.2)		(70.7)
Loan notes issued by variable interest entities, at fair value (classified as a current liability)	(1.6)		(1.6)		(67.9)
Total	7,273.3		7,273.3		7,275.3
Recurring | Short-term investments trading, at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	1.1		1.1		0.2
Recurring | Equity investments trading, at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	729.3		729.3		616.0
Recurring | Derivatives at fair value, assets | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives at fair value	4.1		4.1		7.9
Recurring | Derivatives at fair value, assets | Interest Rate Swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives at fair value	(1.0)		(1.0)		0.1
Recurring | Liabilities under derivative contracts — foreign exchange contracts | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities under derivative contracts, fair value	(6.2)		(6.2)		(14.3)
Available for sale financial assets, at fair value | Recurring | U.S. government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	1,074.6		1,074.6		1,094.4
Available for sale financial assets, at fair value | Recurring | U.S. agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	182.0		182.0		197.4
Available for sale financial assets, at fair value | Recurring | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	29.5		29.5		31.5
Available for sale financial assets, at fair value | Recurring | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	2,420.8		2,420.8		2,319.4
Available for sale financial assets, at fair value | Recurring | Non-U.S. government-backed corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	78.3		78.3		78.0
Available for sale financial assets, at fair value | Recurring | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	661.7		661.7		665.7
Available for sale financial assets, at fair value | Recurring | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	138.7		138.7		143.5
Available for sale financial assets, at fair value | Recurring | Non-agency commercial mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	35.6		35.6		44.8
Available for sale financial assets, at fair value | Recurring | Agency mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	1,008.5		1,008.5		1,055.3
Fixed income securities — Available for sale | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	5,629.7		5,629.7		5,630.0
Short-term investments — Available for sale | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	184.1		184.1		258.3
Equity investments available for sale, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure					109.9
Held for trading financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	777.7		777.7		805.8
Catastrophe bonds trading, at fair value					34.8
Held for trading financial assets, at fair value | Recurring | U.S. government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	3.4		3.4		0.0
Held for trading financial assets, at fair value | Recurring | U.S. agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure					0.2
Held for trading financial assets, at fair value | Recurring | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.5		0.5		1.1
Held for trading financial assets, at fair value | Recurring | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	540.1		540.1		529.8
Held for trading financial assets, at fair value | Recurring | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	133.8		133.8		140.1
Held for trading financial assets, at fair value | Recurring | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	19.7		19.7		14.7
Held for trading financial assets, at fair value | Recurring | Bank loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	80.2		80.2		85.1
Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Catastrophe bonds trading, at fair value	0.0		0.0
Loan notes issued by variable interest entities, at fair value	0.0		0.0		0.0
Loan notes issued by variable interest entities, at fair value (classified as a current liability)	0.0		0.0		0.0
Total	2,328.2		2,328.2		2,542.3
Level 1 | Recurring | Short-term investments trading, at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.1
Level 1 | Recurring | Equity investments trading, at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	729.3		729.3		616.0
Level 1 | Recurring | Derivatives at fair value, assets | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives at fair value	0.0		0.0		0.0
Level 1 | Recurring | Derivatives at fair value, assets | Interest Rate Swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives at fair value	0.0		0.0		0.0
Level 1 | Recurring | Liabilities under derivative contracts — foreign exchange contracts | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities under derivative contracts, fair value	0.0		0.0		0.0
Level 1 | Available for sale financial assets, at fair value | Recurring | U.S. government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	1,074.6		1,074.6		1,094.4
Level 1 | Available for sale financial assets, at fair value | Recurring | U.S. agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 1 | Available for sale financial assets, at fair value | Recurring | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 1 | Available for sale financial assets, at fair value | Recurring | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 1 | Available for sale financial assets, at fair value | Recurring | Non-U.S. government-backed corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 1 | Available for sale financial assets, at fair value | Recurring | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	479.6		479.6		456.5
Level 1 | Available for sale financial assets, at fair value | Recurring | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 1 | Available for sale financial assets, at fair value | Recurring | Non-agency commercial mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 1 | Available for sale financial assets, at fair value | Recurring | Agency mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 1 | Fixed income securities — Available for sale | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	1,554.2		1,554.2		1,550.9
Level 1 | Short-term investments — Available for sale | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		229.3
Level 1 | Equity investments available for sale, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure					109.9
Level 1 | Held for trading financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	44.7		44.7		36.1
Catastrophe bonds trading, at fair value					0.0
Level 1 | Held for trading financial assets, at fair value | Recurring | U.S. government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	3.4		3.4		0.0
Level 1 | Held for trading financial assets, at fair value | Recurring | U.S. agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure					0.0
Level 1 | Held for trading financial assets, at fair value | Recurring | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 1 | Held for trading financial assets, at fair value | Recurring | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 1 | Held for trading financial assets, at fair value | Recurring | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	41.3		41.3		36.1
Level 1 | Held for trading financial assets, at fair value | Recurring | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 1 | Held for trading financial assets, at fair value | Recurring | Bank loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Catastrophe bonds trading, at fair value	32.3		32.3
Loan notes issued by variable interest entities, at fair value	0.0		0.0		0.0
Loan notes issued by variable interest entities, at fair value (classified as a current liability)	0.0		0.0		0.0
Total	5,022.9		5,022.9		4,871.6
Level 2 | Recurring | Short-term investments trading, at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	1.1		1.1		0.1
Level 2 | Recurring | Equity investments trading, at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 2 | Recurring | Derivatives at fair value, assets | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives at fair value	4.1		4.1		7.9
Level 2 | Recurring | Derivatives at fair value, assets | Interest Rate Swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives at fair value	(1.0)		(1.0)		0.1
Level 2 | Recurring | Liabilities under derivative contracts — foreign exchange contracts | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities under derivative contracts, fair value	(6.2)		(6.2)		(14.3)
Level 2 | Available for sale financial assets, at fair value | Recurring | U.S. government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 2 | Available for sale financial assets, at fair value | Recurring | U.S. agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	182.0		182.0		197.4
Level 2 | Available for sale financial assets, at fair value | Recurring | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	29.5		29.5		31.5
Level 2 | Available for sale financial assets, at fair value | Recurring | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	2,420.8		2,420.8		2,319.4
Level 2 | Available for sale financial assets, at fair value | Recurring | Non-U.S. government-backed corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	78.3		78.3		78.0
Level 2 | Available for sale financial assets, at fair value | Recurring | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	182.1		182.1		209.2
Level 2 | Available for sale financial assets, at fair value | Recurring | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	138.7		138.7		143.5
Level 2 | Available for sale financial assets, at fair value | Recurring | Non-agency commercial mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	35.6		35.6		44.8
Level 2 | Available for sale financial assets, at fair value | Recurring | Agency mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	1,008.5		1,008.5		1,055.3
Level 2 | Fixed income securities — Available for sale | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	4,075.5		4,075.5		4,079.1
Level 2 | Short-term investments — Available for sale | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	184.1		184.1		29.0
Level 2 | Equity investments available for sale, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure					0.0
Level 2 | Held for trading financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	733.0		733.0		769.7
Catastrophe bonds trading, at fair value					34.8
Level 2 | Held for trading financial assets, at fair value | Recurring | U.S. government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 2 | Held for trading financial assets, at fair value | Recurring | U.S. agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure					0.2
Level 2 | Held for trading financial assets, at fair value | Recurring | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.5		0.5		1.1
Level 2 | Held for trading financial assets, at fair value | Recurring | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	540.1		540.1		529.8
Level 2 | Held for trading financial assets, at fair value | Recurring | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	92.5		92.5		104.0
Level 2 | Held for trading financial assets, at fair value | Recurring | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	19.7		19.7		14.7
Level 2 | Held for trading financial assets, at fair value | Recurring | Bank loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	80.2		80.2		85.1
Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Catastrophe bonds trading, at fair value	0.0		0.0
Loan notes issued by variable interest entities, at fair value	(76.2)		(76.2)		(70.7)
Loan notes issued by variable interest entities, at fair value (classified as a current liability)	(1.6)		(1.6)		(67.9)
Total	(77.8)		(77.8)		(138.6)
Level 3 | Recurring | Short-term investments trading, at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 3 | Recurring | Equity investments trading, at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 3 | Recurring | Derivatives at fair value, assets | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives at fair value	0.0		0.0		0.0
Level 3 | Recurring | Derivatives at fair value, assets | Interest Rate Swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives at fair value	0.0		0.0		0.0
Level 3 | Recurring | Liabilities under derivative contracts — foreign exchange contracts | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities under derivative contracts, fair value	0.0		0.0		0.0
Level 3 | Available for sale financial assets, at fair value | Recurring | U.S. government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 3 | Available for sale financial assets, at fair value | Recurring | U.S. agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 3 | Available for sale financial assets, at fair value | Recurring | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 3 | Available for sale financial assets, at fair value | Recurring | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 3 | Available for sale financial assets, at fair value | Recurring | Non-U.S. government-backed corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 3 | Available for sale financial assets, at fair value | Recurring | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 3 | Available for sale financial assets, at fair value | Recurring | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 3 | Available for sale financial assets, at fair value | Recurring | Non-agency commercial mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 3 | Available for sale financial assets, at fair value | Recurring | Agency mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 3 | Fixed income securities — Available for sale | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 3 | Short-term investments — Available for sale | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 3 | Equity investments available for sale, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure					0.0
Level 3 | Held for trading financial assets, at fair value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Catastrophe bonds trading, at fair value					0.0
Level 3 | Held for trading financial assets, at fair value | Recurring | U.S. government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 3 | Held for trading financial assets, at fair value | Recurring | U.S. agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure					0.0
Level 3 | Held for trading financial assets, at fair value | Recurring | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 3 | Held for trading financial assets, at fair value | Recurring | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 3 | Held for trading financial assets, at fair value | Recurring | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 3 | Held for trading financial assets, at fair value | Recurring | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Level 3 | Held for trading financial assets, at fair value | Recurring | Bank loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0		0.0		0.0
Silverton 2014 | Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds from Equity Method Investment, Dividends or Distributions	$ 2.2	$ 0.0	$ 67.0	$ 0.0
Total					$ 138.6

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Investments - Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Available for Sale Investments in Fixed Income Maturities, Short-Term Investments and Equities (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	$ 5,696.8	$ 5,803.7
Gross Unrealized Gains	137.0	203.7
Gross Unrealized Losses	(20.0)	(9.2)
Fair Market Value	5,813.8	5,998.2
Total fixed income securities — Available for sale
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	5,512.8	5,462.9
Gross Unrealized Gains	136.9	176.3
Gross Unrealized Losses	(20.0)	(9.2)
Fair Market Value	5,629.7	5,630.0
Total short-term investments — Available for sale
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	184.0	258.2
Gross Unrealized Gains	0.1	0.1
Gross Unrealized Losses	0.0	0.0
Fair Market Value	184.1	258.3
Total equity securities — Available for sale
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost		82.6
Gross Unrealized Gains		27.3
Gross Unrealized Losses		0.0
Fair Market Value		109.9
U.S. government
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	1,056.2	1,074.2
Gross Unrealized Gains	19.5	21.5
Gross Unrealized Losses	(1.1)	(1.3)
Fair Market Value	1,074.6	1,094.4
U.S. agency
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	175.8	190.0
Gross Unrealized Gains	6.3	7.5
Gross Unrealized Losses	(0.1)	(0.1)
Fair Market Value	182.0	197.4
Municipal
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	27.8	29.1
Gross Unrealized Gains	1.7	2.4
Gross Unrealized Losses	0.0	0.0
Fair Market Value	29.5	31.5
Corporate
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	2,373.3	2,244.7
Gross Unrealized Gains	59.6	79.9
Gross Unrealized Losses	(12.1)	(5.2)
Fair Market Value	2,420.8	2,319.4
Non-U.S. government-backed corporate
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	77.5	76.8
Gross Unrealized Gains	0.9	1.2
Gross Unrealized Losses	(0.1)	0.0
Fair Market Value	78.3	78.0
Foreign government
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	650.3	648.6
Gross Unrealized Gains	12.5	17.3
Gross Unrealized Losses	(1.1)	(0.2)
Fair Market Value	661.7	665.7
Asset-backed
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	136.6	141.3
Gross Unrealized Gains	2.1	2.4
Gross Unrealized Losses	0.0	(0.2)
Fair Market Value	138.7	143.5
Non-agency commercial mortgage-backed
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	33.4	41.5
Gross Unrealized Gains	2.2	3.3
Gross Unrealized Losses	0.0	0.0
Fair Market Value	35.6	44.8
Agency mortgage-backed
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	981.9	1,016.7
Gross Unrealized Gains	32.1	40.8
Gross Unrealized Losses	(5.5)	(2.2)
Fair Market Value	$ 1,008.5	$ 1,055.3

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Earnings per Ordinary Share - Summary of Declared Dividends (Details) - $ / shares		6 Months Ended
	Jul. 22, 2015	Jun. 30, 2015
7.401% preference shares
Dividends Payable [Line Items]
Preference shares, rate		7.401%
7.250% preference shares
Dividends Payable [Line Items]
Preference shares, rate		7.25%
5.95% preference shares
Dividends Payable [Line Items]
Preference shares, rate		5.95%
Subsequent Event [Member] | Ordinary shares
Dividends Payable [Line Items]
Dividend (in usd per share)	$ 0.21
Payable on:	Aug. 25, 2015
Record Date:	Aug. 07, 2015
Subsequent Event [Member] | 7.401% preference shares
Dividends Payable [Line Items]
Dividend (in usd per share)	$ 0.462563
Payable on:	Oct. 01, 2015
Record Date:	Sep. 15, 2015
Subsequent Event [Member] | 7.250% preference shares
Dividends Payable [Line Items]
Dividend (in usd per share)	$ 0.4531
Payable on:	Oct. 01, 2015
Record Date:	Sep. 15, 2015
Subsequent Event [Member] | 5.95% preference shares
Dividends Payable [Line Items]
Dividend (in usd per share)	$ 0.3719
Payable on:	Oct. 01, 2015
Record Date:	Sep. 15, 2015

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Fair Value Measurements - Pricing Sources Used in Pricing Fixed Income Investments (Details)	Jun. 30, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Index providers	83.00%	84.00%
Pricing services	12.00%	11.00%
Broker-dealers	5.00%	5.00%
Total	100.00%	100.00%

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Intangible Assets - Summary of Changes in Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Finite and Indefinite Lived Intangible Assets [Roll Forward]
Beginning of the period	$ 18.2	$ 18.3	$ 18.2	$ 18.4
Amortization	0.0	(0.1)	0.0	(0.2)
End of the period	18.2	18.2	18.2	18.2
Trade Mark
Finite and Indefinite Lived Intangible Assets [Roll Forward]
Beginning of the period	1.6	1.6	1.6	1.6
Amortization	0.0	0.0	0.0	0.0
End of the period	1.6	1.6	1.6	1.6
Insurance Licenses
Finite and Indefinite Lived Intangible Assets [Roll Forward]
Beginning of the period	16.6	16.6	16.6	16.6
Amortization	0.0	0.0	0.0	0.0
End of the period	16.6	16.6	16.6	16.6
Other
Finite and Indefinite Lived Intangible Assets [Roll Forward]
Beginning of the period	0.0	0.1	0.0	0.2
Amortization	0.0	(0.1)	0.0	(0.2)
End of the period	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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Reserves for Losses and Loss Adjustment Expenses - Reconciliation of Beginning and Ending Consolidated Loss and Loss Adjustment Expenses ("LAE") Reserves (Details) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Insurance [Abstract]
Provision for losses and LAE at the start of the year	$ 4,750,800,000	$ 4,678,900,000	$ 4,678,900,000
Less reinsurance recoverable			(350,000,000)	$ (332,700,000)
Net loss and LAE at the start of the year	4,400,800,000	4,346,200,000	4,346,200,000
Net loss and LAE expenses (disposed)	0	(24,200,000)	(24,200,000)
Provision for losses and LAE for claims incurred:
Current year	725,200,000		1,411,600,000
Prior years	(58,600,000)	(60,000,000)	(104,100,000)
Total incurred	666,600,000		1,307,500,000
Losses and LAE payments for claims incurred:
Current year	(33,100,000)		(112,100,000)
Prior years	(520,600,000)		(995,600,000)
Total paid	(553,700,000)		(1,107,700,000)
Foreign exchange (gains)	(35,100,000)		(121,000,000)
Net losses and LAE reserves at period end	4,478,600,000	$ 4,435,800,000	4,400,800,000
Plus reinsurance recoverable on unpaid losses at period end	337,300,000		350,000,000
Provision for losses and LAE at the end of the relevant period	$ 4,815,900,000		$ 4,750,800,000

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Investments - Analysis of Investment Purchases/Sales and Maturities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Gain (Loss) on Investments [Line Items]
(Purchases) of equity securities — Trading			$ (268.9)	$ (118.9)
Proceeds from sales and maturities of fixed income securities — Available for sale	$ 320.8	$ 417.1	861.5	1,015.9
Proceeds from sales and maturities of fixed income securities — Trading	130.7	190.9	264.5	372.2
Proceeds from sales of equity securities — Available for sale			108.6	15.6
Proceeds from sales of equity securities — Trading			151.1	18.2
Net change in (payable)/receivable for securities (purchased)/sold	(10.1)	6.2	5.8	19.8
(Purchases) of short-term investments — Available for sale			(109.3)	(268.9)
Proceeds from Available-for-sale Securities, Short-term			172.4	92.9
(Purchases) of short-term investments — Trading			(15.7)	(80.2)
Proceeds from Sale of Short-term Investments			14.8	66.2
Net proceeds/(purchases) of catastrophe bonds — Trading			1.8	(24.3)
Proceeds from other investments	0.0	0.0	0.0	37.3
Net (purchases) for the period	(149.7)	(156.4)	(28.2)	(171.2)
Available for sale
Gain (Loss) on Investments [Line Items]
(Purchases) of fixed income securities — Available for sale	(455.6)	(380.9)	(939.3)	(918.1)
Proceeds from sales of equity securities — Available for sale	0.0	11.6	108.6	15.6
(Purchases) of short-term investments — Available for sale	(47.2)	(137.6)	(109.3)	(268.9)
Proceeds from Available-for-sale Securities, Short-term	49.0	23.5	172.4	92.9
Trading
Gain (Loss) on Investments [Line Items]
(Purchases) of fixed income securities — Trading	(122.1)	(206.8)	(275.5)	(398.9)
(Purchases) of equity securities — Trading	(82.2)	(67.1)	(268.9)	(118.9)
Proceeds from sales of equity securities — Trading	67.4	12.9	151.1	18.2
(Purchases) of short-term investments — Trading	(2.9)	(70.2)	(15.7)	(80.2)
Proceeds from Sale of Short-term Investments	2.5	56.2	14.8	66.2
Net proceeds/(purchases) of catastrophe bonds — Trading	$ 0.0	$ (12.2)	$ 1.8	$ (24.3)

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Reclassifications from Accumulated Other Comprehensive Income

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Reclassifications from Accumulated Other Comprehensive Income

Reclassifications from Accumulated Other Comprehensive Income

The following table sets out the components of the Company’s accumulated other comprehensive income (“AOCI”) that are reclassified into the unaudited condensed consolidated statement of operations for the three and six months ended June 30, 2015 and 2014:

	Amount Reclassified from AOCI
Details about the AOCI Components	Three Months Ended June 30, 2015			Three Months Ended June 30, 2014			Affected Line Item in the Unaudited Condensed Consolidated Statement of Operations
	($ in millions)
Available for sale securities:
Realized gains on sale of securities	$	2.1		$	3.7		Realized and unrealized investment gains
Realized (losses) on sale of securities	(2.7		)	(1.8		)	Realized and unrealized investment losses
	(0.6		)	1.9			Income from operations before income tax
Tax on net realized gains of securities	—			0.1			Income tax expense
	$	(0.6	)	$	2.0		Net income
Foreign currency translation adjustments:
Foreign currency translation adjustments, before tax	(0.5		)	$	—		Net realized and unrealized foreign exchange gains/(losses)
	$	(0.5	)	$	—		Net income
Realized derivatives:
Net realized gains on settled derivatives	0.1			$	—		General, administrative and corporate expenses
	$	0.1		$	—		Net income
Total reclassifications from AOCI to the statement of operations, net of tax	$	(1.0	)	$	2.0		Net income

	Amount Reclassified from AOCI
Details about the AOCI Components	Six Months Ended June 30, 2015			Six Months Ended June 30, 2014			Affected Line Item in the Unaudited Condensed Consolidated Statement of Operations
	($ in millions)
Available for sale securities:
Realized gains on sale of securities	$	35.6		$	6.7		Realized and unrealized investment gains
Realized (losses) on sale of securities	(3.9		)	(4.4		)	Realized and unrealized investment losses
	31.7			2.3			Income from operations before income tax
Tax on net realized gains of securities	(0.4		)	(0.1		)	Income tax expense
Total reclassifications from AOCI to the statement of operations, net of tax	$	31.3		$	2.2		Net income
Foreign currency translation adjustments:
Foreign currency translation adjustments, before tax	1.1			$	—		Net realized and unrealized foreign exchange gains/(losses)
	$	1.1		$	—		Net income
Realized derivatives:
Net realized (losses) on settled derivatives	(2.7		)	$	—		General, administrative and corporate expenses
	$	(2.7	)	$	—		Net income
Total reclassifications from AOCI to the statement of operations, net of tax	$	29.7		$	2.2		Net income

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Reserves for Losses and Loss Adjustment Expenses - Narrative (Details) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Insurance [Abstract]
Reserve releases	$ 58,600,000	$ 60,000,000	$ 104,100,000
Loss portfolio transfers (disposed)	$ 0	$ 24,200,000	$ 24,200,000

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Investments - Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Trading Investments in Fixed Income Maturities (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	$ 771.4	$ 760.9
Fair Market Value	777.7	771.0
Short-term investments, trading at fair value, amortized cost	1.1	0.2
U.S. government
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	3.4
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Fair Market Value	3.4
U.S. agency
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost		0.2
Gross Unrealized Gains		0.0
Gross Unrealized Losses		0.0
Fair Market Value		0.2
Municipal
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	0.5	1.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Market Value	0.5	1.1
Corporate
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	535.9	520.9
Gross Unrealized Gains	8.7	11.7
Gross Unrealized Losses	(4.5)	(2.8)
Fair Market Value	540.1	529.8
Foreign government
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	131.4	137.3
Gross Unrealized Gains	3.3	4.3
Gross Unrealized Losses	(0.9)	(1.5)
Fair Market Value	133.8	140.1
Asset-backed
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	19.6	14.6
Gross Unrealized Gains	0.1	0.1
Gross Unrealized Losses	0.0	0.0
Fair Market Value	19.7	14.7
Bank loans
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	80.6	86.8
Gross Unrealized Gains	0.2	0.0
Gross Unrealized Losses	(0.6)	(1.7)
Fair Market Value	80.2	85.1
Total fixed income securities — Trading
Schedule of Trading Securities and Other Trading Items [Line Items]
Gross Unrealized Gains	12.3	16.1
Gross Unrealized Losses	(6.0)	(6.0)
Fair Market Value	777.7	771.0
Cost or Amortized Cost, Total fixed income securities, Trading	771.4	760.9
Total short-term investments — Trading
Schedule of Trading Securities and Other Trading Items [Line Items]
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Market Value	1.1	0.2
Short-term investments, trading at fair value, amortized cost	1.1	0.2
Total equity securities — Trading
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	717.5	585.2
Gross Unrealized Gains	48.6	55.5
Gross Unrealized Losses	(36.8)	(24.7)
Fair Market Value	729.3	616.0
Total catastrophe bonds — Trading
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	32.6	34.4
Gross Unrealized Gains	0.0	0.4
Gross Unrealized Losses	(0.3)	0.0
Fair Market Value	32.3	34.8
Total
Schedule of Trading Securities and Other Trading Items [Line Items]
Cost or Amortized Cost	1,522.6	1,380.7
Gross Unrealized Gains	60.9	72.0
Gross Unrealized Losses	(43.1)	(30.7)
Fair Market Value	$ 1,540.4	$ 1,422.0

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Derivative Contracts (Tables)

6 Months Ended

Jun. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Value of Derivative Instruments

The following tables summarize information on the location and amounts of derivative fair values on the consolidated balance sheet as at June 30, 2015 and December 31, 2014:

		As at June 30, 2015						As at December 31, 2014
Derivatives Not Designated as Hedging Instruments Under ASC 815	Balance Sheet Location	Notional Amount		Fair Value				Notional Amount		Fair Value
		($ in millions)						($ in millions)
Interest Rate Swaps	Liabilities under Derivative Contracts	$	951.3	$	(1.0	)	(1)	$	951.3	$	0.1		(1)
Foreign Exchange Contracts	Derivatives at Fair Value	$	145.0	$	2.0			$	165.8	$	7.9
Foreign Exchange Contracts	Liabilities under Derivative Contracts	$	283.5	$	(6.2	)		$	237.6	$	(10.5	)

⁽¹⁾  Net of $15.9 million of cash collateral provided to counterparties, Goldman Sachs International ($451.3 million notional) and Crédit Agricole CIB ($500.0 million notional) under respective International Swap Dealers Association agreements, as security for the Company’s net liability position (December 31, 2014 — $22.3 million).

		As at June 30, 2015					As at December 31, 2014
Derivatives Designated as Hedging Instruments Under ASC 815	Balance Sheet Location	Notional Amount		Fair Value			Notional Amount		Fair Value
		($ in millions)					($ in millions)
Foreign Exchange Contracts	Liabilities under Derivative Contracts	$	—	$	—		$	135.8	$	(3.8	)	(1)
Foreign Exchange Contracts	Derivatives at Fair Value	$	56.4	$	2.1	(1)	$	—	$	—

⁽¹⁾  Net of $3.2 million cash collateral (December 31, 2014 — $Nil).

Gain/(Loss) Recognized in Income on Derivative

The following tables provide the unrealized and realized gains/(losses) recorded in the statement of operations for the three and six months ended June 30, 2015 and 2014, respectively:

		Amount of Income/(Loss) Recognized in the Statement of Operations and Other Comprehensive Income for the
		Three Months Ended
Derivatives Not Designated as Hedging Instruments Under ASC 815	Location of Income/(Loss) Recognized in the Statement of Operations and Other Comprehensive Income	June 30, 2015			June 30, 2014
		($ in millions)
Foreign Exchange Contracts	Change in Fair Value of Derivatives	$	2.2		$	(1.1	)
Interest Rate Swaps	Change in Fair Value of Derivatives	$	(0.2	)	$	(3.5	)

		Amount of Income/(Loss) Recognized in the Statement of Operations and Other Comprehensive Income for the
		Six Months Ended
Derivatives Not Designated as Hedging Instruments Under ASC 815	Location of Income/(Loss) Recognized in the Statement of Operations and Other Comprehensive Income	June 30, 2015			June 30, 2014
		($ in millions)
Foreign Exchange Contracts	Change in Fair Value of Derivatives	$	(2.4	)	$	1.9
Interest Rate Swaps	Change in Fair Value of Derivatives	$	(3.4	)	$	(5.4	)

		Amount of Income Recognized in the Statement of Operations and Other Comprehensive Income for the
		Three Months Ended
Derivatives Designated as Hedging Instruments Under ASC 815	Location of Income Recognized in the Statement of Operations and Other Comprehensive Income	June 30, 2015		June 30, 2014
		($ in millions)
Foreign Exchange Contracts	General, administrative and corporate expenses	$	0.1	$	—
Foreign Exchange Contracts	Net change from current period hedged transactions	$	5.1	$	—

		Amount of Income/(Loss) Recognized in the Statement of Operations and Other Comprehensive Income for the
		Six Months Ended
Derivatives Designated as Hedging Instruments Under ASC 815	Location of Income/(Loss) Recognized in the Statement of Operations and Other Comprehensive Income	June 30, 2015			June 30, 2014
		($ in millions)
Foreign Exchange Contracts	General, administrative and corporate expenses	$	(2.7	)	$	—
Foreign Exchange Contracts	Net change from current period hedged transactions	$	2.7		$	—

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Financial Assets Measured on Recurring Basis

The following tables present the level within the fair value hierarchy at which the Company’s financial assets and liabilities are measured on a recurring basis as at June 30, 2015 and December 31, 2014, respectively:

	As at June 30, 2015
	Level 1		Level 2			Level 3			Total
	($ in millions)
Available for sale financial assets, at fair value
U.S. government	$	1,074.6	$	—		$	—		$	1,074.6
U.S. agency	—		182.0			—			182.0
Municipal	—		29.5			—			29.5
Corporate	—		2,420.8			—			2,420.8
Non-U.S. government-backed corporate	—		78.3			—			78.3
Foreign government	479.6		182.1			—			661.7
Asset-backed	—		138.7			—			138.7
Non-agency commercial mortgage-backed	—		35.6			—			35.6
Agency mortgage-backed	—		1,008.5			—			1,008.5
Total fixed income securities available for sale, at fair value	1,554.2		4,075.5			—			5,629.7
Short-term investments available for sale, at fair value	—		184.1			—			184.1
Held for trading financial assets, at fair value
U.S. government	3.4		—			—			3.4
Municipal	—		0.5			—			0.5
Corporate	—		540.1			—			540.1
Foreign government	41.3		92.5			—			133.8
Asset-backed	—		19.7			—			19.7
Bank loans	—		80.2			—			80.2
Total fixed income securities trading, at fair value	44.7		733.0			—			777.7
Short-term investments trading, at fair value	—		1.1			—			1.1
Equity investments trading, at fair value	729.3		—			—			729.3
Catastrophe bonds trading, at fair value	—		32.3			—			32.3
Other financial assets and liabilities, at fair value
Derivatives at fair value — foreign exchange contracts	—		4.1			—			4.1
Liabilities under derivative contracts — interest rate swaps	—		(1.0		)	—			(1.0		)
Liabilities under derivative contracts — foreign exchange contracts	—		(6.2		)	—			(6.2		)
Loan notes issued by variable interest entities, at fair value	—		—			(76.2		)	(76.2		)
Loan notes issued by variable interest entities, at fair value (classified as a current liability)	—		—			(1.6		)	(1.6		)
Total	$	2,328.2	$	5,022.9		$	(77.8	)	$	7,273.3

There were no maturities or transfers between Level 1, Level 2 and Level 3 during the three and six months ended June 30, 2015. The Company settled $2.2 million and $67.0 million Level 3 liabilities in respect to the loan notes issued by the VIEs for the three and six months ended June 30, 2015. As at at June 30, 2015, there were no assets classified as Level 3 and the Company's Level 3 liabilities consisted of the loan notes issued by the VIEs.

	As at December 31, 2014
	Level 1		Level 2			Level 3			Total
	($ in millions)
Available for sale financial assets, at fair value
U.S. government	$	1,094.4	$	—		$	—		$	1,094.4
U.S. agency	—		197.4			—			197.4
Municipal	—		31.5			—			31.5
Corporate	—		2,319.4			—			2,319.4
Non-U.S. government-backed corporate	—		78.0			—			78.0
Foreign government	456.5		209.2			—			665.7
Asset-backed	—		143.5			—			143.5
Non-agency commercial mortgage-backed	—		44.8			—			44.8
Agency mortgage-backed	—		1,055.3			—			1,055.3
Total fixed income securities available for sale, at fair value	1,550.9		4,079.1			—			5,630.0
Short-term investments available for sale, at fair value	229.3		29.0			—			258.3
Equity investments available for sale, at fair value	109.9		—			—			109.9
Held for trading financial assets, at fair value
U.S. government	—		—			—			—
U.S. agency	—		0.2			—			0.2
Municipal	—		1.1			—			1.1
Corporate	—		529.8			—			529.8
Foreign government	36.1		104.0			—			140.1
Asset-backed	—		14.7			—			14.7
Bank loans	—		85.1			—			85.1
Catastrophe bonds trading, at fair value	—		34.8			—			34.8
Total fixed income securities trading, at fair value	36.1		769.7			—			805.8
Short-term investments trading, at fair value	0.1		0.1			—			0.2
Equity investments trading, at fair value	616.0		—			—			616.0
Other financial assets and liabilities, at fair value
Derivatives at fair value – foreign exchange contracts	—		7.9			—			7.9
Derivatives at fair value – interest rate swaps	—		0.1			—			0.1
Liabilities under derivative contracts – foreign exchange contracts	—		(14.3		)	—			(14.3		)
Loan notes issued by variable interest entities, at fair value	—		—			(70.7		)	(70.7		)
Loan notes issued by variable interest entities, at fair value (classified as a current liability)	—		—			(67.9		)	(67.9		)
Total	$	2,542.3	$	4,871.6		$	(138.6	)	$	7,275.3

Reconciliation of Liabilities Using Level 3 Inputs

The following tables present a reconciliation of the beginning and ending balances for all assets and liabilities measured at fair value on a recurring basis using Level 3 inputs for the three and six months ended June 30, 2015 and 2014:

Reconciliation of Liabilities Using Level 3 Inputs	Three Months Ended June 30, 2015			Three Months Ended June 30, 2014
	($ in millions)
Balance at the beginning of the period (1)	$	76.7		$	53.4
Distributed to third party	(2.2		)	—
Total change in fair value included in the statement of operations	3.3			2.6
Balance at the end of the period (1)	$	77.8		$	56.0

Reconciliation of Liabilities Using Level 3 Inputs	Six Months Ended June 30, 2015			Six Months Ended June 30, 2014
	($ in millions)
Balance at the beginning of the period (1)	$	138.6		$	50.0
Distributed to third party	(67.0		)	—
Total change in fair value included in the statement of operations	6.2			6.0
Balance at the end of the period (1)	$	77.8		$	56.0

⁽¹⁾ The amount classified as other payables was $1.6 million and $67.9 million as at June 30, 2015 and December 31, 2014, respectively.

Pricing Sources Used in Pricing Fixed Income Investments

Pricing sources used in pricing fixed income investments as at June 30, 2015 and December 31, 2014 were as follows:

	As at June 30, 2015		As at December 31, 2014
Index providers	83	%	84	%
Pricing services	12		11
Broker-dealers	5		5
Total	100	%	100	%

Summary of Securities Priced Using Pricing Information from Index Providers

A summary of securities priced using pricing information from index providers as at June 30, 2015 and December 31, 2014 is provided below:

	As at June 30, 2015				As at December 31, 2014
	Fair Market Value Determined using Prices from Index Providers		% of Total Fair Value by Security Type		Fair Market Value Determined using Prices from Index Providers		% of Total Fair Value by Security Type
	($ in millions, except for percentages)
U.S. government	$	1,040.5	97	%	$	1,044.4	95	%
U.S. agency	171.7		94	%	186.9		95	%
Municipal	12.5		42	%	13.7		42	%
Corporate	2,828.1		96	%	2,731.1		96	%
Non-U.S. government-backed corporate	35.9		46	%	48.7		62	%
Foreign government	460.9		58	%	504.4		63	%
Asset-backed	138.9		88	%	140.5		89	%
Non-agency commercial mortgage-backed	35.6		100	%	44.8		100	%
Agency mortgage-backed	624.3		62	%	680.6		64	%
Total fixed income securities	$	5,348.4	83	%	$	5,395.1	84	%
Equities	729.3		100	%	725.9		100	%
Total fixed income securities and equity investments	$	6,077.7	85	%	$	6,121.0	86	%

Long-term Debt Issued by Silverton

The observable and unobservable inputs used to determine the fair value of the 2015 Loan Notes and 2014 Loan Notes as at June 30, 2015 and December 31, 2014 are presented in the table below:

At June 30, 2015		Fair Value Level 3			Valuation Method	Observable (O) and  Unobservable (U) inputs	Low		High
	($ in millions)						($ in millions)
Loan notes held by third parties		$	77.8	(1)	Internal Valuation Model	Gross premiums written (O)	$	37.7	$	39.8
						Reserve for losses (U)	$	3.8	$	3.8
						Contract period (O)	N/A		365 days
						Initial value of issuance (O)	$	120.0	$	120.0

At December 31, 2014		Fair Value Level 3			Valuation Method	Observable (O) and  Unobservable (U) inputs	Low		High
	($ in millions)						($ in millions)
Loan notes held by third parties		$	138.6	(1)	Internal Valuation Model	Gross premiums written (O)	$	—	$	40.0
						Reserve for losses (U)	$	—	$	4.6
						Contract period (O)	N/A		365 days
						Initial value of issuance (O)	$	120.0	$	120.0

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Reinsurance - Narrative (Details)	Jun. 30, 2015	Dec. 31, 2014
Munich Re
Reinsurance [Line Items]
Concentrations of reinsurance recoverables	21.50%	18.60%
Lloyd's
Reinsurance [Line Items]
Concentrations of reinsurance recoverables	20.00%	27.30%
Arch Re
Reinsurance [Line Items]
Concentrations of reinsurance recoverables	8.90%	8.40%

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Investments - Other Investments (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening and closing undistributed value of investment	$ 8.7
Initial investment	0.8	$ 0.0
Closing value of investment as at June 30, 2015	9.5
MVI
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening and closing undistributed value of investment	0.0
Initial investment	0.8
Closing value of investment as at June 30, 2015	0.8
Chaspark
Equity Method Investment, Aggregate Cost [Roll Forward]
Opening and closing undistributed value of investment	8.7
Initial investment	0.0
Closing value of investment as at June 30, 2015	$ 8.7

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Deferred Policy Acquisition Costs (Tables)

6 Months Ended

Jun. 30, 2015

Insurance [Abstract]

Reconciliation of Beginning and Ending Deferred Policy Acquisition Costs

The following table represents a reconciliation of beginning and ending deferred policy acquisition costs for the three and six months ended June 30, 2015 and 2014:

		Three Months Ended June 30,						Six Months Ended June 30,
		2015			2014			2015			2014
		($ in millions)						($ in millions)
Balance at the beginning of the period		$	333.8		$	289.6		$	299.0		$	262.2
	Acquisition costs deferred	129.3			125.7			283.4			265.1
	Amortization of deferred policy acquisition costs	(114.1		)	(108.9		)	(233.4		)	(220.9		)
Balance at the end of the period		$	349.0		$	306.4		$	349.0		$	306.4

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Reserves for Losses and Loss Adjustment Expenses (Tables)

6 Months Ended

Jun. 30, 2015

Insurance [Abstract]

Reconciliation of Beginning and Ending Consolidated Loss and Loss Adjustment Expenses ("LAE") Reserves

The following table represents a reconciliation of beginning and ending consolidated loss and loss adjustment expenses (“LAE”) reserves for the six months ended June 30, 2015 and twelve months ended December 31, 2014:

	Six Months Ended June 30, 2015			Twelve Months Ended December 31, 2014
	($ in millions)
Provision for losses and LAE at the start of the year	$	4,750.8		$	4,678.9
Less reinsurance recoverable	(350.0		)	(332.7		)
Net loss and LAE at the start of the year	4,400.8			4,346.2
Net loss and LAE expenses (disposed)	—			(24.2		)
Provision for losses and LAE for claims incurred:
Current year	725.2			1,411.6
Prior years	(58.6		)	(104.1		)
Total incurred	666.6			1,307.5
Losses and LAE payments for claims incurred:
Current year	(33.1		)	(112.1		)
Prior years	(520.6		)	(995.6		)
Total paid	(553.7		)	(1,107.7		)
Foreign exchange (gains)	(35.1		)	(121.0		)
Net losses and LAE reserves at period end	4,478.6			4,400.8
Plus reinsurance recoverable on unpaid losses at period end	337.3			350.0
Provision for losses and LAE at the end of the relevant period	$	4,815.9		$	4,750.8

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Basis of Preparation

6 Months Ended

Jun. 30, 2015

Accounting Policies [Abstract]

Basis of Preparation

Basis of Preparation

The accompanying unaudited condensed consolidated financial statements have been prepared on the basis of generally accepted accounting principles in the United States (“U.S. GAAP”) for interim financial information and in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Results for the three and six months ended June 30, 2015 are not necessarily indicative of the results that may be expected for the year ended December 31, 2015. The unaudited condensed consolidated financial statements include the accounts of Aspen Holdings and its subsidiaries. All intercompany transactions and balances have been eliminated on consolidation.

The balance sheet as at December 31, 2014 has been derived from the audited consolidated financial statements at that date, but does not include all of the information and footnotes required by U.S. GAAP for complete financial statements. These unaudited condensed consolidated financial statements and notes thereto should be read in conjunction with the consolidated financial statements and notes thereto for the year ended December 31, 2014 contained in the Company’s Annual Report on Form 10-K filed with the United States Securities and Exchange Commission on February 23, 2015 (File No. 001-31909). There have been no changes to significant accounting policies from those disclosed in the Company’s Annual Report on Form 10-K.

Assumptions and estimates made by management have a significant effect on the amounts reported within the unaudited condensed consolidated financial statements. The most significant of these relate to losses and loss adjustment expenses, the value of investments, reinsurance recoverables and the fair value of derivatives. All material assumptions and estimates are regularly reviewed and adjustments made as necessary, but actual results could be significantly different from those expected when the assumptions or estimates were made.

Accounting Pronouncements Not Yet Adopted

On April 15, 2015, the Financial Accounting Standards Board (“FASB”) issued ASU 2015-04, “Compensation - Retirement Benefits (Topic 715)” which includes amendments that change the analysis that an entity must perform to determine whether it should consolidate certain types of legal entities. ASU 2015-02 is effective for fiscal years beginning after December 15, 2015. The Company does not expect this ASU to impact its consolidated financial statements as the Company does not possess a defined benefit pension plan.

On April 15, 2015, the FASB issued ASU 2015-05, “Intangibles - Goodwill and Other - Internal Use Software (Topic 350-40)” which will help entities evaluate the accounting for fees paid by a customer in a cloud computing arrangement. ASU 2015-05 is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2015. The Company does not expect this ASU to have a material impact on its consolidated financial statements.

On April 17, 2015, the FASB issued ASU 2015-03, “Interest - Imputation of Interest (Subtopic 835-30)” which requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. The ASU simplifies the presentation of debt issuance costs as part of FASB’s initiative to reduce complexity in accounting standards. ASU 2015-03 is effective for fiscal years beginning after December 15, 2015. The Company does not expect this ASU to have a material impact on its consolidated financial statements.

On April 30, 2015, the FASB issued ASU 2015-07, “Fair Value Measurement (Topic 820) Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent)” which removes the requirement to categorize within the fair value hierarchy all investments for which fair value is measured using the net asset value per share practical expedient. ASU 2015-07 is effective for annual periods beginning after December 15, 2015. The Company does not expect this ASU to have a material impact on its consolidated financial statements.

On May 8, 2015, the FASB issued ASU 2015-08, “Business Combinations (Topic 805) Pushdown Accounting” which conforms the FASB’s guidance on pushdown accounting with the SEC’s guidance. ASU 2015-08 is effective for annual periods beginning after December 15, 2015. The Company does not expect this ASU to have a material impact on its consolidated financial statements.

On May 21, 2015, the FASB issued ASU 2015-09, “Financial Services - Insurance (Topic 944) Disclosures About Short-Duration Contracts” which requires insurance entities to disclose additional information about the liability for unpaid claims and claim adjustment expenses, disclose information about significant changes in methodologies and assumptions used to calculate the liability for unpaid claims and claim adjustment expenses and disclose a rollforward of the liability for unpaid claims and claims adjustment expenses. ASU 2015-09 is effective for annual periods beginning after December 15, 2015 and interim periods within annual periods beginning after December 15, 2016. The Company does not expect this ASU to have a material impact on its consolidated financial results but it will have an impact on the disclosures in the Company’s Quarterly reports on Form 10-Q and Annual report on Form 10-K.

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Capital Structure (Tables)

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Summary of Authorized and Issued Share Capital

The following table provides a summary of the Company’s authorized and issued share capital as at June 30, 2015 and December 31, 2014:

	As at June 30, 2015		As at December 31, 2014
	Number	$ in Thousands	Number	$ in Thousands
Authorized share capital:
Ordinary Shares 0.15144558¢ per share	969,629,030	1,469	969,629,030	1,469
Non-Voting Shares 0.15144558¢ per share	6,787,880	10	6,787,880	10
Preference Shares 0.15144558¢ per share	100,000,000	152	100,000,000	152
Total authorized share capital		1,631		1,631
Issued share capital:
Issued ordinary shares of 0.15144558¢ per share	60,777,875	92	62,017,368	94
Issued 7.401% preference shares of 0.15144558¢ each with a liquidation preference of $25 per share	5,327,500	8	5,327,500	8
Issued 7.250% preference shares of 0.15144558¢ each with a liquidation preference of $25 per share	6,400,000	10	6,400,000	10
Issued 5.95% preference shares of 0.15144558¢ each with a liquidation preference of $25 per share	11,000,000	17	11,000,000	17
Total issued share capital		127		129

Summary of Ordinary Shares

The following table summarizes transactions in the Company’s ordinary shares during the six months ended June 30, 2015:

	Number of Ordinary Shares
Ordinary shares in issue at December 31, 2014	62,017,368
Ordinary share transactions in the six months ended June 30, 2015
Ordinary shares issued to employees under the 2003 and 2013 share incentive plans and/or 2008 share purchase plan	544,034
Ordinary shares issued to non-employee directors	6,806
Ordinary shares repurchased	(1,790,333	)
Ordinary shares in issue at June 30, 2015	60,777,875

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Investments - Summary of Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total	$ 49.8	$ 49.6	$ 100.1	$ 101.4
Investment expenses	(3.1)	(3.5)	(6.0)	(5.8)
Net investment income	46.7	46.1	94.1	95.6
Fixed income securities — Available for sale
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total	35.5	37.3	70.7	75.8
Fixed income securities — Trading
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total	6.9	6.6	13.9	13.2
Short-term investments — Available for sale
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total	0.2	0.3	0.6	0.6
Fixed term deposits (included in cash and cash equivalents)
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total	0.9	1.1	2.0	1.9
Equity securities — Available for sale
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total	0.1	1.0	0.1	2.5
Equity securities — Trading
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total	5.7	3.1	11.9	7.0
Catastrophe bonds — Trading
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Total	$ 0.5	$ 0.2	$ 0.9	$ 0.4

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Fair Value Measurements - Summary of Securities Priced Using Pricing Information from Index Providers (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Fair Value [Line Items]
Fair Market Value Determined using Prices from Index Providers	$ 6,077.7	$ 6,121.0
% of Total Fair Value by Security Type	85.00%	86.00%
Fixed Income Maturities
Fair Value [Line Items]
Fair Market Value Determined using Prices from Index Providers	$ 5,348.4	$ 5,395.1
% of Total Fair Value by Security Type	83.00%	84.00%
Fixed Income Maturities | U.S. government
Fair Value [Line Items]
Fair Market Value Determined using Prices from Index Providers	$ 1,040.5	$ 1,044.4
% of Total Fair Value by Security Type	97.00%	95.00%
Fixed Income Maturities | U.S. agency
Fair Value [Line Items]
Fair Market Value Determined using Prices from Index Providers	$ 171.7	$ 186.9
% of Total Fair Value by Security Type	94.00%	95.00%
Fixed Income Maturities | Municipal
Fair Value [Line Items]
Fair Market Value Determined using Prices from Index Providers	$ 12.5	$ 13.7
% of Total Fair Value by Security Type	42.00%	42.00%
Fixed Income Maturities | Corporate
Fair Value [Line Items]
Fair Market Value Determined using Prices from Index Providers	$ 2,828.1	$ 2,731.1
% of Total Fair Value by Security Type	96.00%	96.00%
Fixed Income Maturities | Foreign Corporate Debt Securities [Member]
Fair Value [Line Items]
Fair Market Value Determined using Prices from Index Providers	$ 35.9	$ 48.7
% of Total Fair Value by Security Type	46.00%	62.00%
Fixed Income Maturities | Foreign government
Fair Value [Line Items]
Fair Market Value Determined using Prices from Index Providers	$ 460.9	$ 504.4
% of Total Fair Value by Security Type	58.00%	63.00%
Fixed Income Maturities | Asset-backed
Fair Value [Line Items]
Fair Market Value Determined using Prices from Index Providers	$ 138.9	$ 140.5
% of Total Fair Value by Security Type	88.00%	89.00%
Fixed Income Maturities | Non-agency commercial mortgage-backed
Fair Value [Line Items]
Fair Market Value Determined using Prices from Index Providers	$ 35.6	$ 44.8
% of Total Fair Value by Security Type	100.00%	100.00%
Fixed Income Maturities | Agency mortgage-backed
Fair Value [Line Items]
Fair Market Value Determined using Prices from Index Providers	$ 624.3	$ 680.6
% of Total Fair Value by Security Type	62.00%	64.00%
Equities
Fair Value [Line Items]
Fair Market Value Determined using Prices from Index Providers	$ 729.3	$ 725.9
% of Total Fair Value by Security Type	100.00%	100.00%

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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Investments:
Fixed income securities, available for sale at fair value (amortized cost — $5,512.8 and $5,462.9)	$ 5,629.7	$ 5,630.0
Fixed income securities, trading at fair value (amortized cost — $771.4 and $760.9)	777.7	771.0
Equity securities, available for sale at fair value (cost — $Nil and $82.6)	0.0	109.9
Equity securities, trading at fair value (cost — $717.5 and $585.2)	729.3	616.0
Short-term investments, available for sale at fair value (amortized cost — $184.0 and $258.2)	184.1	258.3
Short-term investments, trading at fair value (amortized cost — $1.1 and $0.2)	1.1	0.2
Catastrophe bonds, trading at fair value (cost — $32.6 and $34.4)	32.3	34.8
Other investments, equity method	9.5	8.7
Total investments	7,363.7	7,428.9
Cash and cash equivalents (including $100.3 and $176.7 within consolidated variable interest entities)	1,148.4	1,178.5
Reinsurance recoverables
Unpaid losses	337.3	350.0
Ceded unearned premiums	257.1	206.8
Receivables
Underwriting premiums	1,249.9	1,011.7
Other	108.1	90.2
Funds withheld	44.5	46.9
Deferred policy acquisition costs	349.0	299.0
Derivatives at fair value	4.1	8.0
Receivable for securities sold	5.5	2.3
Office properties and equipment	65.6	62.2
Deferred taxation	0.9	0.0
Other assets	1.9	13.6
Intangible assets	18.2	18.2
Total assets	10,954.2	10,716.3
Insurance reserves
Losses and loss adjustment expenses	4,815.9	4,750.8
Unearned premiums	1,702.8	1,441.8
Total insurance reserves	6,518.7	6,192.6
Payables
Reinsurance premiums	164.5	92.0
Current taxation	25.9	18.3
Deferred taxation	6.2	3.1
Accrued expenses and other payables	242.7	356.9
Liabilities under derivative contracts	7.2	14.3
Total payables	446.5	484.6
Loan notes issued by variable interest entities, at fair value	76.2	70.7
Long-term debt	549.2	549.1
Total liabilities	7,590.6	7,297.0
Commitments and contingent liabilities (see Note 16)	0.0	0.0
SHAREHOLDERS’ EQUITY
Ordinary shares, value	0.1	0.1
Preference shares:
Non-controlling interest	1.0	0.5
Additional paid-in capital	1,061.7	1,134.3
Retained earnings	2,182.3	2,050.1
Accumulated other comprehensive income, net of taxes	118.5	234.3
Total shareholders’ equity	3,363.6	3,419.3
Total liabilities and shareholders’ equity	10,954.2	10,716.3
5.95% preference shares
Preference shares:
Preference shares, value	0.0	0.0
7.401% preference shares
Preference shares:
Preference shares, value	0.0	0.0
7.250% preference shares
Preference shares:
Preference shares, value	$ 0.0	$ 0.0

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Investments - Summary of Fixed Maturities (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	$ 5,512.8	$ 5,462.9
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	5,696.8	5,803.7
Available for sale investments in fixed income maturities, Fair Market Value	5,629.7	5,630.0
Total fixed income securities — Available for sale
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	5,512.8	5,462.9
Non-agency commercial mortgage-backed
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	33.4	41.5
Available for sale investments in fixed income maturities, Fair Market Value	$ 35.6	$ 44.8
Available for sale investments Average Ratings by Maturity	AA+	AA+
Agency mortgage-backed
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	$ 981.9	$ 1,016.7
Available for sale investments in fixed income maturities, Fair Market Value	$ 1,008.5	$ 1,055.3
Available for sale investments Average Ratings by Maturity	AA+	AA+
Asset-backed
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	$ 136.6	$ 141.3
Available for sale investments in fixed income maturities, Fair Market Value	$ 138.7	$ 143.5
Available for sale investments Average Ratings by Maturity	AAA	AAA
Total fixed income securities — Available for sale
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Due one year or less, Cost or Amortized Cost	$ 632.9	$ 590.2
Due after one year through five years, Cost or Amortized Cost	2,575.0	2,552.0
Due after five years through ten years, Cost or Amortized Cost	1,064.3	1,023.5
Due after ten years, Cost or Amortized Cost	88.7	97.7
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	4,360.9	4,263.4
Due one year or less, Fair Market Value	638.4	594.7
Due after one year through five years, Fair Market Value	2,636.3	2,620.8
Due after five years through ten years, Fair Market Value	1,077.3	1,059.9
Due after ten years, Fair Market Value	94.9	111.0
Available for sale investments in fixed income maturities, Fair Market Value	$ 4,446.9	$ 4,386.4
Due one year or less, Average Ratings by Maturity	AA	AA
Due after one year through five years, Average Ratings by Maturity	AA-	AA-
Due after five years through ten years, Average Ratings by Maturity	A+	A+
Due after ten years, Average Ratings by Maturity	A+	A+

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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 177.0	$ 251.2
Net profit attributable to non-controlling interest	(0.5)	(0.1)
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	15.0	18.7
Share-based compensation	7.1	8.4
Realized and unrealized investment (gains)	(70.9)	(52.5)
Realized and unrealized investment losses	43.3	7.6
Change in fair value of loan notes issued by variable interest entities	6.2	6.0
Net realized and unrealized investment foreign exchange losses	12.4	21.3
Loss on derivative contracts	2.7	0.0
Insurance reserves:
Losses and loss adjustment expenses	90.9	96.5
Unearned premiums	235.6	286.0
Reinsurance recoverables:
Unpaid losses	11.5	(24.6)
Ceded unearned premiums	(50.4)	(64.7)
Other receivables	(20.9)	(16.1)
Deferred policy acquisition costs	(49.7)	(44.1)
Reinsurance premiums payable	73.1	(20.6)
Funds withheld	2.4	(1.3)
Premiums receivable	(249.8)	(196.4)
Deferred taxes	7.2	(0.1)
Income tax payable	(4.8)	11.7
Accrued expenses and other payables	(40.6)	15.0
Fair value of derivatives and settlement of liabilities under derivatives	(3.2)	7.9
Long-term debt	0.1	0.1
Intangible assets	0.0	0.1
Other assets	10.7	(2.1)
Net cash generated by operating activities	204.4	307.9
Cash flows (used in) investing activities:
(Purchases) of fixed income securities — Available for sale	(939.3)	(918.1)
(Purchases) of fixed income securities — Trading	(275.5)	(398.9)
Proceeds from sales and maturities of fixed income securities — Available for sale	861.5	1,015.9
Proceeds from sales and maturities of fixed income securities — Trading	264.5	372.2
(Purchases) of equity securities — Trading	(268.9)	(118.9)
Net proceeds/(purchases) of catastrophe bonds — Trading	(1.8)	24.3
Proceeds from sales of equity securities — Available for sale	108.6	15.6
Proceeds from sales of equity securities — Trading	151.1	18.2
(Purchases) of short-term investments — Available for sale	(109.3)	(268.9)
Sale of short-term investments — Available for sale	172.4	92.9
(Purchases) of short-term investments — Trading	(15.7)	(80.2)
Sale of short-term investments — Trading	14.8	66.2
Net change in receivable for securities sold	5.8	19.8
Proceeds from other investments	0.0	37.3
(Purchases) of equipment	(6.0)	(10.2)
Investment in Micro-insurance venture	(0.8)	0.0
Net cash (used in) investing activities	(35.0)	(181.4)
Cash flows (used in) financing activities:
Proceeds from the issuance of ordinary shares, net of issuance costs	4.0	1.8
Ordinary shares repurchased	(83.7)	(30.9)
Repayment of long-term debt issued by Silverton	(67.0)	0.0
Dividends paid on ordinary shares	(25.4)	(24.8)
Dividends paid on preference shares	(18.9)	(18.9)
Net cash (used in) financing activities	(191.0)	(72.8)
Effect of exchange rate movements on cash and cash equivalents	(8.5)	(2.1)
(Decrease)/Increase in cash and cash equivalents	(30.1)	51.6
Cash and cash equivalents at beginning of period	1,178.5	1,293.6
Cash and cash equivalents at end of period	1,148.4	1,345.2
Supplemental disclosure of cash flow information:
Net cash (received)/paid during the period for income tax	(4.0)	4.0
Cash paid during the period for interest	$ 14.5	$ 14.6

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Derivative Contracts - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended			12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Cash collateral provided	$ 15,900,000		$ 15,900,000			$ 22,300,000
Pledged assets	0		0			0
Goldman Sachs International
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	451,300,000		451,300,000
Credit Agricole CIB
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	500,000,000		500,000,000
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contract settlement	100,000	$ 0
Foreign Exchange Contracts | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	0		0			135,800,000
Foreign exchange contract settlement	100,000	0	(2,700,000)		$ 0
Cash collateral provided	3,200,000.0		3,200,000.0			0
Foreign Exchange Contracts | Designated as Hedging Instrument | Change in Fair Value of Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Fair Value	5,100,000	0	2,700,000		0
Foreign Exchange Contracts | Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	428,500,000		428,500,000			403,400,000
Foreign Exchange Contracts | Derivatives Not Designated as Hedging Instruments | Change in Fair Value of Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	2,200,000	(1,100,000)	(2,400,000)		1,900,000
Foreign Exchange Contracts | Derivatives at Fair Value [Member] | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	56,400,000		56,400,000			0
Fair Value			2.1	[1]		0
Foreign Exchange Contracts | Derivatives at Fair Value [Member] | Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	145,000,000		145,000,000			165,800,000
Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Other assets pledged	0		0
Interest Rate Swaps | Derivatives Not Designated as Hedging Instruments | Change in Fair Value of Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	(200,000)	$ (3,500,000)	(3,400,000)		$ (5,400,000)
Interest Rate Swaps | Derivatives at Fair Value [Member] | Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	$ 951,300,000		$ 951,300,000			$ 951,300,000

[1] Net of $3.2 million cash collateral (December 31, 2014 — $Nil).

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Reclassifications from Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income Reclassification (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Available for sale securities:
Realized gains on sale of securities	$ 2.1	$ 3.7	$ 35.6	$ 6.7
Realized (losses) on sale of securities	(2.7)	(1.8)	(3.9)	(4.4)
Net realized and unrealized investment gains reclassified to the statement of operations, gross of tax	(0.6)	1.9	31.7	2.3
Tax on net realized gains of securities	0.0	0.1	(0.4)	(0.1)
Total reclassifications from AOCI to the statement of operations, net of tax	(0.6)	2.0	31.3	2.2
Change in foreign currency translation adjustment	(0.5)	0.0	1.1	0.0
Foreign currency translation adjustments, Net income	(0.5)	0.0	1.1	0.0
Reclassification adjustment for net realized losses/(gains) on investments included in net income	0.1	0.0	(2.7)	0.0
Realized derivatives, Net income	(0.1)	0.0
Total reclassifications from AOCI to the statement of operations, net of tax, Net income	$ (1.0)	$ 2.0	$ 29.7	$ 2.2

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Capital Structure - Narrative (Details) - Class of Stock [Domain] - USD ($)			3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 05, 2015	Apr. 17, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Class of Stock [Line Items]
Additional paid-in capital			$ 1,061,700,000		$ 1,061,700,000		$ 1,134,300,000
Aggregate liquidation preferences			$ 568,200,000		568,200,000		568,200,000
Issuance costs					$ 12,400,000		$ 12,400,000
Convertible preferred stock, shares issued upon conversion (in shares)		0.001
Class of warrant or right, exercise price of warrants or rights (in usd per share)		$ 160
Number of days rights are not exercisable until beneficial ownership percentage is announced		10 days
Equity method investment, ownership percentage		10.00%
Minimum period before exercisable		10 days
Repurchase Program 2015
Class of Stock [Line Items]
Share Repurchase Agreement, commenced date	Feb. 05, 2015
Existing share repurchase authorization amount	$ 500,000,000
Open Markets
Class of Stock [Line Items]
Shares repurchase and cancelled during period (in shares)			1,003,195	0	1,790,333	770,505
Shares repurchase and cancelled during period, value			$ 47,200,000	$ 0	$ 83,700,000	$ 30,900,000
Average price (in usd per share)			$ 47.06	$ 0	$ 46.74	$ 40.08
Passive Institutional Investors
Class of Stock [Line Items]
Equity method investment, ownership percentage		15.00%
Preference shares
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion (in shares)		1

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Commitments and Contingent Liabilities

6 Months Ended

Jun. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingent Liabilities

Commitments and Contingent Liabilities

(a) Restricted assets

The Company is obliged by the terms of its contractual obligations to U.S. policyholders and by obligations to certain regulatory authorities to facilitate issue of letters of credit or maintain certain balances in trust funds for the benefit of policyholders.

The following table details the forms and value of the Company’s restricted assets as at June 30, 2015 and December 31, 2014:

	As at June 30, 2015			As at December 31, 2014
	($ in millions, except percentages)
Regulatory trusts and deposits:
Affiliated transactions	$	978.9		$	1,086.9
Third party	2,182.1			2,183.4
Letters of credit / guarantees(1)	710.5			778.7
Total restricted assets	$	3,871.5		$	4,049.0
Total as percent of cash and invested assets	45.5		%	47.0		%

⁽¹⁾  As of June 30, 2015, the Company had pledged funds of $701.3 million and £9.2 million (December 31, 2014 — $764.4 million and £9.2 million) as collateral for the secured letters of credit.

Funds at Lloyd’s. AUL operates at Lloyd’s as the corporate member for Syndicate 4711. Lloyd’s determines Syndicate 4711’s required regulatory capital principally through the syndicate’s annual business plan. Such capital, called Funds at Lloyd’s, comprises cash and investments as at June 30, 2015 in the amount of $413.3 million (December 31, 2014 — $411.9 million).

The amounts provided as Funds at Lloyd’s will be drawn upon and become a liability of the Company in the event of Syndicate 4711 declaring a loss at a level that cannot be funded from other resources, or if Syndicate 4711 requires funds to cover a short term liquidity gap. The amount which the Company provides as Funds at Lloyd’s is not available for distribution to the Company for the payment of dividends. Aspen Managing Agency Limited, the managing agent to Syndicate 4711, is also required by Lloyd’s to maintain a minimum level of capital which as at June 30, 2015 was £0.4 million (December 31, 2014 — £0.4 million). This is not available for distribution by the Company for the payment of dividends.

Letters of Credit Facility. On June 30, 2014, Aspen Bermuda and Citibank Europe plc (“Citi Europe”) replaced an existing letter of credit facility, dated July 30, 2012, in a maximum aggregate amount of up to $950.0 million (the “LOC Facility”) comprised of two maturity tranches (Tranche I with a limit of $650.0 million and Tranche II with a limit of $300.0 million) which expired on its own terms on June 30, 2014. The LOC Facility was replaced with a new letter of credit facility in a maximum aggregate amount of up to $575.0 million (the “New LOC Facility”). Under the New LOC Facility, which will expire on June 30, 2016, Aspen Bermuda will pay to Citi Europe (a) a letter of credit fee based on the available amounts of each letter of credit and (b) a commitment fee, which varies based upon usage, on the unutilized portion of the New LOC Facility. Aspen Bermuda will also pay interest on the amount drawn by any beneficiary under a credit provided under the New LOC Facility at a rate per annum of LIBOR plus 1% (plus reserve asset costs, if any) from the date of drawing until the date of reimbursement by Aspen Bermuda. The New LOC Facility is used to secure obligations of Aspen Bermuda to its policyholders. In addition to the New LOC Facility, we also use regulatory trusts to secure our obligations to policyholders.

The terms of a Pledge Agreement between Aspen Bermuda and Citi Europe (pursuant to an Assignment Agreement dated October 11, 2006) dated January 17, 2006, as amended, were also amended on June 30, 2014 to change the types of securities or other assets that are acceptable as collateral under the New LOC Facility. All other agreements relating to Aspen Bermuda’s LOC Facility, which now apply to the New LOC Facility with Citi Europe, as previously filed with the United States Securities and Exchange Commission, remain in full force and effect.

On December 18, 2014, Aspen Bermuda and Citi Europe entered into an amended and restated pledge agreement (“Pledge Agreement”) to, among other things, (i) change the types of securities or other assets that qualify as collateral pledged under the Pledge Agreement, (ii) provide Aspen Bermuda the right to give certain directions or entitlement orders to The Bank of New York Mellon (“BNY Mellon”), as securities intermediary, relating to the collateral without the consent of Citi Europe provided certain conditions are satisfied, (iii) provide Citi Europe, subject to the provisions set forth in the amended and restated account control agreement, dated December 18, 2014 (the “Control Agreement”), among Aspen Bermuda, Citi Europe and BNY Mellon, with the right and power to exercise exclusive control over the accounts set forth in the Control Agreement and (iv) provide a schedule of currency margins such that if the collateral is denominated in a currency other than the credit currency the collateral shall be reduced by a specified percentage.

On December 12, 2014, Aspen Holdings and certain of its subsidiaries (the “Borrowers”) entered into a first amendment to an amended and restated credit agreement, dated June 12, 2013, with various lenders and Barclays Bank Plc, as administrative agent (“Barclays”). Aspen Holdings has recently established, and may establish additional, special purpose entities that have issued or will issue insurance-linked securities to third-party investors (each, an “ILS Entity” and collectively, the “ILS Entities”). Accordingly, the amended and restated credit agreement was amended, among other things, to (i) exclude ILS Entities from the definition of “Subsidiary”, (ii) permit the Borrowers to invest in ILS Entities and (iii) permit the Borrowers to engage in transactions with an ILS Entity.

Aspen U.K. and Aspen Bermuda have a $100.0 million secured letter of credit facility agreement with Barclays. All letters of credit issued under the facility are used to support reinsurance obligations of the parties to the agreement and their respective subsidiaries. The Company did not extend the maturity date of the Barclays secured letter of credit facility and, as a result, it expired on January 31, 2015 and no new letters of credit can be issued under this facility. As at June 30, 2015, the Company had no outstanding collateralized letters of credit under this facility (December 31, 2014 — $5.0 million).

For further information relating to the Company’s credit facilities, refer to Note 23 of the “Notes to Audited Consolidated Financial Statements” in the Company’s 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission.

Interest Rate Swaps. As at June 30, 2015, cash collateral with a fair value of $15.9 million was held by the Company’s counterparties to support the current valuation of the interest rate swaps (December 31, 2014 — $22.3 million). For more information, refer to Note 10 of these unaudited condensed consolidated financial statements.

(b) Operating leases

Amounts outstanding under operating leases net of subleases as of June 30, 2015 were:

	2015		2016		2017		2018		2019		Later Years		Total
	($ in millions)
Operating Lease Obligations	$	6.8	$	9.8	$	8.5	$	7.0	$	6.1	$	12.9	$	51.1

(c) Contingent liabilities

In common with the rest of the insurance and reinsurance industry, the Company is subject to litigation and arbitration in the ordinary course of business. The Company’s Operating Subsidiaries are regularly engaged in the investigation, conduct and defense of disputes, or potential disputes, resulting from questions of insurance or reinsurance coverage or claims activities. Pursuant to insurance and reinsurance arrangements, many of these disputes are resolved by arbitration or other forms of alternative dispute resolution. Such legal proceedings are considered in connection with estimating the Company’s Insurance Reserves — Loss and Loss Adjustment Expenses, as provided on the Company’s consolidated balance sheet.

In some jurisdictions, notably the U.S., a failure to deal with such disputes or potential disputes in an appropriate manner could result in an award of “bad faith” punitive damages against the Company’s Operating Subsidiaries. In accordance with ASC 450-20-50-4b, for (a) reasonably possible losses for which no accrual is made because any of the conditions for accrual in ASC 450-20-25-2 are not met and (b) reasonably possible losses in excess of the amounts accrued pursuant to ASC 450-20-30-1, the Company will provide an estimate of the possible loss or range of possible loss or state that such an estimate cannot be made.

As of June 30, 2015, based on available information, it was the opinion of the Company’s management that the probability of the ultimate resolution of pending or threatened litigation or arbitrations having a material effect on the Company’s financial condition, results of operations or liquidity would be remote.

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Earnings per Ordinary Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income		$ 49.0	$ 130.8	$ 177.0	$ 251.2
Preference share dividends		(9.4)	(9.4)	(18.9)	(18.9)
Net profit attributable to non-controlling interest		(0.5)	0.0	(0.5)	(0.1)
Basic and diluted net income available to ordinary shareholders		$ 39.1	$ 121.4	$ 157.6	$ 232.2
Ordinary shares:
Basic weighted average ordinary shares		61,408,633	65,447,128	61,775,646	65,368,675
Weighted average effect of dilutive securities (in shares)	[1]	1,488,274	1,253,240	1,389,217	1,277,644
Total diluted weighted average ordinary shares		62,896,907	66,700,368	63,164,863	66,646,319
Earnings per ordinary share:
Basic (in usd per share)		$ 0.64	$ 1.85	$ 2.55	$ 3.55
Diluted (in usd per share)		$ 0.62	$ 1.82	$ 2.50	$ 3.48

[1] Dilutive securities comprise: employee options, restricted share units and performance shares associated with the Company’s long term incentive plan, employee share purchase plans and director restricted stock units and options as described in Note 14.

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Reclassifications from Accumulated Other Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income Reclassification

The following table sets out the components of the Company’s accumulated other comprehensive income (“AOCI”) that are reclassified into the unaudited condensed consolidated statement of operations for the three and six months ended June 30, 2015 and 2014:

	Amount Reclassified from AOCI
Details about the AOCI Components	Three Months Ended June 30, 2015			Three Months Ended June 30, 2014			Affected Line Item in the Unaudited Condensed Consolidated Statement of Operations
	($ in millions)
Available for sale securities:
Realized gains on sale of securities	$	2.1		$	3.7		Realized and unrealized investment gains
Realized (losses) on sale of securities	(2.7		)	(1.8		)	Realized and unrealized investment losses
	(0.6		)	1.9			Income from operations before income tax
Tax on net realized gains of securities	—			0.1			Income tax expense
	$	(0.6	)	$	2.0		Net income
Foreign currency translation adjustments:
Foreign currency translation adjustments, before tax	(0.5		)	$	—		Net realized and unrealized foreign exchange gains/(losses)
	$	(0.5	)	$	—		Net income
Realized derivatives:
Net realized gains on settled derivatives	0.1			$	—		General, administrative and corporate expenses
	$	0.1		$	—		Net income
Total reclassifications from AOCI to the statement of operations, net of tax	$	(1.0	)	$	2.0		Net income

	Amount Reclassified from AOCI
Details about the AOCI Components	Six Months Ended June 30, 2015			Six Months Ended June 30, 2014			Affected Line Item in the Unaudited Condensed Consolidated Statement of Operations
	($ in millions)
Available for sale securities:
Realized gains on sale of securities	$	35.6		$	6.7		Realized and unrealized investment gains
Realized (losses) on sale of securities	(3.9		)	(4.4		)	Realized and unrealized investment losses
	31.7			2.3			Income from operations before income tax
Tax on net realized gains of securities	(0.4		)	(0.1		)	Income tax expense
Total reclassifications from AOCI to the statement of operations, net of tax	$	31.3		$	2.2		Net income
Foreign currency translation adjustments:
Foreign currency translation adjustments, before tax	1.1			$	—		Net realized and unrealized foreign exchange gains/(losses)
	$	1.1		$	—		Net income
Realized derivatives:
Net realized (losses) on settled derivatives	(2.7		)	$	—		General, administrative and corporate expenses
	$	(2.7	)	$	—		Net income
Total reclassifications from AOCI to the statement of operations, net of tax	$	29.7		$	2.2		Net income

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Intangible Assets - Narrative (Details) - USD ($) $ in Millions		6 Months Ended	12 Months Ended
	Apr. 05, 2005	Jun. 30, 2015	Dec. 31, 2010	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]
Value of the asset		$ 18.2		$ 18.2	$ 18.2	$ 18.2	$ 18.3	$ 18.4
Acquired licenses			$ 3.6
Fair value of tangible and financial assets, net			1.2
Asset amortization period		5 years
Aspen U.K.
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]
Aggregate consideration for sale and purchase agreement	$ 1.6
APJ Continuation Limited
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]
Aggregate consideration for sale and purchase agreement			4.8
Trade Mark
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]
Value of the asset		$ 1.6		1.6	1.6	1.6	1.6	1.6
Insurance Licenses
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]
Value of the asset		16.6		16.6	16.6	16.6	16.6	16.6
Insurance Licenses | Aspen U.K.
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]
Acquired licenses		2.1
Insurance Licenses | AAIC
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]
Acquired licenses		10.0
Insurance Licenses | Aspen Specialty
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]
Acquired licenses		4.5
Intangible Asset: Renewal Rights and Distribution Channels
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]
Acquired licenses			2.2
Intangible Asset: Lock-in Period
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]
Acquired licenses			$ 1.4
Other
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]
Value of the asset		$ 0.0		$ 0.0	$ 0.0	$ 0.0	$ 0.1	$ 0.2

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History and Organization

6 Months Ended

Jun. 30, 2015

Accounting Policies [Abstract]

History and Organization

History and Organization

Aspen Insurance Holdings Limited (“Aspen Holdings”) was incorporated on May 23, 2002 and holds subsidiaries that provide insurance and reinsurance on a worldwide basis. Its principal operating subsidiaries are Aspen Insurance UK Limited (“Aspen U.K.”), Aspen Bermuda Limited (“Aspen Bermuda”), Aspen Specialty Insurance Company (“Aspen Specialty”), Aspen American Insurance Company (“AAIC”) and Aspen Underwriting Limited (corporate member of Lloyd’s Syndicate 4711, “AUL”) (collectively, the “Operating Subsidiaries”). We also established Aspen Capital Management, Ltd and other related entities (collectively, “ACM”) to leverage our existing underwriting franchise, increase our operational flexibility in the capital markets and provide investors direct access to our underwriting expertise. In such regard, Silverton Re Ltd. (“Silverton”), a sidecar, was established in 2013 to attract third-party capital and to provide additional collateralized capacity to support Aspen Re’s global reinsurance business. References to the “Company,” “we,” “us” or “our” refer to Aspen Holdings or Aspen Holdings and its subsidiaries.

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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Fixed income securities, available for sale, amortized cost	$ 5,512.8	$ 5,462.9
Fixed income securities, trading at fair value, amortized cost	771.4	760.9
Equity securities, available for sale at fair value, cost	0.0	82.6
Equity securities, trading at fair value, cost	717.5	585.2
Short-term investments, available for sale at fair value, amortized cost	184.0	258.2
Short-term investments, trading at fair value, amortized cost	1.1	0.2
Catastrophe bonds, trading at fair value, cost	32.6	34.4
Cash and cash equivalents (including $100.3 and $176.7 within consolidated variable interest entities)	$ 1,148.4	$ 1,178.5
Ordinary shares, par value (in usd per share)	$ 0.15144558	$ 0.15144558
Ordinary shares, issued (in shares)	60,777,875	62,017,368
Preference shares, par value (in usd per share)	$ 0.15144558	$ 0.15144558
5.95% preference shares
Preference shares, issued (in shares)	11,000,000	11,000,000
Preference shares, rate	5.95%	5.95%
Preference shares, par value (in usd per share)	$ 0.15144558	$ 0.15144558
7.401% preference shares
Preference shares, issued (in shares)	5,327,500	5,327,500
Preference shares, rate	7.401%	7.401%
Preference shares, par value (in usd per share)	$ 0.15144558	$ 0.15144558
7.250% preference shares
Preference shares, issued (in shares)	6,400,000	6,400,000
Preference shares, rate	7.25%	7.25%
Preference shares, par value (in usd per share)	$ 0.15144558	$ 0.15144558
Variable Interest Entity, Primary Beneficiary
Cash and cash equivalents (including $100.3 and $176.7 within consolidated variable interest entities)	$ 100.3	$ 176.7

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Deferred Policy Acquisition Costs

6 Months Ended

Jun. 30, 2015

Insurance [Abstract]

Deferred Policy Acquisition Costs

Deferred Policy Acquisition Costs

The following table represents a reconciliation of beginning and ending deferred policy acquisition costs for the three and six months ended June 30, 2015 and 2014:

		Three Months Ended June 30,						Six Months Ended June 30,
		2015			2014			2015			2014
		($ in millions)						($ in millions)
Balance at the beginning of the period		$	333.8		$	289.6		$	299.0		$	262.2
	Acquisition costs deferred	129.3			125.7			283.4			265.1
	Amortization of deferred policy acquisition costs	(114.1		)	(108.9		)	(233.4		)	(220.9		)
Balance at the end of the period		$	349.0		$	306.4		$	349.0		$	306.4

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Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 24, 2015
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Trading Symbol	AHL
Entity Registrant Name	ASPEN INSURANCE HOLDINGS LTD
Entity Central Index Key	0001267395
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		60,777,875

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Reserves for Losses and Loss Adjustment Expenses

6 Months Ended

Jun. 30, 2015

Insurance [Abstract]

Reserves for Losses and Loss Adjustment Expenses

Reserves for Losses and Loss Adjustment Expenses

The following table represents a reconciliation of beginning and ending consolidated loss and loss adjustment expenses (“LAE”) reserves for the six months ended June 30, 2015 and twelve months ended December 31, 2014:

	Six Months Ended June 30, 2015			Twelve Months Ended December 31, 2014
	($ in millions)
Provision for losses and LAE at the start of the year	$	4,750.8		$	4,678.9
Less reinsurance recoverable	(350.0		)	(332.7		)
Net loss and LAE at the start of the year	4,400.8			4,346.2
Net loss and LAE expenses (disposed)	—			(24.2		)
Provision for losses and LAE for claims incurred:
Current year	725.2			1,411.6
Prior years	(58.6		)	(104.1		)
Total incurred	666.6			1,307.5
Losses and LAE payments for claims incurred:
Current year	(33.1		)	(112.1		)
Prior years	(520.6		)	(995.6		)
Total paid	(553.7		)	(1,107.7		)
Foreign exchange (gains)	(35.1		)	(121.0		)
Net losses and LAE reserves at period end	4,478.6			4,400.8
Plus reinsurance recoverable on unpaid losses at period end	337.3			350.0
Provision for losses and LAE at the end of the relevant period	$	4,815.9		$	4,750.8

For the six months ended June 30, 2015, there was a reduction of $58.6 million in the Company’s estimate of the ultimate claims to be paid in respect of prior accident years compared to a reduction of $60.0 million for the six months ended June 30, 2014. The Company has not assumed any loss reserves as part of any transaction and there have been no disposals of transfers of reserves relating to commutations during the six months ended June 30, 2015 (six months ended June 30, 2014 — $24.2 million). For additional information on the reserve releases, please refer to “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Reserves for Losses and Loss Adjustment Expenses” below.

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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND OTHER COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues
Net earned premium	$ 609.4	$ 616.2	$ 1,203.0	$ 1,182.7
Net investment income	46.7	46.1	94.1	95.6
Realized and unrealized investment gains	13.5	34.6	70.9	52.5
Other income	(1.2)	3.2	2.7	3.8
Total revenues	668.4	700.1	1,370.7	1,334.6
Expenses
Losses and loss adjustment expenses	360.5	337.1	666.6	625.2
Amortization of deferred policy acquisition costs	114.1	108.9	233.4	220.9
General, administrative and corporate expenses	95.4	108.8	197.6	204.4
Interest on long-term debt	7.3	7.3	14.7	14.7
Change in fair value of derivatives	(2.0)	4.6	5.8	3.5
Change in fair value of loan notes issued by variable interest entities	3.3	2.6	6.2	6.0
Realized and unrealized investment losses	28.8	3.3	43.3	7.6
Net realized and unrealized foreign exchange losses/(gains)	11.6	(10.7)	18.0	(10.8)
Other expenses	(1.8)	1.2	0.8	1.9
Total expenses	617.2	563.1	1,186.4	1,073.4
Income from operations before income tax	51.2	137.0	184.3	261.2
Income tax expense	(2.2)	(6.2)	(7.3)	(10.0)
Net income	49.0	130.8	177.0	251.2
Amount attributable to non-controlling interest	(0.5)	0.0	(0.5)	(0.1)
Net income attributable to Aspen Insurance Holdings Limited’s ordinary shareholders	48.5	130.8	176.5	251.1
Available for sale investments:
Reclassification adjustment for net realized losses/(gains) on investments included in net income	0.6	(1.9)	(31.7)	(2.3)
Change in net unrealized (losses)/gains on available for sale securities held	(78.2)	35.0	(45.8)	58.0
Net change from current period hedged transactions	5.1	0.0	2.7	0.0
Change in foreign currency translation adjustment	(15.7)	22.8	(43.4)	18.0
Other comprehensive (loss)/income, gross of tax	(88.2)	55.9	(118.2)	73.7
Tax thereon:
Reclassification adjustment for net realized (losses)/gains on investments included in net income	0.0	(0.1)	0.4	0.1
Change in foreign currency translation adjustment	(0.5)	0.0	1.1	0.0
Change in net unrealized gains/(losses) on available for sale securities held	4.2	(3.5)	0.9	(6.0)
Total tax on other comprehensive income/(loss)	3.7	(3.6)	2.4	(5.9)
Other comprehensive (loss)/income net of tax	(84.5)	52.3	(115.8)	67.8
Total comprehensive (loss)/income attributable to Aspen Insurance Holdings Limited’s ordinary shareholders	$ (36.0)	$ 183.1	$ 60.7	$ 318.9
Weighted average number of ordinary share and share equivalents
Basic (in shares)	61,408,633	65,447,128	61,775,646	65,368,675
Diluted (in shares)	62,896,907	66,700,368	63,164,863	66,646,319
Basic earnings per ordinary share adjusted for preference share dividends (in usd per share)	$ 0.64	$ 1.85	$ 2.55	$ 3.55
Diluted earnings per ordinary share adjusted for preference share dividends (in usd per share)	$ 0.62	$ 1.82	$ 2.50	$ 3.48

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Investments

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Investments

Investments

Income Statement

Investment Income. The following table summarizes investment income for the three and six months ended June 30, 2015 and 2014:

	For the Three Months Ended						For the Six Months Ended
	June 30, 2015			June 30, 2014			June 30, 2015			June 30, 2014
	($ in millions)						($ in millions)
Fixed income securities — Available for sale	$	35.5		$	37.3		$	70.7		$	75.8
Fixed income securities — Trading	6.9			6.6			13.9			13.2
Short-term investments — Available for sale	0.2			0.3			0.6			0.6
Fixed term deposits (included in cash and cash equivalents)	0.9			1.1			2.0			1.9
Equity securities — Available for sale	0.1			1.0			0.1			2.5
Equity securities — Trading	5.7			3.1			11.9			7.0
Catastrophe bonds — Trading	0.5			0.2			0.9			0.4
Total	$	49.8		$	49.6		$	100.1		$	101.4
Investment expenses	(3.1		)	(3.5		)	(6.0		)	(5.8		)
Net investment income	$	46.7		$	46.1		$	94.1		$	95.6

The following table summarizes the net realized and unrealized investment gains and losses recorded in the statement of operations and the change in unrealized gains and losses on investments recorded in other comprehensive income for the three and six months ended June 30, 2015 and 2014:

	For the Three Months Ended						For the Six Months Ended
	June 30, 2015			June 30, 2014			June 30, 2015			June 30, 2014
	($ in millions)						($ in millions)
Available for sale:
Fixed income securities — gross realized gains	$	1.1		$	2.0		$	7.3		$	6.4
Fixed income securities — gross realized (losses)	(0.6		)	(1.4		)	(1.1		)	(4.5		)
Equity securities — gross realized gains	—			4.2			31.9			5.5
Equity securities — gross realized (losses)	—			—			(3.0		)	—
Other-than-temporary impairments	—			(0.7		)	—			(0.7		)
Trading:
Fixed income securities — gross realized gains	1.3			2.8			3.3			4.7
Fixed income securities — gross realized (losses)	(0.4		)	(1.0		)	(2.6		)	(2.2		)
Equity securities — gross realized gains	11.9			0.7			28.4			1.7
Equity securities — gross realized (losses)	(4.3		)	(0.2		)	(13.1		)	(0.2		)
Catastrophe bonds	(0.8		)	(0.1		)	(0.8		)	—
Net change in gross unrealized gains	(23.5		)	25.0			(22.7		)	34.2
Total net realized and unrealized investment gains recorded in the statement of operations	$	(15.3	)	$	31.3		$	27.6		$	44.9
Change in available for sale net unrealized gains (losses):
Fixed income securities	(77.4		)	31.4			(50.1		)	53.5
Short-term investments	(0.1		)	—			—			—
Equity securities	(0.1		)	1.7			(27.4		)	2.2
Total change in pre-tax available for sale unrealized gains	(77.6		)	33.1			(77.5		)	55.7
Change in taxes	4.2			(3.6		)	1.3			(5.9		)
Total change in net unrealized (losses) gains, net of taxes, recorded in other comprehensive income	$	(73.4	)	$	29.5		$	(76.2	)	$	49.8

Other-than-temporary Impairments. A security is potentially impaired when its fair value is below its amortized cost. The Company reviews its available for sale fixed income and equity portfolios on an individual security basis for potential other-than-temporary impairment (“OTTI”) each quarter based on criteria including issuer-specific circumstances, credit ratings actions and general macro-economic conditions. For a more detailed description of OTTI, please refer to Note 2(c) of the “Notes to the Audited Consolidated Financial Statements” in the Company’s 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission. There was no OTTI charge recognized for the three and six months ended June 30, 2015 (2014 — $0.7 million and $0.7 million, respectively).

Balance Sheet

Fixed Income Securities, Short-Term Investments and Equities — Available For Sale. The following tables present the cost or amortized cost, gross unrealized gains and losses and estimated fair market value of available for sale investments in fixed income securities, short-term investments and equity securities as at June 30, 2015 and December 31, 2014:

	As at June 30, 2015
	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	($ in millions)
U.S. government	$	1,056.2	$	19.5	$	(1.1	)	$	1,074.6
U.S. agency	175.8		6.3		(0.1		)	182.0
Municipal	27.8		1.7		—			29.5
Corporate	2,373.3		59.6		(12.1		)	2,420.8
Non-U.S. government-backed corporate	77.5		0.9		(0.1		)	78.3
Foreign government	650.3		12.5		(1.1		)	661.7
Asset-backed	136.6		2.1		—			138.7
Non-agency commercial mortgage-backed	33.4		2.2		—			35.6
Agency mortgage-backed	981.9		32.1		(5.5		)	1,008.5
Total fixed income securities — Available for sale	5,512.8		136.9		(20.0		)	5,629.7
Total short-term investments — Available for sale	184.0		0.1		—			184.1
Total	$	5,696.8	$	137.0	$	(20.0	)	$	5,813.8

	As at December 31, 2014
	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	($ in millions)
U.S. government	$	1,074.2	$	21.5	$	(1.3	)	$	1,094.4
U.S. agency	190.0		7.5		(0.1		)	197.4
Municipal	29.1		2.4		—			31.5
Corporate	2,244.7		79.9		(5.2		)	2,319.4
Non-U.S. government-backed corporate	76.8		1.2		—			78.0
Foreign government	648.6		17.3		(0.2		)	665.7
Asset-backed	141.3		2.4		(0.2		)	143.5
Non-agency commercial mortgage-backed	41.5		3.3		—			44.8
Agency mortgage-backed	1,016.7		40.8		(2.2		)	1,055.3
Total fixed income securities — Available for sale	5,462.9		176.3		(9.2		)	5,630.0
Total short-term investments — Available for sale	258.2		0.1		—			258.3
Total equity securities — Available for sale	82.6		27.3		—			109.9
Total	$	5,803.7	$	203.7	$	(9.2	)	$	5,998.2

Fixed Income Securities, Short-Term Investments, Equities and Catastrophe Bonds — Trading. The following tables present the cost or amortized cost, gross unrealized gains and losses, and estimated fair market value of trading investments in fixed income securities, short-term investments, equity securities and catastrophe bonds as at June 30, 2015 and December 31, 2014:

	As at June 30, 2015
	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	($ in millions)
U.S. government	$	3.4	$	—	$	—		$	3.4
Municipal	0.5		—		—			0.5
Corporate	535.9		8.7		(4.5		)	540.1
Foreign government	131.4		3.3		(0.9		)	133.8
Asset-backed	19.6		0.1		—			19.7
Bank loans	80.6		0.2		(0.6		)	80.2
Total fixed income securities — Trading	771.4		12.3		(6.0		)	777.7
Total short-term investments — Trading	1.1		—		—			1.1
Total equity securities — Trading	717.5		48.6		(36.8		)	729.3
Total catastrophe bonds — Trading	32.6		—		(0.3		)	32.3
Total	$	1,522.6	$	60.9	$	(43.1	)	$	1,540.4

	As at December 31, 2014
	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	($ in millions)
U.S. agency	$	0.2	$	—	$	—		$	0.2
Municipal	1.1		—		—			1.1
Corporate	520.9		11.7		(2.8		)	529.8
Foreign government	137.3		4.3		(1.5		)	140.1
Asset-backed	14.6		0.1		—			14.7
Bank loans	86.8		—		(1.7		)	85.1
Total fixed income securities — Trading	760.9		16.1		(6.0		)	771.0
Total short-term investments — Trading	0.2		—		—			0.2
Total equity securities — Trading	585.2		55.5		(24.7		)	616.0
Total catastrophe bonds — Trading	34.4		0.4		—			34.8
Total	$	1,380.7	$	72.0	$	(30.7	)	$	1,422.0

The Company classifies these financial instruments as held for trading as this most closely reflects the facts and circumstances of the investments held.

Catastrophe Bonds. The Company has invested in catastrophe bonds with a total value of $32.3 million as of June 30, 2015.  The bonds receive quarterly interest payments based on variable interest rates with scheduled maturities ranging from 2016 to 2020.  The redemption value of the bonds will adjust based on the occurrence of a covered event, such as windstorms and earthquakes which occur in the United States, Canada, the North Atlantic, Japan or Australia.

Other Investments. In January 2015, the Company established, along with seven other insurance companies, a micro-insurance venture consortium and micro-insurance incubator (“MVI”), domiciled in Bermuda. The MVI is a social impact organization that will provide micro-insurance products to assist global emerging consumers. The Company's initial investment in the MVI was $0.8 million.

On October 2, 2012, the Company established a subsidiary, Aspen Recoveries Limited, to take ownership of a 58.5% shareholding in Chaspark Maritime Holdings Ltd., a Singaporean registered company (“Chaspark”), with the remaining shareholding owned by other insurers. The shareholding in Chaspark was received as a settlement for subrogation rights associated with a contract frustration claim settlement. The Company has determined that Chaspark has the characteristics of a variable interest entity as addressed by the guidance in ASC 810-10, Consolidation. However, having considered the provisions of ASC 810-10, the Company’s investment in Chaspark does not permit the Company to direct the activities which most significantly impact Chaspark’s economic performance and the Company is not acting as principal or agent for a related party group of investors. Under these circumstances, the Company is not required to consolidate Chaspark. The investment is therefore accounted for under the equity method and adjustments to the carrying value of this investment are made based on the Company’s share of capital including share of income and expenses, which is provided in the quarterly management accounts. The adjusted carrying value approximates fair value.

The tables below show the Company’s investments in the MVI and Chaspark for the three and six months ended June 30, 2015:

	For the Three Months Ended June 30, 2015
	MVI		Chaspark		Total
	($ in millions)
Opening and closing undistributed value of investment	$	0.8	$	8.7	$	9.5

	For the Six Months Ended June 30, 2015
	MVI		Chaspark		Total
	($ in millions)
Opening undistributed value of investment as at January 1, 2015	$	—	$	8.7	$	8.7
Initial investment	0.8		—		$	0.8
Closing value of investment as at June 30, 2015	$	0.8	$	8.7	$	9.5

Fixed Income Securities. The scheduled maturity distribution of available for sale fixed income securities as at June 30, 2015 and December 31, 2014 is set forth below. Actual maturities may differ from contractual maturities because issuers of securities may have the right to call or prepay obligations with or without call or prepayment penalties.

	As at June 30, 2015
	Amortized Cost or Cost		Fair Market Value		Average S&P Ratings by Maturity
	($ in millions)
Due one year or less	$	632.9	$	638.4	AA
Due after one year through five years	2,575.0		2,636.3		AA-
Due after five years through ten years	1,064.3		1,077.3		A+
Due after ten years	88.7		94.9		A+
Subtotal	4,360.9		4,446.9
Non-agency commercial mortgage-backed	33.4		35.6		AA+
Agency mortgage-backed	981.9		1,008.5		AA+
Asset-backed	136.6		138.7		AAA
Total fixed income securities — Available for sale	$	5,512.8	$	5,629.7

	As at December 31, 2014
	Amortized Cost or Cost		Fair Market Value		Average S&P Ratings by Maturity
	($ in millions)
Due one year or less	$	590.2	$	594.7	AA
Due after one year through five years	2,552.0		2,620.8		AA-
Due after five years through ten years	1,023.5		1,059.9		A+
Due after ten years	97.7		111.0		A+
Subtotal	4,263.4		4,386.4
Non-agency commercial mortgage-backed	41.5		44.8		AA+
Agency mortgage-backed	1,016.7		1,055.3		AA+
Asset-backed	141.3		143.5		AAA
Total fixed income securities — Available for sale	$	5,462.9	$	5,630.0

Guaranteed Investments. As at June 30, 2015, the Company held $2.4 million (December 31, 2014 — $2.5 million) in investments which are guaranteed by mono-line insurers, excluding those with explicit government guarantees, and the Company’s holding was limited to two municipal securities, rated A3 and Caa3 (December 31, 2014 — two municipal securities, rated A3 and Caa3). The standalone rating (rating without guarantee) is determined as the senior unsecured debt rating of the issuer. Where the credit ratings were split between the two main rating agencies, Standard & Poor’s Financial Services LLC (“S&P”) and Moody’s Investors Service, Inc. (“Moody’s”), the lowest rating was used. The Company’s exposure to other third-party guaranteed debt is primarily to investments backed by non-U.S. government guaranteed issuers.

Gross Unrealized Loss. The following tables summarize as at June 30, 2015 and December 31, 2014 by type of security, the aggregate fair value and gross unrealized loss by length of time the security has been in an unrealized loss position for the Company’s available for sale portfolio:

	As at June 30, 2015
	0-12 months					Over 12 months					Total
	Fair Market Value		Gross Unrealized Loss			Fair Market Value		Gross Unrealized Loss			Fair Market Value		Gross Unrealized Loss			Number of Securities
	($ in millions)
U.S. government	$	125.8	$	(1.0	)	$	40.6	$	(0.1	)	$	166.4	$	(1.1	)	28
U.S. agency	3.9		(0.1		)	5.0		—			8.9		(0.1		)	4
Municipal	1.9		—			—		—			1.9		—			3
Corporate	829.2		(10.6		)	75.0		(1.5		)	904.2		(12.1		)	332
Non-U.S. government-backed corporate	10.3		(0.1		)	—		—			10.3		(0.1		)	5
Foreign government	150.9		(1.0		)	3.7		(0.1		)	154.6		(1.1		)	23
Asset-backed	29.6		—			12.1		—			41.7		—			30
Agency mortgage-backed	235.0		(3.5		)	67.9		(2.0		)	302.9		(5.5		)	78
Total fixed income securities — Available for sale	1,386.6		(16.3		)	204.3		(3.7		)	1,590.9		(20.0		)	503
Total short-term investments — Available for sale	54.6		—			—		—			54.6		—			10
Total	$	1,441.2	$	(16.3	)	$	204.3	$	(3.7	)	$	1,645.5	$	(20.0	)	513

	As at December 31, 2014
	0-12 months					Over 12 months					Total
	Fair Market Value		Gross Unrealized Loss			Fair Market Value		Gross Unrealized Loss			Fair Market Value		Gross Unrealized Loss			Number of Securities
	($ in millions)
U.S. government	$	166.1	$	(0.5	)	$	79.4	$	(0.8	)	$	245.5	$	(1.3	)	39
U.S. agency	25.1		—			4.9		(0.1		)	30.0		(0.1		)	7
Municipal	—		—			—		—			—		—			0
Corporate	459.4		(2.1		)	171.3		(3.1		)	630.7		(5.2		)	274
Non-U.S. government-backed corporate	0.7		—			—		—			0.7		—			1
Foreign government	30.4		—			44.2		(0.2		)	74.6		(0.2		)	16
Asset-backed	43.7		(0.1		)	11.7		(0.1		)	55.4		(0.2		)	43
Agency mortgage-backed	64.7		(0.3		)	111.7		(1.9		)	176.4		(2.2		)	48
Total fixed income securities — Available for sale	790.1		(3.0		)	423.2		(6.2		)	1,213.3		(9.2		)	428
Total short-term investments — Available for sale	4.6		—			—		—			4.6		—			3
Total	$	794.7	$	(3.0	)	$	423.2	$	(6.2	)	$	1,217.9	$	(9.2	)	431

Investment Purchases and Sales. The following table summarizes investment purchases, sales and maturities for the three and six months ended June 30, 2015 and 2014:

	For the Three Months Ended						For the Six Months Ended
	June 30, 2015			June 30, 2014			June 30, 2015			June 30, 2014
	($ in millions)						($ in millions)
(Purchases) of fixed income securities — Available for sale	$	(455.6	)	$	(380.9	)	$	(939.3	)	$	(918.1	)
(Purchases) of fixed income securities — Trading	(122.1		)	(206.8		)	(275.5		)	(398.9		)
(Purchases) of equity securities — Trading	(82.2		)	(67.1		)	(268.9		)	(118.9		)
Proceeds from sales and maturities of fixed income securities — Available for sale	320.8			417.1			861.5			1,015.9
Proceeds from sales and maturities of fixed income securities — Trading	130.7			190.9			264.5			372.2
Proceeds from sales of equity securities — Available for sale	—			11.6			108.6			15.6
Proceeds from sales of equity securities — Trading	67.4			12.9			151.1			18.2
Net change in (payable)/receivable for securities (purchased)/sold	(10.1		)	6.2			5.8			19.8
(Purchases) of short-term investments — Available for sale	(47.2		)	(137.6		)	(109.3		)	(268.9		)
Sale of short-term investments — Available for sale	49.0			23.5			172.4			92.9
(Purchases) of short-term investments — Trading	(2.9		)	(70.2		)	(15.7		)	(80.2		)
Sale of short-term investments — Trading	2.5			56.2			14.8			66.2
Net proceeds/(purchases) of catastrophe bonds — Trading	—			(12.2		)	1.8			(24.3		)
Proceeds from other investments	—			—			—			37.3
Net (purchases) for the period	$	(149.7	)	$	(156.4	)	$	(28.2	)	$	(171.2	)

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Segment Reporting

6 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

Segment Reporting

Segment Reporting

The Company has two reporting business segments: Insurance and Reinsurance. In addition to the way the Company manages its business, the Company has considered similarities in economic characteristics, products, customers, distribution, the regulatory environment of the Company’s operating segments and quantitative thresholds to determine the Company’s reportable segments. Segment profit or loss for each of the Company’s operating segments is measured by underwriting profit or loss. Underwriting profit is the excess of net earned premiums over the sum of losses and loss expenses, amortization of deferred policy acquisition costs and general and administrative expenses. Underwriting profit or loss provides a basis for management to evaluate the segment’s underwriting performance.

Reinsurance Segment. The reinsurance segment consists of property catastrophe reinsurance, other property reinsurance (risk excess, pro rata and facultative), casualty reinsurance (U.S. treaty, international treaty and global facultative) and specialty reinsurance (credit and surety, agriculture, marine, aviation, engineering and other specialty). ACM forms part of property catastrophe reinsurance line of business as it currently focuses on property catastrophe business through the use of alternative capital. For a more detailed description of this segment, see Part I, Item 1, “Business — Business Segments — Reinsurance” in the Company’s 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission.

Insurance Segment. The insurance segment consists of property and casualty insurance, marine, aviation and energy insurance and financial and professional lines insurance. For a more detailed description of this segment, see Part I, Item 1 “Business — Business Segments — Insurance” in the Company’s 2014 Annual Report on Form 10-K filed with the United States Securities and Exchange Commission.

Non-underwriting Disclosures. The Company has provided additional disclosures for corporate and other (non-underwriting) income and expenses. Corporate and other income and expenses include net investment income, net realized and unrealized investment gains or losses, expenses associated with managing the group, certain strategic and non-recurring costs, changes in fair value of derivatives and changes in fair value of the loan notes issued by variable interest entities, interest expenses, net realized and unrealized foreign exchange gains or losses and income taxes, which are not allocated to the underwriting segments. Corporate expenses are not allocated to the Company’s operating segments as they typically do not fluctuate with the levels of premiums written and are not directly related to the Company’s segment operations. The Company does not allocate its assets by segment as it evaluates underwriting results of each segment separately from the results of the Company’s investment portfolio.

The following tables provide a summary of gross and net written and earned premiums, underwriting results, ratios and reserves for each of the Company’s business segments for the three months ended June 30, 2015 and 2014:

	Three Months Ended June 30, 2015
	Reinsurance			Insurance			Total
	($ in millions)
Underwriting Revenues
Gross written premiums	$	260.7		$	462.1		$	722.8
Net written premiums	238.2			406.2			644.4
Gross earned premiums	287.2			423.2			710.4
Net earned premiums	268.3			341.1			609.4
Underwriting Expenses
Losses and loss adjustment expenses	116.3			244.2			360.5
Amortization of deferred policy acquisition costs	50.4			63.7			114.1
General and administrative expenses	35.4			45.2			80.6
Underwriting income/(loss)	$	66.2		$	(12.0	)	54.2
Corporate expenses							(14.8		)
Net investment income							46.7
Realized and unrealized investment gains							13.5
Realized and unrealized investment losses							(28.8		)
Change in fair value of loan notes issued by variable interest entities							(3.3		)
Change in fair value of derivatives							2.0
Interest expense on long term debt							(7.3		)
Net realized and unrealized foreign exchange (losses)							(11.6		)
Other income							(1.2		)
Other expenses							1.8
Income before tax							$	51.2
Net reserves for loss and loss adjustment expenses	$	2,411.6		$	2,067.0		$	4,478.6
Ratios
Loss ratio	43.3		%	71.6		%	59.2		%
Policy acquisition expense ratio	18.8			18.7			18.7
General and administrative expense ratio	13.2			13.3			15.7			(1)
Expense ratio	32.0			32.0			34.4
Combined ratio	75.3		%	103.6		%	93.6		%

⁽¹⁾  The general and administrative expense ratio in the total column includes corporate expenses.

	Three Months Ended June 30, 2014
	Reinsurance			Insurance			Total
	( $ in millions)
Underwriting Revenues
Gross written premiums	$	298.4		$	480.9		$	779.3
Net written premiums	286.9			399.5			686.4
Gross earned premiums	289.7			404.5			694.2
Net earned premiums	278.8			337.4			616.2
Underwriting Expenses
Losses and loss adjustment expenses	125.0			212.1			337.1
Amortization of deferred policy acquisition costs	49.8			59.1			108.9
General and administrative expenses	35.8			51.1			86.9
Underwriting income	$	68.2		$	15.1		83.3
Corporate expenses							(21.9		)
Net investment income							46.1
Realized and unrealized investment gains							34.6
Realized and unrealized investment losses							(3.3		)
Change in fair value of loan notes issued by variable interest entities							(2.6		)
Change in fair value of derivatives							(4.6		)
Interest expense on long term debt							(7.3		)
Net realized and unrealized foreign exchange gains							10.7
Other income							3.2
Other expenses							(1.2		)
Income before tax							$	137.0
Net reserves for loss and loss adjustment expenses	$	2,584.8		$	1,851.0		$	4,435.8
Ratios
Loss ratio	44.8		%	62.9		%	54.7		%
Policy acquisition expense ratio	17.9			17.5			17.7
General and administrative expense ratio	12.8			15.1			17.7			(1)
Expense ratio	30.7			32.6			35.4
Combined ratio	75.5		%	95.5		%	90.1		%

⁽¹⁾  The general and administrative expense ratio in the total column includes corporate expenses.

The following tables provide a summary of gross and net written and earned premiums, underwriting results, ratios and reserves for each of the Company’s business segments for the six months ended June 30, 2015 and 2014:

	Six Months Ended June 30, 2015
	Reinsurance			Insurance			Total
	($ in millions)
Underwriting Revenues
Gross written premiums	$	745.5		$	896.5		$	1,642.0
Net written premiums	680.3			727.3			1,407.6
Gross earned premiums	553.0			838.3			1,391.3
Net earned premiums	517.7			685.3			1,203.0
Underwriting Expenses
Losses and loss adjustment expenses	221.8			444.8			666.6
Amortization of deferred policy acquisition costs	103.8			129.6			233.4
General and administrative expenses	67.8			100.5			168.3
Underwriting income	$	124.3		$	10.4		134.7
Corporate expenses							(29.3		)
Net investment income							94.1
Realized and unrealized investment gains							70.9
Realized and unrealized investment losses							(43.3		)
Change in fair value of loan notes issued by variable interest entities							(6.2		)
Change in fair value of derivatives							(5.8		)
Interest expense on long term debt							(14.7		)
Net realized and unrealized foreign exchange (losses)							(18.0		)
Other income							2.7
Other expenses							(0.8		)
Income before tax							$	184.3
Net reserves for loss and loss adjustment expenses	$	2,411.6		$	2,067.0		$	4,478.6
Ratios
Loss ratio	42.8		%	64.9		%	55.4		%
Policy acquisition expense ratio	20.1			18.9			19.4
General and administrative expense ratio	13.1			14.7			16.4			(1)
Expense ratio	33.2			33.6			35.8
Combined ratio	76.0		%	98.5		%	91.2		%

⁽¹⁾  The general and administrative expense ratio in the total column includes corporate expenses.

	Six Months Ended June 30, 2014
	Reinsurance			Insurance			Total
	( $ in millions)
Underwriting Revenues
Gross written premiums	$	770.6		$	864.2		$	1,634.8
Net written premiums	729.5			654.4			1,383.9
Gross earned premiums	568.2			778.1			1,346.3
Net earned premiums	545.5			637.2			1,182.7
Underwriting Expenses
Losses and loss adjustment expenses	235.4			389.8			625.2
Amortization of deferred policy acquisition costs	100.2			120.7			220.9
General and administrative expenses	68.6			97.0			165.6
Underwriting income	$	141.3		$	29.7		171.0
Corporate expenses							(38.8		)
Net investment income							95.6
Realized and unrealized investment gains							52.5
Realized and unrealized investment losses							(7.6		)
Change in fair value of loan notes issued by variable interest entities							(6.0		)
Change in fair value of derivatives							(3.5		)
Interest expense on long term debt							(14.7		)
Net realized and unrealized foreign exchange gains							10.8
Other income							3.8
Other expenses							(1.9		)
Income before tax							$	261.2
Net reserves for loss and loss adjustment expenses	$	2,584.8		$	1,851.0		$	4,435.8
Ratios
Loss ratio	43.2		%	61.2		%	52.9		%
Policy acquisition expense ratio	18.4			18.9			18.7
General and administrative expense ratio	12.6			15.2			17.3			(1)
Expense ratio	31.0			34.1			36.0
Combined ratio	74.2		%	95.3		%	88.9		%

⁽¹⁾  The general and administrative expense ratio in the total column includes corporate expenses.

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Basis of Preparation (Policies)

6 Months Ended

Jun. 30, 2015

Accounting Policies [Abstract]

Accounting Pronouncements Not Yet Adopted

Accounting Pronouncements Not Yet Adopted

On April 15, 2015, the Financial Accounting Standards Board (“FASB”) issued ASU 2015-04, “Compensation - Retirement Benefits (Topic 715)” which includes amendments that change the analysis that an entity must perform to determine whether it should consolidate certain types of legal entities. ASU 2015-02 is effective for fiscal years beginning after December 15, 2015. The Company does not expect this ASU to impact its consolidated financial statements as the Company does not possess a defined benefit pension plan.

On April 15, 2015, the FASB issued ASU 2015-05, “Intangibles - Goodwill and Other - Internal Use Software (Topic 350-40)” which will help entities evaluate the accounting for fees paid by a customer in a cloud computing arrangement. ASU 2015-05 is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2015. The Company does not expect this ASU to have a material impact on its consolidated financial statements.

On April 17, 2015, the FASB issued ASU 2015-03, “Interest - Imputation of Interest (Subtopic 835-30)” which requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. The ASU simplifies the presentation of debt issuance costs as part of FASB’s initiative to reduce complexity in accounting standards. ASU 2015-03 is effective for fiscal years beginning after December 15, 2015. The Company does not expect this ASU to have a material impact on its consolidated financial statements.

On April 30, 2015, the FASB issued ASU 2015-07, “Fair Value Measurement (Topic 820) Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent)” which removes the requirement to categorize within the fair value hierarchy all investments for which fair value is measured using the net asset value per share practical expedient. ASU 2015-07 is effective for annual periods beginning after December 15, 2015. The Company does not expect this ASU to have a material impact on its consolidated financial statements.

On May 8, 2015, the FASB issued ASU 2015-08, “Business Combinations (Topic 805) Pushdown Accounting” which conforms the FASB’s guidance on pushdown accounting with the SEC’s guidance. ASU 2015-08 is effective for annual periods beginning after December 15, 2015. The Company does not expect this ASU to have a material impact on its consolidated financial statements.

On May 21, 2015, the FASB issued ASU 2015-09, “Financial Services - Insurance (Topic 944) Disclosures About Short-Duration Contracts” which requires insurance entities to disclose additional information about the liability for unpaid claims and claim adjustment expenses, disclose information about significant changes in methodologies and assumptions used to calculate the liability for unpaid claims and claim adjustment expenses and disclose a rollforward of the liability for unpaid claims and claims adjustment expenses. ASU 2015-09 is effective for annual periods beginning after December 15, 2015 and interim periods within annual periods beginning after December 15, 2016. The Company does not expect this ASU to have a material impact on its consolidated financial results but it will have an impact on the disclosures in the Company’s Quarterly reports on Form 10-Q and Annual report on Form 10-K.

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Capital Structure

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Capital Structure

Capital Structure

The following table provides a summary of the Company’s authorized and issued share capital as at June 30, 2015 and December 31, 2014:

	As at June 30, 2015		As at December 31, 2014
	Number	$ in Thousands	Number	$ in Thousands
Authorized share capital:
Ordinary Shares 0.15144558¢ per share	969,629,030	1,469	969,629,030	1,469
Non-Voting Shares 0.15144558¢ per share	6,787,880	10	6,787,880	10
Preference Shares 0.15144558¢ per share	100,000,000	152	100,000,000	152
Total authorized share capital		1,631		1,631
Issued share capital:
Issued ordinary shares of 0.15144558¢ per share	60,777,875	92	62,017,368	94
Issued 7.401% preference shares of 0.15144558¢ each with a liquidation preference of $25 per share	5,327,500	8	5,327,500	8
Issued 7.250% preference shares of 0.15144558¢ each with a liquidation preference of $25 per share	6,400,000	10	6,400,000	10
Issued 5.95% preference shares of 0.15144558¢ each with a liquidation preference of $25 per share	11,000,000	17	11,000,000	17
Total issued share capital		127		129

Additional paid-in capital as at June 30, 2015 was $1,061.7 million (December 31, 2014 — $1,134.3 million). Additional paid-in capital includes the aggregate liquidation preferences of the Company’s preference shares of $568.2 million (December 31, 2014 — $568.2 million) less issue costs of $12.4 million (December 31, 2014 — $12.4 million).

Ordinary Shares. The following table summarizes transactions in the Company’s ordinary shares during the six months ended June 30, 2015:

	Number of Ordinary Shares
Ordinary shares in issue at December 31, 2014	62,017,368
Ordinary share transactions in the six months ended June 30, 2015
Ordinary shares issued to employees under the 2003 and 2013 share incentive plans and/or 2008 share purchase plan	544,034
Ordinary shares issued to non-employee directors	6,806
Ordinary shares repurchased	(1,790,333	)
Ordinary shares in issue at June 30, 2015	60,777,875

Ordinary Share Repurchases. On February 5, 2015, the Company and the Board of Directors agreed a new share repurchase authorization program of $500.0 million. The total share repurchase authorization, which was effective immediately through February 6, 2017, permits the Company to effect the repurchases from time to time through a combination of transactions, including open market repurchases, privately negotiated transactions and accelerated share repurchase transactions.

Under open market repurchases under a Rule 10b5-1 plan, the Company acquired and cancelled for the three and six months ended June 30, 2015, 1,003,195 and 1,790,333 ordinary shares, respectively. The total consideration paid for the three and six months ended June 30, 2015 was $47.2 million and $83.7 million, respectively, with an average price per ordinary share for the three and six months ended June 30, 2015 of $47.06 and $46.74, respectively. Under open market repurchases, the Company acquired and cancelled Nil and 770,505 ordinary shares, respectively, for the three and six months ended June 30, 2014. The total consideration paid for the three and six months ended June 30, 2014 was $Nil and $30.9 million, respectively and the average price per ordinary share was $Nil and $40.08, respectively.

Rights Agreement. On April 17, 2014, the Board of Directors resolved to issue one preferred share purchase right (a “Right”) for each outstanding ordinary share, and adopted a shareholder rights plan, as set forth in the Rights Agreement dated as of April 17, 2014. Each Right would have allowed its holder to purchase from the Company one one-thousandth of a share of Series A Junior Participating Preference Shares for $160, once the Rights became exercisable. The Rights could not be exercisable until 10 business days after the public announcement that a person or group acquired the beneficial ownership of 10% or more of the outstanding ordinary shares of the Company (or 15% in the case of passive institutional investors). The Rights could have been redeemed at any time at the discretion of the Board of Directors. As of June 30, 2015, no Rights were exercisable or exercised. The Rights Agreement expired on April 16, 2015.

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Reinsurance

6 Months Ended

Jun. 30, 2015

Insurance [Abstract]

Reinsurance

Reinsurance

The Company purchases retrocession and reinsurance to limit and diversify the Company’s risk exposure and increase its own insurance and reinsurance underwriting capacity. These agreements provide for recovery of a portion of losses and loss adjustment expenses from reinsurers. As is the case with most reinsurance contracts, the Company remains liable to the extent that reinsurers do not meet their obligations under these agreements, and therefore, in line with its risk management objectives, the Company evaluates the financial condition of its reinsurers and monitors concentrations of credit risk. The largest concentrations of reinsurance recoverables as at June 30, 2015 were 21.5% (December 31, 2014  — 18.6%) with Munich Re rated AA- by S&P, 20.0% (December 31, 2014 — 27.3%) with Lloyd’s syndicates rated A+ by S&P and 8.9% (December 31, 2014  — 8.4%) with Arch Re which is rated A+ by S&P.

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Deferred Policy Acquisition Costs - Reconciliation of Beginning and Ending Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance at the beginning of the period	$ 333.8	$ 289.6	$ 299.0	$ 262.2
Acquisition costs deferred	129.3	125.7	283.4	265.1
Amortization of deferred policy acquisition costs	(114.1)	(108.9)	(233.4)	(220.9)
Balance at the end of the period	$ 349.0	$ 306.4	$ 349.0	$ 306.4

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Variable Interest Entities

6 Months Ended

Jun. 30, 2015

Business Combinations [Abstract]

Variable Interest Entities

Variable Interest Entities

As at June 30, 2015, the Company had two investments in two variable interest entities (“VIE”), Chaspark and Silverton.

Chaspark. On October 2, 2012, the Company established a subsidiary, Aspen Recoveries Limited, to take ownership of a 58.5% shareholding in Chaspark, with the remaining shareholding owned by other insurers. The shareholding in Chaspark was received as a settlement for subrogation rights associated with a contract frustration claim settlement. The Company has determined that Chaspark has the characteristics of a VIE as addressed by the guidance in ASC 810, Consolidation. As discussed further in Note 6 of these unaudited condensed consolidated financial statements, the investment in Chaspark is accounted for under the equity method. In the three and six months ended June 30, 2015, there was no change in the value of the Company’s investment in Chaspark (June 30, 2014 — $Nil and $Nil). The adjusted carrying value approximates fair value.

Silverton. On September 10, 2013, the Company established Silverton, a Bermuda domiciled special purpose insurerformed to provide additional collateralized capacity to support Aspen Re’s business through retrocession agreements which are collateralized and funded by Silverton through the issuance of a series of loan notes. Silverton is a non-rated insurer and the risks are fully collateralized by way of funds held in trust for the benefit of Aspen Bermuda.

The proceeds of $65.0 million (of which $50.0 million was issued to third parties) from the issuance of Silverton’s Series 2014-1 Participating Notes on December 27, 2013 (“2014 Loan Notes”) were deposited into a collateral account to fund Silverton’s obligations under a retrocession property quota share agreement entered into with Aspen Bermuda effective January 1, 2014. The holders of the 2014 Loan Notes participate in any profit or loss generated by Silverton attributable to the operations of Silverton’s Series 2014-1 Segregated Account. Any existing value of the 2014 Loan Notes is being returned to the noteholders in installments after the expiration of the risk period of the retrocession agreement issued by Silverton for the related series with the final payment being contractually due on the September 16, 2016 maturity date. The fair value of the 2014 Loan Notes as at June 30, 2015 was $2.1 million (of which $1.6 million was due to external investors). During the first half of 2015, Silverton distributed $87.0 million (of which $67.0 million was distributed to external investors) to its noteholders. Of the remaining $1.6 million due to external investors, $1.6 million has been classified as a current liability in the Company’s consolidated financial statements. The total aggregate unpaid balance of the 2014 Loan Notes held by third parties and those held by Aspen Holdings is $2.1 million. The Company’s maximum loss exposure to the 2014 Loan Notes is $0.5 million which is the fair value of its holdings as at June 30, 2015.

The proceeds of $85.0 million (of which $70.0 million was issued to third parties) from the issuance of Silverton’s Series 2015-1 Participating Notes on December 23, 2014 (“2015 Loan Notes”) were deposited into a collateral account to fund Silverton’s obligations under a retrocession property quota share agreement entered into with Aspen Bermuda effective January 1, 2015. The holders of the 2015 Loan Notes participate in any profit or loss generated by Silverton attributable to the operations of Silverton’s Series 2015-1 Segregated Account. Any existing value of the 2015 Loan Notes will be returned to the noteholders after the expiration of the risk period of the retrocession agreement issued by Silverton for the related series with the final payment being contractually due on the September 18, 2017 maturity date. The fair value of the 2015 Loan Notes as at June 30, 2015 was $92.6 million (of which $76.2 million was held by external investors). The $76.2 million of the 2015 Loan Notes held by external investors is classified as long-term debt in the Company’s consolidated financial statements. The total aggregate unpaid balance of the 2015 Loan Notes held by third parties and those held by Aspen Holdings is $92.6 million. The Company’s maximum loss exposure to the 2015 Loan Notes is $16.3 million which is the fair value of its holdings as at June 30, 2015.

The Company has determined that Silverton has the characteristics of a VIE that are addressed by the guidance in ASC 810, Consolidation. The Company concluded that it is the primary beneficiary and has consolidated the subsidiary upon its formation as it owns 100% of the voting shares, 100% of the issued share capital and has a significant financial interest and the power to control Silverton. The Company has no other obligation to provide financial support to Silverton. Neither the creditors nor beneficial interest holders of Silverton have recourse to the Company’s general credit.

In the event of either an extreme catastrophic property reinsurance event or severe credit-related event there is a risk that Aspen Bermuda would be unable to recover losses from Silverton. These two risks are mitigated as follows:

i. Silverton has collateralized the aggregate limit provided to Aspen Bermuda by way of a trust in favor of Aspen Bermuda as the beneficiary;

ii. the trustee is a large, well-established regulated entity; and

iii. all funds within the trust account are bound by investment guidelines restricting investments to one of the institutional class money market funds run by large international investment managers.

For further information regarding the loan notes attributable to the third-party investments in Silverton, refer to Note 8 of these unaudited condensed consolidated financial statements.

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Fair Value Measurements

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The Company’s estimates of fair value for financial assets and liabilities are based on the framework established in the fair value accounting guidance included in ASC 820, Fair Value Measurements and Disclosures. The framework prioritizes the inputs, which refer broadly to assumptions market participants would use in pricing an asset or liability, into three levels.

The Company considers prices for actively traded securities to be derived based on quoted prices in an active market for identical assets, which are Level 1 inputs in the fair value hierarchy. The majority of these securities are valued using prices supplied by index providers.

The Company considers prices for other securities that may not be as actively traded which are priced via pricing services, index providers, vendors and broker-dealers, or with reference to interest rates and yield curves, to be derived based on inputs that are observable for the asset, either directly or indirectly, which are Level 2 inputs in the fair value hierarchy. The majority of these securities are also valued using prices supplied by index providers.

The Company considers securities, other financial instruments and derivative insurance contracts subject to fair value measurement whose valuation is derived by internal valuation models to be based largely on unobservable inputs, which are Level 3 inputs in the fair value hierarchy.

The following tables present the level within the fair value hierarchy at which the Company’s financial assets and liabilities are measured on a recurring basis as at June 30, 2015 and December 31, 2014, respectively:

	As at June 30, 2015
	Level 1		Level 2			Level 3			Total
	($ in millions)
Available for sale financial assets, at fair value
U.S. government	$	1,074.6	$	—		$	—		$	1,074.6
U.S. agency	—		182.0			—			182.0
Municipal	—		29.5			—			29.5
Corporate	—		2,420.8			—			2,420.8
Non-U.S. government-backed corporate	—		78.3			—			78.3
Foreign government	479.6		182.1			—			661.7
Asset-backed	—		138.7			—			138.7
Non-agency commercial mortgage-backed	—		35.6			—			35.6
Agency mortgage-backed	—		1,008.5			—			1,008.5
Total fixed income securities available for sale, at fair value	1,554.2		4,075.5			—			5,629.7
Short-term investments available for sale, at fair value	—		184.1			—			184.1
Held for trading financial assets, at fair value
U.S. government	3.4		—			—			3.4
Municipal	—		0.5			—			0.5
Corporate	—		540.1			—			540.1
Foreign government	41.3		92.5			—			133.8
Asset-backed	—		19.7			—			19.7
Bank loans	—		80.2			—			80.2
Total fixed income securities trading, at fair value	44.7		733.0			—			777.7
Short-term investments trading, at fair value	—		1.1			—			1.1
Equity investments trading, at fair value	729.3		—			—			729.3
Catastrophe bonds trading, at fair value	—		32.3			—			32.3
Other financial assets and liabilities, at fair value
Derivatives at fair value — foreign exchange contracts	—		4.1			—			4.1
Liabilities under derivative contracts — interest rate swaps	—		(1.0		)	—			(1.0		)
Liabilities under derivative contracts — foreign exchange contracts	—		(6.2		)	—			(6.2		)
Loan notes issued by variable interest entities, at fair value	—		—			(76.2		)	(76.2		)
Loan notes issued by variable interest entities, at fair value (classified as a current liability)	—		—			(1.6		)	(1.6		)
Total	$	2,328.2	$	5,022.9		$	(77.8	)	$	7,273.3

There were no maturities or transfers between Level 1, Level 2 and Level 3 during the three and six months ended June 30, 2015. The Company settled $2.2 million and $67.0 million Level 3 liabilities in respect to the loan notes issued by the VIEs for the three and six months ended June 30, 2015. As at at June 30, 2015, there were no assets classified as Level 3 and the Company's Level 3 liabilities consisted of the loan notes issued by the VIEs.

	As at December 31, 2014
	Level 1		Level 2			Level 3			Total
	($ in millions)
Available for sale financial assets, at fair value
U.S. government	$	1,094.4	$	—		$	—		$	1,094.4
U.S. agency	—		197.4			—			197.4
Municipal	—		31.5			—			31.5
Corporate	—		2,319.4			—			2,319.4
Non-U.S. government-backed corporate	—		78.0			—			78.0
Foreign government	456.5		209.2			—			665.7
Asset-backed	—		143.5			—			143.5
Non-agency commercial mortgage-backed	—		44.8			—			44.8
Agency mortgage-backed	—		1,055.3			—			1,055.3
Total fixed income securities available for sale, at fair value	1,550.9		4,079.1			—			5,630.0
Short-term investments available for sale, at fair value	229.3		29.0			—			258.3
Equity investments available for sale, at fair value	109.9		—			—			109.9
Held for trading financial assets, at fair value
U.S. government	—		—			—			—
U.S. agency	—		0.2			—			0.2
Municipal	—		1.1			—			1.1
Corporate	—		529.8			—			529.8
Foreign government	36.1		104.0			—			140.1
Asset-backed	—		14.7			—			14.7
Bank loans	—		85.1			—			85.1
Catastrophe bonds trading, at fair value	—		34.8			—			34.8
Total fixed income securities trading, at fair value	36.1		769.7			—			805.8
Short-term investments trading, at fair value	0.1		0.1			—			0.2
Equity investments trading, at fair value	616.0		—			—			616.0
Other financial assets and liabilities, at fair value
Derivatives at fair value – foreign exchange contracts	—		7.9			—			7.9
Derivatives at fair value – interest rate swaps	—		0.1			—			0.1
Liabilities under derivative contracts – foreign exchange contracts	—		(14.3		)	—			(14.3		)
Loan notes issued by variable interest entities, at fair value	—		—			(70.7		)	(70.7		)
Loan notes issued by variable interest entities, at fair value (classified as a current liability)	—		—			(67.9		)	(67.9		)
Total	$	2,542.3	$	4,871.6		$	(138.6	)	$	7,275.3

There were no maturities, settlements or transfers between Level 1, Level 2 and Level 3 during the twelve months ended December 31, 2014. There were no assets or liabilities that were classified as Level 3 as at December 31, 2014, except for the loan notes issued by the VIEs.

The following tables present a reconciliation of the beginning and ending balances for all assets and liabilities measured at fair value on a recurring basis using Level 3 inputs for the three and six months ended June 30, 2015 and 2014:

Reconciliation of Liabilities Using Level 3 Inputs	Three Months Ended June 30, 2015			Three Months Ended June 30, 2014
	($ in millions)
Balance at the beginning of the period (1)	$	76.7		$	53.4
Distributed to third party	(2.2		)	—
Total change in fair value included in the statement of operations	3.3			2.6
Balance at the end of the period (1)	$	77.8		$	56.0

Reconciliation of Liabilities Using Level 3 Inputs	Six Months Ended June 30, 2015			Six Months Ended June 30, 2014
	($ in millions)
Balance at the beginning of the period (1)	$	138.6		$	50.0
Distributed to third party	(67.0		)	—
Total change in fair value included in the statement of operations	6.2			6.0
Balance at the end of the period (1)	$	77.8		$	56.0

⁽¹⁾ The amount classified as other payables was $1.6 million and $67.9 million as at June 30, 2015 and December 31, 2014, respectively.

Valuation of Fixed Income Securities. The Company’s fixed income securities are classified as either available for sale or trading and carried at fair value. As at June 30, 2015 and December 31, 2014, the Company’s fixed income securities were valued by pricing services, index providers or broker-dealers using standard market conventions. The market conventions utilize market quotations, market transactions in comparable instruments and various relationships between instruments including, but not limited to, yield to maturity, dollar prices and spread prices in determining value.

Independent Pricing Services and Index Providers. The underlying methodology used to determine the fair value of securities in the Company’s available for sale and trading portfolios by the pricing services and index providers the Company uses is very similar. Pricing services will gather observable pricing inputs from multiple external sources, including buy and sell-side contacts and broker-dealers, in order to develop their internal prices. Index providers are those firms which provide prices for a range of securities within one or more asset classes, typically using their own in-house market makers (traders) as the primary pricing source for the indices, although ultimate valuations may also rely on other observable data inputs to derive a dollar price for all index-eligible securities. Index providers without in-house trading desks will function similarly to a pricing service in that they will gather their observable pricing inputs from multiple external sources. All prices for the Company’s securities attributed to index providers are for an individual security within the respective indices.

Pricing services and index providers provide pricing for less complex, liquid securities based on market quotations in active markets. Pricing services and index providers supply prices for a broad range of securities including those for actively traded securities, such as Treasury and other Government securities, in addition to those that trade less frequently or where valuation includes reference to credit spreads, pay down and pre-pay features and other observable inputs. These securities include Government Agency, Municipals, Corporate and Asset-Backed Securities.

For securities that may trade less frequently or do not trade on a listed exchange, these pricing services and index providers may use matrix pricing consisting of observable market inputs to estimate the fair value of a security. These observable market inputs include: reported trades, benchmark yields, broker-dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, reference data, and industry and economic factors. Additionally, pricing services and index providers may use a valuation model such as an option adjusted spread model commonly used for estimating fair values of mortgage-backed and asset-backed securities. Neither the Company, nor its index providers, derives dollar prices using an index as a pricing input for any individual security.

Broker-Dealers. The Company obtains quotes from broker-dealers who are active in the corresponding markets when prices are unavailable from independent pricing services or index providers. Generally, broker-dealers value securities through their trading desks based on observable market inputs. Their pricing methodologies include mapping securities based on trade data, bids or offers, observed spreads and performance of newly issued securities. They may also establish pricing through observing secondary trading of similar securities. Quotes from broker-dealers are non-binding.

The Company obtains prices for all of its fixed income investment securities via its third-party accounting service provider, and in the majority of cases receiving a number of quotes so as to obtain the most comprehensive information available to determine a security’s fair value. A single valuation is applied to each security based on the vendor hierarchy maintained by the Company’s third-party accounting service provider.

As at June 30, 2015, the Company obtained an average of 2.0 quotes per fixed income investment, consistent with 2.0 quotes as at December 31, 2014. Pricing sources used in pricing fixed income investments as at June 30, 2015 and December 31, 2014 were as follows:

	As at June 30, 2015		As at December 31, 2014
Index providers	83	%	84	%
Pricing services	12		11
Broker-dealers	5		5
Total	100	%	100	%

A summary of securities priced using pricing information from index providers as at June 30, 2015 and December 31, 2014 is provided below:

	As at June 30, 2015				As at December 31, 2014
	Fair Market Value Determined using Prices from Index Providers		% of Total Fair Value by Security Type		Fair Market Value Determined using Prices from Index Providers		% of Total Fair Value by Security Type
	($ in millions, except for percentages)
U.S. government	$	1,040.5	97	%	$	1,044.4	95	%
U.S. agency	171.7		94	%	186.9		95	%
Municipal	12.5		42	%	13.7		42	%
Corporate	2,828.1		96	%	2,731.1		96	%
Non-U.S. government-backed corporate	35.9		46	%	48.7		62	%
Foreign government	460.9		58	%	504.4		63	%
Asset-backed	138.9		88	%	140.5		89	%
Non-agency commercial mortgage-backed	35.6		100	%	44.8		100	%
Agency mortgage-backed	624.3		62	%	680.6		64	%
Total fixed income securities	$	5,348.4	83	%	$	5,395.1	84	%
Equities	729.3		100	%	725.9		100	%
Total fixed income securities and equity investments	$	6,077.7	85	%	$	6,121.0	86	%

The Company, in conjunction with its third-party accounting service provider, obtains an understanding of the methods, models and inputs used by the third-party pricing service and index provider to assess the ongoing appropriateness of vendors’ prices. The Company and its third-party accounting service provider also have controls in place to validate that amounts provided represent fair values. Processes to validate and review pricing include, but are not limited to:

• quantitative analysis (e.g., comparing the quarterly return for each managed portfolio to its target benchmark, with significant differences identified and investigated);

• comparison of market values obtained from pricing services, index providers and broker-dealers against alternative price sources for each security where further investigation is completed when significant differences exist for pricing of individual securities between pricing sources;

• initial and ongoing evaluation of methodologies used by outside parties to calculate fair value; and

• comparison of the fair value estimates to the Company’s knowledge of the current market.

Prices obtained from pricing services, index providers and broker-dealers are not adjusted by us; however, prices provided by a pricing service, index provider or broker-dealer in certain instances may be challenged based on market or information available from internal sources, including those available to the Company’s third-party investment accounting service provider. Subsequent to any challenge, revisions made by the pricing service, index provider or broker-dealer to the quotes are supplied to the Company’s investment accounting service provider.

Management reviews the vendor hierarchy maintained by the Company’s third-party accounting service provider in order to determine which price source provides the most appropriate fair value (i.e., a price obtained from a pricing service with more seniority in the hierarchy will be used over a less senior one in all cases). The hierarchy level assigned to each security in the Company’s available for sale and trading portfolios is based upon its assessment of the transparency and reliability of the inputs used in the valuation as of the measurement date. The hierarchy of index providers and pricing services is determined using various qualitative and quantitative points arising from reviews of the vendors conducted by the Company’s third-party accounting service provider. Vendor reviews include annual onsite due diligence meetings with index providers and pricing services vendors covering valuation methodology, operational walkthroughs and legal and compliance updates. Index providers are assigned the highest priority in the pricing hierarchy due primarily to availability and reliability of pricing information.

Fixed Income Securities. The Company’s fixed income securities are traded on the over-the-counter (“OTC”) market based on prices provided by one or more market makers in each security. Securities such as U.S. Government, U.S. Agency, Foreign Government and investment grade corporate bonds have multiple market makers in addition to readily observable market value indicators such as expected credit spread, except for Treasury securities, over the yield curve. The Company uses a variety of pricing sources to value fixed income securities including those securities that have pay down/prepay features such as mortgage-backed securities and asset-backed securities in order to ensure fair and accurate pricing. The fair value estimates for the investment grade securities in the Company’s portfolio do not use significant unobservable inputs or modeling techniques.

U.S. Government and Agency. U.S. government and agency securities consist primarily of bonds issued by the U.S. Treasury and corporate debt issued by agencies such as the Federal National Mortgage Association (“FNMA”), the Federal Home Loan Mortgage Corporation (“FHLMC”) and the Federal Home Loan Bank. As the fair values of U.S. Treasury securities are based on unadjusted market prices in active markets, they are classified within Level 1. The fair values of U.S. government agency securities are priced using the spread above the risk-free yield curve. As the yields for the risk-free yield curve and the spreads for these securities are observable market inputs, the fair values of U.S. government agency securities are classified within Level 2.

Municipals. The Company’s municipal portfolio comprises bonds issued by U.S. domiciled state and municipality entities. The fair value of these securities is determined using spreads obtained from broker-dealers, trade prices and the new issue market which are Level 2 inputs in the fair value hierarchy. Consequently, these securities are classified within Level 2.

Foreign Government. The issuers for securities in this category are non-U.S. governments and their agencies. The fair values of non-U.S. government bonds, primarily sourced from international indices, are based on unadjusted market prices in active markets and are therefore classified within Level 1. The fair values of the non-U.S. agency securities, again primarily sourced from international indices, are priced using the spread above the risk-free yield curve. As the yields for the risk-free yield curve and the spreads for these securities are observable market inputs, the fair values of non-U.S. agency securities are classified within Level 2. In addition, foreign government securities include a portion of the Emerging Market Debt (“EMD”) portfolio which is also classified within Level 2.

Corporate. Corporate securities consist primarily of U.S. and foreign corporations covering a variety of industries and are for the most part priced by index providers and pricing vendors. Some issuers may participate in the FDIC program or other similar non-U.S. government programs which guarantee timely payment of principal and interest in the event of a default. The fair values of these securities are generally determined using the spread above the risk-free yield curve. Inputs used in the evaluation of these securities include credit data, interest rate data, market observations and sector news, broker-dealer quotes and trade volumes. In addition, corporate securities include a portion of the EMD portfolio. The Company classifies all of these securities within Level 2.

Mortgage-backed Securities. The Company’s residential and commercial mortgage-backed securities consist of bonds issued by the Government National Mortgage Association, the FNMA and the FHLMC as well as private non-agency issuers. The fair values of these securities are determined through the use of a pricing model (including Option Adjusted Spread) which uses prepayment speeds and spreads to determine the appropriate average life of the mortgage-backed security. These spreads are generally obtained from broker-dealers, trade prices and the new issue market. As the significant inputs used to price mortgage-backed securities are observable market inputs, these securities are classified within Level 2.

Asset-backed Securities. The underlying collateral for the Company’s asset-backed securities consists mainly of student loans, automobile loans and credit card receivables. These securities are primarily priced by index providers and pricing vendors. Inputs to the valuation process include broker-dealer quotes and other available trade information, prepayment speeds, interest rate data and credit spreads. The Company classifies these securities within Level 2.

Bank Loans. These are variable rate, senior secured debt instruments issued by non-investment grade companies that are not publicly registered but are the most senior debt in a capital structure and are generally secured by company assets. Although these assets are not as liquid a market as traditional fixed income instruments, they are valued in similar fashion to other fixed maturities, using similar inputs such as yield curves, interest rates and credit spreads. These securities are primarily priced by a third-party pricing vendor. Bank loans are therefore classified within Level 2.

Short-term Investments. Short-term investments comprise highly liquid debt securities with a maturity greater than three months but less than one year from the date of purchase. Short-term investments are valued in a manner similar to the Company’s fixed maturity investments and are classified within Levels 1 and 2.

Equity Securities. Equity securities include U.S. and foreign common stocks and are classified either as trading or available for sale and carried at fair value. These securities are classified within Level 1 as their fair values are based on quoted market prices in active markets from independent pricing sources. As at June 30, 2015, the Company obtained an average of 4.0 quotes per equity investment, compared to 4.0 quotes as at December 31, 2014. Pricing sources used in pricing equities as at June 30, 2015 and December 31, 2014 were all provided by index providers.

Catastrophe Bonds. Catastrophe bonds held by the Company are variable rate fixed income instruments with redemption values adjusted based on the occurrence of a covered event, usually windstorms and earthquakes.  These bonds have been classified as trading and carried at fair value.  Bonds are priced using an average of multiple broker-dealer quotes and, as such, are classified as Level 2. 

Foreign Exchange Contracts. The foreign exchange contracts which the Company uses to mitigate currency risk are characterized as OTC due to their customized nature and the fact that they do not trade on a major exchange. These instruments trade in a deep liquid market, providing substantial price transparency and accordingly are classified as Level 2.

Interest Rate Swaps. The interest rate swaps which the Company uses to mitigate interest rate risk are also characterized as OTC and are valued by the counterparty using quantitative models with multiple market inputs. The market inputs, such as interest rates and yield curves, are observable and the valuation can be compared for reasonableness with third-party pricing services. Consequently, these instruments are classified as Level 2.

Loan Notes Issued by Variable Interest Entities. Silverton, a licensed special purpose insurer, is consolidated into the Company’s group accounts as a VIE. In the fourth quarter of 2013, Silverton issued $65.0 million ($50.0 million third-party funded) loan notes with a maturity date of September 16, 2016. During the fourth quarter of 2014, Silverton issued an additional $85.0 million ($70.0 million third-party funded) loan notes with a maturity date of September 18, 2017. The Company has elected to account for the loan notes at fair value using the guidance as prescribed under ASC 825, Financial Instruments as the Company believes it represents the most meaningful measurement basis for these liabilities. The loan notes are recorded at fair value at each reporting period and, as they are not quoted on an active market and contain significant unobservable inputs, they have been classified as a Level 3 instrument in the fair value hierarchy. The loan notes are unique because they are linked to the specific risks of the Company’s property catastrophe book.

To determine the fair value of the loan notes, the Company runs an internal model which considers the seasonality of the risk assumed under the retrocessional agreement between Aspen Bermuda and Silverton. The seasonality used in the model is determined by applying the percentage of property catastrophe losses planned by the Company’s actuaries to the estimated written premium to determine earned premium for each quarter. The inputs to the internal valuation model are based on Company specific data due to the lack of availability of observable market inputs. Reserves for losses are the most significant unobservable input. An increase in reserves for losses would normally result in a decrease in the fair value of the loan notes while a decrease in reserves would normally result in an increase in the fair value of the loan notes. The observable and unobservable inputs used to determine the fair value of the 2015 Loan Notes and 2014 Loan Notes as at June 30, 2015 and December 31, 2014 are presented in the table below:

At June 30, 2015		Fair Value Level 3			Valuation Method	Observable (O) and  Unobservable (U) inputs	Low		High
	($ in millions)						($ in millions)
Loan notes held by third parties		$	77.8	(1)	Internal Valuation Model	Gross premiums written (O)	$	37.7	$	39.8
						Reserve for losses (U)	$	3.8	$	3.8
						Contract period (O)	N/A		365 days
						Initial value of issuance (O)	$	120.0	$	120.0

At December 31, 2014		Fair Value Level 3			Valuation Method	Observable (O) and  Unobservable (U) inputs	Low		High
	($ in millions)						($ in millions)
Loan notes held by third parties		$	138.6	(1)	Internal Valuation Model	Gross premiums written (O)	$	—	$	40.0
						Reserve for losses (U)	$	—	$	4.6
						Contract period (O)	N/A		365 days
						Initial value of issuance (O)	$	120.0	$	120.0

⁽¹⁾ The amount classified as other payables was $1.6 million and $67.9 million as at June 30, 2015 and December 31, 2014, respectively.

The observable and unobservable inputs represent the potential variation around the inputs used in the valuation model. The contract period is defined in the Silverton loan agreements and the initial value represents the funds received from third parties.

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Derivative Contracts

6 Months Ended

Jun. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Contracts

Derivative Contracts

The following tables summarize information on the location and amounts of derivative fair values on the consolidated balance sheet as at June 30, 2015 and December 31, 2014:

		As at June 30, 2015						As at December 31, 2014
Derivatives Not Designated as Hedging Instruments Under ASC 815	Balance Sheet Location	Notional Amount		Fair Value				Notional Amount		Fair Value
		($ in millions)						($ in millions)
Interest Rate Swaps	Liabilities under Derivative Contracts	$	951.3	$	(1.0	)	(1)	$	951.3	$	0.1		(1)
Foreign Exchange Contracts	Derivatives at Fair Value	$	145.0	$	2.0			$	165.8	$	7.9
Foreign Exchange Contracts	Liabilities under Derivative Contracts	$	283.5	$	(6.2	)		$	237.6	$	(10.5	)

⁽¹⁾  Net of $15.9 million of cash collateral provided to counterparties, Goldman Sachs International ($451.3 million notional) and Crédit Agricole CIB ($500.0 million notional) under respective International Swap Dealers Association agreements, as security for the Company’s net liability position (December 31, 2014 — $22.3 million).

		As at June 30, 2015					As at December 31, 2014
Derivatives Designated as Hedging Instruments Under ASC 815	Balance Sheet Location	Notional Amount		Fair Value			Notional Amount		Fair Value
		($ in millions)					($ in millions)
Foreign Exchange Contracts	Liabilities under Derivative Contracts	$	—	$	—		$	135.8	$	(3.8	)	(1)
Foreign Exchange Contracts	Derivatives at Fair Value	$	56.4	$	2.1	(1)	$	—	$	—

⁽¹⁾  Net of $3.2 million cash collateral (December 31, 2014 — $Nil).

The following tables provide the unrealized and realized gains/(losses) recorded in the statement of operations for the three and six months ended June 30, 2015 and 2014, respectively:

		Amount of Income/(Loss) Recognized in the Statement of Operations and Other Comprehensive Income for the
		Three Months Ended
Derivatives Not Designated as Hedging Instruments Under ASC 815	Location of Income/(Loss) Recognized in the Statement of Operations and Other Comprehensive Income	June 30, 2015			June 30, 2014
		($ in millions)
Foreign Exchange Contracts	Change in Fair Value of Derivatives	$	2.2		$	(1.1	)
Interest Rate Swaps	Change in Fair Value of Derivatives	$	(0.2	)	$	(3.5	)

		Amount of Income/(Loss) Recognized in the Statement of Operations and Other Comprehensive Income for the
		Six Months Ended
Derivatives Not Designated as Hedging Instruments Under ASC 815	Location of Income/(Loss) Recognized in the Statement of Operations and Other Comprehensive Income	June 30, 2015			June 30, 2014
		($ in millions)
Foreign Exchange Contracts	Change in Fair Value of Derivatives	$	(2.4	)	$	1.9
Interest Rate Swaps	Change in Fair Value of Derivatives	$	(3.4	)	$	(5.4	)

		Amount of Income Recognized in the Statement of Operations and Other Comprehensive Income for the
		Three Months Ended
Derivatives Designated as Hedging Instruments Under ASC 815	Location of Income Recognized in the Statement of Operations and Other Comprehensive Income	June 30, 2015		June 30, 2014
		($ in millions)
Foreign Exchange Contracts	General, administrative and corporate expenses	$	0.1	$	—
Foreign Exchange Contracts	Net change from current period hedged transactions	$	5.1	$	—

		Amount of Income/(Loss) Recognized in the Statement of Operations and Other Comprehensive Income for the
		Six Months Ended
Derivatives Designated as Hedging Instruments Under ASC 815	Location of Income/(Loss) Recognized in the Statement of Operations and Other Comprehensive Income	June 30, 2015			June 30, 2014
		($ in millions)
Foreign Exchange Contracts	General, administrative and corporate expenses	$	(2.7	)	$	—
Foreign Exchange Contracts	Net change from current period hedged transactions	$	2.7		$	—

Foreign Exchange Contracts. The Company uses foreign exchange contracts to manage foreign currency risk. A foreign exchange contract involves an obligation to purchase or sell a specified currency at a future date at a price set at the time of the contract. Foreign exchange contracts will not eliminate fluctuations in the value of the Company’s assets and liabilities denominated in foreign currencies but rather allow it to establish a rate of exchange for a future point in time.

As at June 30, 2015, the Company held foreign exchange contracts that were not designated as hedging under ASC 815 with an aggregate notional value of $428.5 million (December 31, 2014 — $403.4 million). The foreign exchange contracts are recorded as derivatives at fair value with changes recorded as a change in fair value of derivatives in the statement of operations. For the three and six months ended June 30, 2015, the impact of foreign exchange contracts on net income was a gain of $2.2 million (June 30, 2014 — charge of $1.1 million) and a loss of $2.4 million (June 30, 2014 — gain of $1.9 million), respectively.

As at June 30, 2015, the Company held foreign exchange contracts that were designated as hedging under ASC 815 with an aggregate notional value of $56.4 million (December 31, 2014 — $135.8 million). The foreign exchange contracts are recorded as derivatives at fair value in the balance sheet with the effective portion recorded in other comprehensive income and the ineffective portion recorded as a change in fair value of derivatives in the statement of operations. The contracts are considered to be effective and therefore, for the three and six months ended June 30, 2015, the movement in other comprehensive income representing the effective portion was a net unrealized gain of $5.1 million (June 30, 2014 — $Nil) and a net unrealized gain of $2.7 million (June 30, 2014 — $Nil), respectively.

As the foreign exchange contracts settle, the realized gain or loss is reclassified from other comprehensive income into general, administration and corporate expenses of the statement of operations and other comprehensive income. For the three and six months ended June 30, 2015 the amount recognized within general, administration and corporate expenses for settled foreign exchange contracts was a realized gain of $0.1 million (June 30, 2014 — $Nil) and a realized loss of $2.7 million (June 30, 2014 — $Nil), respectively.

Interest Rate Swaps. As at June 30, 2015, the Company held fixed for floating interest rate swaps with a total notional amount of $951.3 million (December 31, 2014 — $951.3 million) that are due to mature between November 26, 2015 and November 9, 2020. The interest rate swaps are used in the ordinary course of the Company’s investment activities to partially mitigate the negative impact of rises in interest rates on the market value of the Company’s fixed income portfolio. For the three and six months ended June 30, 2015, there was a charge in respect of the interest rate swaps of $0.2 million (June 30, 2014 — charge of $3.5 million) and a charge of $3.4 million (June 30, 2014 — charge of $5.4 million), respectively.

As at June 30, 2015, cash collateral with a fair value of $15.9 million was held by the Company’s counterparties to support the current valuation of the interest rate swaps (December 31, 2014 — $22.3 million). As at June 30, 2015, no non-cash collateral was transferred to the Company by its counterparties (December 31, 2014 — $Nil). Transfers of cash collateral are recorded on the consolidated balance sheet within Derivatives at Fair Value, while transfers in respect of non-cash collateral are disclosed but not recorded. As at June 30, 2015, no amount was recorded in the consolidated balance sheet for the pledged assets.

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Capital Structure - Summary of Ordinary Shares (Details)	6 Months Ended
	Jun. 30, 2015 shares
Ordinary Shares [Roll Forward]
Ordinary shares in issue at the beginning of the year (in shares)	62,017,368
Ordinary shares issued to employees under the 2003 and 2013 share incentive plans and/or 2008 share purchase plan (in shares)	544,034
Ordinary shares issued to non-employee directors (in shares)	6,806
Ordinary shares repurchased (in shares)	(1,790,333)
Ordinary shares in issue at the end of the period (in shares)	60,777,875

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Share-Based Payments - Narrative (Details)		3 Months Ended		6 Months Ended
	Apr. 06, 2014 GBP (£)	Jun. 30, 2015 USD ($) shares	Jun. 30, 2014 USD ($) shares	Jun. 30, 2015 USD ($) Agreement shares	Jun. 30, 2015 GBP (£) Agreement shares	Jun. 30, 2014 USD ($) shares	Feb. 05, 2015 shares	Feb. 10, 2014 shares	Feb. 05, 2014 shares
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Vesting period				3 years	3 years
Options grants in period (in shares) | shares		0	0	0	0	0
Options exercised (in shares) | shares		0	33,587	83,938	83,938	53,436
Compensation costs		$ 0	$ 0	$ 0		$ 0
Percentage of restricted share units vested and issued				100.00%	100.00%
Achievement One
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Achieved and required performance growth, percentage				5.60%	5.60%
Percentage of initial shares granted				33.33%	33.33%
Achievement Two | Minimum
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Achieved and required performance growth, percentage				5.60%	5.60%
Eligible for vesting, percent				10.00%	10.00%
Achievement Two | Maximum
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Achieved and required performance growth, percentage				11.10%	11.10%
Eligible for vesting, percent				100.00%	100.00%
Achievement Three | Minimum
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Achieved and required performance growth, percentage				11.10%	11.10%
Eligible for vesting, percent				100.00%	100.00%
Achievement Three | Maximum
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Achieved and required performance growth, percentage				22.20%	22.20%
Eligible for vesting, percent				200.00%	200.00%
Employee Share Purchase Plans
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Compensation costs charged in ESPP		$ 100,000	$ 0	$ 200,000		$ 100,000
Sharesave Scheme
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Employee savings under ESPP | £	£ 500				£ 250
Employee contribution period				3 years	3 years
Purchase price of fair market value				(85.00%)	(85.00%)
2013 Share Incentive Plan
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Shares available to grant under incentive plan (in shares) | shares		2,845,683		2,845,683	2,845,683
2003 Share Incentive Plan
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Shares available to grant under incentive plan (in shares) | shares		595,683		595,683	595,683
International Employee Share Purchase Plan
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Employee savings under ESPP				$ 500
Employee contribution period				2 years	2 years
Additional employee contribution period				1 year	1 year
Shares issued (in shares) | shares		2,224	1,200	54,676	54,676	11,194
Investor Options
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Number of arrangements under options and other equity incentives | Agreement				3	3
Performance Shares
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Vesting period				3 years	3 years
Compensation costs		$ 2,000,000	$ 2,800,000	$ 2,200,000		$ 4,200,000
Granted, number of shares (in shares) | shares		0	315,389	277,585	277,585	315,389
Tax benefit from compensation expense		$ (400,000)	$ (1,900,000)	$ (500,000)		$ (3,700,000)
Stock Options
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Vesting period				3 years	3 years
Exercise period				10 years	10 years
Restricted Share Units
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Vesting period				3 years	3 years
Compensation costs		$ 1,500,000	$ 3,000,000	$ 3,100,000		$ 5,800,000
Granted, number of shares (in shares) | shares		3,837	259,640	242,152	242,152	259,640
Fair value adjustment capitalized amount		$ 0	$ 600,000	$ 300,000		$ 1,200,000
Tax benefit from compensation expense		(300,000)	(700,000)	(700,000)		(1,300,000)
Restricted Share Units | Director
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Compensation costs		400,000	400,000	700,000		800,000
RSUs for non-employee directors (in shares) | shares							27,620		27,180
Restricted Share Units | Board of Directors Chairman
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
RSUs for non-employee directors (in shares) | shares							12,154	13,590
Phantom Shares
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Compensation costs		$ 1,100,000	$ 800,000	$ 2,000,000		$ 2,400,000
Granted, number of shares (in shares) | shares		0	154,512	135,651	135,651	154,512
Fair value adjustment capitalized amount		$ 900,000	$ 300,000	$ 2,000,000		$ 500,000
Tax benefit from compensation expense		$ (300,000)	$ (300,000)	$ (700,000)		$ (500,000)
Grants in 2007 | Stock Options
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Vesting period				7 years	7 years
Grant Year 2015 and 2016 | Performance Shares
Non Employee Share Based Compensation Arrangement With Individual Share Based Payments By Title Of Individual [Line Items]
Vesting rule, threshold percent of eligible shares				100.00%	100.00%
Vesting rule, maximum vesting percent of eligible shares				100.00%	100.00%

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Capital Structure - Summary of Authorized and Issued Share Capital (Details) - USD ($) $ / shares in Units, $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Authorized share capital:
Number of ordinary shares (in shares)	969,629,030	969,629,030
Number of non-voting shares (in shares)	6,787,880	6,787,880
Number of preference shares (in shares)	100,000,000	100,000,000
Ordinary Shares 0.15144558¢ per share	$ 1,469	$ 1,469
Non-Voting Shares 0.15144558¢ per share	10	10
Preference Shares 0.15144558¢ per share	152	152
Total authorized share capital	$ 1,631	$ 1,631
Issued share capital:
Number of issued ordinary shares (in shares)	60,777,875	62,017,368
Issued ordinary shares of 0.15144558¢ per share	$ 92	$ 94
Total issued share capital	$ 127	$ 129
Ordinary shares, par value (in usd per share)	$ 0.15144558	$ 0.15144558
Non-voting shares, par value (in usd per share)	0.15144558	0.15144558
Preference shares, par value (in usd per share)	0.15144558	0.15144558
Preference shares, liquidation preference (in usd per share)	$ 25	$ 25
7.401% preference shares
Issued share capital:
Number of issued preference shares of 0.15144558¢ each with a liquidation preference	5,327,500	5,327,500
Issued preference shares of 0.15144558¢ each with a liquidation preference	$ 8	$ 8
Preference shares, par value (in usd per share)	$ 0.15144558	$ 0.15144558
Preference shares, liquidation preference (in usd per share)	$ 25	$ 25
Preference shares, rate	7.401%	7.401%
7.250% preference shares
Issued share capital:
Number of issued preference shares of 0.15144558¢ each with a liquidation preference	6,400,000	6,400,000
Issued preference shares of 0.15144558¢ each with a liquidation preference	$ 10	$ 10
Preference shares, par value (in usd per share)	$ 0.15144558	$ 0.15144558
Preference shares, liquidation preference (in usd per share)	$ 25	$ 25
Preference shares, rate	7.25%	7.25%
5.95% preference shares
Issued share capital:
Number of issued preference shares of 0.15144558¢ each with a liquidation preference	11,000,000	11,000,000
Issued preference shares of 0.15144558¢ each with a liquidation preference	$ 17	$ 17
Preference shares, par value (in usd per share)	$ 0.15144558	$ 0.15144558
Preference shares, liquidation preference (in usd per share)	$ 25	$ 25
Preference shares, rate	5.95%	5.95%

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Commitments and Contingent Liabilities (Tables)

6 Months Ended

Jun. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Schedule of Company's Restricted Assets

The following table details the forms and value of the Company’s restricted assets as at June 30, 2015 and December 31, 2014:

	As at June 30, 2015			As at December 31, 2014
	($ in millions, except percentages)
Regulatory trusts and deposits:
Affiliated transactions	$	978.9		$	1,086.9
Third party	2,182.1			2,183.4
Letters of credit / guarantees(1)	710.5			778.7
Total restricted assets	$	3,871.5		$	4,049.0
Total as percent of cash and invested assets	45.5		%	47.0		%

⁽¹⁾  As of June 30, 2015, the Company had pledged funds of $701.3 million and £9.2 million (December 31, 2014 — $764.4 million and £9.2 million) as collateral for the secured letters of credit.

Amounts Outstanding under Operating Leases

Amounts outstanding under operating leases net of subleases as of June 30, 2015 were:

	2015		2016		2017		2018		2019		Later Years		Total
	($ in millions)
Operating Lease Obligations	$	6.8	$	9.8	$	8.5	$	7.0	$	6.1	$	12.9	$	51.1

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Fair Value Measurements - Reconciliation of Liabilities Using Level 3 Inputs (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Loan notes issued by variable interest entities, at fair value (classified as a current liability)		$ (1.6)		$ (1.6)		$ (67.9)
Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Loan notes issued by variable interest entities, at fair value (classified as a current liability)		(1.6)		(1.6)		$ (67.9)
Level 3 | Silverton 2104
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	[1]	76.7	$ 53.4	138.6	$ 50.0
Distributed		(2.2)	0.0	(67.0)	0.0
Total change in fair value included in the statement of operations		3.3	2.6	6.2	6.0
Ending balance	[1]	$ 77.8	$ 56.0	$ 77.8	$ 56.0

[1] The amount classified as other payables was $1.6 million and $67.9 million as at June 30, 2015 and December 31, 2014, respectively.

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Intangible Assets

6 Months Ended

Jun. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible Assets

The following tables provide a summary of the Company’s intangible assets for the three and six months ended June 30, 2015 and 2014:

	Three Months Ended June 30, 2015								Three Months Ended June 30, 2014
	Trade Mark		Insurance Licenses		Other		Total		Trade Mark		Insurance Licenses		Other			Total
	($ in millions)								($ in millions)
Intangible Assets
Beginning of the period	$	1.6	$	16.6	$	—	$	18.2	$	1.6	$	16.6	$	0.1		$	18.3
Amortization	—		—		—		—		—		—		(0.1		)	(0.1		)
End of the period	$	1.6	$	16.6	$	—	$	18.2	$	1.6	$	16.6	$	—		$	18.2

	Six Months Ended June 30, 2015								Six Months Ended June 30, 2014
	Trade Mark		Insurance Licenses		Other		Total		Trade Mark		Insurance Licenses		Other			Total
	($ in millions)								($ in millions)
Intangible Assets
Beginning of the period	$	1.6	$	16.6	$	—	$	18.2	$	1.6	$	16.6	$	0.2		$	18.4
Amortization	—		—		—		—		—		—		(0.2		)	(0.2		)
End of the period	$	1.6	$	16.6	$	—	$	18.2	$	1.6	$	16.6	$	—		$	18.2

License to use the “Aspen” Trademark. On April 5, 2005, the Company entered into an agreement with Aspen (Actuaries and Pension Consultants) Plc to acquire the right to use the Aspen trademark in the United Kingdom. The consideration paid was approximately $1.6 million. As at June 30, 2015, the value of the license to use the Aspen trademark was $1.6 million (December 31, 2014 — $1.6 million). The trademark has an indefinite useful life and is tested for impairment annually or when events or changes in circumstances indicate that the asset might be impaired.

Insurance Licenses. The total value of the licenses as at June 30, 2015 was $16.6 million (December 31, 2014 — $16.6 million). This includes $10.0 million of acquired licenses held by AAIC, $4.5 million of acquired licenses held by Aspen Specialty and $2.1 million of acquired licenses held by Aspen U.K. The insurance licenses are considered to have an indefinite life and are not amortized. The licenses are tested for impairment annually or when events or changes in circumstances indicate that the asset might be impaired.

Other. In 2010, the Company purchased APJ Continuation Limited and its subsidiaries (“APJ”) for an aggregate consideration of $4.8 million. The Board of Directors assessed the fair value of the net tangible and financial assets acquired at $1.2 million. The $3.6 million intangible asset represented the Company’s assessment of the value of renewal rights and distribution channels ($2.2 million) and the lock-in period for employees associated with the business ($1.4 million). The asset was amortized over a five-year period and the value as at June 30, 2015 was $Nil (December 31, 2014 — $Nil).

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Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

Summary of Gross and Net Written and Earned Premiums, Underwriting Results, Ratios and Reserves for Each of Company's Business Segments

The following tables provide a summary of gross and net written and earned premiums, underwriting results, ratios and reserves for each of the Company’s business segments for the three months ended June 30, 2015 and 2014:

	Three Months Ended June 30, 2015
	Reinsurance			Insurance			Total
	($ in millions)
Underwriting Revenues
Gross written premiums	$	260.7		$	462.1		$	722.8
Net written premiums	238.2			406.2			644.4
Gross earned premiums	287.2			423.2			710.4
Net earned premiums	268.3			341.1			609.4
Underwriting Expenses
Losses and loss adjustment expenses	116.3			244.2			360.5
Amortization of deferred policy acquisition costs	50.4			63.7			114.1
General and administrative expenses	35.4			45.2			80.6
Underwriting income/(loss)	$	66.2		$	(12.0	)	54.2
Corporate expenses							(14.8		)
Net investment income							46.7
Realized and unrealized investment gains							13.5
Realized and unrealized investment losses							(28.8		)
Change in fair value of loan notes issued by variable interest entities							(3.3		)
Change in fair value of derivatives							2.0
Interest expense on long term debt							(7.3		)
Net realized and unrealized foreign exchange (losses)							(11.6		)
Other income							(1.2		)
Other expenses							1.8
Income before tax							$	51.2
Net reserves for loss and loss adjustment expenses	$	2,411.6		$	2,067.0		$	4,478.6
Ratios
Loss ratio	43.3		%	71.6		%	59.2		%
Policy acquisition expense ratio	18.8			18.7			18.7
General and administrative expense ratio	13.2			13.3			15.7			(1)
Expense ratio	32.0			32.0			34.4
Combined ratio	75.3		%	103.6		%	93.6		%

⁽¹⁾  The general and administrative expense ratio in the total column includes corporate expenses.

	Three Months Ended June 30, 2014
	Reinsurance			Insurance			Total
	( $ in millions)
Underwriting Revenues
Gross written premiums	$	298.4		$	480.9		$	779.3
Net written premiums	286.9			399.5			686.4
Gross earned premiums	289.7			404.5			694.2
Net earned premiums	278.8			337.4			616.2
Underwriting Expenses
Losses and loss adjustment expenses	125.0			212.1			337.1
Amortization of deferred policy acquisition costs	49.8			59.1			108.9
General and administrative expenses	35.8			51.1			86.9
Underwriting income	$	68.2		$	15.1		83.3
Corporate expenses							(21.9		)
Net investment income							46.1
Realized and unrealized investment gains							34.6
Realized and unrealized investment losses							(3.3		)
Change in fair value of loan notes issued by variable interest entities							(2.6		)
Change in fair value of derivatives							(4.6		)
Interest expense on long term debt							(7.3		)
Net realized and unrealized foreign exchange gains							10.7
Other income							3.2
Other expenses							(1.2		)
Income before tax							$	137.0
Net reserves for loss and loss adjustment expenses	$	2,584.8		$	1,851.0		$	4,435.8
Ratios
Loss ratio	44.8		%	62.9		%	54.7		%
Policy acquisition expense ratio	17.9			17.5			17.7
General and administrative expense ratio	12.8			15.1			17.7			(1)
Expense ratio	30.7			32.6			35.4
Combined ratio	75.5		%	95.5		%	90.1		%

⁽¹⁾  The general and administrative expense ratio in the total column includes corporate expenses.

The following tables provide a summary of gross and net written and earned premiums, underwriting results, ratios and reserves for each of the Company’s business segments for the six months ended June 30, 2015 and 2014:

	Six Months Ended June 30, 2015
	Reinsurance			Insurance			Total
	($ in millions)
Underwriting Revenues
Gross written premiums	$	745.5		$	896.5		$	1,642.0
Net written premiums	680.3			727.3			1,407.6
Gross earned premiums	553.0			838.3			1,391.3
Net earned premiums	517.7			685.3			1,203.0
Underwriting Expenses
Losses and loss adjustment expenses	221.8			444.8			666.6
Amortization of deferred policy acquisition costs	103.8			129.6			233.4
General and administrative expenses	67.8			100.5			168.3
Underwriting income	$	124.3		$	10.4		134.7
Corporate expenses							(29.3		)
Net investment income							94.1
Realized and unrealized investment gains							70.9
Realized and unrealized investment losses							(43.3		)
Change in fair value of loan notes issued by variable interest entities							(6.2		)
Change in fair value of derivatives							(5.8		)
Interest expense on long term debt							(14.7		)
Net realized and unrealized foreign exchange (losses)							(18.0		)
Other income							2.7
Other expenses							(0.8		)
Income before tax							$	184.3
Net reserves for loss and loss adjustment expenses	$	2,411.6		$	2,067.0		$	4,478.6
Ratios
Loss ratio	42.8		%	64.9		%	55.4		%
Policy acquisition expense ratio	20.1			18.9			19.4
General and administrative expense ratio	13.1			14.7			16.4			(1)
Expense ratio	33.2			33.6			35.8
Combined ratio	76.0		%	98.5		%	91.2		%

⁽¹⁾  The general and administrative expense ratio in the total column includes corporate expenses.

	Six Months Ended June 30, 2014
	Reinsurance			Insurance			Total
	( $ in millions)
Underwriting Revenues
Gross written premiums	$	770.6		$	864.2		$	1,634.8
Net written premiums	729.5			654.4			1,383.9
Gross earned premiums	568.2			778.1			1,346.3
Net earned premiums	545.5			637.2			1,182.7
Underwriting Expenses
Losses and loss adjustment expenses	235.4			389.8			625.2
Amortization of deferred policy acquisition costs	100.2			120.7			220.9
General and administrative expenses	68.6			97.0			165.6
Underwriting income	$	141.3		$	29.7		171.0
Corporate expenses							(38.8		)
Net investment income							95.6
Realized and unrealized investment gains							52.5
Realized and unrealized investment losses							(7.6		)
Change in fair value of loan notes issued by variable interest entities							(6.0		)
Change in fair value of derivatives							(3.5		)
Interest expense on long term debt							(14.7		)
Net realized and unrealized foreign exchange gains							10.8
Other income							3.8
Other expenses							(1.9		)
Income before tax							$	261.2
Net reserves for loss and loss adjustment expenses	$	2,584.8		$	1,851.0		$	4,435.8
Ratios
Loss ratio	43.2		%	61.2		%	52.9		%
Policy acquisition expense ratio	18.4			18.9			18.7
General and administrative expense ratio	12.6			15.2			17.3			(1)
Expense ratio	31.0			34.1			36.0
Combined ratio	74.2		%	95.3		%	88.9		%

⁽¹⁾  The general and administrative expense ratio in the total column includes corporate expenses.

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Variable Interest Entities - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) Investment variable_interest_entity	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Investment variable_interest_entity	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Dec. 27, 2013 USD ($)	Oct. 02, 2012
Variable Interest Entity [Line Items]
Number of investments in variable interest entities | Investment	2		2
Number of variable interest entities | variable_interest_entity	2		2
Total aggregate unpaid balance	$ 549,200,000		$ 549,200,000		$ 549,100,000
Silverton 2015
Variable Interest Entity [Line Items]
Loans issued					85,000,000
Loan notes issued by variable interest entities, at fair value	76,200,000		76,200,000		$ 70,000,000
Chaspark
Variable Interest Entity [Line Items]
Percentage of ownership acquired							58.50%
Change in fair value of investment	$ 0	$ 0	$ 0	$ 0
Silverton 2014
Variable Interest Entity [Line Items]
Loans issued						$ 65,000,000
Percentage of interests acquired	100.00%		100.00%
Silverton 2014 | Third party
Variable Interest Entity [Line Items]
Loans issued						$ 50,000,000
Silverton 2014 | Loan Notes 2014
Variable Interest Entity [Line Items]
Fair value of 2014 Loan Notes	$ 2,100,000		$ 2,100,000
Silverton 2014 | Silverton Loan Notes
Variable Interest Entity [Line Items]
Repayments of debt			87,000,000
Silverton 2014 | Silverton Loan Notes | Aspen Holdings and Third Parties
Variable Interest Entity [Line Items]
Total aggregate unpaid balance	2,100,000		2,100,000
Silverton 2014 | Silverton Loan Notes | Aspen Holdings
Variable Interest Entity [Line Items]
Maximum loss exposure, amount	500,000		500,000
Silverton 2014 | Investor | Loan Notes 2014
Variable Interest Entity [Line Items]
Fair value of 2014 Loan Notes	1,600,000		1,600,000
Repayments of debt			67,000,000
Total aggregate unpaid balance	1,600,000		1,600,000
Long-term debt, current maturities	1,600,000		1,600,000
Silverton 2015 | Silverton Loan Notes | Aspen Holdings
Variable Interest Entity [Line Items]
Maximum loss exposure, amount	16,300,000		16,300,000
Silverton 2015 | Loan Notes 2015
Variable Interest Entity [Line Items]
Fair value of 2014 Loan Notes	92,600,000		92,600,000
Silverton 2015 | Loan Notes 2015 | Aspen Holdings
Variable Interest Entity [Line Items]
Fair value of 2014 Loan Notes	$ 92,600,000		$ 92,600,000

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Investments - Net Realized and Unrealized Investment Gains and Losses and Change in Unrealized Gains and Losses on Investments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Fixed income maturities — gross realized gains	$ 2,100,000	$ 3,700,000	$ 35,600,000	$ 6,700,000
Fixed income maturities — gross realized (losses)	(2,700,000)	(1,800,000)	(3,900,000)	(4,400,000)
Other than Temporary Impairment Losses, Investments	0	(700,000)	0	(700,000)
Catastrophe bonds	(800,000)	(100,000)	(800,000)	0
Net change in gross unrealized gains	(23,500,000)	25,000,000	(22,700,000)	34,200,000
Total net realized and unrealized investment gains recorded in the statement of operations	(15,300,000)	31,300,000	27,600,000	44,900,000
Change in available for sale net unrealized gains (losses):
Fixed income securities	(77,400,000)	31,400,000	(50,100,000)	53,500,000
Short-term investments	(100,000)	0	0	0
Equity securities	(100,000)	1,700,000	(27,400,000)	2,200,000
Total change in pre-tax available for sale unrealized gains	(77,600,000)	33,100,000	(77,500,000)	55,700,000
Change in taxes	4,200,000	(3,600,000)	1,300,000	(5,900,000)
Total change in net unrealized (losses) gains, net of taxes, recorded in other comprehensive income	(73,400,000)	29,500,000	(76,200,000)	49,800,000
Fixed income maturities - Available for sale
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Fixed income maturities — gross realized gains	1,100,000	2,000,000	7,300,000	6,400,000
Fixed income maturities — gross realized (losses)	(600,000)	(1,400,000)	(1,100,000)	(4,500,000)
Equity Securities - Available for Sale
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Equity securities — gross realized gains	0	4,200,000	31,900,000	5,500,000
Equity securities — gross realized (losses)	0	0	(3,000,000)	0
Fixed Income Maturities - Trading
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Fixed income maturities — gross realized gains	1,300,000	2,800,000	3,300,000	4,700,000
Fixed income maturities — gross realized (losses)	(400,000)	(1,000,000)	(2,600,000)	(2,200,000)
Equity Securities - Trading
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Equity securities — gross realized gains	11,900,000	700,000	28,400,000	1,700,000
Equity securities — gross realized (losses)	$ (4,300,000)	$ (200,000)	$ (13,100,000)	$ (200,000)

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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Ordinary shares	Preference shares	Non-controlling interest	Additional paid-in capital	Additional paid-in capital Ordinary shares	Retained earnings	Retained earnings Ordinary shares	Retained earnings Preference shares	Cumulative foreign currency translation adjustments, net of taxes:	Loss on derivatives, net of taxes:	Unrealized appreciation on investments, net of taxes:
Shareholder's equity, beginning balance at Dec. 31, 2013		$ 0.1	$ 0.0	$ (0.3)	$ 1,297.4		$ 1,783.3			$ 88.6	$ 0.0	$ 130.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net change attributable to non-controlling interest for the period	$ (0.1)			0.1			(0.1)
New ordinary shares issued						$ 1.8
Ordinary shares repurchased and canceled						(30.9)
Share-based compensation					8.4
Net income for the period	251.2						251.2
Dividends on ordinary shares								$ (24.8)
Dividends on preference shares	(18.9)								$ (18.9)
Change for the period, net of income tax										18.0		49.8
Shareholder's equity, ending balance at Jun. 30, 2014	3,554.2	0.1	0.0	(0.2)	1,276.7		1,990.7			106.6	0.0	180.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net change from current period hedged transaction											0.0
Total accumulated other comprehensive income, net of taxes	286.9
Total accumulated other comprehensive income, net of taxes	234.3
Shareholder's equity, beginning balance at Dec. 31, 2014	3,419.3	0.1	0.0	0.5	1,134.3		2,050.1			72.7	(3.8)	165.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net change attributable to non-controlling interest for the period	(0.5)			0.5			(0.5)
New ordinary shares issued						$ 4.0
Share-based compensation					7.1
Net income for the period	177.0						177.0
Dividends on ordinary shares								$ (25.4)
Dividends on preference shares	(18.9)								$ (18.9)
Change for the period, net of income tax										(42.3)		(76.2)
Shareholder's equity, ending balance at Jun. 30, 2015	3,363.6	$ 0.1	$ 0.0	$ 1.0	$ 1,061.7		$ 2,182.3			$ 30.4	(1.1)	$ 89.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net change from current period hedged transaction											$ 2.7
Total accumulated other comprehensive income, net of taxes	$ 118.5

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Earnings per Ordinary Share

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Earnings per Ordinary Share

Earnings per Ordinary Share

Basic earnings per ordinary share are calculated by dividing net income available to holders of Aspen Holdings’ ordinary shares by the weighted average number of ordinary shares outstanding. Diluted earnings per ordinary share are based on the weighted average number of ordinary shares and dilutive potential ordinary shares outstanding during the period of calculation using the treasury stock method. The following table sets forth the computation of basic and diluted earnings per share for the three and six months ended June 30, 2015 and 2014, respectively:

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
	($ in millions, except share and per share amounts)
Net income	$	49.0		$	130.8		$	177.0		$	251.2
Preference share dividends	(9.4		)	(9.4		)	(18.9		)	(18.9		)
Net profit attributable to non-controlling interest	(0.5		)	—			(0.5		)	(0.1		)
Basic and diluted net income available to ordinary shareholders	39.1			121.4			157.6			232.2
Ordinary shares:
Basic weighted average ordinary shares	61,408,633			65,447,128			61,775,646			65,368,675
Weighted average effect of dilutive securities(1)	1,488,274			1,253,240			1,389,217			1,277,644
Total diluted weighted average ordinary shares	62,896,907			66,700,368			63,164,863			66,646,319
Earnings per ordinary share:
Basic	$	0.64		$	1.85		$	2.55		$	3.55
Diluted	$	0.62		$	1.82		$	2.50		$	3.48

⁽¹⁾  Dilutive securities comprise: employee options, restricted share units and performance shares associated with the Company’s long term incentive plan, employee share purchase plans and director restricted stock units and options as described in Note 14.

Dividends. On July 22, 2015, the Company’s Board of Directors (“Board of Directors”) declared the following quarterly dividends:

	Dividend		Payable on:	Record Date:
Ordinary shares	$	0.21	August 25, 2015	August 7, 2015
7.401% preference shares	$	0.462563	October 1, 2015	September 15, 2015
7.250% preference shares	$	0.4531	October 1, 2015	September 15, 2015
5.95% preference shares	$	0.3719	October 1, 2015	September 15, 2015

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Derivative Contracts - Gain/(Loss) Recognized in Income on Derivative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contract settlement	$ 100,000	$ 0
Derivatives Not Designated as Hedging Instruments | Foreign Exchange Contracts | Change in Fair Value of Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	2,200,000	(1,100,000)	$ (2,400,000)	$ 1,900,000
Derivatives Not Designated as Hedging Instruments | Interest Rate Swaps | Change in Fair Value of Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	(200,000)	(3,500,000)	(3,400,000)	(5,400,000)
Designated as Hedging Instrument | Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contract settlement	100,000	0	(2,700,000)	0
Designated as Hedging Instrument | Foreign Exchange Contracts | Change in Fair Value of Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Fair Value	$ 5,100,000	$ 0	$ 2,700,000	$ 0

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Commitments and Contingent Liabilities - Schedule of Company's Restricted Assets (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Total restricted assets		$ 3,871.5	$ 4,049.0
Total as percent of cash and invested assets		45.50%	47.00%
Letters of credit / guarantees
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Total restricted assets	[1]	$ 710.5	$ 778.7
Affiliated transactions
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Total restricted assets		978.9	1,086.9
Third party
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Total restricted assets		$ 2,182.1	$ 2,183.4

[1] As of June 30, 2015, the Company had pledged funds of $701.3 million and £9.2 million (December 31, 2014 — $764.4 million and £9.2 million) as collateral for the secured letters of credit.

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Investments (Tables)

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Summary of Investment Income

Investment Income. The following table summarizes investment income for the three and six months ended June 30, 2015 and 2014:

	For the Three Months Ended						For the Six Months Ended
	June 30, 2015			June 30, 2014			June 30, 2015			June 30, 2014
	($ in millions)						($ in millions)
Fixed income securities — Available for sale	$	35.5		$	37.3		$	70.7		$	75.8
Fixed income securities — Trading	6.9			6.6			13.9			13.2
Short-term investments — Available for sale	0.2			0.3			0.6			0.6
Fixed term deposits (included in cash and cash equivalents)	0.9			1.1			2.0			1.9
Equity securities — Available for sale	0.1			1.0			0.1			2.5
Equity securities — Trading	5.7			3.1			11.9			7.0
Catastrophe bonds — Trading	0.5			0.2			0.9			0.4
Total	$	49.8		$	49.6		$	100.1		$	101.4
Investment expenses	(3.1		)	(3.5		)	(6.0		)	(5.8		)
Net investment income	$	46.7		$	46.1		$	94.1		$	95.6

Net Realized and Unrealized Investment Gains and Losses and Change in Unrealized Gains and Losses on Investments

The following table summarizes the net realized and unrealized investment gains and losses recorded in the statement of operations and the change in unrealized gains and losses on investments recorded in other comprehensive income for the three and six months ended June 30, 2015 and 2014:

	For the Three Months Ended						For the Six Months Ended
	June 30, 2015			June 30, 2014			June 30, 2015			June 30, 2014
	($ in millions)						($ in millions)
Available for sale:
Fixed income securities — gross realized gains	$	1.1		$	2.0		$	7.3		$	6.4
Fixed income securities — gross realized (losses)	(0.6		)	(1.4		)	(1.1		)	(4.5		)
Equity securities — gross realized gains	—			4.2			31.9			5.5
Equity securities — gross realized (losses)	—			—			(3.0		)	—
Other-than-temporary impairments	—			(0.7		)	—			(0.7		)
Trading:
Fixed income securities — gross realized gains	1.3			2.8			3.3			4.7
Fixed income securities — gross realized (losses)	(0.4		)	(1.0		)	(2.6		)	(2.2		)
Equity securities — gross realized gains	11.9			0.7			28.4			1.7
Equity securities — gross realized (losses)	(4.3		)	(0.2		)	(13.1		)	(0.2		)
Catastrophe bonds	(0.8		)	(0.1		)	(0.8		)	—
Net change in gross unrealized gains	(23.5		)	25.0			(22.7		)	34.2
Total net realized and unrealized investment gains recorded in the statement of operations	$	(15.3	)	$	31.3		$	27.6		$	44.9
Change in available for sale net unrealized gains (losses):
Fixed income securities	(77.4		)	31.4			(50.1		)	53.5
Short-term investments	(0.1		)	—			—			—
Equity securities	(0.1		)	1.7			(27.4		)	2.2
Total change in pre-tax available for sale unrealized gains	(77.6		)	33.1			(77.5		)	55.7
Change in taxes	4.2			(3.6		)	1.3			(5.9		)
Total change in net unrealized (losses) gains, net of taxes, recorded in other comprehensive income	$	(73.4	)	$	29.5		$	(76.2	)	$	49.8

Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Available for Sale Investments in Fixed Income Maturities, Short-Term Investments and Equities

Fixed Income Securities, Short-Term Investments and Equities — Available For Sale. The following tables present the cost or amortized cost, gross unrealized gains and losses and estimated fair market value of available for sale investments in fixed income securities, short-term investments and equity securities as at June 30, 2015 and December 31, 2014:

	As at June 30, 2015
	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	($ in millions)
U.S. government	$	1,056.2	$	19.5	$	(1.1	)	$	1,074.6
U.S. agency	175.8		6.3		(0.1		)	182.0
Municipal	27.8		1.7		—			29.5
Corporate	2,373.3		59.6		(12.1		)	2,420.8
Non-U.S. government-backed corporate	77.5		0.9		(0.1		)	78.3
Foreign government	650.3		12.5		(1.1		)	661.7
Asset-backed	136.6		2.1		—			138.7
Non-agency commercial mortgage-backed	33.4		2.2		—			35.6
Agency mortgage-backed	981.9		32.1		(5.5		)	1,008.5
Total fixed income securities — Available for sale	5,512.8		136.9		(20.0		)	5,629.7
Total short-term investments — Available for sale	184.0		0.1		—			184.1
Total	$	5,696.8	$	137.0	$	(20.0	)	$	5,813.8

	As at December 31, 2014
	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	($ in millions)
U.S. government	$	1,074.2	$	21.5	$	(1.3	)	$	1,094.4
U.S. agency	190.0		7.5		(0.1		)	197.4
Municipal	29.1		2.4		—			31.5
Corporate	2,244.7		79.9		(5.2		)	2,319.4
Non-U.S. government-backed corporate	76.8		1.2		—			78.0
Foreign government	648.6		17.3		(0.2		)	665.7
Asset-backed	141.3		2.4		(0.2		)	143.5
Non-agency commercial mortgage-backed	41.5		3.3		—			44.8
Agency mortgage-backed	1,016.7		40.8		(2.2		)	1,055.3
Total fixed income securities — Available for sale	5,462.9		176.3		(9.2		)	5,630.0
Total short-term investments — Available for sale	258.2		0.1		—			258.3
Total equity securities — Available for sale	82.6		27.3		—			109.9
Total	$	5,803.7	$	203.7	$	(9.2	)	$	5,998.2

Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Trading Investments in Fixed Income Maturities

Fixed Income Securities, Short-Term Investments, Equities and Catastrophe Bonds — Trading. The following tables present the cost or amortized cost, gross unrealized gains and losses, and estimated fair market value of trading investments in fixed income securities, short-term investments, equity securities and catastrophe bonds as at June 30, 2015 and December 31, 2014:

	As at June 30, 2015
	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	($ in millions)
U.S. government	$	3.4	$	—	$	—		$	3.4
Municipal	0.5		—		—			0.5
Corporate	535.9		8.7		(4.5		)	540.1
Foreign government	131.4		3.3		(0.9		)	133.8
Asset-backed	19.6		0.1		—			19.7
Bank loans	80.6		0.2		(0.6		)	80.2
Total fixed income securities — Trading	771.4		12.3		(6.0		)	777.7
Total short-term investments — Trading	1.1		—		—			1.1
Total equity securities — Trading	717.5		48.6		(36.8		)	729.3
Total catastrophe bonds — Trading	32.6		—		(0.3		)	32.3
Total	$	1,522.6	$	60.9	$	(43.1	)	$	1,540.4

	As at December 31, 2014
	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	($ in millions)
U.S. agency	$	0.2	$	—	$	—		$	0.2
Municipal	1.1		—		—			1.1
Corporate	520.9		11.7		(2.8		)	529.8
Foreign government	137.3		4.3		(1.5		)	140.1
Asset-backed	14.6		0.1		—			14.7
Bank loans	86.8		—		(1.7		)	85.1
Total fixed income securities — Trading	760.9		16.1		(6.0		)	771.0
Total short-term investments — Trading	0.2		—		—			0.2
Total equity securities — Trading	585.2		55.5		(24.7		)	616.0
Total catastrophe bonds — Trading	34.4		0.4		—			34.8
Total	$	1,380.7	$	72.0	$	(30.7	)	$	1,422.0

Other Investments

The tables below show the Company’s investments in the MVI and Chaspark for the three and six months ended June 30, 2015:

	For the Three Months Ended June 30, 2015
	MVI		Chaspark		Total
	($ in millions)
Opening and closing undistributed value of investment	$	0.8	$	8.7	$	9.5

	For the Six Months Ended June 30, 2015
	MVI		Chaspark		Total
	($ in millions)
Opening undistributed value of investment as at January 1, 2015	$	—	$	8.7	$	8.7
Initial investment	0.8		—		$	0.8
Closing value of investment as at June 30, 2015	$	0.8	$	8.7	$	9.5

Summary of Fixed Maturities

Fixed Income Securities. The scheduled maturity distribution of available for sale fixed income securities as at June 30, 2015 and December 31, 2014 is set forth below. Actual maturities may differ from contractual maturities because issuers of securities may have the right to call or prepay obligations with or without call or prepayment penalties.

	As at June 30, 2015
	Amortized Cost or Cost		Fair Market Value		Average S&P Ratings by Maturity
	($ in millions)
Due one year or less	$	632.9	$	638.4	AA
Due after one year through five years	2,575.0		2,636.3		AA-
Due after five years through ten years	1,064.3		1,077.3		A+
Due after ten years	88.7		94.9		A+
Subtotal	4,360.9		4,446.9
Non-agency commercial mortgage-backed	33.4		35.6		AA+
Agency mortgage-backed	981.9		1,008.5		AA+
Asset-backed	136.6		138.7		AAA
Total fixed income securities — Available for sale	$	5,512.8	$	5,629.7

	As at December 31, 2014
	Amortized Cost or Cost		Fair Market Value		Average S&P Ratings by Maturity
	($ in millions)
Due one year or less	$	590.2	$	594.7	AA
Due after one year through five years	2,552.0		2,620.8		AA-
Due after five years through ten years	1,023.5		1,059.9		A+
Due after ten years	97.7		111.0		A+
Subtotal	4,263.4		4,386.4
Non-agency commercial mortgage-backed	41.5		44.8		AA+
Agency mortgage-backed	1,016.7		1,055.3		AA+
Asset-backed	141.3		143.5		AAA
Total fixed income securities — Available for sale	$	5,462.9	$	5,630.0

Aggregate Fair Value and Gross Unrealized Loss by Type of Security

Gross Unrealized Loss. The following tables summarize as at June 30, 2015 and December 31, 2014 by type of security, the aggregate fair value and gross unrealized loss by length of time the security has been in an unrealized loss position for the Company’s available for sale portfolio:

	As at June 30, 2015
	0-12 months					Over 12 months					Total
	Fair Market Value		Gross Unrealized Loss			Fair Market Value		Gross Unrealized Loss			Fair Market Value		Gross Unrealized Loss			Number of Securities
	($ in millions)
U.S. government	$	125.8	$	(1.0	)	$	40.6	$	(0.1	)	$	166.4	$	(1.1	)	28
U.S. agency	3.9		(0.1		)	5.0		—			8.9		(0.1		)	4
Municipal	1.9		—			—		—			1.9		—			3
Corporate	829.2		(10.6		)	75.0		(1.5		)	904.2		(12.1		)	332
Non-U.S. government-backed corporate	10.3		(0.1		)	—		—			10.3		(0.1		)	5
Foreign government	150.9		(1.0		)	3.7		(0.1		)	154.6		(1.1		)	23
Asset-backed	29.6		—			12.1		—			41.7		—			30
Agency mortgage-backed	235.0		(3.5		)	67.9		(2.0		)	302.9		(5.5		)	78
Total fixed income securities — Available for sale	1,386.6		(16.3		)	204.3		(3.7		)	1,590.9		(20.0		)	503
Total short-term investments — Available for sale	54.6		—			—		—			54.6		—			10
Total	$	1,441.2	$	(16.3	)	$	204.3	$	(3.7	)	$	1,645.5	$	(20.0	)	513

	As at December 31, 2014
	0-12 months					Over 12 months					Total
	Fair Market Value		Gross Unrealized Loss			Fair Market Value		Gross Unrealized Loss			Fair Market Value		Gross Unrealized Loss			Number of Securities
	($ in millions)
U.S. government	$	166.1	$	(0.5	)	$	79.4	$	(0.8	)	$	245.5	$	(1.3	)	39
U.S. agency	25.1		—			4.9		(0.1		)	30.0		(0.1		)	7
Municipal	—		—			—		—			—		—			0
Corporate	459.4		(2.1		)	171.3		(3.1		)	630.7		(5.2		)	274
Non-U.S. government-backed corporate	0.7		—			—		—			0.7		—			1
Foreign government	30.4		—			44.2		(0.2		)	74.6		(0.2		)	16
Asset-backed	43.7		(0.1		)	11.7		(0.1		)	55.4		(0.2		)	43
Agency mortgage-backed	64.7		(0.3		)	111.7		(1.9		)	176.4		(2.2		)	48
Total fixed income securities — Available for sale	790.1		(3.0		)	423.2		(6.2		)	1,213.3		(9.2		)	428
Total short-term investments — Available for sale	4.6		—			—		—			4.6		—			3
Total	$	794.7	$	(3.0	)	$	423.2	$	(6.2	)	$	1,217.9	$	(9.2	)	431

Analysis of Investment Purchases/Sales and Maturities

Investment Purchases and Sales. The following table summarizes investment purchases, sales and maturities for the three and six months ended June 30, 2015 and 2014:

	For the Three Months Ended						For the Six Months Ended
	June 30, 2015			June 30, 2014			June 30, 2015			June 30, 2014
	($ in millions)						($ in millions)
(Purchases) of fixed income securities — Available for sale	$	(455.6	)	$	(380.9	)	$	(939.3	)	$	(918.1	)
(Purchases) of fixed income securities — Trading	(122.1		)	(206.8		)	(275.5		)	(398.9		)
(Purchases) of equity securities — Trading	(82.2		)	(67.1		)	(268.9		)	(118.9		)
Proceeds from sales and maturities of fixed income securities — Available for sale	320.8			417.1			861.5			1,015.9
Proceeds from sales and maturities of fixed income securities — Trading	130.7			190.9			264.5			372.2
Proceeds from sales of equity securities — Available for sale	—			11.6			108.6			15.6
Proceeds from sales of equity securities — Trading	67.4			12.9			151.1			18.2
Net change in (payable)/receivable for securities (purchased)/sold	(10.1		)	6.2			5.8			19.8
(Purchases) of short-term investments — Available for sale	(47.2		)	(137.6		)	(109.3		)	(268.9		)
Sale of short-term investments — Available for sale	49.0			23.5			172.4			92.9
(Purchases) of short-term investments — Trading	(2.9		)	(70.2		)	(15.7		)	(80.2		)
Sale of short-term investments — Trading	2.5			56.2			14.8			66.2
Net proceeds/(purchases) of catastrophe bonds — Trading	—			(12.2		)	1.8			(24.3		)
Proceeds from other investments	—			—			—			37.3
Net (purchases) for the period	$	(149.7	)	$	(156.4	)	$	(28.2	)	$	(171.2	)

XML

Label	Element	Value
Equity Method Investment, Aggregate Cost	us-gaap_EquityMethodInvestmentAggregateCost	$ 9.5
Guarantor Subsidiaries [Member]
Equity Method Investment, Aggregate Cost	us-gaap_EquityMethodInvestmentAggregateCost	0.8
Chaspark Maritime Holdings Ltd [Member]
Equity Method Investment, Aggregate Cost	us-gaap_EquityMethodInvestmentAggregateCost	$ 8.7

XML

Segment Reporting - Narrative (Details)	6 Months Ended
	Jun. 30, 2015 Segment
Segment Reporting [Abstract]
Number of business segments	2

XML

Share-Based Payments

6 Months Ended

Jun. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Payments

Share-Based Payments

The Company has issued options and other equity incentives under three arrangements: the employee incentive plans, the non-employee director plan and the employee share purchase plans. When options are exercised or other equity awards have vested, new shares are issued as the Company does not currently hold treasury shares.

Employee and Non-Employee Director Awards. Employee options and other awards were granted under the Aspen 2003 Share Incentive Plan, as amended (the “2003 Share Incentive Plan”), prior to April 24, 2013 and thereafter under the 2013 Share Incentive Plan (the “2013 Share Incentive Plan”). The total number of ordinary shares that may be issued under the 2013 Share Incentive Plan is 2,845,683 ordinary shares, which includes 595,683 ordinary shares available to grant under the 2003 Share Incentive Plan as of February 25, 2013. The number of ordinary shares that may be issued under the 2013 Share Incentive Plan is adjusted per the number of awards that may be forfeited under the 2003 Share Incentive Plan. The non-employee director awards are granted under the 2006 Stock Option Plan for Non-Employee Directors.

Stock options were granted with an exercise price equivalent to the fair value of the share on the grant date. The weighted average value at grant date is determined using the Black-Scholes option pricing model. Stock options typically vest over a three-year period with a ten-year exercise period (except for options granted in 2007 which had a seven-year exercise period) with vesting dependent on time and performance conditions established at the time of grant. No options were granted during the three and six months ended June 30, 2015 (2014 — Nil and Nil) and Nil and 83,938 options, respectively, were exercised and shares issued in the three and six months ended June 30, 2015 (2014 — 33,587 and 53,436 options). No charges against income were made in respect of employee options for the three and six months ended June 30, 2015 (2014 — $Nil and $Nil).

Restricted share units (“RSUs”) granted to employees typically vest over a three-year period based on continued service. Some of the RSU grants vest at year-end, while others vest on the anniversary of the date of grant or when the Compensation Committee of the Board of Directors agrees to deliver the RSUs. The fair value of the RSUs is based on the closing price on the date of the grant adjusted for illiquidity and is expensed through the income statement evenly over the vesting period. In the three and six months ended June 30, 2015, the Company granted to its employees 3,837 and 242,152 RSUs, respectively (2014 — 259,640 and 259,640). Compensation costs charged against income in respect of RSUs for the three and six months ended June 30, 2015 were $1.5 million and $3.1 million, respectively (2014 — $3.0 million and $5.8 million).

In the case of non-employee directors, generally one-twelfth of the RSUs vest on each one month anniversary of the date of grant, with 100% of the RSUs vesting on the first anniversary of the date of grant. On February 5, 2015 (with a grant date of February 9, 2015), the Board of Directors approved a total of 27,620 RSUs for the non-employee directors (2014 — 27,180 RSUs) and 12,154 RSUs to the Chairman (February 10, 2014 — 13,590 RSUs). Compensation costs charged against income in respect of non-employee director RSUs for the three and six months ended June 30, 2015 were $0.4 million and $0.7 million, respectively (2014 — $0.4 million and $0.8 million).

The total fair value adjustment for all RSUs for the three and six months ended June 30, 2015 was $Nil and $0.3 million, respectively (2014 — $0.6 million and $1.2 million). The total tax credit recognized by the Company in relation to RSUs in the three and six months ended June 30, 2015 was $0.3 million and $0.7 million, respectively (2014 — $0.7 million and $1.3 million).

Performance Shares. During the three and six months ended June 30, 2015, the Company granted Nil and 277,585 performance shares, respectively, to employees (2014 — 315,389 and 315,389). The performance shares will be subject to a three-year vesting period with a separate annual diluted book value per share (“BVPS”) growth test for each year, adjusted to add back ordinary dividends. One-third of the grant will be eligible for vesting each year based on a formula, and will only be issuable at the end of the three-year period.

If the diluted BVPS growth achieved in 2015 is:

• less than 5.6%, then the portion of the performance shares subject to the vesting conditions in such year will be forfeited (i.e., one-third of the initial grant);

• between 5.6% and 11.1%, then the percentage of the performance shares eligible for vesting in such year will be between 10% and 100% on a straight-line basis; or

• between 11.1% and 22.2%, then the percentage of the performance shares eligible for vesting in such year will be between 100% and 200% on a straight-line basis.

In calculating BVPS for 2015, the entire movement in AOCI will be excluded. Interest rate movements and credit spread movements in AOCI can be fairly significant and impact growth in BVPS which management does not have any control over. The Compensation Committee will review the impact of any capital management actions undertaken during 2015, including share repurchases and special dividends, and consider whether any further adjustments to growth in BVPS should be made in the context of such actions. The calculation of BVPS for 2015 will exclude all transactional expenses incurred in connection with any transaction which, if consummated, would result in a change in control, including without limitation the cost of defending against any such transaction and any third-party legal and advisory costs. The Compensation Committee believes that it would not be appropriate for employees’ performance-related compensation to be impacted by these costs.

The Compensation Committee will determine the vesting conditions for the 2016 and 2017 portions of the grant in such years taking into consideration the market conditions and the Company’s business plans at the commencement of the years concerned. Notwithstanding the vesting criteria for each given year, if the shares eligible for vesting in 2016 and 2017 are greater than 100% for the portion of such year’s grant and the average diluted BVPS growth over such year and the preceding year is less than the average of the minimum vesting thresholds for such year and the preceding year, then only 100% (and no more) of the ordinary shares that are eligible for vesting in such year shall vest. Notwithstanding the foregoing, if in the judgment of the Compensation Committee the main reason for the BVPS metric in the earlier year falling below the minimum threshold is due to the impact of rising interest rates and bond yields, then the Compensation Committee may, in its discretion, disapply this limitation on 100% vesting. 

The fair value of performance share awards is based on the value of the closing share price on the date of the grant adjusted for illiquidity less a deduction for expected dividends which would not accrue during the vesting period. Compensation costs charged against income in the three and six months ended June 30, 2015 in respect of performance shares were $2.0 million and $2.2 million, respectively (2014 — $2.8 million and $4.2 million). The total tax recognized by the Company in relation to performance shares in the three and six months ended June 30, 2015 was a tax credit of $0.4 million and $0.5 million, respectively (2014 — $1.9 million and $3.7 million).

Phantom Shares. During the three and six months ended June 30, 2015, the Compensation Committee approved the grant of Nil and 135,651 phantom shares, respectively, to its employees (2014 — 154,512 and 154,512). The phantom shares are subject to a three-year vesting period with a separate annual diluted BVPS growth test for each year, in accordance with the test described above for the 2015 performance shares, with the difference being that any vested amount would be paid in cash in lieu of ordinary shares. As ordinary shares are not issued, the phantom shares have no dilutive effect. 

The fair value of the phantom shares is based on the closing share price on the date of the grant adjusted for illiquidity, less estimated dividends payable over the vesting period. The fair value is expensed through the consolidated income statement evenly over the vesting period, but as the payment to beneficiaries will ultimately be in cash rather than ordinary shares, an adjustment is required each quarter to revalue the accumulated liability to the balance sheet date fair value. Compensation costs charged against income in the three and six months ended June 30, 2015 in respect of phantom shares were $1.1 million and $2.0 million, respectively (2014 — $0.8 million and $2.4 million) with a fair value adjustment for the three and six months ended June 30, 2015 of $0.9 million and $2.0 million, respectively (2014 — $0.3 million and $0.5 million). The total tax credit recognized by the Company in relation to phantom shares in the three and six months ended June 30, 2015 was $0.3 million and $0.7 million, respectively (2014 — $0.3 million and $0.5 million).

Employee Share Purchase Plans. On April 30, 2008, the shareholders of the Company approved the Employee Share Purchase Plan, the 2008 Sharesave Scheme and the International Employee Share Purchase Plan (collectively, the “ESPP”), which are implemented by a series of consecutive offering periods as determined by the Board of Directors. In respect of the Employee Share Purchase Plan, employees can save up to $500 per month over a two-year period, at the end of which they will be eligible to purchase the Company’s ordinary shares at a discounted price, subject to a further one year holding period. In respect of the 2008 Sharesave Scheme, employees can save up to £250 per month over a three-year period (and effective April 6, 2014, £500 per month), at the end of which they will be eligible to purchase the Company’s ordinary shares at a discounted price. The purchase price will be eighty-five percent (85%) of the fair market value of an ordinary share on the offering date which may be adjusted upon changes in capitalization of the Company. Under the ESPP, 2,224 and 54,676 ordinary shares, respectively, were exercised and issued during the three and six months ended June 30, 2015 (2014 — 1,200 and 11,194 shares). Compensation costs charged against income in the three and six months ended June 30, 2015 in respect of the ESPP were $0.1 million and $0.2 million, respectively (2014 — $Nil and $0.1 million).