10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

ý Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended June 30, 2018

or

¨ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from to

Commission File Number: 1-9518

THE PROGRESSIVE CORPORATION

(Exact name of registrant as specified in its charter)

Ohio	34-0963169
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
6300 Wilson Mills Road, Mayfield Village, Ohio	44143
(Address of principal executive offices)	(Zip Code)

(440) 461-5000

(Registrant’s telephone number, including area code)

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 period 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, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

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

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

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.

Common Shares, $1.00 par value: 582,512,182 outstanding at June 30, 2018

1

PART I—FINANCIAL INFORMATION

Item 1. Financial Statements.

The Progressive Corporation and Subsidiaries

Consolidated Statements of Comprehensive Income

(unaudited)

	Three Months							Six Months
Periods Ended June 30,	2018			2017			% Change	2018			2017			% Change
(millions — except per share amounts)
Revenues
Net premiums earned	$	7,634.2		$	6,313.3		21	$	14,808.2		$	12,340.0		20
Investment income	192.1			138.8			38	358.4			268.0			34
Net realized gains (losses) on securities:
Net realized gains (losses) on security sales	(9.6		)	45.5			(121)	97.4			97.6			0
Net holding period gains (losses) on securities	53.5			0.4			NM	(101.7		)	1.2			NM
Net impairment losses recognized in earnings	(11.1		)	(13.8		)	(20)	(11.1		)	(14.8		)	(25)
Total net realized gains (losses) on securities	32.8			32.1			2	(15.4		)	84.0			(118)
Fees and other revenues	116.0			88.8			31	219.8			174.0			26
Service revenues	42.9			32.7			31	77.1			61.2			26
Other gains (losses)	0			0			NM	0			0.2			(100)
Total revenues	8,018.0			6,605.7			21	15,448.1			12,927.4			19
Expenses
Losses and loss adjustment expenses	5,375.3			4,614.9			16	10,246.1			8,878.3			15
Policy acquisition costs	630.8			514.2			23	1,227.0			1,017.1			21
Other underwriting expenses	1,046.9			845.0			24	2,027.1			1,690.6			20
Investment expenses	6.2			6.6			(6)	12.2			12.2			0
Service expenses	37.0			27.0			37	66.3			52.9			25
Interest expense	41.7			43.4			(4)	78.5			80.2			(2)
Total expenses	7,137.9			6,051.1			18	13,657.2			11,731.3			16
Net Income
Income before income taxes	880.1			554.6			59	1,790.9			1,196.1			50
Provision for income taxes	178.9			181.9			(2)	359.9			393.1			(8)
Net income	701.2			372.7			88	1,431.0			803.0			78
Net (income) loss attributable to noncontrolling interest (NCI)	3.0			(5.1		)	(159)	(8.8		)	(11.1		)	(21)
Net income attributable to Progressive	$	704.2		$	367.6		92	$	1,422.2		$	791.9		80
Other Comprehensive Income (Loss)
Changes in:
Total net unrealized gains (losses) on securities	$	(50.1	)	$	92.6		(154)	$	(204.6	)	$	225.0		(191)
Net unrealized losses on forecasted transactions	0.2			(8.0		)	(103)	0.4			(5.7		)	(107)
Foreign currency translation adjustment	0			(0.1		)	(100)	0			0.2			(100)
Other comprehensive income (loss)	(49.9		)	84.5			(159)	(204.2		)	219.5			(193)
Other comprehensive (income) loss attributable to NCI	0.6			(1.3		)	(146)	4.6			(2.2		)	(309)
Comprehensive income attributable to Progressive	$	654.9		$	450.8		45	$	1,222.6		$	1,009.2		21
Computation of Per Share Earnings Available to Progressive Common Shareholders
Net income attributable to Progressive	$	704.2		$	367.6		92	$	1,422.2		$	791.9		80
Less: Preferred share dividends	6.7			0			NM	7.9			0			NM
Net income available to common shareholders	$	697.5		$	367.6		90	$	1,414.3		$	791.9		79
Average common shares outstanding - Basic	582.0			580.5			0	582.0			580.4			0
Net effect of dilutive stock-based compensation	3.8			3.3			15	3.6			3.1			16
Total average equivalent common shares - Diluted	585.8			583.8			0	585.6			583.5			0
Basic: Earnings per common share	$	1.20		$	0.63		89	$	2.43		$	1.36		78
Diluted: Earnings per common share	$	1.19		$	0.63		89	$	2.42		$	1.36		78
Dividends declared per common share1	$	0		$	0			$	0		$	0

NM = Not Meaningful

¹ Progressive maintains an annual variable common share dividend program. See Note 9 – Dividends for further discussion.

See notes to consolidated financial statements.

2

The Progressive Corporation and Subsidiaries

Consolidated Balance Sheets

(unaudited)

	June 30,						December 31, 2017
(millions)	2018			2017
Assets
Available-for-sale securities, at fair value:
Fixed maturities (amortized cost: $24,061.8, $18,311.7, and $20,209.9)	$	23,789.2		$	18,388.1		$	20,201.7
Short-term investments (amortized cost: $3,231.2, $3,729.7, and $2,869.4)	3,231.2			3,729.7			2,869.4
Total available-for-sale securities	27,020.4			22,117.8			23,071.1
Equity securities, at fair value:
Nonredeemable preferred stocks (cost: $677.0, $666.0, and $698.6)	758.6			783.1			803.8
Common equities (cost: $1,314.0, $1,472.3, and $1,499.0)	3,142.2			3,077.5			3,399.8
Total equity securities	3,900.8			3,860.6			4,203.6
Total investments	30,921.2			25,978.4			27,274.7
Cash and cash equivalents	154.8			161.0			265.0
Restricted cash	2.9			0.8			10.3
Total cash, cash equivalents, and restricted cash	157.7			161.8			275.3
Accrued investment income	146.3			112.1			119.7
Premiums receivable, net of allowance for doubtful accounts of $210.5, $175.8, and $210.9	6,230.2			5,091.3			5,422.5
Reinsurance recoverables, including $117.6, $79.2, and $103.3 on paid losses and loss adjustment expenses	2,410.7			2,027.1			2,273.4
Prepaid reinsurance premiums	289.8			212.6			203.3
Deferred acquisition costs	895.7			727.2			780.5
Property and equipment, net of accumulated depreciation of $984.7, $894.7, and $940.6	1,116.4			1,152.1			1,119.6
Goodwill	452.7			452.7			452.7
Intangible assets, net of accumulated amortization of $211.7, $140.5, and $175.7	330.6			401.8			366.6
Other assets	412.2			372.7			412.9
Total assets	$	43,363.5		$	36,689.8		$	38,701.2
Liabilities
Unearned premiums	$	10,245.9		$	8,407.7		$	8,903.5
Loss and loss adjustment expense reserves	14,070.8			12,060.4			13,086.9
Net deferred income taxes	46.0			191.8			135.0
Accounts payable, accrued expenses, and other liabilities	3,922.3			3,153.2			3,481.0
Debt1	3,859.5			3,383.4			3,306.3
Total liabilities	32,144.5			27,196.5			28,912.7
Redeemable noncontrolling interest (NCI)2	218.2			501.8			503.7
Shareholders’ Equity
Serial Preferred Shares (authorized 20.0)
Serial Preferred Shares, Series B, no par value (cumulative, liquidation preference $1,000 per share) (authorized, issued, and outstanding 0.5, 0, and 0)	493.9			0			0
Common shares, $1.00 par value (authorized 900.0; issued 797.5, including treasury shares of 215.0, 216.5, and 215.8)	582.5			581.0			581.7
Paid-in capital	1,425.9			1,351.0			1,389.2
Retained earnings	8,720.4			5,908.8			6,031.7
Accumulated other comprehensive income:
Net unrealized gains (losses) on securities	(210.9		)	1,164.6			1,295.0
Net unrealized losses on forecasted transactions	(17.6		)	(15.1		)	(14.8		)
Foreign currency translation adjustment	0			(0.9		)	0
Accumulated other comprehensive (income) loss attributable to NCI	6.6			2.1			2.0
Total accumulated other comprehensive income attributable to Progressive	(221.9		)	1,150.7			1,282.2
Total shareholders’ equity	11,000.8			8,991.5			9,284.8
Total liabilities, redeemable NCI, and shareholders’ equity	$	43,363.5		$	36,689.8		$	38,701.2

¹ Consists of long-term debt. See Note 4 – Debt for further discussion.

² See Note 12 – Redeemable Noncontrolling Interest for further discussion.

See notes to consolidated financial statements.

3

The Progressive Corporation and Subsidiaries

Consolidated Statements of Changes in Shareholders’ Equity

(unaudited)

Six Months Ended June 30,
(millions — except per share amounts)	2018			2017
Serial Preferred Shares, No Par Value
Balance, Beginning of period	$	0		$	0
Issuance of Serial Preferred Shares, Series B	493.9			0
Balance, End of period	$	493.9		$	0
Common Shares, $1.00 Par Value
Balance, Beginning of period	$	581.7		$	579.9
Treasury shares purchased	(0.7		)	(0.7		)
Net restricted equity awards issued/vested	1.5			1.8
Balance, End of period	$	582.5		$	581.0
Paid-In Capital
Balance, Beginning of period	$	1,389.2		$	1,303.4
Treasury shares purchased	(1.7		)	(1.5		)
Net restricted equity awards issued/vested	(1.5		)	(1.8		)
Amortization of equity-based compensation	37.5			52.2
Reinvested dividends on restricted stock units	(0.8		)	0.1
Adjustment to carrying amount of redeemable noncontrolling interest	3.2			(1.4		)
Balance, End of period	$	1,425.9		$	1,351.0
Retained Earnings
Balance, Beginning of period	$	6,031.7		$	5,140.4
Net income attributable to Progressive	1,422.2			791.9
Treasury shares purchased	(37.0		)	(21.9		)
Reinvested dividends on restricted stock units	0.8			(0.1		)
Cumulative effect of change in accounting principle1	1,300.2			0
Reclassification of disproportionate tax effects1	4.3			0
Other, net	(1.8		)	(1.5		)
Balance, End of period	$	8,720.4		$	5,908.8
Accumulated Other Comprehensive Income Attributable to Progressive
Balance, Beginning of period	$	1,282.2		$	933.4
Attributable to noncontrolling interest	4.6			(2.2		)
Other comprehensive income	(204.2		)	219.5
Cumulative effect of change in accounting principle1	(1,300.2		)	0
Reclassification of disproportionate tax effects1	(4.3		)	0
Balance, End of period	$	(221.9	)	$	1,150.7
Total Shareholders’ Equity	$	11,000.8		$	8,991.5

¹ See Note 14 – New Accounting Standards for further discussion.

There are 5.0 million Voting Preference Shares authorized; no such shares have been issued.

See notes to consolidated financial statements.

4

The Progressive Corporation and Subsidiaries

Consolidated Statements of Cash Flows        

(unaudited) (millions)

Six Months Ended June 30,	2018			2017
Cash Flows From Operating Activities
Net income	$	1,431.0		$	803.0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	86.6			84.0
Amortization of intangible assets	36.0			31.0
Net amortization of fixed-income securities	23.2			44.1
Amortization of equity-based compensation	38.5			53.9
Net realized (gains) losses on securities	15.4			(84.0		)
Net (gains) losses on disposition of property and equipment	1.7			3.2
Other (gains) losses	0			(0.2		)
Changes in:
Premiums receivable	(807.7		)	(582.0		)
Reinsurance recoverables	(137.3		)	(142.4		)
Prepaid reinsurance premiums	(86.5		)	(42.1		)
Deferred acquisition costs	(115.2		)	(76.0		)
Income taxes	2.0			(64.3		)
Unearned premiums	1,342.4			939.0
Loss and loss adjustment expense reserves	983.9			692.3
Accounts payable, accrued expenses, and other liabilities	700.4			430.2
Other, net	(31.1		)	(67.1		)
Net cash provided by operating activities	3,483.3			2,022.6
Cash Flows From Investing Activities
Purchases:
Fixed maturities	(10,780.0		)	(6,803.3		)
Equity securities	(136.4		)	(89.5		)
Sales:
Fixed maturities	3,916.1			2,359.9
Equity securities	460.0			133.3
Maturities, paydowns, calls, and other:
Fixed maturities	2,936.2			2,413.5
Equity securities	15.0			50.0
Net sales (purchases) of short-term investments	(343.8		)	(146.8		)
Net unsettled security transactions	367.9			259.3
Purchases of property and equipment	(102.0		)	(73.2		)
Sales of property and equipment	6.7			12.5
Acquisition of additional shares of ARX Holding Corp.	(295.9		)	0
Acquisition of an insurance company, net of cash acquired	0			(18.1		)
Net cash used in investing activities	(3,956.2		)	(1,902.4		)
Cash Flows From Financing Activities
Net proceeds from issuance of Serial Preferred Shares, Series B	493.9			0
Net proceeds from debt issuance	589.5			841.1
Payments of debt	(37.1		)	(12.5		)
Redemption/reacquisition of subordinated debt	0			(594.4		)
Dividends paid to common shareholders	(654.9		)	(395.4		)
Proceeds from exercise of equity options	3.3			0.5
Acquisition of treasury shares for restricted stock tax liabilities	(39.0		)	(24.1		)
Acquisition of treasury shares acquired in open market	(0.4		)	0
Net cash provided by (used in) financing activities	355.3			(184.8		)
Decrease in cash, cash equivalents, and restricted cash	(117.6		)	(64.6		)
Cash, cash equivalents, and restricted cash – January 1	275.3			226.4
Cash, cash equivalents, and restricted cash – June 30	$	157.7		$	161.8

See notes to consolidated financial statements.

5

The Progressive Corporation and Subsidiaries

Notes to Consolidated Financial Statements

(unaudited)

Note 1Basis of Presentation — The accompanying consolidated financial statements include the accounts of The Progressive Corporation and ARX Holding Corp. (ARX), and their respective wholly owned insurance and non-insurance subsidiaries and affiliates in which Progressive or ARX has a controlling financial interest. The Progressive Corporation owned 86.7% of the outstanding capital stock of ARX at June 30, 2018 and 69.0% at June 30, 2017 and December 31, 2017. The increase in Progressive’s ownership of ARX at June 30, 2018, is due to the minority ARX shareholders who “put” 204,527 of their ARX shares during the second quarter 2018, including exercised stock options, to Progressive pursuant to the stockholders’ agreement. All intercompany accounts and transactions are eliminated in consolidation.

The consolidated financial statements reflect all normal recurring adjustments that, in the opinion of management, were necessary for a fair statement of the results for the interim periods presented. The results of operations for the period ended June 30, 2018, are not necessarily indicative of the results expected for the full year. These consolidated financial statements and the notes thereto should be read in conjunction with Progressive’s audited financial statements and accompanying notes included in Exhibit 13 to our Annual Report on Form 10-K for the year ended December 31, 2017 (“2017 Annual Report to Shareholders”).

Other assets on the consolidated balance sheets include properties that are considered “held for sale,” if any. The fair value of these properties, less the estimated cost to sell them, was $17.4 million at June 30, 2018 and $5.3 million at December 31, 2017. No properties were held for sale at June 30, 2017.

6

Note 2Investments — The following tables present the composition of our investment portfolio by major security type, consistent with our classification of how we manage, monitor, and measure the portfolio. Our securities are reported in our Consolidated Balance Sheets at fair value, with all of our equity securities having a readily determinable fair value. The changes in fair value for our fixed-maturity securities (other than hybrid securities) are reported as a component of accumulated other comprehensive income, net of deferred income taxes, in our Consolidated Balance Sheets.

The net holding period gains (losses) reported below represent the inception-to-date changes in fair value. The changes in the net holding period gains (losses) between periods for the hybrid securities and, beginning in 2018, equity securities are recorded as a component of net realized gains (losses) on securities in our Consolidated Statements of Comprehensive Income. Prior to 2018, the change in fair value of our equity securities was part of accumulated other comprehensive income (see Note 14 – New Accounting Standards for further discussion).

($ in millions)	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Net Holding Period Gains (Losses)			Fair Value		% of Total Fair Value
June 30, 2018
Available-for-sale securities:
Fixed maturities:
U.S. government obligations	$	8,005.8	$	0.9	$	(141.3	)	$	0		$	7,865.4	25.4	%
State and local government obligations	1,678.9		4.3		(15.9		)	0			1,667.3		5.4
Foreign government obligations	0		0		0			0			0		0
Corporate debt securities	7,422.4		4.2		(94.3		)	(2.0		)	7,330.3		23.7
Residential mortgage-backed securities	819.6		8.4		(5.4		)	0			822.6		2.7
Commercial mortgage-backed securities	2,725.5		2.9		(31.5		)	0			2,696.9		8.7
Other asset-backed securities	3,189.2		2.0		(13.7		)	0.1			3,177.6		10.3
Redeemable preferred stocks	220.4		14.1		(2.0		)	(3.4		)	229.1		0.7
Total fixed maturities	24,061.8		36.8		(304.1		)	(5.3		)	23,789.2		76.9
Short-term investments	3,231.2		0		0			0			3,231.2		10.5
Total available-for-sale securities	27,293.0		36.8		(304.1		)	(5.3		)	27,020.4		87.4
Equity securities:
Nonredeemable preferred stocks	677.0		0		0			81.6			758.6		2.4
Common equities	1,314.0		0		0			1,828.2			3,142.2		10.2
Total equity securities	1,991.0		0		0			1,909.8			3,900.8		12.6
Total portfolio1,2	$	29,284.0	$	36.8	$	(304.1	)	$	1,904.5		$	30,921.2	100.0	%

7

($ in millions)	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Net Holding Period Gains (Losses)		Fair Value		% of Total Fair Value
June 30, 2017
Fixed maturities:
U.S. government obligations	$	4,166.4	$	4.4	$	(15.8	)	$	0	$	4,155.0	16.0	%
State and local government obligations	2,473.3		32.5		(5.9		)	0.2		2,500.1		9.7
Foreign government obligations	22.5		0		0			0		22.5		0.1
Corporate debt securities	4,991.6		29.4		(7.6		)	0.4		5,013.8		19.3
Residential mortgage-backed securities	1,260.3		10.9		(5.9		)	2.3		1,267.6		4.8
Commercial mortgage-backed securities	2,364.9		19.8		(9.7		)	0		2,375.0		9.1
Other asset-backed securities	2,843.3		6.4		(2.5		)	0.2		2,847.4		11.0
Redeemable preferred stocks	189.4		19.0		(1.7		)	0		206.7		0.8
Total fixed maturities	18,311.7		122.4		(49.1		)	3.1		18,388.1		70.8
Equity securities:
Nonredeemable preferred stocks	666.0		123.6		(6.5		)	0		783.1		3.0
Common equities	1,472.3		1,611.7		(6.5		)	0		3,077.5		11.8
Short-term investments	3,729.7		0		0			0		3,729.7		14.4
Total portfolio1,2	$	24,179.7	$	1,857.7	$	(62.1	)	$	3.1	$	25,978.4	100.0	%

($ in millions)	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Net Holding Period Gains (Losses)			Fair Value		% of Total Fair Value
December 31, 2017
Fixed maturities:
U.S. government obligations	$	6,688.8	$	1.1	$	(44.0	)	$	0		$	6,645.9	24.4	%
State and local government obligations	2,285.6		20.7		(9.3		)	0.1			2,297.1		8.4
Foreign government obligations	0		0		0			0			0		0
Corporate debt securities	4,997.2		14.8		(14.4		)	0.1			4,997.7		18.3
Residential mortgage-backed securities	828.8		11.3		(3.4		)	0			836.7		3.1
Commercial mortgage-backed securities	2,760.1		11.8		(13.3		)	0			2,758.6		10.1
Other asset-backed securities	2,454.5		4.5		(4.5		)	0.2			2,454.7		9.0
Redeemable preferred stocks	194.9		17.8		(1.5		)	(0.2		)	211.0		0.8
Total fixed maturities	20,209.9		82.0		(90.4		)	0.2			20,201.7		74.1
Equity securities:
Nonredeemable preferred stocks	698.6		114.0		(8.8		)	0			803.8		2.9
Common equities	1,499.0		1,901.0		(0.2		)	0			3,399.8		12.5
Short-term investments	2,869.4		0		0			0			2,869.4		10.5
Total portfolio1,2	$	25,276.9	$	2,097.0	$	(99.4	)	$	0.2		$	27,274.7	100.0	%

¹Our portfolio reflects the effect of unsettled security transactions; at June 30, 2018 and 2017, we had $362.1 million and $287.1 million, respectively, included in “other liabilities,” compared to $5.8 million included in “other assets” at December 31, 2017.

²The total fair value of the portfolio at June 30, 2018 and 2017, and December 31, 2017, included $1.7 billion, $1.1 billion, and $1.6 billion, respectively, of securities held in a consolidated, non-insurance subsidiary of the holding company, net of any unsettled security transactions.

Short-Term Investments Our short-term investments may include commercial paper and other investments that are expected to mature or are redeemable within one year.

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We did not have any open repurchase or reverse repurchase transactions in our short-term investment portfolio at June 30, 2018 and 2017, or December 31, 2017. To the extent we enter into repurchase or reverse repurchase transactions, and consistent with past practice, we would elect not to offset these transactions and would report them on a gross basis on our balance sheets despite the option to elect to offset these transactions as long as they were with the same counterparty and subject to an enforceable master netting arrangement.

Hybrid Securities Included in our fixed-maturity securities are hybrid securities, which are reported at fair value:

	June 30,
(millions)	2018		2017		December 31, 2017
Fixed maturities:
State and local government obligations	$	3.6	$	6.6	$	6.1
Corporate debt securities	170.3		61.3		99.8
Residential mortgage-backed securities	0		189.7		0
Other asset-backed securities	5.5		7.7		6.7
Redeemable preferred stocks	67.3		0		30.3
Total hybrid securities	$	246.7	$	265.3	$	142.9

Certain securities in our portfolio are accounted for as hybrid securities because they contain embedded derivatives that are not deemed to be clearly and closely related to the host investments. Since the embedded derivative (e.g., change-in-control put option, debt-to-equity conversion, or any other feature unrelated to the credit quality or risk of default of the issuer that could impact the amount or timing of our expected future cash flows) does not have an observable intrinsic value, we have elected to record the change in fair value of the entire security through income as a realized gain or loss.

Fixed Maturities The composition of fixed maturities by maturity at June 30, 2018, was:

(millions)	Cost		Fair Value
Less than one year	$	3,805.2	$	3,809.2
One to five years	15,190.7		14,999.1
Five to ten years	4,939.7		4,855.4
Ten years or greater	126.2		125.5
Total	$	24,061.8	$	23,789.2

Asset-backed securities are classified in the maturity distribution table based upon their projected cash flows. All other securities which do not have a single maturity date are reported based upon expected average maturity. Contractual maturities may differ from expected maturities because the issuers of the securities may have the right to call or prepay obligations.

Gross Unrealized Losses As of June 30, 2018, we had $304.1 million of gross unrealized losses in our fixed-maturity securities. A review of our fixed-maturity securities indicated that the issuers were current with respect to their interest obligations and that there was no evidence of deterioration of the current cash flow projections that would indicate we would not receive the remaining principal at maturity.

9

The following tables show the composition of gross unrealized losses by major security type and by the length of time that individual securities have been in a continuous unrealized loss position:

	Total No. of Sec.	Total Fair Value		Gross Unrealized Losses			Less than 12 Months						12 Months or Greater
($ in millions)							No. of Sec.	Fair Value		Unrealized Losses			No. of Sec.	Fair Value		Unrealized Losses
June 30, 2018
Fixed maturities:
U.S. government obligations	70	$	7,503.2	$	(141.3	)	33	$	4,543.5	$	(73.6	)	37	$	2,959.7	$	(67.7	)
State and local government obligations	355	1,050.9		(15.9		)	219	631.9		(7.1		)	136	419.0		(8.8		)
Corporate debt securities	391	6,153.5		(94.3		)	322	5,439.3		(77.2		)	69	714.2		(17.1		)
Residential mortgage-backed securities	227	380.3		(5.4		)	52	188.6		(0.9		)	175	191.7		(4.5		)
Commercial mortgage-backed securities	142	2,300.9		(31.5		)	85	1,371.4		(14.4		)	57	929.5		(17.1		)
Other asset-backed securities	219	2,479.7		(13.7		)	148	2,055.1		(8.5		)	71	424.6		(5.2		)
Redeemable preferred stocks	3	30.2		(2.0		)	1	4.6		(0.2		)	2	25.6		(1.8		)
Total fixed maturities	1,407	$	19,898.7	$	(304.1	)	860	$	14,234.4	$	(181.9	)	547	$	5,664.3	$	(122.2	)

	Total No. of Sec.	Total Fair Value		Gross Unrealized Losses			Less than 12 Months						12 Months or Greater
($ in millions)							No. of Sec.	Fair Value		Unrealized Losses			No. of Sec.	Fair Value		Unrealized Losses
June 30, 2017
Fixed maturities:
U.S. government obligations	41	$	2,781.8	$	(15.8	)	39	$	2,725.1	$	(15.1	)	2	$	56.7	$	(0.7	)
State and local government obligations	222	818.7		(5.9		)	138	479.8		(3.3		)	84	338.9		(2.6		)
Corporate debt securities	143	1,905.2		(7.6		)	122	1,599.6		(5.3		)	21	305.6		(2.3		)
Residential mortgage-backed securities	220	535.7		(5.9		)	126	197.8		(1.1		)	94	337.9		(4.8		)
Commercial mortgage-backed securities	74	905.6		(9.7		)	52	679.5		(5.7		)	22	226.1		(4.0		)
Other asset-backed securities	160	2,077.8		(2.5		)	145	1,823.8		(1.9		)	15	254.0		(0.6		)
Redeemable preferred stocks	1	10.8		(1.7		)	0	0		0			1	10.8		(1.7		)
Total fixed maturities	861	9,035.6		(49.1		)	622	7,505.6		(32.4		)	239	1,530.0		(16.7		)
Equity securities:
Nonredeemable preferred stocks	3	73.1		(6.5		)	0	0		0			3	73.1		(6.5		)
Common equities	80	73.1		(6.5		)	74	72.3		(6.5		)	6	0.8		0
Total equity securities	83	146.2		(13.0		)	74	72.3		(6.5		)	9	73.9		(6.5		)
Total portfolio	944	$	9,181.8	$	(62.1	)	696	$	7,577.9	$	(38.9	)	248	$	1,603.9	$	(23.2	)

	Total No. of Sec.	Total Fair Value		Gross Unrealized Losses			Less than 12 Months						12 Months or Greater
($ in millions)							No. of Sec.	Fair Value		Unrealized Losses			No. of Sec.	Fair Value		Unrealized Losses
December 31, 2017
Fixed maturities:
U.S. government obligations	58	$	5,817.0	$	(44.0	)	41	$	4,869.3	$	(34.6	)	17	$	947.7	$	(9.4	)
State and local government obligations	358	1,200.3		(9.3		)	230	737.6		(4.4		)	128	462.7		(4.9		)
Corporate debt securities	222	2,979.4		(14.4		)	171	2,072.9		(9.1		)	51	906.5		(5.3		)
Residential mortgage-backed securities	201	300.9		(3.4		)	30	75.1		(0.2		)	171	225.8		(3.2		)
Commercial mortgage-backed securities	105	1,682.3		(13.3		)	63	1,221.2		(5.9		)	42	461.1		(7.4		)
Other asset-backed securities	197	1,837.3		(4.5		)	134	1,377.8		(3.3		)	63	459.5		(1.2		)
Redeemable preferred stocks	2	21.8		(1.5		)	1	10.8		(0.1		)	1	11.0		(1.4		)
Total fixed maturities	1,143	13,839.0		(90.4		)	670	10,364.7		(57.6		)	473	3,474.3		(32.8		)
Equity securities:
Nonredeemable preferred stocks	4	127.8		(8.8		)	1	56.5		(0.5		)	3	71.3		(8.3		)
Common equities	19	13.4		(0.2		)	18	13.4		(0.2		)	1	0		0
Total equity securities	23	141.2		(9.0		)	19	69.9		(0.7		)	4	71.3		(8.3		)
Total portfolio	1,166	$	13,980.2	$	(99.4	)	689	$	10,434.6	$	(58.3	)	477	$	3,545.6	$	(41.1	)

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Since both June 30, 2017 and December 31, 2017, the number of securities in our fixed-maturity portfolio with unrealized losses increased, primarily the result of rising interest rates during the latter part of 2017 and early 2018. We had no material decreases in valuation as a result of credit rating downgrades and all of the securities in the table above are current with respect to required principal and interest payments.

Other-Than-Temporary Impairment (OTTI) The following table shows the total non-credit portion of the OTTI recorded in accumulated other comprehensive income, reflecting the original non-credit loss at the time the credit impairment was determined (i.e., unadjusted for valuation changes subsequent to the original write-down):

	June 30,						December 31, 2017
(millions)	2018			2017
Fixed maturities:
Residential mortgage-backed securities	$	(19.7	)	$	(19.7	)	$	(19.7	)
Commercial mortgage-backed securities	(0.3		)	(0.5		)	(0.3		)
Total fixed maturities	$	(20.0	)	$	(20.2	)	$	(20.0	)

The following tables provide rollforwards of the amounts related to credit losses recognized in earnings for the periods ended June 30, 2018 and 2017, for which a portion of the OTTI losses were also recognized in accumulated other comprehensive income at the time the credit impairments were determined and recognized:

	Three Months Ended June 30, 2018
	Mortgage-Backed
(millions)	Residential		Commercial		Total
Balance at March 31, 2018	$	0	$	0.5	$	0.5
Reductions for securities sold/matured	0		0		0
Change in recoveries of future cash flows expected to be collected1	0.3		0		0.3
Balance at June 30, 2018	$	0.3	$	0.5	$	0.8
	Six Months Ended June 30, 2018
	Mortgage-Backed
(millions)	Residential		Commercial		Total
Balance at December 31, 2017	$	0	$	0.5	$	0.5
Reductions for securities sold/matured	0		0		0
Change in recoveries of future cash flows expected to be collected1	0.3		0		0.3
Balance at June 30, 2018	$	0.3	$	0.5	$	0.8

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	Three Months Ended June 30, 2017
	Mortgage-Backed
(millions)	Residential			Commercial			Total
Balance at March 31, 2017	$	11.4		$	0.1		$	11.5
Reductions for securities sold/matured	(11.4		)	0			(11.4		)
Change in recoveries of future cash flows expected to be collected1	0.2			0			0.2
Balance at June 30, 2017	$	0.2		$	0.1		$	0.3
	Six Months Ended June 30, 2017
	Mortgage-Backed
(millions)	Residential			Commercial			Total
Balance at December 31, 2016	$	11.1		$	0.4		$	11.5
Reductions for securities sold/matured	(10.9		)	(0.3		)	(11.2		)
Change in recoveries of future cash flows expected to be collected1	0			0			0
Balance at June 30, 2017	$	0.2		$	0.1		$	0.3

¹Reflects the current period change in the expected recovery of prior impairments that will be accreted into income over the remaining life of the security.

Although we determined it is more likely that we will not be required to sell the securities prior to the recovery of their respective cost bases (which could be maturity), we are required to measure the amount of potential credit losses on the securities that were in an unrealized loss position. In that process, we considered a number of factors and inputs related to the individual securities. The methodology and significant inputs used to measure the amount of credit losses in our portfolio included: current performance indicators on the business model or underlying assets (e.g., delinquency rates, foreclosure rates, and default rates); credit support (via current levels of subordination); historical credit ratings; and updated cash flow expectations based upon these performance indicators. In order to determine the amount of credit loss, if any, the net present value of the cash flows expected (i.e., expected recovery value) was calculated using the current book yield for each security, and was compared to its current amortized value. In the event that the net present value was below the amortized value, a credit loss would be deemed to exist, and the security would be written down. We did not have any credit impairment write-downs for the six months ended June 30, 2018 or 2017.

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Realized Gains (Losses) The components of net realized gains (losses) for the three and six months ended June 30, were:

	Three Months						Six Months
(millions)	2018			2017			2018			2017
Gross realized gains on security sales
Available-for-sale securities:
U.S. government obligations	$	1.7		$	4.5		$	1.7		$	4.9
State and local government obligations	0.6			2.6			9.2			3.1
Corporate and other debt securities	0.3			7.3			0.4			11.4
Residential mortgage-backed securities	0			20.9			0			21.0
Commercial mortgage-backed securities	0.3			1.2			2.0			2.4
Other asset-backed securities	0.1			0			0.1			0.3
Redeemable preferred stocks	3.2			0			4.3			0.3
Total available-for-sale securities	6.2			36.5			17.7			43.4
Equity securities:
Nonredeemable preferred stocks	0			6.2			3.6			51.6
Common equities	18.5			9.9			138.4			17.3
Total equity securities	18.5			16.1			142.0			68.9
Subtotal gross realized gains on security sales	24.7			52.6			159.7			112.3
Gross realized losses on security sales
Available-for-sale securities:
U.S. government obligations	(29.9		)	(0.4		)	(38.8		)	(3.6		)
State and local government obligations	(0.6		)	0			(1.9		)	(0.1		)
Corporate and other debt securities	(1.0		)	(1.9		)	(4.1		)	(2.8		)
Residential mortgage-backed securities	0			(0.3		)	0			(0.3		)
Commercial mortgage-backed securities	0			(0.7		)	(6.3		)	(3.1		)
Other asset-backed securities	(0.9		)	0			(1.0		)	0
Total available-for-sale securities	(32.4		)	(3.3		)	(52.1		)	(9.9		)
Equity securities:
Nonredeemable preferred stocks	(1.9		)	(4.6		)	(2.3		)	(5.8		)
Common equities	0			0			(7.9		)	(0.1		)
Total equity securities	(1.9		)	(4.6		)	(10.2		)	(5.9		)
Subtotal gross realized losses on security sales	(34.3		)	(7.9		)	(62.3		)	(15.8		)
Net realized gains (losses) on security sales
Available-for-sale securities:
U.S. government obligations	(28.2		)	4.1			(37.1		)	1.3
State and local government obligations	0			2.6			7.3			3.0
Corporate and other debt securities	(0.7		)	5.4			(3.7		)	8.6
Residential mortgage-backed securities	0			20.6			0			20.7
Commercial mortgage-backed securities	0.3			0.5			(4.3		)	(0.7		)
Other asset-backed securities	(0.8		)	0			(0.9		)	0.3
Redeemable preferred stocks	3.2			0			4.3			0.3
Total available-for-sale securities	(26.2		)	33.2			(34.4		)	33.5
Equity securities:
Nonredeemable preferred stocks	(1.9		)	1.6			1.3			45.8
Common equities	18.5			9.9			130.5			17.2
Total equity securities	16.6			11.5			131.8			63.0
Litigation settlements and other gains (losses)	0			0.8			0			1.1
Subtotal net realized gains (losses) on security sales	(9.6		)	45.5			97.4			97.6
Net holding period gains (losses)
Hybrid securities	(2.3		)	0.4			(5.5		)	1.2
Equity securities	55.8			0			(96.2		)	0
Subtotal net holding period gains (losses)	53.5			0.4			(101.7		)	1.2
Other-than-temporary impairment losses
Equity securities:
Common equities	0			(2.6		)	0			(3.6		)
Subtotal investment other-than-temporary impairment losses	0			(2.6		)	0			(3.6		)
Other asset impairment	(11.1		)	(11.2		)	(11.1		)	(11.2		)
Subtotal other-than-temporary impairment losses	(11.1		)	(13.8		)	(11.1		)	(14.8		)
Total net realized gains (losses) on securities	$	32.8		$	32.1		$	(15.4	)	$	84.0

Gross realized gains were predominantly the result of sales in our indexed common stock portfolio in order to reduce the overall portfolio risk, while gross realized losses were predominantly in our available-for-sale securities and were the result of changes in credit spreads and interest rates. Also included are holding period change in valuation gains and losses on equity securities and hybrid securities, recoveries from litigation settlements related to investments, and write-downs for securities determined to be other-than-temporarily impaired. The other asset impairment relates to renewable energy investments, which

13

are reflected in “other assets” on the balance sheet, under which the future pretax cash flows are expected to be less than the carrying value of the assets.

The following table reflects our holding period realized gains (losses) on equity securities recognized for the three and six months ended June 30, 2018 for equity securities held at quarter end:

	Three Months		Six Months
(millions)	2018		2018
Total net gains (losses) recognized during the period on equity securities	$	72.4	$	35.6
Less: Net gains (losses) recognized on equity securities sold during the period	16.6		131.8
Net holding period gains (losses) recognized during the period on equity securities held at period end	$	55.8	$	(96.2	)

Note: Comparative disclosure for the prior year period is not meaningful.

Net Investment Income  The components of net investment income for the three and six months ended June 30, were:

	Three Months						Six Months
(millions)	2018			2017			2018			2017
Available-for-sale securities:
Fixed maturities:
U.S. government obligations	$	45.9		$	17.0		$	85.7		$	29.7
State and local government obligations	9.1			13.1			19.1			26.4
Foreign government obligations	0			0.1			0			0.2
Corporate debt securities	51.8			31.3			88.0			60.9
Residential mortgage-backed securities	6.6			10.3			13.5			19.9
Commercial mortgage-backed securities	20.2			18.3			41.4			37.1
Other asset-backed securities	16.1			11.8			29.7			21.7
Redeemable preferred stocks	2.9			2.9			5.5			6.3
Total fixed maturities	152.6			104.8			282.9			202.2
Short-term investments	14.9			8.8			25.0			15.8
Total available-for-sale securities	167.5			113.6			307.9			218.0
Equity securities:
Nonredeemable preferred stocks	10.4			10.6			21.3			22.1
Common equities	14.2			14.6			29.2			27.9
Total equity securities	24.6			25.2			50.5			50.0
Investment income	192.1			138.8			358.4			268.0
Investment expenses	(6.2		)	(6.6		)	(12.2		)	(12.2		)
Net investment income	$	185.9		$	132.2		$	346.2		$	255.8

The amount of investment income (interest and dividends) we recognize varies from year to year based on the average assets held during the year and the book yields of the securities in our portfolio. The increase in net investment income on a year-over-year basis for the three and six months ended June 30, 2018, was due to a combination of an increase in average assets and an increase in portfolio yields. The increase in average assets was due to strong underwriting growth and profitability, as well as the $600 million debt and $500 million preferred stock issuances in the first quarter of 2018. The increase in portfolio yields was a result of our decision to increase the portfolio duration from 2.3 years at the end of the second quarter 2017 to 2.6 years at the end of the second quarter 2018 and a general rise in interest rates.

Trading Securities At June 30, 2018 and 2017, and December 31, 2017, we did not hold any trading securities and did not have any net realized gains (losses) on trading securities for the three and six months ended June 30, 2018 and 2017.

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Derivative Instruments

At June 30, 2018 and 2017, and December 31, 2017, we had no open derivative positions. During March 2017, we entered into a forecasted debt issuance hedge, against a possible rise in interest rates, in conjunction with the $850 million of 4.125% Senior Notes due 2047 issued in April 2017. Upon issuance, we closed the hedge and recognized, as part of accumulated other comprehensive income, a pretax unrealized loss of $8.0 million in April 2017.

See Note 4 – Debt for further discussion.

Note 3Fair Value — We have categorized our financial instruments, based on the degree of subjectivity inherent in the method by which they are valued, into a fair value hierarchy of three levels, as follows:

• Level 1: Inputs are unadjusted quoted prices in active markets for identical instruments at the measurement date (e.g., U.S. government obligations, which are continually priced on a daily basis, active exchange-traded equity securities, and certain short-term securities).

• Level 2: Inputs (other than quoted prices included within Level 1) that are observable for the instrument either directly or indirectly (e.g., certain corporate and municipal bonds and certain preferred stocks). This includes: (i) quoted prices for similar instruments in active markets, (ii) quoted prices for identical or similar instruments in markets that are not active, (iii) inputs other than quoted prices that are observable for the instruments, and (iv) inputs that are derived principally from or corroborated by observable market data by correlation or other means.

• Level 3: Inputs that are unobservable. Unobservable inputs reflect our subjective evaluation about the assumptions market participants would use in pricing the financial instrument (e.g., certain structured securities and privately held investments).

Determining the fair value of the investment portfolio is the responsibility of management. As part of the responsibility, we evaluate whether a market is distressed or inactive in determining the fair value for our portfolio. We review certain market level inputs to evaluate whether sufficient activity, volume, and new issuances exist to create an active market. Based on this evaluation, we concluded that there was sufficient activity related to the sectors and securities for which we obtained valuations.

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The composition of the investment portfolio by major security type and our outstanding debt was:

	Fair Value
(millions)	Level 1		Level 2		Level 3		Total		Cost
June 30, 2018
Fixed maturities:
U.S. government obligations	$	7,865.4	$	0	$	0	$	7,865.4	$	8,005.8
State and local government obligations	0		1,667.3		0		1,667.3		1,678.9
Foreign government obligations	0		0		0		0		0
Corporate debt securities	0		7,330.3		0		7,330.3		7,422.4
Subtotal	7,865.4		8,997.6		0		16,863.0		17,107.1
Asset-backed securities:
Residential mortgage-backed	0		822.6		0		822.6		819.6
Commercial mortgage-backed	0		2,696.9		0		2,696.9		2,725.5
Other asset-backed	0		3,177.6		0		3,177.6		3,189.2
Subtotal asset-backed securities	0		6,697.1		0		6,697.1		6,734.3
Redeemable preferred stocks:
Financials	0		67.7		0		67.7		65.3
Utilities	0		4.6		0		4.6		4.8
Industrials	10.1		146.7		0		156.8		150.3
Subtotal redeemable preferred stocks	10.1		219.0		0		229.1		220.4
Total fixed maturities	7,875.5		15,913.7		0		23,789.2		24,061.8
Short-term investments	2,954.2		277.0		0		3,231.2		3,231.2
Total available-for-sale securities	10,829.7		16,190.7		0		27,020.4		27,293.0
Equity securities:
Nonredeemable preferred stocks:
Financials	77.4		676.2		0		753.6		672.0
Industrials	0		0		5.0		5.0		5.0
Subtotal nonredeemable preferred stocks	77.4		676.2		5.0		758.6		677.0
Common equities:
Common stocks	3,141.9		0		0		3,141.9		1,313.7
Other risk investments	0		0		0.3		0.3		0.3
Subtotal common equities	3,141.9		0		0.3		3,142.2		1,314.0
Total equity securities	3,219.3		676.2		5.3		3,900.8		1,991.0
Total portfolio	$	14,049.0	$	16,866.9	$	5.3	$	30,921.2	$	29,284.0
Debt	$	0	$	3,959.0	$	0	$	3,959.0	$	3,859.5

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	Fair Value
(millions)	Level 1		Level 2		Level 3		Total		Cost
June 30, 2017
Fixed maturities:
U.S. government obligations	$	4,155.0	$	0	$	0	$	4,155.0	$	4,166.4
State and local government obligations	0		2,500.1		0		2,500.1		2,473.3
Foreign government obligations	22.5		0		0		22.5		22.5
Corporate debt securities	0		5,013.8		0		5,013.8		4,991.6
Subtotal	4,177.5		7,513.9		0		11,691.4		11,653.8
Asset-backed securities:
Residential mortgage-backed	0		1,267.6		0		1,267.6		1,260.3
Commercial mortgage-backed	0		2,375.0		0		2,375.0		2,364.9
Other asset-backed	0		2,847.4		0		2,847.4		2,843.3
Subtotal asset-backed securities	0		6,490.0		0		6,490.0		6,468.5
Redeemable preferred stocks:
Financials	0		64.1		0		64.1		60.4
Utilities	0		32.2		0		32.2		30.5
Industrials	0		110.4		0		110.4		98.5
Subtotal redeemable preferred stocks	0		206.7		0		206.7		189.4
Total fixed maturities	4,177.5		14,210.6		0		18,388.1		18,311.7
Equity securities:
Nonredeemable preferred stocks:
Financials	85.3		697.8		0		783.1		666.0
Industrials	0		0		0		0		0
Subtotal nonredeemable preferred stocks	85.3		697.8		0		783.1		666.0
Common equities:
Common stocks	3,077.2		0		0		3,077.2		1,472.0
Other risk investments	0		0		0.3		0.3		0.3
Subtotal common equities	3,077.2		0		0.3		3,077.5		1,472.3
Total fixed maturities and equity securities	7,340.0		14,908.4		0.3		22,248.7		20,450.0
Short-term investments	2,448.0		1,281.7		0		3,729.7		3,729.7
Total portfolio	$	9,788.0	$	16,190.1	$	0.3	$	25,978.4	$	24,179.7
Debt	$	0	$	3,564.4	$	114.8	$	3,679.2	$	3,383.4

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	Fair Value
(millions)	Level 1		Level 2		Level 3		Total		Cost
December 31, 2017
Fixed maturities:
U.S. government obligations	$	6,645.9	$	0	$	0	$	6,645.9	$	6,688.8
State and local government obligations	0		2,297.1		0		2,297.1		2,285.6
Foreign government obligations	0		0		0		0		0
Corporate debt securities	0		4,997.7		0		4,997.7		4,997.2
Subtotal	6,645.9		7,294.8		0		13,940.7		13,971.6
Asset-backed securities:
Residential mortgage-backed	0		836.7		0		836.7		828.8
Commercial mortgage-backed	0		2,758.6		0		2,758.6		2,760.1
Other asset-backed	0		2,454.7		0		2,454.7		2,454.5
Subtotal asset-backed securities	0		6,050.0		0		6,050.0		6,043.4
Redeemable preferred stocks:
Financials	0		64.1		0		64.1		61.3
Utilities	0		11.4		0		11.4		10.1
Industrials	0		135.5		0		135.5		123.5
Subtotal redeemable preferred stocks	0		211.0		0		211.0		194.9
Total fixed maturities	6,645.9		13,555.8		0		20,201.7		20,209.9
Equity securities:
Nonredeemable preferred stocks:
Financials	80.6		718.2		0		798.8		693.6
Industrials	0		0		5.0		5.0		5.0
Subtotal nonredeemable preferred stocks	80.6		718.2		5.0		803.8		698.6
Common equities:
Common stocks	3,399.5		0		0		3,399.5		1,498.7
Other risk investments	0		0		0.3		0.3		0.3
Subtotal common equities	3,399.5		0		0.3		3,399.8		1,499.0
Total fixed maturities and equity securities	10,126.0		14,274.0		5.3		24,405.3		22,407.5
Short-term investments	1,824.4		1,045.0		0		2,869.4		2,869.4
Total portfolio	$	11,950.4	$	15,319.0	$	5.3	$	27,274.7	$	25,276.9
Debt	$	0	$	3,606.5	$	37.1	$	3,643.6	$	3,306.3

Our portfolio valuations, excluding short-term investments, classified as either Level 1 or Level 2 in the above tables are priced exclusively by external sources, including: pricing vendors, dealers/market makers, and exchange-quoted prices. We did not have any transfers between Level 1 and Level 2 during 2018 or 2017.

Our short-term security holdings classified as Level 1 are highly liquid, actively marketed, and have a very short duration, primarily 90 days or less to redemption. These securities are held at their original cost, adjusted for any accretion of discount, since that value very closely approximates what an active market participant would be willing to pay for such securities. The remainder of our short-term securities are classified as Level 2 and are not priced externally since these securities continually trade at par value. These securities are classified as Level 2 since they are primarily longer-dated securities issued by municipalities that contain either liquidity facilities or mandatory put features within one year.

At June 30, 2018, vendor-quoted prices represented 72% of our Level 1 classifications (excluding short-term investments), compared to 58% and 66% at June 30, 2017 and December 31, 2017, respectively. The securities quoted by vendors in Level 1 primarily represent our holdings in U.S. Treasury Notes, which are frequently traded, and the quotes are considered similar to exchange-traded quotes. The balance of our Level 1 pricing comes from quotes obtained directly from trades made on active exchanges.

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At June 30, 2018 and 2017, and December 31, 2017, vendor-quoted prices comprised 98%, 99%, and 98%, respectively, of our Level 2 classifications (excluding short-term investments), while dealer-quoted prices represented 2%, 1%, and 2%, respectively. In our process for selecting a source (e.g., dealer, pricing service) to provide pricing for securities in our portfolio, we reviewed documentation from the sources that detailed the pricing techniques and methodologies used by these sources and determined if their policies adequately considered market activity, either based on specific transactions for the particular security type or based on modeling of securities with similar credit quality, duration, yield, and structure that were recently transacted. Once a source is chosen, we continue to monitor any changes or modifications to their processes by reviewing their documentation on internal controls for pricing and market reviews. We review quality control measures of our sources as they become available to determine if any significant changes have occurred from period to period that might indicate issues or concerns regarding their evaluation or market coverage.

As part of our pricing procedures, we obtain quotes from more than one source to help us fully evaluate the market price of securities. However, our internal pricing policy is to use a consistent source for individual securities in order to maintain the integrity of our valuation process. Quotes obtained from the sources are not considered binding offers to transact. Under our policy, when a review of the valuation received from our selected source appears to be outside of what is considered market level activity (which is defined as trading at spreads or yields significantly different than those of comparable securities or outside the general sector level movement without a reasonable explanation), we may use an alternate source’s price. To the extent we determine that it may be prudent to substitute one source’s price for another, we will contact the initial source to obtain an understanding of the factors that may be contributing to the significant price variance, which often leads the source to adjust their pricing input data for future pricing.

To allow us to determine if our initial source is providing a price that is outside of a reasonable range, we review our portfolio pricing on a weekly basis. When necessary, we challenge prices from our sources when a price provided does not match our expectations based on our evaluation of market trends and activity. Initially, we perform a review of our portfolio by sector to identify securities whose prices appear outside of a reasonable range. We then perform a more detailed review of fair values for securities disclosed as Level 2. We review dealer bids and quotes for these and/or similar securities to determine the market level context for our valuations. We then evaluate inputs relevant for each class of securities disclosed in the preceding hierarchy tables.

For our structured debt securities, including commercial, residential, and asset-backed securities, we evaluate available market-related data for these and similar securities related to collateral, delinquencies, and defaults for historical trends and reasonably estimable projections, as well as historical prepayment rates and current prepayment assumptions and cash flow estimates. We further stratify each class of our structured debt securities into more finite sectors (e.g., planned amortization class, first pay, second pay, senior, subordinated, etc.) and use duration, credit quality, and coupon to determine if the fair value is appropriate.

For our corporate debt and preferred stock (redeemable and nonredeemable) portfolios, as well as the notes and debentures issued by The Progressive Corporation (see Note 4 – Debt), we review securities by duration, coupon, and credit quality, as well as changes in interest rate and credit spread movements within that stratification. The review also includes recent trades, including: volume traded at various levels that establish a market, issuer specific fundamentals, and industry specific economic news as it comes to light.

For our municipal securities (e.g., general obligations, revenue, and housing), we stratify the portfolio to evaluate securities by type, coupon, credit quality, and duration to review price changes relative to credit spread and interest rate changes. Additionally, we look to economic data as it relates to geographic location as an indication of price-to-call or maturity predictors. For municipal housing securities, we look to changes in cash flow projections, both historical and reasonably estimable projections, to understand yield changes and their effect on valuation.

Lastly, for our short-term securities, we look at acquisition price relative to the coupon or yield. Since our short-term securities are typically 90 days or less to maturity, with the majority listed in Level 2 being 30 days or less to redemption, we believe that acquisition price is the best estimate of fair value.

We also review data assumptions as supplied by our sources to determine if that data is relevant to current market conditions. In addition, we independently review each sector for transaction volumes, new issuances, and changes in spreads, as well as the overall movement of interest rates along the yield curve to determine if sufficient activity and liquidity exists to provide a credible source for our market valuations.

During each valuation period, we create internal estimations of portfolio valuation (performance returns), based on current market-related activity (i.e., interest rate and credit spread movements and other credit-related factors) within each major sector of our portfolio. We compare our internally generated portfolio results with those generated based on quotes we receive externally and research material valuation differences. We compare our results to index returns for each major sector adjusting

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for duration and credit quality differences to better understand our portfolio’s results. Additionally, we review on a monthly basis our external sales transactions and compare the actual final market sales prices to previous market valuation prices. This review provides us further validation that our pricing sources are providing market level prices, since we are able to explain significant price changes (i.e., greater than 2%) as known events occur in the marketplace and affect a particular security’s price at sale.

This analysis provides us with additional comfort regarding the source’s process, the quality of its review, and its willingness to improve its analysis based on feedback from clients. We believe this effort helps ensure that we are reporting the most representative fair values for our securities.

Except as described below, our Level 3 securities are also priced externally; however, due to several factors (e.g., nature of the securities, level of activity, and lack of similar securities trading to obtain observable market level inputs), these valuations are more subjective in nature. Certain private equity investments and fixed-income investments included in the Level 3 category are valued using external pricing supplemented by internal review and analysis.

After all the valuations are received and our review is complete, if the inputs used by vendors are determined to not contain sufficient observable market information, we will reclassify the affected security valuations to Level 3. At June 30, 2018 and 2017, and December 31, 2017, we did not have any securities in our fixed-maturity portfolio listed as Level 3.

At June 30, 2018 and December 31, 2017, we held one private nonredeemable preferred security with a value of $5.0 million that was priced internally. The security was purchased during the third quarter 2017 and the value at both periods equals the cost at acquisition. A review of their latest available financial statements did not reveal any significant changes that would impact the security’s fair value. We did not hold any internally priced securities at June 30, 2017.

We review the prices from our external sources for reasonableness using internally developed assumptions to derive prices for the securities, which are then compared to the prices we received. During 2018 or 2017, there were no material assets or liabilities measured at fair value on a nonrecurring basis. Based on our review, all prices received from external sources remained unadjusted.

We did not have any material changes in fair value associated with Level 3 assets for the three and six months ended June 30, 2018 and 2017. Due to the relative size of the Level 3 securities’ fair values compared to the total portfolio’s fair value, any changes in pricing methodology would not have a significant change in valuation that would materially impact net or comprehensive income.

Note 4Debt — Debt at each of the balance sheet periods consisted of:

	June 30, 2018				June 30, 2017				December 31, 2017
(millions)	Carrying Value		Fair Value		Carrying Value		Fair Value		Carrying Value		Fair Value
3.75% Senior Notes due 2021	$	498.9	$	506.4	$	498.6	$	528.0	$	498.8	$	520.7
2.45% Senior Notes due 2027	496.3		451.3		496.0		474.2		496.1		477.9
6 5/8% Senior Notes due 2029	296.2		364.4		296.0		389.0		296.1		382.3
6.25% Senior Notes due 2032	395.4		492.5		395.2		522.7		395.3		516.9
4.35% Senior Notes due 2044	346.6		356.7		346.5		376.5		346.5		388.7
3.70% Senior Notes due 2045	395.3		363.9		395.2		389.7		395.2		402.9
4.125% Senior Notes due 2047	841.3		831.5		841.1		884.3		841.2		917.1
4.20% Senior Notes due 2048	589.5		592.3		0		0		0		0
Other debt instruments	0		0		114.8		114.8		37.1		37.1
Total	$	3,859.5	$	3,959.0	$	3,383.4	$	3,679.2	$	3,306.3	$	3,643.6

During the first quarter 2018, ARX repaid its term loans, in their entirety, in the aggregate principal amount of $37.1 million and, during the third quarter 2017, redeemed its junior subordinated notes and senior notes, in their entirety, in the aggregate principal amount of $65.2 million. Both the repayment and the redemptions were funded in part with proceeds from fixed-rate loans made by The Progressive Corporation. These intercompany transactions were eliminated in consolidation.

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The Progressive Corporation Debt

The Progressive Corporation issued $600 million of 4.20% Senior Notes due 2048 (the “4.20% Senior Notes”) in March 2018, and $850 million of 4.125% Senior Notes due 2047 (the “4.125% Senior Notes”) in April 2017, in underwritten public offerings. The net proceeds from these issuances, after deducting underwriters’ discounts, commissions, and other issuance costs, were approximately $589.5 million and $841.1 million, respectively. In addition, upon issuance of the 4.125% Senior Notes, we closed a forecasted debt issuance hedge, which was entered into to hedge against a possible rise in interest rates, and recognized an $8.0 million pretax unrealized loss as part of accumulated other comprehensive income (loss), which is being amortized as an adjustment to interest expense over the life of the 4.125% Senior Notes. Consistent with the other senior notes issued by Progressive, interest on the 4.20% Senior Notes and 4.125% Senior Notes is payable semiannually and both are redeemable, in whole or in part, at any time.

The Progressive Corporation Line of Credit

During the second quarter 2018, The Progressive Corporation entered into a new line of credit with PNC Bank, National Association (PNC) in the maximum principal amount of $250 million. The prior line of credit, entered into in April 2017, had expired. The line of credit is on the same terms and conditions as the previous line of credit. Subject to the terms and conditions of the line of credit documents, advances under the line of credit (if any) will bear interest at a variable rate equal to the higher of PNC’s Prime Rate or the sum of the Federal Funds Open Rate plus 50 basis points. Each advance must be repaid on the 30th day after the advance or, if earlier, on April 30, 2019, the expiration date of the line of credit. Prepayments are permitted without penalty. The line of credit is uncommitted and, as such, all advances are subject to PNC’s discretion. We had no borrowings under either line of credit during the first six months of 2018 or throughout 2017.

Note 5Income Taxes — Deferred tax assets and liabilities are recorded based on the difference between the financial statement and tax bases of assets and liabilities at the enacted tax rates. We review our deferred tax assets regularly for recoverability. At June 30, 2018 and 2017, and December 31, 2017, we determined that we did not need a valuation allowance on our gross deferred tax assets. Although realization of the deferred tax assets is not assured, management believes that it is more likely than not the deferred tax assets will be realized based on our expectation that we will be able to fully utilize the deductions that are ultimately recognized for tax purposes.

For deferred taxes on items that are reported in accumulated other comprehensive income, our policy is to release the income tax effects related to these items on an aggregate portfolio approach. For this purpose, we consider our available-for-sale fixed maturity securities and hedges on forecasted transactions as separate portfolios.

For the six months endedJune 30, 2018, there have been no material changes in our uncertain tax positions.

The effective tax rate for the three and six months ended June 30, 2018 were 20.3% and 20.1% respectively, compared to 32.8% and 32.9% for the same periods in 2017. The current year effective tax rate is lower primarily due to the reduction in the U.S. corporate income tax rate from 35% to 21%, effective January 1, 2018.

As of June 30, 2018, we have not fully completed our accounting for the tax effects of the enactment of the legislation commonly known as the Tax Cuts and Jobs Act of 2017 with regard to the deductibility of compensation expense for certain covered executives due to uncertainty surrounding the appropriate tax treatment of outstanding performance-based awards, and uncertainty surrounding the discount factors to be applied for loss reserve discounting. We are waiting for the Internal Revenue Service to publish additional guidance or information for both items.

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Note 6Loss and Loss Adjustment Expense Reserves — Activity in the loss and loss adjustment expense reserves is summarized as follows:

	June 30,
(millions)	2018		2017
Balance, Beginning of period	$	13,086.9	$	11,368.0
Less reinsurance recoverables on unpaid losses	2,170.1		1,801.0
Net balance, Beginning of period	10,916.8		9,567.0
Incurred related to:
Current year	10,164.6		8,804.1
Prior years	81.5		74.2
Total incurred	10,246.1		8,878.3
Paid related to:
Current year	5,533.7		4,951.0
Prior years	3,851.5		3,381.8
Total paid	9,385.2		8,332.8
Net balance, End of period	11,777.7		10,112.5
Plus reinsurance recoverables on unpaid losses	2,293.1		1,947.9
Balance, End of period	$	14,070.8	$	12,060.4

We experienced unfavorable reserve development of $81.5 million and $74.2 million for the first six months of 2018 and 2017, respectively, which is reflected as “Incurred related to prior years” in the table above.

Year-to-date June 30, 2018

• Approximately $72 million of the unfavorable prior year reserve development was attributable to accident years 2017 and 2016.

• Our personal auto business incurred about $57 million of unfavorable loss and loss adjustment expense (LAE) reserve development, with the Agency and Direct auto businesses contributing about $36 million and $21 million, respectively, of unfavorable development. The unfavorable development was primarily due to an increase in reopened personal injury protection (PIP) claims.

• Our Commercial Lines business experienced about $17 million of unfavorable development primarily due to late reported losses and higher LAE than anticipated.

• Our Property business recognized unfavorable development of about $7 million, while our special lines products had minimal development during the first half of the year.

Year-to-date June 30, 2017

• Approximately $56 million of the unfavorable prior year reserve development was attributable to accident year 2016 with the balance attributable to accident year 2015.

• Our commercial and personal auto businesses incurred about $102 million of unfavorable loss and LAE reserve development for the first six months of 2017, partially offset by the favorable loss and LAE reserve development of about $28 million in our special lines and Property businesses.

• Our Agency and Direct personal auto businesses incurred about $65 million and $29 million, respectively, of the total unfavorable reserve development, primarily due to an increase in costs related to property damage, more late reported bodily injury claims than anticipated, and higher LAE costs.

• Our Property business experienced about $20 million in favorable development primarily due to the identification of prior year losses eligible to be ceded under our catastrophe bond reinsurance program.

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Note 7Supplemental Cash Flow Information — Cash and cash equivalents include bank demand deposits and daily overnight reverse repurchase commitments of funds held in bank demand deposit accounts on ARX’s subsidiaries, which are primarily collateralized by U.S. Treasury notes. The amount of reverse repurchase commitments held by ARX’s subsidiaries at June 30, 2018 and 2017, and December 31, 2017, were $155.9 million, $130.2 million, and $247.2 million, respectively.

Restricted cash on our consolidated balance sheets represents cash that is restricted to pay flood claims under the National Flood Insurance Program’s “Write Your Own” program, for which American Strategic Insurance and other subsidiaries of ARX (ASI) are administrators.

We paid the following in the respective periods:

	Six Months Ended June 30,
(millions)	2018		2017
Income taxes	$	358.9	$	452.9
Interest	70.9		73.3

Income taxes paid for the six months ended June 30, 2017, was revised to correct the amount of tax payments disclosed for that period; there was no overall impact on the decrease in cash, cash equivalents, and restricted cash that was reported in our consolidated statement of cash flows for the six months ended June 30, 2017.

Note 8Segment Information — Our Personal Lines segment writes insurance for personal autos and recreational vehicles (our special lines products). Our Commercial Lines segment writes primary liability and physical damage insurance for automobiles and trucks owned and/or operated predominantly by small businesses in the business auto, for-hire transportation, contractor, for-hire specialty, tow, and for-hire livery markets. Our Property segment writes residential property insurance for homeowners, other property owners, and renters. Our other indemnity businesses include our run-off businesses. Our service businesses provide insurance-related services, including processing Commercial Automobile Insurance Procedures/Plans (CAIP) business and serving as an agent for homeowners, general liability, and workers’ compensation insurance, among other products, through our programs with ASI and unaffiliated insurance companies. All segment revenues are generated from external customers; all intercompany transactions, including those between Progressive and ASI, are eliminated in consolidation.

Following are the operating results for the respective periods:

	Three Months Ended June 30,										Six Months Ended June 30,
	2018					2017					2018					2017
(millions)	Revenues		Pretax Profit (Loss)			Revenues		Pretax Profit (Loss)			Revenues		Pretax Profit (Loss)			Revenues		Pretax Profit (Loss)
Personal Lines
Agency	$	3,225.7	$	360.9		$	2,752.5	$	205.5		$	6,289.5	$	770.0		$	5,384.0	$	455.2
Direct	3,211.8		287.9			2,650.0		162.7			6,228.1		585.9			5,173.7		338.0
Total Personal Lines1	6,437.5		648.8			5,402.5		368.2			12,517.6		1,355.9			10,557.7		793.2
Commercial Lines	884.3		100.3			671.7		56.2			1,692.9		195.1			1,317.2		123.6
Property2	312.4		(51.9		)	239.1		3.7			597.7		(23.4		)	465.1		11.5
Other indemnity	0		0			0		(0.1		)	0		0.2			0		(0.3		)
Total underwriting operations	7,634.2		697.2			6,313.3		428.0			14,808.2		1,527.8			12,340.0		928.0
Fees and other revenues3	116.0		NA			88.8		NA			219.8		NA			174.0		NA
Service businesses	42.9		5.9			32.7		5.7			77.1		10.8			61.2		8.3
Investments4	224.9		218.7			170.9		164.3			343.0		330.8			352.0		339.8
Other gains (losses)	0		0			0		0			0		0			0.2		0.2
Interest expense	NA		(41.7		)	NA		(43.4		)	NA		(78.5		)	NA		(80.2		)
Consolidated total	$	8,018.0	$	880.1		$	6,605.7	$	554.6		$	15,448.1	$	1,790.9		$	12,927.4	$	1,196.1

NA = Not applicable

¹ Personal auto insurance accounted for 94% of the total Personal Lines segment net premiums earned during the three and six months ended June 30, 2018, and 93% for the same periods in 2017; insurance for our special lines products (e.g., motorcycles, ATVs, RVs, watercraft, and snowmobiles) accounted for the balance of the Personal Lines net premiums earned.

² For the three and six months ended June 30, 2018, pretax profit (loss) includes $18.0 million and $36.0 million, respectively, of amortization expense predominately associated with the acquisition of a controlling interest in ARX and $15.5 million and $31.0 million for the same periods in 2017. Although this expense is included in our Property segment, it is not reported in the consolidated results of ARX and, therefore, will not affect the value of net income (loss) attributable to noncontrolling interest.

³ Pretax profit (loss) for fees and other revenues is attributable to operating segments.

⁴ Revenues represent recurring investment income and total net realized gains (losses) on securities; pretax profit is net of investment expense.

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Our management uses underwriting margin and combined ratio as primary measures of underwriting profitability. Underwriting profitability is calculated by subtracting losses and loss adjustment expenses, policy acquisition costs, and other underwriting expenses from the total of net premiums earned and fees and other revenues. The underwriting margin is the pretax underwriting profit (loss) expressed as a percentage of net premiums earned (i.e., revenues from underwriting operations). Combined ratio is the complement of the underwriting margin. Following are the underwriting margins/combined ratios for our underwriting operations for the respective periods:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	Under-writing Margin		Combined Ratio	Under-writing Margin		Combined Ratio	Under-writing Margin		Combined Ratio	Under-writing Margin		Combined Ratio
Personal Lines
Agency	11.2	%	88.8	7.5	%	92.5	12.2	%	87.8	8.5	%	91.5
Direct	9.0		91.0	6.1		93.9	9.4		90.6	6.5		93.5
Total Personal Lines	10.1		89.9	6.8		93.2	10.8		89.2	7.5		92.5
Commercial Lines	11.3		88.7	8.4		91.6	11.5		88.5	9.4		90.6
Property1	(16.6	)	116.6	1.5		98.5	(3.9	)	103.9	2.5		97.5
Total underwriting operations	9.1		90.9	6.8		93.2	10.3		89.7	7.5		92.5

¹ Included in the three and six months ended June 30, 2018 is 5.8 points and 6.0 points, respectively, of amortization expense predominately associated with the acquisition of a controlling interest in ARX and 6.5 points and 6.7 points, respectively, for the three and six months ended June 30, 2017.

Note 9Dividends

Annual Variable Common Share Dividends

We maintain a policy of paying an annual variable dividend on our common shares that, if declared, would be payable shortly after the close of the year. This annual variable dividend is based on a target percentage of after-tax underwriting income (using the statutory tax rate) multiplied by a performance factor (Gainshare factor), which is determined by reference to the Agency auto, Direct auto, special lines, Commercial Lines, and Property business units, with minor exclusions and adjustments, and subject to the limitations discussed below. The target percentage is determined by our Board of Directors on an annual basis and announced to shareholders and the public. In December 2017, the Board determined the target percentage for 2018 to be 33-1/3% of annual after-tax underwriting income, which is unchanged from the 2017 target percentage.

The Gainshare factor can range from zero to two and is determined by comparing our operating performance for the specified business units for the year to certain predetermined profitability and growth objectives approved by the Compensation Committee of the Board. This Gainshare factor is also used in the annual cash incentive program currently in place for our employees (our “Gainsharing program”). On a year-to-date basis, as of June 30, 2018, the Gainshare factor was 1.91. Since the final factor will be determined based on our results for the full year, the final factor may vary from the current factor.

Our annual dividend program will result in a variable payment to shareholders each year, subject to certain limitations. If the Gainshare factor is zero or if our comprehensive income is less than after-tax underwriting income, no dividend would be payable under our annual variable dividend policy. In addition, the ultimate decision on whether or not a dividend will be paid is in the discretion of the Board of Directors. The Board could decide to alter our policy, or not to pay the annual variable dividend, at any time prior to the declaration of the dividend for the year. Such an action by the Board could result from, among other reasons, changes in the insurance marketplace, changes in our performance or capital needs, changes in the U.S. federal income tax laws, disruptions of national or international capital markets, or other events affecting our business, liquidity, or financial position.

Following is a summary of our shareholder dividends that were declared in the last two years:

(millions, except per share amounts)			Amount of Common Share Dividends
Dividend Type	Declared	Paid	Per Share		Accrued1		Paid1
Annual – Variable	December 2017	February 2018	$	1.1247	$	655.1	$	654.9
Annual – Variable	December 2016	February 2017	0.6808		395.4		395.4

¹ Variance between accrued and paid, if any, reflects the difference between the number of estimated and actual shares outstanding as of the record date.

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Preferred Share Dividends

In the first quarter 2018, we issued 500,000 Series B Fixed-to-Floating Rate Cumulative Perpetual Serial Preferred Shares, without par value (the “Series B Preferred Shares”), with a liquidation preference of $1,000 per share (the “stated amount”). Holders of the Series B Preferred Shares will be entitled to receive cumulative cash dividends semi-annually in March and September, if and when declared by the Board of Directors. Until March 15, 2023 (the “fixed-rate period”), the annual dividend rate is fixed at 5.375% of the stated amount per share. Beginning March 15, 2023, the annual dividend rate switches to a floating rate equal to the three-month LIBOR rate plus a spread of 2.539% applied to the stated amount per share. After the fixed-rate period and up until redemption of the Series B Preferred Shares, the dividends would be payable quarterly, if and when declared by the Board of Directors. The Series B Preferred Shares are perpetual and have no stated maturity date. After the fixed-rate period, we may redeem the Series B Preferred Shares at the stated amount plus all accrued and unpaid dividends.

Note 10Other Comprehensive Income (Loss) — The components of other comprehensive income (loss), including reclassification adjustments by income statement line item, were as follows:

										Components of Changes in Accumulated Other Comprehensive Income (after tax)
(millions)	Pretax total accumulated other comprehensive income			Total tax (provision) benefit			After tax total accumulated other comprehensive income			Total net unrealized gains  (losses) on securities			Net unrealized gains on forecasted transactions			Foreign currency translation adjustment		(Income)loss attributable to NCI
Balance at March 31, 2018	$	(218.6	)	$	46.0		$	(172.6	)	$	(160.8	)	$	(17.8	)	$	0	$	6.0
Other comprehensive income (loss) before reclassifications:
Investment securities	(90.4		)	18.8			(71.6		)	(71.6		)	0			0		0
Forecasted transactions	0			0			0			0			0			0		0
Foreign currency translation adjustment	0			0			0			0			0			0		0
Loss attributable to noncontrolling interest (NCI)	0.7			(0.1		)	0.6			0			0			0		0.6
Total other comprehensive income (loss) before reclassifications	(89.7		)	18.7			(71.0		)	(71.6		)	0			0		0.6
Less: Reclassification adjustment for amounts realized in net income by income statement line item:
Net impairment losses recognized in earnings	0			0			0			0			0			0		0
Net realized gains (losses) on securities	(27.2		)	5.7			(21.5		)	(21.5		)	0			0		0
Interest expense	(0.3		)	0.1			(0.2		)	0			(0.2		)	0		0
Total reclassification adjustment for amounts realized in net income	(27.5		)	5.8			(21.7		)	(21.5		)	(0.2		)	0		0
Total other comprehensive income (loss)	(62.2		)	12.9			(49.3		)	(50.1		)	0.2			0		0.6
Balance at June 30, 2018	$	(280.8	)	$	58.9		$	(221.9	)	$	(210.9	)	$	(17.6	)	$	0	$	6.6

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										Components of Changes in Accumulated Other Comprehensive Income (after tax)
(millions)	Pretax total accumulated other comprehensive income			Total tax (provision) benefit			After tax total accumulated other comprehensive income			Total net unrealized gains  (losses) on securities			Net unrealized gains on forecasted transactions			Foreign currency translation adjustment		(Income)loss attributable to NCI
Balance at December 31, 2017	$	1,977.8		$	(695.6	)	$	1,282.2		$	1,295.0		$	(14.8	)	$	0	$	2.0
Cumulative effect adjustment1	(2,006.0		)	705.8			(1,300.2		)	(1,300.2		)	0			0		0
Reclassification of disproportionate tax effect2	0			(4.3		)	(4.3		)	(1.1		)	(3.2		)	0		0
Adjusted balance at December 31, 2017	(28.2		)	5.9			(22.3		)	(6.3		)	(18.0		)	0		2.0
Other comprehensive income (loss) before reclassifications:
Investment securities	(293.8		)	61.6			(232.2		)	(232.2		)	0			0		0
Forecasted transactions	0			0			0			0			0			0		0
Foreign currency translation adjustment	0			0			0			0			0			0		0
Loss attributable to noncontrolling interest (NCI)	5.8			(1.2		)	4.6			0			0			0		4.6
Total other comprehensive income (loss) before reclassifications	(288.0		)	60.4			(227.6		)	(232.2		)	0			0		4.6
Less: Reclassification adjustment for amounts realized in net income by income statement line item:
Net impairment losses recognized in earnings	0			0			0			0			0			0		0
Net realized gains (losses) on securities	(34.9		)	7.3			(27.6		)	(27.6		)	0			0		0
Interest expense	(0.5		)	0.1			(0.4		)	0			(0.4		)	0		0
Total reclassification adjustment for amounts realized in net income	(35.4		)	7.4			(28.0		)	(27.6		)	(0.4		)	0		0
Total other comprehensive income (loss)	(252.6		)	53.0			(199.6		)	(204.6		)	0.4			0		4.6
Balance at June 30, 2018	$	(280.8	)	$	58.9		$	(221.9	)	$	(210.9	)	$	(17.6	)	$	0	$	6.6

¹Reflects the fair value changes on equity securities as of December 31, 2017, which are reported as realized gains (losses) under the new accounting guidance. See Note 14 – New Accounting Standards for additional information.

²Reflects the effect of the change in the U.S. federal tax rate on our available-for-sale fixed maturity securities and our hedges on forecasted transactions as of December 31, 2017. See Note 14 – New Accounting Standards for additional information.

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										Components of Changes in Accumulated Other Comprehensive Income (after tax)
(millions)	Pretax total accumulated other comprehensive income			Total tax (provision) benefit			After tax total accumulated other comprehensive income			Total net unrealized gains  (losses) on securities			Net unrealized gains on forecasted transactions			Foreign currency translation adjustment			(Income)loss attributable to NCI
Balance at March 31, 2017	$	1,645.9		$	(578.4	)	$	1,067.5		$	1,072.0		$	(7.1	)	$	(0.8	)	$	3.4
Other comprehensive income (loss) before reclassifications:
Investment securities	177.2			(62.1		)	115.1			115.1			0			0			0
Forecasted transactions	(12.0		)	4.2			(7.8		)	0			(7.8		)	0			0
Foreign currency translation adjustment	(0.2		)	0.1			(0.1		)	0			0			(0.1		)	0
Loss attributable to noncontrolling interest (NCI)	(1.9		)	0.6			(1.3		)	0			0			0			(1.3		)
Total other comprehensive income (loss) before reclassifications	163.1			(57.2		)	105.9			115.1			(7.8		)	(0.1		)	(1.3		)
Less: Reclassification adjustment for amounts realized in net income by income statement line item:
Net impairment losses recognized in earnings	(2.6		)	0.9			(1.7		)	(1.7		)	0			0			0
Net realized gains (losses) on securities	37.2			(13.0		)	24.2			24.2			0			0			0
Interest expense	0.3			(0.1		)	0.2			0			0.2			0			0
Total reclassification adjustment for amounts realized in net income	34.9			(12.2		)	22.7			22.5			0.2			0			0
Total other comprehensive income (loss)	128.2			(45.0		)	83.2			92.6			(8.0		)	(0.1		)	(1.3		)
Balance at June 30, 2017	$	1,774.1		$	(623.4	)	$	1,150.7		$	1,164.6		$	(15.1	)	$	(0.9	)	$	2.1

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										Components of Changes in Accumulated Other Comprehensive Income (after tax)
(millions)	Pretax total accumulated other comprehensive income			Total tax (provision) benefit			After tax total accumulated other comprehensive income			Total net unrealized gains  (losses) on securities			Net unrealized gains on forecasted transactions			Foreign currency translation adjustment			(Income)loss attributable to NCI
Balance at December 31, 2016	$	1,439.5		$	(506.1	)	$	933.4		$	939.6		$	(9.4	)	$	(1.1	)	$	4.3
Other comprehensive income (loss) before reclassifications:
Investment securities	431.7			(151.3		)	280.4			280.4			0			0			0
Forecasted transactions	(8.0		)	2.8			(5.2		)	0			(5.2		)	0			0
Foreign currency translation adjustment	0.3			(0.1		)	0.2			0			0			0.2			0
Loss attributable to noncontrolling interest (NCI)	(3.4		)	1.2			(2.2		)	0			0			0			(2.2		)
Total other comprehensive income (loss) before reclassifications	420.6			(147.4		)	273.2			280.4			(5.2		)	0.2			(2.2		)
Less: Reclassification adjustment for amounts realized in net income by income statement line item:
Net impairment losses recognized in earnings	(3.6		)	1.3			(2.3		)	(2.3		)	0			0			0
Net realized gains (losses) on securities	88.8			(31.1		)	57.7			57.7			0			0			0
Interest expense	0.8			(0.3		)	0.5			0			0.5			0			0
Total reclassification adjustment for amounts realized in net income	86.0			(30.1		)	55.9			55.4			0.5			0			0
Total other comprehensive income (loss)	334.6			(117.3		)	217.3			225.0			(5.7		)	0.2			(2.2		)
Balance at June 30, 2017	$	1,774.1		$	(623.4	)	$	1,150.7		$	1,164.6		$	(15.1	)	$	(0.9	)	$	2.1

In an effort to manage interest rate risk, we often enter into forecasted transactions on Progressive’s debt issuances. We expect to reclassify $1.0 million (pretax) into interest expense during the next 12 months, related to net unrealized losses on forecasted transactions (see Note 4 – Debt for further discussion).

Note 11Litigation — The Progressive Corporation and/or its insurance subsidiaries are named as defendants in various lawsuits arising out of claims made under insurance policies written by our insurance subsidiaries in the ordinary course of business. We consider all legal actions relating to such claims in establishing our loss and loss adjustment expense reserves. In addition, The Progressive Corporation and/or its subsidiaries are named as defendants in a number of class action or individual lawsuits that challenge certain of the operations of the subsidiaries.

These cases include those alleging damages as a result of our subsidiaries’ practices in evaluating or paying medical or injury claims or benefits, including, but not limited to, personal injury protection, medical payments, and bodily injury benefits; the utilization, content, or appearance of policy documents; labor rates paid to auto body repair shops; wage and hour issues; and cases challenging other aspects of our subsidiaries’ claims, marketing, or sales practices, or other business operations. Other insurance companies face many of these same issues.

The nature and volume of litigation to which The Progressive Corporation is subject is similar to that which was disclosed in Note 12 – Litigation in our 2017 Annual Report to Shareholders.

We plan to contest the pending lawsuits vigorously, but may pursue settlement negotiations in some cases, if appropriate. The outcomes of pending cases are uncertain at this time. We establish accruals for these lawsuits when it is probable that a loss has been or will be incurred and we can reasonably estimate potential loss exposure, which may include a range of loss. As to lawsuits for which the loss is considered neither probable or estimable, or is considered probable but not estimable, we do not establish an accrual. Nevertheless, we continue to evaluate this pending litigation to determine if any losses not deemed probable and estimable become so, at which point we would establish an accrual at our best estimate of the loss or range of loss.

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With respect to our pending lawsuits that are not related to claims under insurance policies, the accruals that we have established, if any, were not material at June 30, 2018 or 2017, and there were no material settlements during the first six months of 2018 or 2017. For most of these lawsuits, we do not consider any losses to be both probable and estimable, and we are unable to estimate a meaningful range of loss, if any, at this time, due to the factors discussed in Note 12 – Litigation in our 2017 Annual Report to Shareholders.In the event that any one or more of these lawsuits results in a substantial judgment against or settlement by us, or if our accruals (if any) prove to be inadequate by a significant amount, the resulting liability could have a material adverse effect on our consolidated financial condition, cash flows, and/or results of operations. For a further discussion on our pending litigation and related reserving policies, see Note 12 – Litigation in our 2017 Annual Report to Shareholders.

Note 12 Redeemable Noncontrolling Interest — In connection with the April 2015 acquisition of a controlling interest in ARX, The Progressive Corporation entered into a stockholders’ agreement with the other ARX stockholders. As part of the stockholders’ agreement, the minority ARX stockholders had the right to “put” a portion of their ARX shares to Progressive in 2018, and have the right to put all of their remaining shares to Progressive in 2021. During the second quarter 2018, the minority ARX stockholders put 204,527 shares, including 5,483 shares that were issued upon the exercise of outstanding stock options, bringing Progressive’s total ownership interest in ARX to 86.7%. Progressive acquired these additional shares, in a cash transaction, for a total cost of $295.9 million. If ARX stockholders do not put all of their shares to Progressive in 2021, Progressive has the ability to “call” all of the outstanding shares shortly thereafter and to bring its ownership stake to 100% in 2021. See Note 15 – Redeemable Noncontrolling Interest in our 2017 Annual Report to Shareholders for a discussion of the purchase price for shares to be purchased by Progressive pursuant to these put or call rights.

Since these securities are redeemable upon the occurrence of an event that is not solely within the control of Progressive, we have recorded the redeemable noncontrolling interest (NCI) as mezzanine equity on our consolidated balance sheets, which represents the minority shares at the current estimated purchase price pursuant to the put and call provisions of the stockholders’ agreement. The estimated purchase price is based, in part, on the change in tangible net book value of ARX from December 31, 2014 to the balance sheet dates.

In addition to these minority shares, at June 30, 2018, ARX employees held options to purchase 16,067 ARX shares. These options and any shares issued upon exercise are subject to the stockholders’ agreement, including the “put” and “call” rights described above. Until the options are exercised, the underlying obligation of approximately $23.2 million is not recorded as part of redeemable NCI. See Note 9 – Employee Benefit Plans in our 2017 Annual Report to Shareholders for a discussion of our employee stock options.

The changes in the components of redeemable NCI during the six months endedJune 30, 2018 and 2017, and the year ended December 31, 2017, were:

(millions)	June 30, 2018			June 30, 2017		December 31, 2017
Balance, Beginning of period	$	503.7		$	483.7	$	483.7
Net income attributable to NCI	8.8			11.1		5.9
Other comprehensive income (loss) attributable to NCI	(4.6		)	2.2		2.3
Exercise of employee stock options	9.4			3.4		3.4
Purchase of ARX shares	(295.9		)	0		0
Change in redemption value of NCI	(3.2		)	1.4		8.4
Balance, End of period	$	218.2		$	501.8	$	503.7

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Note 13 Goodwill and Intangible Assets

Goodwill

During the six months ended June 30, 2018, there were no changes to the carrying amount of goodwill. Goodwill recorded at June 30, 2018 and 2017, and December 31, 2017 was $452.7 million. No accumulated goodwill impairment losses exist.

Intangible Assets

The following table is a summary of the net carrying amount of other intangible assets as of June 30, 2018 and 2017, and December 31, 2017:

(millions)	June 30, 2018		June 30, 2017		December 31, 2017
Intangible assets subject to amortization	$	318.2	$	389.4	$	354.2
Indefinite-lived intangible assets1	12.4		12.4		12.4
Total	$	330.6	$	401.8	$	366.6

¹ Indefinite-lived intangible assets are comprised of state insurance and agent licenses. State insurance licenses were previously subject to amortization under superseded accounting guidance and have $0.6 million of accumulated amortization for all periods presented.

Intangible assets subject to amortization consisted of the following:

(millions)	June 30, 2018						June 30, 2017						December 31, 2017
Category	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Policies in force	$	256.2	$	119.0	$	137.2	$	256.2	$	82.4	$	173.8	$	256.2	$	100.7	$	155.5
Agency relationships	159.2		37.0		122.2		159.2		25.6		133.6		159.2		31.3		127.9
Software rights	79.1		34.7		44.4		79.1		24.1		55.0		79.1		29.4		49.7
Trade name	34.8		20.4		14.4		34.8		7.8		27.0		34.8		13.7		21.1
Total	$	529.3	$	211.1	$	318.2	$	529.3	$	139.9	$	389.4	$	529.3	$	175.1	$	354.2

Amortization expense was $18.0 million and $36.0 million for the three and six months ended June 30, 2018, respectively, compared to $15.5 million and $31.0 million during the same periods last year.

During the third quarter 2017, we revised our estimate of the economic useful life of our trade name intangible asset from an original life of 10 years to a remaining life of 2 years. The decrease in the useful life represents the estimated length of time that it is expected to take to transition the branding of our Property products from the ASI trade name to the Progressive brand. As of June 30, 2018, the remaining average life of all of our intangible assets is 4.4 years.

Note 14 New Accounting Standards

Issued

In January 2018, the Financial Accounting Standards Board (FASB) proposed an Accounting Standards Update (ASU), which would provide targeted improvements to the new lease accounting guidance issued by the FASB in February 2016 (the “2016 ASU”). The 2016 ASU, which eliminates the off-balance-sheet accounting for leases, will require lessees to report their operating leases as both an asset and liability on the statement of financial position and to disclose key information about leasing arrangements in the financial statement footnotes. Under the 2016 ASU, there will be no change to the recognition of lease expense in our results of operations. The 2016 ASU will be effective for fiscal years (including interim periods within those fiscal years) beginning after December 15, 2018 (2019 for calendar-year companies). Under the proposed guidance, companies would have the option to apply the new lease requirements either as of the effective date (i.e., January 1, 2019), with comparative information presented in accordance with the previous standard, or on a modified retrospective basis, which would restate all financial statement information as of the beginning of the earliest period presented and is the transition method under the 2016 ASU. Based on our lease portfolio at June 30, 2018, and in accordance with the accounting elections available in the 2016 ASU, we would have recorded an increase to assets and liabilities of approximately $140 million, and there would have been no impact on our results of operations or cash flows. Therefore, we do not expect this standard to have a material impact on our financial condition.

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In March 2017, the FASB issued an ASU related to premium amortization on purchased callable debt securities. The intent of the standard is to shorten the amortization period for certain purchased callable debt securities held at a premium. Under the ASU, the premium is required to be amortized to the earliest call date. The ASU more closely aligns interest income recorded on bonds held at a premium with the economics of the underlying instrument. The ASU, which is required to be applied on a modified retrospective basis, is effective for fiscal years beginning after December 15, 2018 (2019 for calendar-year companies), and interim periods within those fiscal years. Since we have historically used a yield-to-worst scenario for our securities that were purchased at a premium, and the first call on a premium security most often produces the lowest and most conservative yield, we do not expect this standard to have a significant impact on our financial condition, cash flows, or results of operations.

In January 2017, the FASB issued an ASU, which eliminates the requirement to determine the implied fair value of goodwill in measuring an impairment loss. Upon adoption, the measurement of a goodwill impairment will represent the excess of the reporting unit’s carrying value over fair value, limited to the carrying value of goodwill. This ASU is effective for goodwill impairment tests in fiscal years beginning after December 15, 2019 (2020 for calendar-year companies), with early adoption permitted. We do not expect this standard to have a material impact on our financial position or results of operations.

In June 2016, the FASB issued an ASU intended to improve the timing, and enhance the accounting and disclosure, of credit losses on financial assets. Additionally, this update will modify the existing accounting guidance related to the impairment evaluation for available-for-sale debt securities and will result in the creation of an allowance for credit losses as a contra asset account. The ASU will require cumulative-effect changes to retained earnings in the period of adoption, if any occur, and will also require prospective changes on previously recorded impairments. This ASU is effective for fiscal years (including interim periods within those fiscal years) beginning after December 15, 2019 (2020 for calendar-year companies), with early adoption permissible (including interim periods within that fiscal year) beginning after December 15, 2018 (2019 for calendar-year companies). While the ASU creates additional accounting complexities related to the recognition of the impairment losses, and subsequent recoveries, through an allowance for credit losses account, we do not expect the ASU to have a material impact on our current method of evaluating securities for credit losses or the timing or recognition of the amounts of the impairment losses.

Adopted

On January 1, 2018, we adopted the ASU intended to improve the recognition and measurement of financial instruments. Under this update, the changes in fair value of equity securities are recognized as a component of net income. Upon adoption, we recorded a cumulative-effect adjustment of $1.3 billion, which is net of taxes. The cumulative-effect adjustment represents the amount of after-tax net unrealized gains on equity securities that was recorded as part of accumulated other comprehensive income at December 31, 2017. The adoption of this ASU had no impact on comprehensive income. Consistent with our historical presentation, cash flows on equity securities will be reflected as investing activities in the Consolidated Statements of Cash Flows.

In the first quarter 2018, we adopted the ASU related to the reclassification of certain tax effects from accumulated other comprehensive income. This update provided companies with the option to reclassify disproportionate tax effects in accumulated other comprehensive income caused by the legislation commonly known as the Tax Cuts and Jobs Act of 2017 to retained earnings. We opted to make the reclassification, which resulted in a decrease to accumulated other comprehensive income and an offsetting increase to retained earnings of $4.3 million. This reclass was solely due to the effect of the change in the U.S. federal tax rate on our available-for-sale fixed-maturity securities and our hedges on forecasted transactions. There were no disproportionate tax effects related to our equity securities subsequent to adopting the ASU related to classification and measurement discussed above.

Note 15 Reclassification — For the three and six months ended June 30, 2017, we reclassified the change in the net holding period gains (losses) on hybrid securities held at June 30, 2017 to “net holding period gains (losses) on securities” out of “net realized gains (losses) on security sales” to conform with the current-year Consolidated Statements of Comprehensive Income presentation. There was no overall impact on total net realized gains (losses) on securities. We also reclassified the classification and presentation of restricted cash in our Consolidated Statements of Cash Flows in accordance with the accounting guidance we adopted for the year ended December 31, 2017 relating to this item; there was no overall impact on the increase in cash, cash equivalents, and restricted cash as a result of this reclassification. In addition, on our Consolidated Balance Sheets for December 31, 2017, we reclassified our “dividends payable” into “accounts payable, accrued expenses, and other liabilities” to be consistent with the current period presentation.

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

I. OVERVIEW

The Progressive Corporation’s insurance subsidiaries recognized strong growth in both premiums and policies in force in the second quarter 2018, compared to the same period last year. During the quarter, we generated $8.1 billion of net premiums written, which is an increase of $1.3 billion, or 20%, compared to the second quarter 2017. In addition, on a quarter-over-prior-year quarter basis, companywide net premiums earned increased 21% and policies in force grew 13%. We ended the quarter with 19.6 million total policies in force. For the second quarter 2018, we produced an underwriting margin of 9.1%, 2.3 points better than the second quarter last year, and a 63% increase in our pretax underwriting profitability. The increase in profitability for the second quarter 2018, on a year-over-year basis, in part reflects our increase in average written premium per policy along with decreases in our auto claims frequency and fewer catastrophe losses in 2018.

On a year-over-year basis, net income attributable to Progressive increased 92% for the second quarter and 80% for the first six months, primarily due to growth in our underwriting profitability and the lower effective tax rate in 2018, which reflects the change in the statutory tax rate to 21% from 35%. Comprehensive income attributable to Progressive increased 45% for the quarter and 21% year-to-date on a year-over-year basis. Comprehensive income includes a decrease in the value of our investment portfolio during 2018, compared to an increase in the portfolio valuation during the same periods last year. Due to a change in accounting guidance, as of January 1, 2018, the change in value of our equity securities is reported as a component of net income, instead of being a component of “other comprehensive income,” while the change in value of fixed-maturity securities remains part of “other comprehensive income.” This accounting change may cause more volatility in net income based on equity market conditions. Therefore, comprehensive income may be a more beneficial measure of our overall performance.

During the second quarter 2018, our total capital (debt plus shareholders’ equity) increased $0.7 billion, to $14.9 billion, primarily reflecting income during the quarter.

A. Insurance Operations

Our Personal and Commercial Lines operating segments were profitable during the second quarter 2018, while our Property business generated an underwriting loss, primarily due to catastrophe losses incurred during the quarter. All three segments contributed to our solid premium and policy in force growth during the second quarter on a year-over-year basis.

Our Personal Lines underwriting profit margin was 10.1% and Commercial Lines was 11.3%, while Property had an underwriting loss margin of 16.6%, which included 26.1 points of catastrophe losses, net of reinsurance, as well as 5.8 points of amortization expense, predominately related to our acquisition of a controlling interest of ARX Holding Corp. (ARX) in 2015. Our special lines products were also profitable in the second quarter, but their results had a minimal impact on our total Personal Lines combined ratio.

On a year-over-year basis, our catastrophe losses for the quarter were down 1.0 point. About 70% of the catastrophe losses in the second quarter 2018, both on the vehicle and Property businesses, were due to storms in Texas and Colorado. For the quarter, our companywide prior accident years development had a 0.3 point unfavorable impact, compared to a 0.6 point favorable impact in the second quarter 2017. Our overall incurred personal auto frequency was down around 2.6%, while severity was up about 2.3%. While we priced for the increase in severity, we were not anticipating the continued decrease in frequency, which contributed to the underwriting profitability in the quarter.

During the second quarter 2018, we renewed our catastrophe reinsurance coverage, which is in addition to our aggregate stop-loss agreement that was renewed at the beginning of the year and our multi-year reinsurance coverage still in effect. Under our catastrophe reinsurance, we increased our retention level to $60 million, from the $50 million retention we had in place last year. The increase reflects our decision to retain more of the catastrophe losses given our premium and regulatory capital growth during the year.

During the quarter, total new personal auto applications (i.e., issued policies) increased 27% on a year-over-year basis, including a 21% and 32% increase in our Agency auto and Direct auto businesses, respectively. The significant increase in Direct auto applications reflects, in part, lower growth during the second quarter 2017. On a year-over-year basis, the personal auto businesses benefited from increased advertising spend, as well as competitive product offerings and position in the marketplace. We will continue to spend on marketing when we believe that it is an efficient use of our dollars. We continued to generate strong new business application growth in our bundled auto and home customers (i.e., Robinsons) in both the Agency and Direct channels. New applications for our special lines products were up 2% during the second quarter 2018, compared to the same period last year.

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For the Commercial Lines business, new applications increased 9% on a year-over-year basis during the second quarter 2018. Most of the underwriting restrictions that were implemented in the first quarter of 2018 were lifted during the second quarter 2018. We will continue to monitor our rate levels with a view toward continuing to grow profitably while providing high-quality customer service.

The Property business had an 81% increase in new applications for the second quarter 2018, compared to the same period last year and growth is strong in both the agency and direct channels. Our home/condo products grew nearly 60%, while the balance was due to an increase in our renters, umbrella, and manufactured home products. We have increased our state footprint since the second quarter last year for both the homeowners and renters products.

In addition, our product offerings were more competitive during the second quarter and we saw growth through HomeQuote Explorer^® (HQX), our online quoting platform for home insurance. Where available, we incorporated HQX into our online bundled auto and home quoting experience. We have also added the ability to buy select products online through HQX to meet our customers needs. The “buy button” is currently only in one state but we plan to roll out to other states over time.

During the quarter, on a year-over-year basis, our written premium per policy for our personal auto businesses increased about 5%, primarily reflecting a shift in the mix of business toward higher premium coverages and the rate increases taken during the last 12 months. Written premium per policy increased 4% for our special lines products and increased 12% for our Commercial Lines business. The Commercial Lines increase reflects rate actions throughout 2017, as well as shifts in our mix of businesses to higher premium products. The total written premium per policy for the Property business decreased 5%, reflecting the renters business, which has lower premiums per policy, comprising a greater proportion of the total Property business. For our core Property business (e.g., home and condo insurance), the written premium per policy increased slightly. We continue to manage rate levels in our Property business to help meet our profitability targets in this segment.

We ended the second quarter 2018 with 12.8 million personal auto policies in force, with Agent auto and Direct auto growing 14% and 17%, respectively, over the the same period last year. Our special lines products policies in force grew 1% over the second quarter last year, Commercial Lines grew 9%, and Property grew 35%. On a year-over-year basis, total Personal Lines increased policies in force by about 1.7 million policies, Commercial Lines increased policies by just over 53,000, and Property increased policies by 455,500.

To grow policies in force, it is critical that we retain our customers for longer periods. Consequently, increasing retention is one of our most important priorities, and our efforts to increase our share of multi-product households continue to be a key initiative to support that goal. Policy life expectancy, which is our actuarial estimate of the average length of time that a policy will remain in force before cancellation or lapse in coverage, is our primary measure of customer retention in our vehicle businesses. Policy life expectancy has increased in Personal Lines, with our trailing 12-month total auto policy life expectancy up 10% over the second quarter last year and special lines was flat. Our Agency auto and Direct auto policy life expectancy were up 11% and 9%, respectively. These increases reflect the competitive markets as well as our Destination Era initiatives, where we have experienced an increase in customers who bundle their auto coverage with other products, which tends to translate to longer relationships with these customers. For Commercial Lines, our policy life expectancy increased 2% year over year.

B. Investments

The fair value of our investment portfolio was $30.9 billion at June 30, 2018. Our asset allocation strategy is to maintain 0%-25% of our portfolio in Group I securities, with the balance (75%-100%) of our portfolio in Group II securities (the securities allocated to Group I and II are defined below under Results of Operations – Investments). At June 30, 2018, 16% of our portfolio was allocated to Group I securities and 84% to Group II securities, compared to 17% and 83%, respectively, at December 31, 2017.

Our recurring investment income generated a pretax book yield of 2.7% for the second quarter2018, compared to 2.3% for the same period in 2017. Our investment portfolio produced a fully taxable equivalent (FTE) total return of 0.6% for the second quarter2018, compared to 1.3% for the same period in 2017. Our fixed-income and common stock portfolios had FTE total returns of 0.3% and 3.1%, respectively, for the second quarter2018, compared to 1.1% and 3.5%, respectively, last year.

At June 30, 2018, the fixed-income portfolio had a weighted average credit quality of AA- and a duration of 2.6 years, compared to AA- and 2.5 years, respectively, at December 31, 2017. We lengthened our portfolio duration modestly during the first half of the year in response to higher interest rates as the risk/reward to our portfolio’s value at higher rate levels moved toward a more balanced position. However, our duration remains below the mid-point of our range as a means to limit any decline in portfolio value from an increase in rates from current low levels.

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II. FINANCIAL CONDITION

A. Liquidity and Capital Resources

Progressive’s insurance operations create liquidity by collecting and investing premiums from new and renewal business in advance of paying claims. Operations generated positive cash flows of about $3.5 billion and $2.0 billion for the first six months of 2018 and 2017, respectively. The year-over-year increase primarily reflects the increase in premiums collected in excess of paid losses due to strong growth during the period.

Our unsecured discretionary line of credit (the “Line of Credit”) with PNC Bank, National Association (PNC) in the maximum principal amount of $250 million was renewed during April 2018, on the same terms and conditions, and will expire on April 30, 2019. We did not engage in any short-term borrowings, including under our discretionary Line of Credit, to fund our operations or for liquidity purposes during the reported periods.

During the second quarter, in accordance with our stockholders’ agreement related to the ARX acquisition, The Progressive Corporation increased its share ownership of ARX to 86.7% when the minority ARX stockholders put 204,527 shares to Progressive, at a total cost of $295.9 million. The Progressive Corporation has the ability to achieve 100% ownership of ARX by the end of the second quarter of 2021. See Note 12 – Redeemable Noncontrolling Interest for further discussion.

Our total capital (debt plus shareholders’ equity) was $14.9 billion, at book value, at June 30, 2018, compared to $12.4 billion at June 30, 2017 and $12.6 billion at December 31, 2017. The increase since year end reflects the increase in comprehensive income during that period as well as the issuance of $600 million of 4.20% Senior Notes due 2048 and $500 million of Series B Fixed-to-Floating Rate Cumulative Perpetual Serial Preferred Shares (the “Series B Preferred Shares”), in underwritten public offerings, during the first quarter 2018.

Our repurchases of common stock were not material during the second quarter of 2018, and we repurchased 702,255 shares at a total cost of $39.4 million on a year-to-date basis. No dividends were declared during the six months ended June 30, 2018. During the first quarter, we paid $654.9 million of common share dividends, which were declared in December 2017. Also, during the first quarter 2018, ARX repaid in full its term loans in the aggregate principal amount of $37.1 million. At June 30, 2018, ARX has no external borrowings outstanding.

Our debt-to-total capital ratio remained below 30% during all reported periods, consistent with our financial policy. This ratio, which reflects debt as a percent of debt plus shareholders’ equity and excludes redeemable noncontrolling interest, was 26.0% at June 30, 2018, 27.3% at June 30, 2017, and 26.3% at December 31, 2017.

We seek to deploy capital in a prudent manner and use multiple data sources and modeling tools to estimate the frequency, severity, and correlation of identified exposures, including, but not limited to, catastrophic and other insured losses, natural disasters, and other significant business interruptions, to estimate our potential capital needs. During the first six months of 2018 and at all times during 2017, our total capital exceeded the sum of our regulatory capital layer plus our self-constructed extreme contingency layer, as described in our Annual Report to Shareholders for the year ended December 31, 2017.

Based upon our capital planning and forecasting efforts, we believe that we have sufficient capital resources and cash flows from operations to support our current business, scheduled principal and interest payments on our debt, dividends on our Series B Preferred Shares, our contractual obligations, and other expected capital requirements for the foreseeable future. Nevertheless, depending on our levels of premium growth and regulatory capital needs, underwriting profitability, including hurricane activity and other catastrophic storms and events, investment returns, and capital outlays through dividends, among other factors, we may need to raise additional capital in the next 12 months to satisfy our capital needs. It is possible that a capital-raising transaction involving debt securities could cause our debt-to-total capital ratio to exceed our published financial policy for a period of time.

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B. Commitments and Contingencies

Contractual Obligations

During the first six months of 2018, our contractual obligations have not changed materially from those discussed in our Annual Report on Form 10-K for the year ended December 31, 2017, other than the debt and preferred share issuance transactions described above.

Off-Balance-Sheet Arrangements

Our off-balance-sheet leverage includes operating leases and purchase obligations. There have been no material changes in the off-balance-sheet items since the discussion in the notes to the financial statements in Progressive’s Annual Report on Form 10-K for the year ended December 31, 2017.

III. RESULTS OF OPERATIONS – UNDERWRITING

A. Segment Overview

We report our underwriting operations in three segments: Personal Lines, Commercial Lines, and Property. As a component of our Personal Lines segment, we report our Agency and Direct business results to provide further understanding of our products by distribution channel. Our other indemnity businesses include our run-off businesses.

The following table shows the composition of our companywide net premiums written, by segment, for the respective periods:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Personal Lines
Agency	42	%	43	%	42	%	43	%
Direct	40		40		42		42
Total Personal Lines1	82		83		84		85
Commercial Lines	13		13		12		11
Property	5		4		4		4
Total underwriting operations	100	%	100	%	100	%	100	%

¹ Personal auto insurance accounted for 91%and93% of the total Personal Lines segment net premiums written during the three and six months ended June 30, 2018, respectively, and 89% and 92% for the same periods in 2017; insurance for our special lines products accounted for the balance.

Our Personal Lines business writes insurance for personal autos and special lines products (e.g., motorcycles, watercraft, and RVs). We currently write our Personal Lines products in all 50 states. We also offer our personal auto product (not special lines products) in the District of Columbia. Our personal auto policies are primarily written for 6-month terms, while the special lines products are written for 12-month terms.

Our Commercial Lines business writes primary liability, physical damage, and other auto-related insurance for automobiles and trucks owned and/or operated predominantly by small businesses. While the majority of our Commercial Lines business is written through the independent agency channel, the amount of business written through the direct channel continues to grow and represented about 12% of premiums written for the first six months of 2018. We write Commercial Lines business in all 50 states and the majority of our policies are written for 12-month terms.

Our Property business writes residential property insurance (single family homes, condominium unit owners, rental coverage, etc.) for homeowners, other property owners, and renters. Our Property business primarily consists of the operations of the ARX organization. ARX wholly owns or controls the insurance companies that we refer to in the aggregate as “ASI.” We write the majority of our Property business through the independent agency channel; however, we continue to expand the distribution of our Property product offerings in the direct channel. Property policies are written for a 12-month term. ASI writes residential property in 43 states and the District of Columbia, with Vermont being the latest state where we began writing business. ASI also writes flood insurance in 44 states and the District of Columbia, and ASI and Progressive write renters insurance in 44 states and the District of Columbia. Florida and Texas remain the largest states for the Property business comprising just over 40% of the year-to-date premium volume. We continue to transition ASI products from the ASI trade name to the Progressive brand. We expect to complete the transition in both our agency and direct channels over the next year.

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B. Profitability

Profitability for our underwriting operations is defined by pretax underwriting profit, which is calculated as net premiums earned plus fees and other revenues less losses and loss adjustment expenses, policy acquisition costs, and other underwriting expenses. We also use underwriting margin, which is underwriting profit or loss expressed as a percentage of net premiums earned, to analyze our results. For the respective periods, our underwriting profitability results were as follows:

	Three Months Ended June 30,										Six Months Ended June 30,
	2018					2017					2018					2017
	Underwriting Profit (Loss)					Underwriting Profit (Loss)					Underwriting Profit (Loss)					Underwriting Profit (Loss)
($ in millions)	$			Margin		$			Margin		$			Margin		$			Margin
Personal Lines
Agency	$	360.9		11.2	%	$	205.5		7.5	%	$	770.0		12.2	%	$	455.2		8.5	%
Direct	287.9			9.0		162.7			6.1		585.9			9.4		338.0			6.5
Total Personal Lines	648.8			10.1		368.2			6.8		1,355.9			10.8		793.2			7.5
Commercial Lines	100.3			11.3		56.2			8.4		195.1			11.5		123.6			9.4
Property1	(51.9		)	(16.6	)	3.7			1.5		(23.4		)	(3.9	)	11.5			2.5
Other indemnity2	0			NM		(0.1		)	NM		0.2			NM		(0.3		)	NM
Total underwriting operations	$	697.2		9.1	%	$	428.0		6.8	%	$	1,527.8		10.3	%	$	928.0		7.5	%

¹ For the three and six months ended June 30, 2018, amounts include $18.0 million and $36.0 million, respectively, of amortization expense predominately associated with the acquisition of a controlling interest in ARX, and $15.5 million and $31.0 million for the respective periods last year. The increase in amortization expense reflects a change in the economic useful life of the trade name intangible asset; see Note 13 – Goodwill and Intangible Assets for further discussion.

² Underwriting margins for our other indemnity businesses are not meaningful (NM) due to the lack of premiums earned by, and the variability of loss costs in, such businesses.

Our underwriting profit margin increased in both the second quarter and first six months of 2018, compared to the same periods last year. The increase was driven by higher written premium per policy on both our personal and commercial auto products, lower than anticipated frequency, and lower catastrophe losses, as compared to last year.

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Further underwriting results for our Personal Lines business, including results by distribution channel, the Commercial Lines business, the Property business, and our underwriting operations in total, were as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
Underwriting Performance1	2018	2017	Change		2018	2017	Change
Personal Lines—Agency
Loss & loss adjustment expense ratio	69.4	73.0	(3.6	) pts.	68.6	71.9	(3.3	) pts.
Underwriting expense ratio	19.4	19.5	(0.1	) pts.	19.2	19.6	(0.4	) pts.
Combined ratio	88.8	92.5	(3.7	) pts.	87.8	91.5	(3.7	) pts.
Personal Lines—Direct
Loss & loss adjustment expense ratio	70.9	75.0	(4.1	) pts.	70.3	73.8	(3.5	) pts.
Underwriting expense ratio	20.1	18.9	1.2	pts.	20.3	19.7	0.6	pts.
Combined ratio	91.0	93.9	(2.9	) pts.	90.6	93.5	(2.9	) pts.
Total Personal Lines
Loss & loss adjustment expense ratio	70.2	74.0	(3.8	) pts.	69.4	72.8	(3.4	) pts.
Underwriting expense ratio	19.7	19.2	0.5	pts.	19.8	19.7	0.1	pts.
Combined ratio	89.9	93.2	(3.3	) pts.	89.2	92.5	(3.3	) pts.
Commercial Lines
Loss & loss adjustment expense ratio	68.7	69.4	(0.7	) pts.	68.0	68.5	(0.5	) pts.
Underwriting expense ratio	20.0	22.2	(2.2	) pts.	20.5	22.1	(1.6	) pts.
Combined ratio	88.7	91.6	(2.9	) pts.	88.5	90.6	(2.1	) pts.
Property
Loss & loss adjustment expense ratio	79.9	63.6	16.3	pts.	68.0	61.5	6.5	pts.
Underwriting expense ratio2	36.7	34.9	1.8	pts.	35.9	36.0	(0.1	) pts.
Combined ratio2	116.6	98.5	18.1	pts.	103.9	97.5	6.4	pts.
Total Underwriting Operations3
Loss & loss adjustment expense ratio	70.4	73.1	(2.7	) pts.	69.2	72.0	(2.8	) pts.
Underwriting expense ratio	20.5	20.1	0.4	pts.	20.5	20.5	0	pts.
Combined ratio	90.9	93.2	(2.3	) pts.	89.7	92.5	(2.8	) pts.
Accident year loss & loss adjustment expense ratio4	70.1	73.7	(3.6	) pts.	68.6	71.4	(2.8	) pts.

¹ Ratios are expressed as a percentage of net premiums earned; fees and other revenues are netted with underwriting expenses in the ratio calculations.

² Included in the three and six months endedJune 30, 2018 are 5.8 points and 6.0 points, respectively, of amortization expense predominately associated with our acquisition of a controlling interest in ARX, and 6.5 points and 6.7 points for the respective periods last year. Excluding these additional expenses, for the three months ended June 30, 2018 and 2017, the Property business would have reported expense ratios of 30.9 and 28.4, respectively, and combined ratios of 110.8 and 92.0. For the six months ended June 30, 2018 and 2017, excluding these additional expenses, the Property business would have reported expense ratios of 29.9 and 29.3, respectively, and combined ratios of 97.9 and 90.8.

³ Combined ratios for the other indemnity businesses are not presented separately due to the low level of premiums earned by, and the variability of loss costs in, such businesses.

⁴ The accident year ratios include only the losses that occurred during the period noted. As a result, accident period results will change over time, either favorably or unfavorably, as we revise our estimates of loss costs when payments are made or reserves for that accident period are reviewed.

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Losses and Loss Adjustment Expenses (LAE)

	Three Months Ended June 30,				Six Months Ended June 30,
(millions)	2018		2017		2018		2017
Change in net loss and LAE reserves	$	585.7	$	334.0	$	860.9	$	545.5
Paid losses and LAE	4,789.6		4,280.9		9,385.2		8,332.8
Total incurred losses and LAE	$	5,375.3	$	4,614.9	$	10,246.1	$	8,878.3

Claims costs, our most significant expense, represent payments made, and estimated future payments to be made, to or on behalf of our policyholders, including expenses needed to adjust or settle claims. Claims costs are a function of loss severity and frequency and, for our vehicle businesses, are influenced by inflation and driving patterns, among other factors, some of which are discussed below. In our Property business, severity is primarily a function of construction costs and the age of the structure. Accordingly, anticipated changes in these factors are taken into account when we establish premium rates and loss reserves. Loss reserves are estimates of future costs and our reserves are adjusted as underlying assumptions change and information develops.

Our total loss and LAE ratio decreased 2.7 points for the second quarter 2018, compared to the second quarter 2017, and 2.8 points on a year-to-date basis, due to higher average premiums, lower auto frequency, and diligent expense management. In addition, our catastrophe losses, as a percentage of earned premiums, were lower for both the second quarter and first six months of 2018, compared to the same periods last year.

The following table shows our consolidated catastrophe losses, excluding loss adjustment expenses, incurred during the periods:

	Three Months Ended June 30,						Six Months Ended June 30,
($ in millions)	2018			2017			2018			2017
Vehicle businesses	$	124.9		$	162.0		$	150.4		$	223.4
Property business, net of reinsurance (excluding ASL)	122.8			132.2			147.4			225.1
Reinsurance recoverable on ASL1	(41.2		)	(58.6		)	(42.0		)	(101.9		)
Property business, net	81.6			73.6			105.4			123.2
Total net catastrophe losses incurred	$	206.5		$	235.6		$	255.8		$	346.6
Increase to combined ratio	2.7		pts.	3.7		pts.	1.7		pts.	2.8		pts.

¹ Represents the reinsurance recoverable recorded on the losses under our aggregate stop-loss agreements (ASL); see table below for further information.

In the second quarter 2018, approximately 70% of the catastrophe losses were due to wind and hail storms and flooding in Texas and Colorado. We have responded, and will continue to respond, promptly to catastrophic events when they occur in order to provide exemplary claims service to our customers.

We do not have catastrophe-specific reinsurance for our vehicle businesses. We reinsure most of our Property business against various risks, including, but not limited to, catastrophic losses through excess of loss reinsurance and an aggregate stop-loss agreement.

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The table above reports the reinsurance recoverables under our aggregate stop-loss agreements related to 2018 losses and development on 2017 losses. The aggregate stop-loss agreement for 2018 covers all accident year losses and allocated loss adjustment expenses (ALAE) that occur during 2018, except those from named storms and liability claims, and provides $200 million of coverage if ASI’s applicable loss and ALAE ratio for the full accident year were to exceed 63%. The aggregate stop-loss agreement for 2017 had substantially the same terms as the 2018 agreement. The following table shows the total reinsurance recoverables under the aggregate stop-loss agreement by accident year:

	Three Months Ended June 30,				Six Months Ended June 30,
($ in millions)	2018		2017		2018		2017
Reinsurance recoverables on losses
2018	$	37.7	$	—	$	37.7	$	—
2017	3.5		58.6		4.3		101.9
Total	41.2		58.6		42.0		101.9
Reinsurance recoverables on ALAE
2018	4.1		—		4.1		—
2017	0.5		6.2		0.5		11.0
Total	4.6		6.2		4.6		11.0
Total reinsurance recoverables
2018	41.8		—		41.8		—
2017	4.0		64.8		4.8		112.9
Total	$	45.8	$	64.8	$	46.6	$	112.9

During the second quarter 2018, we renewed about 40% of our catastrophe reinsurance coverage under similar terms as the prior coverage; the remainder is covered by multi-year contracts that are still in effect. Upon renewal, however, we increased our retention threshold for losses and LAE from a single catastrophic event to $60 million, compared to the $50 million retention level under the prior agreement. We believe that this increased retention level is appropriate given our growth in both premiums and regulatory capital.

The following discussion of our severity and frequency trends in our personal auto businesses excludes comprehensive coverage because of its inherent volatility, as it is typically linked to catastrophic losses generally resulting from adverse weather. Comprehensive coverage insures against damage to a customer’s vehicle due to various causes other than collision, such as windstorm, hail, theft, falling objects, and glass breakage.

Total personal auto incurred severity (i.e., average cost per claim, including both paid losses and the change in case reserves) on a calendar-year basis increased about 2% and 3% for the three and six months ended June 30, 2018, respectively, compared to the same periods last year. Following are the changes we experienced in severity in our auto coverages on a year-over-year basis:

• Collision increased about 6% and 7% for the second quarter and the first six months of 2018, respectively, in part due to an increase in the severity of total loss claims and higher costs to repair newer vehicles.

• Bodily injury and auto property damage both increased about 2% - 3% for both periods.

• Personal injury protection (PIP) decreased about 7% and 4% for the second quarter and the first six months of 2018, respectively.

It is a challenge to estimate future severity, especially for bodily injury and PIP claims, but we continue to monitor changes in the underlying costs, such as medical costs, health care reform, and jury verdicts, along with regulatory changes and other factors that may affect severity.

Our incurred frequency of auto accidents, on a calendar-year basis, decreased about 3% and 2% for the three and six months ended June 30, 2018, respectively, compared to the same periods last year. Following are our frequency changes by coverage on a year-over-year basis:

• PIP, auto property damage, and bodily injury decreased about 2% - 3% for both periods presented.

• Collision decreased about 2% and 1% for the second quarter and the first six months of 2018, respectively.

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We closely monitor the changes in frequency, but the degree or direction of near-term frequency change is not something that we are able to predict with any certainty. We analyze trends to distinguish changes in our experience from external factors, such as changes in the number of vehicles per household, miles driven, gasoline prices, advances in vehicle safety, and unemployment rates, versus those resulting from shifts in the mix of our business, to allow us to reserve more accurately for our loss exposures.

The table below presents the actuarial adjustments implemented and the loss reserve development experienced in the following periods on a companywide basis:

	Three Months Ended June 30,						Six Months Ended June 30,
($ in millions)	2018			2017			2018			2017
ACTUARIAL ADJUSTMENTS
Reserve decrease (increase)
Prior accident years	$	(7.0	)	$	45.5		$	(0.8	)	$	70.9
Current accident year	6.2			(2.9		)	13.9			(16.4		)
Calendar year actuarial adjustment	$	(0.8	)	$	42.6		$	13.1		$	54.5
PRIOR ACCIDENT YEARS DEVELOPMENT
Favorable (unfavorable)
Actuarial adjustment	$	(7.0	)	$	45.5		$	(0.8	)	$	70.9
All other development	(18.9		)	(8.5		)	(80.7		)	(145.1		)
Total development	$	(25.9	)	$	37.0		$	(81.5	)	$	(74.2	)
(Increase) decrease to calendar year combined ratio	(0.3		) pts.	0.6		pts.	(0.6		) pts.	(0.6		) pts.

Total development consists of both actuarial adjustments and “all other development.” The actuarial adjustments represent the net changes made by our actuarial staff to both current and prior accident year reserves based on regularly scheduled reviews. Through these reviews, our actuaries identify and measure variances in the projected frequency and severity trends, which allow them to adjust the reserves to reflect the current cost trends. For our Property business, 100% of the outstanding reserves are reviewed monthly and, as such, include any development on catastrophe losses as part of the actuarial adjustments. For the vehicle businesses, only a subset of our reserves is reviewed monthly as part of the actuarial adjustment process. Development for catastrophe losses for the vehicle businesses would be reflected in “all other development,” discussed below, to the extent they related to prior year reserves. We report these actuarial adjustments separately for the current and prior accident years to reflect these adjustments as part of the total prior accident years development.

“All other development” represents claims settling for more or less than reserved, emergence of unrecorded claims at rates different than anticipated in our incurred but not recorded (IBNR) reserves, and changes in reserve estimates on specific claims. Although we believe the development from both the actuarial adjustments and “all other development” generally results from the same factors, we are unable to quantify the portion of the reserve development that might be applicable to any one or more of those underlying factors.

Our objective is to establish case and IBNR reserves that are adequate to cover all loss costs, while incurring minimal variation from the date that the reserves are initially established until the losses are fully developed. See Note 6 – Loss and Loss Adjustment Expense Reserves, for a more detailed discussion of our prior accident years development. We continue to focus on our loss reserve analysis, attempting to enhance accuracy and to further our understanding of our loss costs.

Underwriting Expenses

Progressive’s underwriting expenses increased 24% for the second quarter and 20% for the first six months of 2018, compared to the same periods last year. Nevertheless, the underwriting expense ratio (i.e., policy acquisition costs and other underwriting expenses, net of fees and other revenues, expressed as a percentage of net premiums earned) was only 0.4 points higher for the second quarter 2018 and was flat for the first six months of 2018, in part reflecting the increase in earned premium per policy we realized during the same periods. The increase in advertising spend was the primary driver of the increase in total underwriting expenses. During the second quarter and first six months of 2018, our advertising expenditures increased 55% and 44%, respectively, compared to the same periods last year. We will continue to invest in advertising as long as we generate sales at a cost below the maximum amount we are willing to spend to acquire a new customer.

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C. Growth

For our underwriting operations, we analyze growth in terms of both premiums and policies. Net premiums written represent the premiums from policies written during the period, less any premiums ceded to reinsurers. Net premiums earned, which are a function of the premiums written in the current and prior periods, are earned as revenue over the life of the policy using a daily earnings convention. Policies in force, our preferred measure of growth since it removes the variability due to rate changes or mix shifts, represents all policies under which coverage was in effect as of the end of the period specified.

	Three Months Ended June 30,						Six Months Ended June 30,
($ in millions)	2018		2017		% Growth		2018		2017		% Growth
NET PREMIUMS WRITTEN
Personal Lines
Agency	$	3,384.6	$	2,916.4	16	%	$	6,719.9	$	5,737.1	17	%
Direct	3,268.3		2,681.7		22		6,677.8		5,474.3		22
Total Personal Lines	6,652.9		5,598.1		19		13,397.7		11,211.4		20
Commercial Lines	1,045.2		857.1		22		1,972.1		1,518.0		30
Property	397.2		290.9		37		694.3		507.7		37
Total underwriting operations	$	8,095.3	$	6,746.1	20	%	$	16,064.1	$	13,237.1	21	%
NET PREMIUMS EARNED
Personal Lines
Agency	$	3,225.7	$	2,752.5	17	%	$	6,289.5	$	5,384.0	17	%
Direct	3,211.8		2,650.0		21		6,228.1		5,173.7		20
Total Personal Lines	6,437.5		5,402.5		19		12,517.6		10,557.7		19
Commercial Lines	884.3		671.7		32		1,692.9		1,317.2		29
Property	312.4		239.1		31		597.7		465.1		29
Total underwriting operations	$	7,634.2	$	6,313.3	21	%	$	14,808.2	$	12,340.0	20	%
							June 30,
(thousands)							2018		2017		% Growth
POLICIES IN FORCE
Agency auto							6,107.4		5,350.3		14	%
Direct auto							6,650.9		5,692.6		17
Total auto							12,758.3		11,042.9		16
Special lines1							4,387.4		4,356.3		1
Personal Lines - total							17,145.7		15,399.2		11	%
Commercial Lines							678.9		625.7		9	%
Property							1,766.6		1,311.1		35	%

¹ Includes insurance for motorcycles, watercraft, RVs, and similar items.

During the first half of 2018, we added 1.4 million policies in force and added approximately 2.3 million since June 30, 2017. The increases reflect both an increase in new applications and lengthening retention.

Although new policies are necessary to maintain a growing book of business, we continue to recognize the importance of retaining our current customers as a critical component of our continued growth. As shown in the tables below, we measure retention by policy life expectancy. We disclose our changes in policy life expectancy using a trailing 12-month period, since we believe this measure is indicative of recent experience, mitigates the effects of month-to-month variability, and addresses seasonality. We also review our customer retention for our personal auto products using a trailing 3-month period. Although using a trailing 3-month measure does not address seasonality and can reflect more volatility, this measure is more responsive to current experience and can be an indicator of how our retention rates are moving.

To analyze growth, we review new policies, rate levels, and the retention characteristics of our segments.

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D. Personal Lines

The following table shows our year-over-year changes for our Personal Lines business:

	Growth Over Prior Year
	Quarter				Year-to-date
	2018		2017		2018		2017
APPLICATIONS
New	21	%	9	%	21	%	7	%
Renewal	9	%	6	%	10	%	6	%
WRITTEN PREMIUM PER POLICY - AUTO	5	%	6	%	5	%	6	%
RETENTION MEASURES - AUTO
Policy life expectancy
Trailing 3-months	5	%	4	%
Trailing 12-months	10	%	5	%

In our Personal Lines business, the increase in both new and renewal applications resulted from increases in our personal auto products. In the auto businesses, the increase in new applications was primarily attributable to our competitive product offerings and position in the marketplace and reflects our increase in advertising spend during the first half of 2018. For the second quarter 2018, on a year-over-year basis, our auto new applications were up 27% and our special lines products increase in new applications was 2%. For the first six months of 2018, auto new applications were up 26% and special lines saw a decrease of 1%. The Direct business contributed more to our auto growth for both periods, primarily due to lower new applications in the second quarter and first six months of 2017, following a reduction of our advertising spend during the second half of 2016. Rate increases taken in our auto businesses over the trailing 12-month period, in addition to a shift in business mix, contributed to the increase we experienced in written premium per policy for the second quarter and first six months of 2018. Our Destination Era efforts continue to have a positive impact on our retention.

We report our Agency and Direct business results separately as components of our Personal Lines segment to provide further understanding of our products by distribution channel.

The Agency Business

	Growth Over Prior Year
	Quarter				Year-to-date
	2018		2017		2018		2017
Auto: new applications	21	%	17	%	20	%	16	%
renewal applications	10	%	7	%	11	%	6	%
written premium per policy	5	%	6	%	5	%	6	%
Auto retention measures:
policy life expectancy - trailing 3-months	5	%	6	%
trailing 12-months	11	%	6	%

The Agency business includes business written by more than 35,000 independent insurance agencies that represent Progressive, as well as brokerages in New York and California. New and renewal applications increased during the second quarter and the six months ended June 30, 2018, primarily reflecting our competitiveness in the marketplace as a result of many of our competitors taking higher rate increases than we have over the trailing 12-month period. During the second quarter, we continued to experience new business application growth and strong policy in force growth in each of our consumer segments (e.g., inconsistently insured, consistently insured and maybe a renter, homeowners who do not bundle auto and home, and homeowners who bundle auto and home) with the largest increase coming from our bundled auto and home product (i.e., Robinsons), albeit on a smaller base. During the year, we generated new auto application growth in 45 states, including nine of our top 10 largest Agency states.

We have continued to see an increase in demand from agents as evidenced by about a 5% increase in quote volume during the second quarter and first six months of 2018, compared to the same periods last year. Our Agency auto rate of conversion (i.e., converting a quote to a sale) increased about 14% for both the second quarter and the six months ended June 30, 2018, compared to last year. Written premium per policy for new and renewal Agency auto business increased 5% for the second quarter and first six months of 2018, as compared to the same periods last year, primarily reflecting rate increases previously discussed.

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The Direct Business

	Growth Over Prior Year
	Quarter				Year-to-date
	2018		2017		2018		2017
Auto: new applications	32	%	8	%	31	%	3	%
renewal applications	13	%	8	%	13	%	9	%
written premium per policy	5	%	5	%	5	%	6	%
Auto retention measures:
policy life expectancy - trailing 3-months	4	%	1	%
trailing 12-months	9	%	2	%

The Direct business includes business written directly by Progressive on the Internet, through mobile devices, and over the phone. During the year, we generated new Direct auto application growth in 49 states, including all of our top 10 largest Direct states. New and renewal applications increased during the second quarter and the six months ended June 30, 2018, primarily reflecting our competitiveness in the marketplace. In addition, we increased our advertising spend, on a year-over-year basis, for the second quarter and the first six months of 2018, which helped drive new business growth and also contributed to the total increase in our Direct business expense ratios during both periods.

Similar to our Agency business, during the second quarter, we continued to grow our new Direct auto applications double digits across all consumer segments and, with the marketing investments that continued to target auto/home bundlers, we saw the greatest growth in our Robinsons consumer segment. Our Direct auto quote volume increased 15% and 12%, on a year-over-basis, for the second quarter and first six months of 2018, respectively, and the rate of conversion increased about 16% for the second quarter and 18% for the six months ended June 30, 2018, compared to last year. Written premium per policy for new and renewal Direct auto business increased 4% and 5%, respectively, for the second quarter 2018, and 4% and 5%, for the first six months, as compared to the same periods last year, primarily reflecting rate increases previously discussed.

E. Commercial Lines

	Growth Over Prior Year
	Quarter				Year-to-date
	2018		2017		2018		2017
New applications	9	%	(4	)%	17	%	(12	)%
Renewal applications	5	%	10	%	4	%	10	%
Written premium per policy	12	%	11	%	13	%	8	%
Policy life expectancy - trailing 12-months	2	%	0	%

Our Commercial Lines business operates in the business auto, for-hire transportation, contractor, for-hire specialty, tow, and for-hire livery markets and is primarily written in the agency channel. Commercial Lines experienced solid year-over-year new application growth in the second quarter and first six months of 2018, reflecting increased quote volume, a generally strong economy and limited options for commercial auto customers and agents. We continue to monitor the growth and profitability across all of our business market targets and will impose underwriting restrictions when we believe it is necessary to meet our profitability objectives. We removed a number of underwriting restrictions early in the second quarter 2018; however, some truck underwriting restrictions remain in select markets.

During 2018, we added three additional states bringing the total to four states where we insure transportation network company business. Albeit from a smaller base, the net premiums earned on this business during the second quarter 2018 are up nearly 120% from the first quarter 2018. We continued to increase our understanding of the pricing for this product and may increase the number of states where we provide coverage. We have also seen greater market acceptance of Smart Haul^®, our usage-based insurance program for our for-hire transportation policyholders. With the enforcement of the federal electronic logging device mandate, we believe we are well positioned to offer competitive rates to the best owners/operators and small fleets.

During the three and six months ended June 30, 2018, we increased rates and experienced shifts in business mix, which contributed to the increase in our written premium per policy. Despite higher rates, the increase in policy life expectancy was primarily attributable to a shift in business mix and competitors taking higher rate increases.

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F. Property

	Growth Over Prior Year
	Quarter				Year-to-date
	2018		2017		2018		2017
New applications	81	%	35	%	83	%	33	%
Renewal applications	21	%	19	%	20	%	20	%
Written premium per policy	(5	)%	(7	)%	(5	)%	(8	)%

Our Property business writes residential property insurance for homeowners, other property owners, and renters, primarily in the agency channel. The significant growth in new applicationsis attributable to state expansion that occurred during the last 12 months in both Property business written by ARX and Progressive’s renters business, more competitive product offerings, as well as momentum in growing Robinsons through our Platinum agency offering.

In addition, the Property growth is benefiting from HomeQuote Explorer^®, our direct online homeowner insurance shopping experience that was launched in March 2017. During the second quarter 2018, ASI began offering the ability to buy Progressive Home online through the HQX platform. The online buy button functionality is currently offered in one state and we plan to expand to other states over time.

The decrease in premium per policy continues to reflect a relatively higher percentage of renters policies, which have lower premiums per policy. Our core Property policies (e.g., home and condo insurance) had a slight increase in written premiums per policy for both periods on a year-over-year basis.

G. Income Taxes

A deferred tax asset or liability is a tax benefit or expense that is expected to be realized in a future tax year. At June 30, 2018 and 2017, and December 31, 2017, we reported net deferred tax liabilities. At June 30, 2018 and 2017, and December 31, 2017, we had net current income taxes payable of $60.5 million, $17.9 million, and $23.8 million, respectively, which were reported as part of “other liabilities.”

Our effective tax rate was 20% for the second quarter and first six months of 2018, compared to 33% for the same periods last year. The decrease primarily reflects the reduction in the federal corporate income tax rate to 21%, from the previous rate of 35%, under the legislation commonly known as the Tax Cuts and Jobs Act of 2017. See Note 5 – Income Taxes for further discussion.

There were no material changes in our uncertain tax positions during the three months ended June 30, 2018.

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IV. RESULTS OF OPERATIONS – INVESTMENTS

A. Investment Results

We report total return to reflect our management philosophy governing the portfolio and our evaluation of investment results. The fully taxable equivalent (FTE) total return includes recurring investment income, adjusted to a fully taxable amount for certain securities that receive preferential tax treatment (e.g., municipal securities), and total net realized, and changes in total net unrealized, gains (losses) on securities.

Our investment portfolio produced an FTE total return of 0.6% for the three months ended June 30, 2018, compared to 1.3% for the same period in 2017. Our fixed-income and common stock portfolios had FTE total returns of 0.3% and 3.1%, respectively, for the three months ended June 30, 2018, and 1.1% and 3.5%, respectively, for the same period in 2017. Interest rates rose during the quarter. However, we did not change our fixed-income portfolio duration of 2.6 years.  We generated a small positive return in the fixed-income portfolio this quarter as coupon income was able to offset the rise in interest rates and mixed spread movements across sectors. The equity market rebounded from its first quarter drop and ended the second quarter higher year-to-date. Our indexed portfolio return was in line with the overall market, while our actively managed portfolio lagged with a negative return.

The following summarizes investment results for the periods ended June 30:

	Three Months				Six Months
	2018		2017		2018		2017
Pretax recurring investment book yield (annualized)	2.7	%	2.3	%	2.6	%	2.3	%
Weighted average FTE book yield (annualized)	2.8	%	2.5	%	2.7	%	2.6	%
FTE total return:
Fixed-income securities	0.3	%	1.1	%	0	%	2.2	%
Common stocks	3.1	%	3.5	%	2.7	%	9.8	%
Total portfolio	0.6	%	1.3	%	0.3	%	3.1	%

A further break-down of our FTE total returns for our portfolio, including any net gains (losses) on our derivative positions, for the periods ended June 30, follows: 

	Three Months				Six Months
	2018		2017		2018		2017
Fixed-income securities:
U.S. Treasury Notes	0	%	0.8	%	(0.7	)%	1.4	%
Municipal bonds	0.8	%	1.6	%	0.6	%	3.4	%
Corporate bonds	0.3	%	1.0	%	(0.3	)%	2.0	%
Residential mortgage-backed securities	0.6	%	1.7	%	1.1	%	2.8	%
Commercial mortgage-backed securities	0.5	%	1.5	%	0.5	%	2.8	%
Other asset-backed securities	0.5	%	0.5	%	0.7	%	1.0	%
Preferred stocks	0.5	%	4.2	%	0.5	%	9.6	%
Short-term investments	0.5	%	0.3	%	0.9	%	0.5	%
Common stocks:
Indexed	3.4	%	3.4	%	2.8	%	10.0	%
Actively managed	(1.5	)%	5.3	%	2.3	%	7.5	%

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B. Portfolio Allocation

The composition of the investment portfolio was:

($ in millions)	Fair Value		% of Total Portfolio		Duration (years)	Rating1
June 30, 2018
Fixed maturities	$	23,789.2	76.9	%	2.9	AA-
Nonredeemable preferred stocks	758.6		2.4		3.1	BBB-
Short-term investments	3,231.2		10.5		0.1	AA-
Total fixed-income securities	27,779.0		89.8		2.6	AA-
Common equities	3,142.2		10.2		na	na
Total portfolio2,3	$	30,921.2	100.0	%	2.6	AA-
June 30, 2017
Fixed maturities	$	18,388.1	70.8	%	2.6	A+
Nonredeemable preferred stocks	783.1		3.0		3.6	BBB-
Short-term investments	3,729.7		14.4		<0.1	AA
Total fixed-income securities	22,900.9		88.2		2.3	A+
Common equities	3,077.5		11.8		na	na
Total portfolio2,3	$	25,978.4	100.0	%	2.3	A+
December 31, 2017
Fixed maturities	$	20,201.7	74.1	%	2.8	AA-
Nonredeemable preferred stocks	803.8		2.9		3.3	BBB-
Short-term investments	2,869.4		10.5		<0.1	AA-
Total fixed-income securities	23,874.9		87.5		2.5	AA-
Common equities	3,399.8		12.5		na	na
Total portfolio2,3	$	27,274.7	100.0	%	2.5	AA-
na = not applicable

¹Represents ratings at period end. Credit quality ratings are assigned by nationally recognized statistical rating organizations. To calculate the weighted average credit quality ratings, we weight individual securities based on fair value and assign a numeric score of 0-5, with non-investment-grade and non-rated securities assigned a score of 0-1. To the extent the weighted average of the ratings falls between AAA and AA+, we would assign an internal rating of AAA-.

²Our portfolio reflects the effect of unsettled security transactions; at June 30, 2018 and 2017, we had $362.1 million and $287.1 million, respectively, included in “other liabilities,” compared to $5.8 million included in “other assets” at December 31, 2017.

³The total fair value of the portfolio at June 30, 2018 and 2017, and December 31, 2017, included $1.7 billion, $1.1 billion, and $1.6 billion, respectively, of securities held in a consolidated, non-insurance subsidiary of the holding company, net of any unsettled security transactions.

Our asset allocation strategy is to maintain 0%-25% of our portfolio in Group I securities, with the balance (75%-100%) of our portfolio in Group II securities.

We define Group I securities to include:

• common equities

• nonredeemable preferred stocks

• redeemable preferred stocks, except for 50% of investment-grade redeemable preferred stocks with cumulative dividends, which are included in Group II, and

• all other non-investment-grade fixed-maturity securities.

Group II securities include:

• short-term securities, and

• all other fixed-maturity securities, including 50% of the investment-grade redeemable preferred stocks with cumulative dividends.

We believe this asset allocation strategy allows us to appropriately assess the risks associated with these securities for capital purposes and is in line with the treatment by our regulators.

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The following table shows the composition of our Group I and Group II securities:

	June 30, 2018				June 30, 2017				December 31, 2017
($ in millions)	Fair Value		% of Total Portfolio		Fair Value		% of Total Portfolio		Fair Value		% of Total Portfolio
Group I securities:
Non-investment-grade fixed maturities	$	802.2	2.6	%	$	387.6	1.5	%	$	404.8	1.5	%
Redeemable preferred stocks1	156.3		0.5		144.5		0.6		147.4		0.5
Nonredeemable preferred stocks	758.6		2.4		783.1		3.0		803.8		2.9
Common equities	3,142.2		10.2		3,077.5		11.8		3,399.8		12.5
Total Group I securities	4,859.3		15.7		4,392.7		16.9		4,755.8		17.4
Group II securities:
Other fixed maturities2	22,830.7		73.8		17,856.0		68.7		19,649.5		72.1
Short-term investments	3,231.2		10.5		3,729.7		14.4		2,869.4		10.5
Total Group II securities	26,061.9		84.3		21,585.7		83.1		22,518.9		82.6
Total portfolio	$	30,921.2	100.0	%	$	25,978.4	100.0	%	$	27,274.7	100.0	%

¹Includes non-investment-grade redeemable preferred stocks of $83.5 million, $82.3 million, and $83.8 million at June 30, 2018 and 2017, and December 31, 2017, respectively.

²Includes investment-grade redeemable preferred stocks, with cumulative dividends, of $72.8 million, $62.2 million, and $63.6 million at June 30, 2018 and 2017, and December 31, 2017, respectively.

To determine the allocation between Group I and Group II, we use the credit ratings from models provided by the National Association of Insurance Commissioners (NAIC) for classifying our residential and commercial mortgage-backed securities, excluding interest-only securities, and the credit ratings from nationally recognized statistical rating organizations (NRSRO) for all other debt securities. NAIC ratings are based on a model that considers the book price of our securities when assessing the probability of future losses in assigning a credit rating. As a result, NAIC ratings can vary from credit ratings issued by NRSROs. Management believes NAIC ratings more accurately reflect our risk profile when determining the asset allocation between Group I and Group II securities.

Unrealized Gains and Losses

As of June 30, 2018, our fixed-maturity portfolio had pretax net unrealized losses, recorded as part of accumulated other comprehensive income, of $267.3 million, compared to net unrealized gains of $73.3 million at June 30, 2017 and net unrealized losses of $8.4 million at December 31, 2017. The changes for both periods reflect valuation declines in nearly all sectors during the first six months of 2018, most notably in our U.S. Treasury and corporate portfolios, partially offset by net realized losses on sales of securities primarily in our U.S. Treasury portfolio.

See Note 2 – Investments for a further break-out of our gross unrealized gains and losses.

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Holding Period Gains and Losses

The following table provides the inception-to-date gross and net holding period gains (losses) for our hybrid fixed-maturity securities and our equity securities as of June 30, 2018:

(millions)	Gross Holding Period Gains		Gross Holding Period Losses			Net Holding Period Gains (Losses)
Hybrid fixed maturities:
State and local government obligations	$	0	$	0		$	0
Corporate debt securities	0		(2.0		)	(2.0		)
Other asset-backed securities	0.1		0			0.1
Redeemable preferred stocks	0		(3.4		)	(3.4		)
Total hybrid fixed maturities	0.1		(5.4		)	(5.3		)
Equity securities:
Nonredeemable preferred stocks	92.8		(11.2		)	81.6
Common equities	1,836.5		(8.3		)	1,828.2
Total equity securities	1,929.3		(19.5		)	1,909.8
Total holding period securities at June 30, 2018	$	1,929.4	$	(24.9	)	$	1,904.5
Total holding period securities at June 30, 20171	$	1,738.5	$	(13.1	)	$	1,725.4
Total holding period securities at December 31, 20171	$	2,015.6	$	(9.4	)	$	2,006.2

¹For comparative purposes, the holding period securities at June 30, 2017 and December 31, 2017 include the hybrid fixed maturities with holding period gains (losses) and the equity securities with unrealized gains (losses).

Other-Than-Temporary Impairment (OTTI)

Net realized gains (losses) may include write-downs of securities determined to have had other-than-temporary declines in fair value. In light of the new accounting guidance effective for 2018, we no longer need to analyze our equity securities for OTTI.

We routinely monitor our fixed-maturity portfolio for pricing changes that might indicate potential impairments and perform detailed reviews of securities with unrealized losses. In such cases, changes in fair value are evaluated to determine the extent to which such changes are attributable to: (i) fundamental factors specific to the issuer, such as financial conditions, business prospects, or other factors, (ii) market-related factors, such as interest rates or equity market declines (e.g., negative return at either a sector index level or at the broader market level), or (iii) credit-related losses, where the present value of cash flows expected to be collected is lower than the amortized cost basis of the security.

Fixed-maturity securities with declines attributable to issuer-specific fundamentals are reviewed to identify available evidence, circumstances, and influences to estimate the potential for, and timing of, recovery of the investment’s impairment. An other-than-temporary impairment loss is deemed to have occurred when the potential for recovery does not satisfy the criteria set forth in the current accounting guidance.

When a security in our fixed-maturity portfolio has an unrealized loss and it is more likely than not that we will be required to sell the security, we write-down the security to its current fair value and recognize the entire unrealized loss through the comprehensive income statement as a realized loss. If a fixed-maturity security has an unrealized loss and it is more likely than not that we will hold the debt security until recovery (which could be maturity), then we determine if any of the decline in value is due to a credit loss (i.e., where the present value of cash flows expected to be collected is lower than the amortized cost basis of the security) and, if so, we will recognize that portion of the impairment in net income as part of the comprehensive income statement as a realized loss; any remaining unrealized loss on the security is considered to be due to other factors (e.g., interest rate and credit spread movements) and is reflected in other comprehensive income as part of shareholders’ equity, along with unrealized gains or losses on securities that are not deemed to be other-than-temporarily impaired.

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The write-down activity recorded in the comprehensive income statements was as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
(millions)	Total Write-downs		Write-downs on Securities Sold		Write-downs on Securities Held at Period End		Total Write-downs		Write-downs on Securities Sold		Write-downs on Securities Held at Period End
2018
Common equities	$	0	$	0	$	0	$	0	$	0	$	0
Total investment portfolio	0		0		0		0		0		0
Other assets1	11.1		0		11.1		11.1		0		11.1
Total write-downs	$	11.1	$	0	$	11.1	$	11.1	$	0	$	11.1
2017
Common equities	$	2.6	$	0	$	2.6	$	3.6	$	0	$	3.6
Total investment portfolio	2.6		0		2.6		3.6		0		3.6
Other assets1	11.2		0		11.2		11.2		0		11.2
Total write-downs	$	13.8	$	0	$	13.8	$	14.8	$	0	$	14.8

¹Reflects an impairment of a renewable energy investment under which the future pretax cash flows are expected to be less than the carrying value of the asset.

The following table stratifies the gross unrealized losses in our fixed-maturity portfolio at June 30, 2018, by duration in a loss position and magnitude of the loss as a percentage of the cost of the security:

			Total Gross Unrealized Losses		Decline of Investment Value
(millions)	Fair Value				>15%		>25%		>35%		>45%
Fixed maturity:
Unrealized loss for less than 12 months	$	14,234.4	$	181.9	$	0.1	$	0.1	$	0.1	$	0
Unrealized loss for 12 months or greater	5,664.3		122.2		0		0		0		0
Total	$	19,898.7	$	304.1	$	0.1	$	0.1	$	0.1	$	0

We completed a thorough review of the existing securities in these loss categories and determined that, applying the procedures and criteria discussed above, these securities were not other-than-temporarily impaired. We also determined that it is more likely that we will not be required to sell these securities, for the periods of time necessary to recover the respective cost bases of these securities, and that there are no additional credit-related impairments on our debt securities.

Since total unrealized losses are already a component of other comprehensive income and included in shareholders’ equity, any recognition of these losses as additional OTTI losses would have no effect on our comprehensive income, book value, or reported investment total return.

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Fixed-Income Securities

The fixed-income portfolio is managed internally and includes fixed-maturity securities, short-term investments, and nonredeemable preferred stocks. A primary exposure for the fixed-income portfolio is interest rate risk, which includes the change in value resulting from movements in the underlying market rates of debt securities held. We manage this risk by maintaining the portfolio’s duration (a measure of the portfolio’s exposure to changes in interest rates) between 1.5 and 5 years. The duration of the fixed-income portfolio was 2.6 years at June 30, 2018, compared to 2.3 years at June 30, 2017 and 2.5 years at December 31, 2017. The change from June 30, 2017 through June 30, 2018 reflects our proactive monitoring and reacting to the changing interest rate environment while maintaining a conservative duration position to limit potential declines in portfolio value from increases in rates. The distribution of duration and convexity (i.e., a measure of the speed at which the duration of a security is expected to change based on a rise or fall in interest rates) is monitored on a regular basis.

The duration distribution of our fixed-income portfolio, excluding short-term investments, represented by the interest rate sensitivity of the comparable benchmark U.S. Treasury Notes, was:

Duration Distribution	June 30, 2018		June 30, 2017		December 31, 2017
1 year	21.9	%	24.1	%	19.8	%
2 years	18.1		14.5		15.7
3 years	24.9		25.9		27.0
5 years	19.3		24.3		24.1
7 years	10.2		8.0		8.7
10 years	5.6		3.3		4.7
20 years	0		(0.1	)	0
30 years	0		0		0
Total fixed-income portfolio	100.0	%	100.0	%	100.0	%

The negative duration in the 20-year category at June 30, 2017 arose from the variable rate nature of the dividends on some of our preferred stocks. If not called at their call dates, the dividends on these securities would reset from a fixed rate to a lower floating rate, which could cause these securities to trade at a discount and, therefore, with a negative duration as the securities’ valuation would likely rise if the floating rate moves higher.

Another primary exposure related to the fixed-income portfolio is credit risk. This risk is managed by maintaining an A+ minimum weighted average portfolio credit quality rating, as defined by NRSROs, which was successfully maintained during the first six months of 2018 and all of 2017.

The credit quality distribution of the fixed-income portfolio was:

Rating	June 30, 2018		June 30, 2017		December 31, 2017
AAA	47.3	%	40.8	%	45.8	%
AA	11.7		17.7		13.6
A	11.1		12.1		12.2
BBB	24.7		24.6		23.2
Non-investment grade/non-rated1
BB	3.3		3.4		3.6
B	1.5		0.7		1.0
CCC and lower	0.1		0.1		0.1
Non-rated	0.3		0.6		0.5
Total fixed-income portfolio	100.0	%	100.0	%	100.0	%

¹The ratings in the table above are assigned by NRSROs. The non-investment-grade fixed-income securities based upon our Group I classification represented 3.9% of the total fixed-income portfolio at June 30, 2018, compared to 3.3% at June 30, 2017 and 2.6% at December 31, 2017.

The changes in credit quality profile from June 30, 2017 were the result of transactions in our portfolio that shifted the mix within the various credit categories.

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Our portfolio is also exposed to concentration risk. Our investment constraints limit investment in a single issuer, other than U.S. Treasury Notes or a state’s general obligation bonds, to 2.5% of shareholders’ equity, while the single issuer guideline on preferred stocks and/or non-investment-grade debt is 1.25% of shareholders’ equity. Additionally, the guideline applicable to any state’s general obligation bonds is 6% of shareholders’ equity. We also consider sector concentration a risk, and we frequently evaluate the portfolio’s sector allocation with regard to internal requirements and external market factors. We consider concentration risk both overall and in the context of individual asset classes, including but not limited to common equities, residential and commercial mortgage-backed securities, municipal bonds, and high-yield bonds. We were within all of the constraints described above during all reported periods.

We monitor prepayment and extension risk, especially in our structured product and preferred stock portfolios. Prepayment risk includes the risk of early redemption of security principal that may need to be reinvested at less attractive rates. Extension risk includes the risk that a security will not be redeemed when anticipated, and that the security that is extended will have a lower yield than a security we might be able to obtain by reinvesting the expected redemption principal. Our holdings of different types of structured debt and preferred securities help manage this risk. During the first six months of 2018 and all of 2017, we did not experience significant prepayment or extension of principal relative to our cash flow expectations in the portfolio.

Liquidity risk is another risk factor we monitor. Our overall portfolio remains very liquid and we believe that it is sufficient to meet expected near-term liquidity requirements. The short-to-intermediate duration of our portfolio provides a source of liquidity, as we expect approximately $1.7 billion, or 10.4%, of principal repayment from our fixed-income portfolio, excluding U.S. Treasury Notes and short-term investments, during the remainder of 2018. Cash from interest and dividend payments provides an additional source of recurring liquidity.

The duration of our U.S. government obligations, which are included in the fixed-income portfolio, was comprised of the following at June 30, 2018:

($ in millions)	Fair Value		Duration (years)
U.S. Treasury Notes
Less than one year	$	217.2	0.4
One to two years	1,563.6		1.5
Two to three years	1,723.1		2.4
Three to five years	2,982.4		3.9
Five to seven years	594.2		5.9
Seven to ten years	784.9		8.3
Total U.S. Treasury Notes	$	7,865.4	3.6

As of June 30, 2018, we had no interest rate swaps or treasury futures.

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ASSET-BACKED SECURITIES

Included in the fixed-income portfolio are asset-backed securities, which were comprised of the following at the balance sheet dates listed:

($ in millions)	Fair Value		Net Unrealized Gains (Losses)			% of Asset- Backed Securities		Duration (years)	Rating (at period end)
June 30, 2018
Residential mortgage-backed securities:
Collateralized mortgage obligations	$	444.9	$	(2.1	)	6.7	%	1.1	AA
Home equity (sub-prime bonds)	377.7		5.1			5.6		0.3	BBB+
Residential mortgage-backed securities	822.6		3.0			12.3		0.7	A+
Commercial mortgage-backed securities	2,696.9		(28.6		)	40.3		2.7	A+
Other asset-backed securities:
Automobile	1,358.6		(4.7		)	20.3		0.9	AAA-
Credit card	513.8		(0.2		)	7.6		0.9	AAA
Student loan	521.8		(0.6		)	7.8		1.0	AA
Other1	783.4		(6.2		)	11.7		1.7	AA-
Other asset-backed securities	3,177.6		(11.7		)	47.4		1.1	AA+
Total asset-backed securities	$	6,697.1	$	(37.3	)	100.0	%	1.7	AA-

($ in millions)	Fair Value		Net Unrealized Gains (Losses)			% of Asset- Backed Securities		Duration (years)	Rating (at period end)
June 30, 2017
Residential mortgage-backed securities:
Collateralized mortgage obligations	$	715.4	$	(1.6	)	11.0	%	0.8	A
Home equity (sub-prime bonds)	552.2		6.6			8.5		0.3	BBB
Residential mortgage-backed securities	1,267.6		5.0			19.5		0.6	A-
Commercial mortgage-backed securities	2,375.0		10.1			36.6		3.6	A
Other asset-backed securities:
Automobile	1,288.7		(0.5		)	19.9		0.6	AAA-
Credit card	366.4		(0.1		)	5.6		0.4	AAA
Student loan	609.4		4.7			9.4		1.2	AA-
Other1	582.9		(0.2		)	9.0		2.2	AA-
Other asset-backed securities	2,847.4		3.9			43.9		1.0	AA+
Total asset-backed securities	$	6,490.0	$	19.0		100.0	%	1.9	A+

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($ in millions)	Fair Value		Net Unrealized Gains (Losses)			% of Asset- Backed Securities		Duration (years)	Rating (at period end)
December 31, 2017
Residential mortgage-backed securities:
Collateralized mortgage obligations	$	404.3	$	0		6.7	%	1.1	A+
Home equity (sub-prime bonds)	432.4		7.9			7.1		0.2	BBB+
Residential mortgage-backed securities	836.7		7.9			13.8		0.7	A-
Commercial mortgage-backed securities	2,758.6		(1.5		)	45.6		2.9	A
Other asset-backed securities:
Automobile	1,182.2		(1.8		)	19.5		0.7	AAA-
Credit card	95.8		(0.1		)	1.6		0.5	AAA
Student loan	538.7		2.3			8.9		1.1	AA-
Other1	638.0		(0.4		)	10.6		2.2	A+
Other asset-backed securities	2,454.7		0			40.6		1.2	AA+
Total asset-backed securities	$	6,050.0	$	6.4		100.0	%	1.9	A+

¹Includes equipment leases, whole business securitizations, and other types of structured debt.

The increase in asset-backed securities since December 31, 2017, is primarily due to purchases in the other asset-backed sector partially offset by maturities in the residential mortgage-backed sector and sales and maturities in the commercial mortgage-backed sector. See below for a further discussion of our residential and commercial mortgage-backed securities. The other asset-backed securities category is not included in the discussions below due to the high credit quality, short duration, and security structure of those instruments.

Residential Mortgage-Backed Securities (RMBS) The following table details the credit quality rating and fair value of our RMBSs, along with the loan classification and a comparison of the fair value at June 30, 2018, to our original investment value (adjusted for returns of principal, amortization, and write-downs):

Residential Mortgage-Backed Securities (at June 30, 2018)
				Collateralized Mortgage Obligations
($ in millions) Rating1	Home Equity			Agency Pass-Through			Non-Agency Prime			Alt-A2			Government/GSE3			Total			% of Total
AAA	$	35.7		$	30.1		$	221.8		$	6.8		$	50.2		$	344.6		41.9	%
AA	77.8			0			22.2			22.9			0.8			123.7			15.0
A	109.2			0			3.6			0			0			112.8			13.7
BBB	33.0			0			8.6			0			0			41.6			5.1
Non-investment grade/non-rated:
BB	36.7			0			3.3			1.9			0			41.9			5.1
B	48.0			0			2.8			0.8			0			51.6			6.3
CCC and lower	13.6			0			6.3			0			0			19.9			2.4
Non-rated	23.7			0			14.9			47.9			0			86.5			10.5
Total fair value	$	377.7		$	30.1		$	283.5		$	80.3		$	51.0		$	822.6		100.0	%
Increase (decrease) in value	1.4		%	(4.0		)%	(0.4		)%	2.4		%	(3.0		)%	0.4		%

¹The credit quality ratings in the table above are assigned by NRSROs; when we assign the NAIC ratings for our RMBSs, $177.8 million of our non-investment-grade securities are rated investment-grade and classified as Group II and $22.1 million, or 2.7% of our total RMBSs, are not rated by the NAIC and are classified as Group I.

²Represents structured securities with primary residential loans as collateral for which documentation standards for loan approval were less stringent than conventional loans; the collateral loans are often referred to as low documentation or no documentation loans.

³The securities in this category are insured by a Government Sponsored Entity (GSE) and/or collateralized by mortgage loans insured by the Federal Housing Administration (FHA) or the U.S. Department of Veteran Affairs (VA).

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Our collateralized mortgage obligation (CMO) portfolio is primarily composed of non-GSE/FHA/VA mortgage securities.  The majority of our portfolio consists of older deals with predictable prepayment speeds, high levels of subordination, and stable delinquency trends.  During the second quarter 2018, we purchased well-structured older vintage and new issue positions backed by high quality collateral. Our home-equity loan-backed security portfolio decreased in value during the quarter due to repayments of principal.

Commercial Mortgage-Backed Securities (CMBS) The following table details the credit quality rating and fair value of our CMBSs, along with a comparison of the fair value at June 30, 2018, to our original investment value (adjusted for returns of principal, amortization, and write-downs):

Commercial Mortgage-Backed Securities (at June 30, 2018)
($ in millions) Rating1	Multi-Borrower			Single-Borrower			Total			% of Total
AAA	$	242.8		$	481.2		$	724.0		26.9	%
AA	34.2			630.4			664.6			24.6
A	0			464.4			464.4			17.2
BBB	0			631.9			631.9			23.4
Non-investment grade/non-rated:
BB	14.4			168.2			182.6			6.8
B	0.8			28.6			29.4			1.1
Total fair value	$	292.2		$	2,404.7		$	2,696.9		100.0	%
Increase (decrease) in value	(0.1		)%	(1.2		)%	(1.0		)%

¹The credit quality ratings in the table above are assigned by NRSROs; when we assign the NAIC ratings for our CMBSs, $180.4 million of our non-investment-grade securities are rated investment-grade and classified as Group II and $31.6 million, or 1.2% of our total CMBSs, are not rated by the NAIC and are classified as Group I.

During the quarter, we continued to focus on single-borrower CMBS, which represented 89.2% of the portfolio at June 30, 2018, because we believed these transactions provided an opportunity to select investments based on real estate and underwriting criteria that fit our preferred credit risk and duration profile. Our multi-borrower, fixed-rate CMBS portfolio is concentrated in vintages with conservative underwriting. During the quarter, we increased our CMBS bond portfolio by $435.7 million on a cost basis. We increased the duration in our CMBS portfolio from 2.4 to 2.7 years during the quarter as new issue fixed-rate securities were added. The average credit quality was A+ at June 30, 2018, compared to A at March 31, 2018.

MUNICIPAL SECURITIES

Included in the fixed-income portfolio at June 30, 2018 and 2017, and December 31, 2017, were $1,667.3 million, $2,500.1 million, and $2,297.1 million, respectively, of state and local government obligations. These securities had a duration of 2.7 years at June 30, 2018, compared to 2.9 years at June 30, 2017 and 2.7 years at December 31, 2017; the weighted average credit quality rating (excluding the benefit of credit support from bond insurance) was AA for all three periods. These securities had net unrealized losses of $11.6 million at June 30, 2018, compared to net unrealized gains of $26.6 million at June 30, 2017 and $11.4 million at December 31, 2017.

The following table details the credit quality rating of our municipal securities at June 30, 2018, without the benefit of credit or bond insurance:

Municipal Securities (at June 30, 2018)
(millions) Rating	General Obligations		Revenue Bonds		Total
AAA	$	228.4	$	395.8	$	624.2
AA	352.9		558.1		911.0
A	1.0		98.4		99.4
BBB	29.9		2.8		32.7
Total	$	612.2	$	1,055.1	$	1,667.3

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Included in revenue bonds were $786.3 million of single family housing revenue bonds issued by state housing finance agencies, of which $562.4 million were supported by individual mortgages held by the state housing finance agencies and $223.9 million were supported by mortgage-backed securities. Of the programs supported by mortgage-backed securities, approximately 25% were collateralized by Fannie Mae and Freddie Mac mortgages; the remaining 75% were collateralized by Ginnie Mae loans, which are fully guaranteed by the U.S. government. Of the programs supported by individual mortgages held by the state housing finance agencies, the weighted average credit quality rating was AA+. Most of these mortgages were supported by FHA, VA, or private mortgage insurance providers.

We reduced our holdings of tax-exempt municipal bonds during 2018, with the majority of the sales occurring during the first quarter. The new corporate tax rate we use to value our tax-exempt holdings rendered these bonds less attractive relative to alternative taxable investments. At current valuations, we expect to hold the majority of our housing bonds and bonds we hold for premium tax abatement purposes, in addition to other bonds that for credit or structural reasons we still find attractive.

CORPORATE SECURITIES

Included in our fixed-income securities at June 30, 2018 and 2017, and December 31, 2017, were $7,330.3 million, $5,013.8 million, and $4,997.7 million, respectively, of corporate securities. These securities had a duration of 3.3 years at June 30, 2018, compared to 2.4 years at June 30, 2017 and 2.6 years at December 31, 2017, and a weighted average credit quality rating of BBB for all three periods. These securities had net unrealized losses of $90.1 million at June 30, 2018, compared to net unrealized gains of $21.8 million at June 30, 2017 and $0.4 million at December 31, 2017.

Our allocation to corporate bonds increased during the second quarter as we took advantage of market volatility to add to the portfolio and increase duration at attractive levels.

The table below shows the exposure break-down by sector and rating: 

Corporate Securities (at June 30, 2018)
(millions) Rating	Consumer		Industrial		Communication		Financial Services		Agency		Technology		Basic Materials		Energy		Total
AAA	$	0	$	0	$	0	$	50.1	$	0.5	$	0	$	0	$	0	$	50.6
AA	0		0		0		237.7		1.2		0.1		0		27.4		266.4
A	282.5		222.5		42.7		504.6		0		2.2		31.2		9.7		1,095.4
BBB	2,361.4		904.1		361.5		684.2		0		635.6		53.4		207.9		5,208.1
Non-investment grade/non-rated:
BB	23.5		117.2		98.1		14.8		0		100.9		27.7		25.5		407.7
B	105.5		79.1		40.4		46.3		0		9.5		17.2		4.1		302.1
Total fair value	$	2,772.9	$	1,322.9	$	542.7	$	1,537.7	$	1.7	$	748.3	$	129.5	$	274.6	$	7,330.3

At June 30, 2018, we held $1,496.2 million of U.S. dollar-denominated corporate bonds issued by companies that are domiciled, or whose parent companies are domiciled, in the U.K. ($260.5 million) and other European countries ($1,235.7 million), primarily in the consumer, financial, and industrial industries.

PREFERRED STOCKS – REDEEMABLE AND NONREDEEMABLE

We hold both redeemable (i.e., mandatory redemption dates) and nonredeemable (i.e., perpetual with call dates) preferred stocks. At June 30, 2018, we held $229.1 million in redeemable preferred stocks and $758.6 million in nonredeemable preferred stocks, compared to $206.7 million and $783.1 million, respectively, at June 30, 2017, and $211.0 million and $803.8 million at December 31, 2017. At June 30, 2018, our preferred stock portfolio had net unrealized gains of $12.1 million and net holding period gains of $78.2 million recorded as part of net realized gains (losses), compared to $134.4 million and $121.5 million of net unrealized gains at June 30, 2017 and December 31, 2017, respectively.

Our preferred stock securities had a small positive return in the second quarter of 2018 as their high level of income was able to offset declines in prices due to higher rates and wider spreads. Changes in the corporate tax rate have made other sectors more attractive relative to preferreds. In combination with that, spreads are still somewhat tight on a longer-term basis. With slightly wider spreads and growth in the overall fixed-income portfolio, we added to a few positions during the quarter to keep our allocation relatively steady at this lower level.

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Our preferred stock portfolio had a duration of 2.9 years at June 30, 2018, compared to 2.8 years at June 30, 2017, and 2.9 years at December 31, 2017. The majority of our preferred securities have fixed-rate dividends until a call date and then, if not called, convert to floating-rate dividends. The interest rate duration of our preferred securities is calculated to reflect the call, floor, and floating-rate features. Although a preferred security will remain outstanding if not called, its interest rate duration will reflect the variable nature of the dividend. The overall credit quality rating was BBB- for all three periods. Our non-investment-grade preferred stocks were primarily with issuers that maintain investment-grade senior debt ratings.

The table below shows the exposure break-down by sector and rating at quarter end:

Preferred Stocks (at June 30, 2018)
	Financial Services
(millions) Rating	U.S. Banks		Foreign Banks		Insurance		Other		Industrials		Utilities		Total
A	$	56.4	$	0	$	0	$	10.1	$	0	$	0	$	66.5
BBB	388.7		0		65.6		54.8		116.0		4.6		629.7
Non-investment grade/non-rated:
BB	158.8		5.1		42.7		0		40.8		0		247.4
B	0		0		0		39.1		0		0		39.1
Non-rated	0		0		0		0		5.0		0		5.0
Total fair value	$	603.9	$	5.1	$	108.3	$	104.0	$	161.8	$	4.6	$	987.7

We also face the risk that dividend payments on our preferred stock holdings could be deferred for one or more periods or skipped entirely. As of June 30, 2018, all of our preferred securities continued to pay their dividends in full and on time. Approximately 80% of our preferred stock securities pay dividends that have tax preferential characteristics, while the balance pay dividends that are fully taxable.

At June 30, 2018, we held $102.6 million of U.S. dollar-denominated preferred stocks ($5.1 million nonredeemable and $97.5 million redeemable) issued by financial institutions that are domiciled, or whose parent companies are domiciled, in foreign countries.

Common Equities

Common equities, as reported on the balance sheets, were comprised of the following:

($ in millions)	June 30, 2018				June 30, 2017				December 31, 2017
Indexed common stocks	$	2,985.7	95.0	%	$	2,931.5	95.3	%	$	3,248.4	95.6	%
Managed common stocks	156.2		5.0		145.7		4.7		151.1		4.4
Total common stocks	3,141.9		100.0		3,077.2		100.0		3,399.5		100.0
Other risk investments	0.3		0		0.3		0		0.3		0
Total common equities	$	3,142.2	100.0	%	$	3,077.5	100.0	%	$	3,399.8	100.0	%

In our indexed common stock portfolio, our individual holdings are selected based on their contribution to the correlation with the index. For all three periods reported in the table above, the GAAP basis total return was within the desired tracking error of +/- 50 basis points when compared to the Russell 1000 Index. We held 816 out of 988, or 83%, of the common stocks comprising the Russell 1000 Index at June 30, 2018, which made up 93% of the total market capitalization of the index.

We reduced our exposure to common equities during the first quarter of 2018 by approximately 10% by selling securities in our indexed common stock portfolio and re-allocating the funds to our fixed-maturity portfolio.

The actively managed common stock portfolio is managed by one external investment manager. At June 30, 2018, the fair value of the actively managed portfolio was $156.2 million, compared to an adjusted cost basis of $123.1 million.

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Safe Harbor Statement Under the Private Securities Litigation Reform Act of 1995: Investors are cautioned that certain statements in this report not based upon historical fact are forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995. These statements often use words such as “estimate,” “expect,” “intend,” “plan,” “believe,” and other words and terms of similar meaning, or are tied to future periods, in connection with a discussion of future operating or financial performance. Forward-looking statements are based on current expectations and projections about future events, and are subject to certain risks, assumptions and uncertainties that could cause actual events and results to differ materially from those discussed herein. These risks and uncertainties include, without limitation, uncertainties related to estimates, assumptions, and projections generally; inflation and changes in general economic conditions (including changes in interest rates and financial markets); the possible failure of one or more governmental, corporate, or other entities to make scheduled debt payments or satisfy other obligations; our ability to access capital markets and financing arrangements when needed to support growth or other capital needs, and the favorable evaluations by credit and other rating agencies on which this access depends; the potential or actual downgrading by one or more rating agencies of our securities or governmental, corporate, or other securities we hold; the financial condition of, and other issues relating to the strength of and liquidity available to, issuers of securities held in our investment portfolios and other companies with which we have ongoing business relationships, including reinsurers and other counterparties to certain financial transactions or under certain government programs; the accuracy and adequacy of our pricing, loss reserving, and claims methodologies; the competitiveness of our pricing and the effectiveness of our initiatives to attract and retain more customers; initiatives by competitors and the effectiveness of our response; our ability to obtain regulatory approval for the introduction of products to new jurisdictions, for requested rate changes and the timing thereof and for any proposed acquisitions; the effectiveness of our brand strategy and advertising campaigns relative to those of competitors; legislative and regulatory developments at the state and federal levels, including, but not limited to, matters relating to vehicle and homeowners insurance, health care reform and tax law changes; the outcome of disputes relating to intellectual property rights; the outcome of litigation or governmental investigations that may be pending or filed against us; severe weather conditions and other catastrophe events; the effectiveness of our reinsurance programs; changes in vehicle usage and driving patterns, which may be influenced by oil and gas prices, changes in residential occupancy patterns, and the effects of the emerging “sharing economy”; advancements in vehicle or home technology or safety features, such as accident and loss prevention technologies or the development of autonomous or partially autonomous vehicles; our ability to accurately recognize and appropriately respond in a timely manner to changes in loss frequency and severity trends; technological advances; acts of war and terrorist activities; our ability to maintain the uninterrupted operation of our facilities, systems (including information technology systems), and business functions, and safeguard personal and sensitive information in our possession, whether from cyber-attacks, other technology events or other means; our continued access to and functionality of third-party systems that are critical to our business; our continued ability to access cash accounts and/or convert securities into cash on favorable terms when we desire to do so; restrictions on our subsidiaries’ ability to pay dividends to The Progressive Corporation; possible impairment of our goodwill or intangible assets if future results do not adequately support either, or both, of these items; court decisions, new theories of insurer liability or interpretations of insurance policy provisions and other trends in litigation; changes in health care and auto and property repair costs; and other matters described from time to time in our releases and publications, and in our periodic reports and other documents filed with the United States Securities and Exchange Commission. In addition, investors should be aware that generally accepted accounting principles prescribe when a company may reserve for particular risks, including litigation exposures. Accordingly, results for a given reporting period could be significantly affected if and when a reserve is established for one or more contingencies. Also, our regular reserve reviews may result in adjustments of varying magnitude as additional information regarding claims activity becomes known. Reported results, therefore, may be volatile in certain accounting periods.

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Item 3. Quantitative and Qualitative Disclosures About Market Risk.

The duration of the financial instruments held in our portfolio that are subject to interest rate risk was 2.6 years at June 30, 2018 and 2.5 years at December 31, 2017. The weighted average beta of the equity portfolio was 1.00 at June 30, 2018, compared to 1.05 at December 31, 2017. Although components of the portfolio have changed, no material changes have occurred in the total interest rate or market risk when compared to the tabular presentations of our interest rate and market risk sensitive instruments in our Annual Report on Form 10-K for the year ended December 31, 2017.

Item 4. Controls and Procedures.

Progressive, under the direction of our Chief Executive Officer and our Chief Financial Officer, has established disclosure controls and procedures that are designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Securities Exchange Act of 1934 is recorded, processed, summarized, and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms. The disclosure controls and procedures are also intended to ensure that such information is accumulated and communicated to our management, including the Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosures.

Our Chief Executive Officer and our Chief Financial Officer reviewed and evaluated Progressive’s disclosure controls and procedures as of the end of the period covered by this report. Based on that review and evaluation, the Chief Executive Officer and Chief Financial Officer concluded that Progressive’s disclosure controls and procedures are effectively serving the stated purposes as of the end of the period covered by this report.

We are not aware of any material change in Progressive’s internal control over financial reporting during our most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II—OTHER INFORMATION

Item 1A. Risk Factors.

The risk factors affecting our business are discussed in Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2017. There have been no material changes in the risk factors that were discussed in that report.

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

(c) Share Repurchases

ISSUER PURCHASES OF EQUITY SECURITIES
2018 Calendar Month	Total Number of Shares Purchased	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Maximum Number of Shares That May Yet be Purchased Under the Plans or Programs
April	1,861	$	60.22	1,523,523	23,476,477
May - prior authorization	30,467	60.23		1,553,990	—
May - current authorization	435	60.10		435	24,999,565
June	3,676	62.33		4,111	24,995,889
Total	36,439	$	60.44

On May 16, 2018, the Company publicly announced that its Board of Directors renewed the authorization for the Company to repurchase up to 25 million of its common shares. This authorization, which does not have an expiration date, terminated the 23,446,010 shares that remained under the Board’s prior authorization to repurchase 25 million common shares, which was originally announced on May 12, 2017.

Share repurchases under this authorization may be accomplished through open market purchases, through privately negotiated transactions, pursuant to our equity incentive plans, or otherwise, and may include trading plans entered into with one or more brokerage firms in accordance with Rule 10b5-1 under the Securities Exchange Act of 1934. During the second quarter2018, all repurchases were accomplished in conjunction with our incentive compensation plans at the then-current market prices; there were no open market purchases during the quarter. Progressive’s financial policies state that we will repurchase shares to neutralize dilution from equity-based compensation in the year of issuance and as an option to effectively use underleveraged capital.

Item 5. Other Information.

I. OTHER

President and CEO Susan Patricia Griffith’s letter to shareholders with respect to our second quarter2018 results is included as Exhibit 99 to this Quarterly Report on Form 10-Q. The letter is also posted on Progressive’s website at progressive.com/annualreport.

Item 6. Exhibits.

See exhibit index on page 61.

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SIGNATURES

Pursuant to the requirements 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.

		THE PROGRESSIVE CORPORATION
		(Registrant)
Date:	July 31, 2018	By: /s/ John P. Sauerland
		John P. Sauerland
		Vice President and Chief Financial Officer

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EXHIBIT INDEX
Exhibit No. Under Reg. S-K, Item 601	Form  10-Q Exhibit Number	Description of Exhibit	If Incorporated by Reference, Documents with Which Exhibit was Previously Filed with SEC
10	10	Executive Deferred Compensation (2018 Amendment and Restatement)	Filed herewith
31	31.1	Rule 13a-14(a)/15d-14(a) Certification of the Principal Executive Officer, Susan Patricia Griffith	Filed herewith
31	31.2	Rule 13a-14(a)/15d-14(a) Certification of the Principal Financial Officer, John P. Sauerland	Filed herewith
32	32.1	Section 1350 Certification of the Principal Executive Officer, Susan Patricia Griffith	Furnished herewith
32	32.2	Section 1350 Certification of the Principal Financial Officer, John P. Sauerland	Furnished herewith
99	99	Letter to Shareholders from Susan Patricia Griffith, President and Chief Executive Officer (Regulation FD Disclosure)	Furnished herewith
101	101.INS	XBRL Instance Document	Filed herewith
101	101.SCH	XBRL Taxonomy Extension Schema Document	Filed herewith
101	101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document	Filed herewith
101	101.DEF	XBRL Taxonomy Extension Definition Linkbase Document	Filed herewith
101	101.LAB	XBRL Taxonomy Extension Label Linkbase Document	Filed herewith
101	101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document	Filed herewith

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EX-10

Exhibit 10

THE PROGRESSIVE CORPORATION EXECUTIVE

DEFERRED COMPENSATION PLAN

(2018 Amendment and Restatement)

TABLE OF CONTENTS

PAGE NO.

ARTICLE 1 -- DEFINITIONS    1

1.1‘Affiliated Company’    1

1.2‘Account or Deferral Account’    1

1.3 ‘Annual Performance-Based Stock Award    1

1.4 ‘Annual Time-Based Stock Award’     2

1.5 ‘Annual Stock Award’ 2

1.6‘Award’    2

1.7‘Beneficiary’    2

1.8‘Change in Control’    2

1.9‘Code’    2

1.10‘Committee’    2

1.11‘Company’    2

1.12‘Company Stock Fund’    2

1.13‘Deduction Limitation’    2

1.14‘Deferral Agreement’    3

1.15‘Deferral’    3    

1.16‘Distribution Event’    3

1.17‘Eligible Executive’    3

1.18‘ERISA’    3

1.19‘Fixed Deferral Period’    3

1.20‘Gainsharing Award’    3

1.21‘Incentive Plan’    3

1.22‘Investment Fund’    4

1.23 ‘Non-Annual Stock Award’ 4

1.24‘Participant’    4

1.25‘Performance-Based Stock Award’    4

1.26‘Plan’    4

1.27‘Plan Year’    4

1.28‘Restricted Stock’    4

1.29‘Restricted Stock Unit’    4

1.30‘Separation from Service’    4

1.31‘Stock’    4

1.32‘Stock Awards’    4

1.33‘Termination of Employment’    4

1.34‘Time-Based Stock Award’    4

1.35 ‘Trust’    5

1.36‘Trust Agreement’    5

1.37‘Trustee’    5

1.38‘Unforeseeable Emergency’    5

1.39‘Valuation Date’    5

ARTICLE 2 -- DEFERRAL OF AWARDS    5

2.1Method of Deferral    5

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2.2Deferral Agreement Provisions    5

2.3Fixed Deferral Periods    6

ARTICLE 3 -- DISTRIBUTIONS AND WITHDRAWALS    7

3.1Date of Distribution    7

3.2Method of Distribution    7

3.3Amount of Distribution    8

3.4Form of Distribution    8

3.5Involuntary Cashouts    9

3.6Special Distributions    9

ARTICLE 4 -- ACCOUNTS    9

4.1Establishment of Annual Deferral Accounts    9

4.2Investment of Accounts    10

4.3Valuation of Investment Funds    10

4.4Valuation of Accounts    11

4.5Nature of Accounts    11

4.6Account Statements    11

ARTICLE 5 -- INVESTMENT FUNDS    11

5.1Investment Funds    11

5.2Investment Elections of Participants    11

5.3Transfers    12

5.4Special Rule for Stock Awards    12

5.5Nature of Investment Funds    12

5.6Liquidation of Investment Funds    12

ARTICLE 6 -- TRUST    13

6.1Establishment of Trust    13

ARTICLE 7 -- PLAN OPERATION AND ADMINISTRATION    13

7.1Powers of Committee    13

7.2Reliance on Tables, etc.    14

73Indemnification    14

7.4 Notices to Committee    14

ARTICLE 8 -- CLAIMS PROCEDURES    15

8.1Establishment of Claims Procedure    15

8.2Claims Denials    15

8.3Appeals of Denied Claims    15

8.4Review of Appeals    16

8.5Extensions    16

ARTICLE 9 -- AMENDMENT AND TERMINATION OF THE PLAN    16

9.1Amendment    16

9.2Termination    17

9.3Liquidation of the Trust    17

ARTICLE 10 -- MISCELLANEOUS PROVISIONS    17

10.1Headings    17

10.2Plan Not Contract of Employment    17

10.3Severability    18

10.4Prohibition on Assignment    18

10.5Number and Gender    18

10.6Governing Law    18

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10.7Satisfaction of Claims    18

10.8No Liability    18

10.9Tax Withholding    19

10.10Facility of Payment    19

10.11Repayment of Awards    19

10.12Stock Subject to the Plan    19

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THE PROGRESSIVE CORPORATION EXECUTIVE

DEFERRED COMPENSATION PLAN

(2018 Amendment and Restatement)

WHEREAS, The Progressive Corporation (“Company”) maintains The Progressive Corporation Executive Deferred Compensation Plan pursuant to a 2010 Amendment and Restatement and four amendments thereto; and

WHEREAS, it is desired to amend and restate the Plan;

NOW, THEREFORE, effective May 10, 2018, the Plan is hereby amended and restated in its entirety to provide as follows:

GRANDFATHERED PROVISIONS

GOVERNING CERTAIN PRIOR DEFERRALS

The Plan, as in effect on December 31, 2007, shall remain unchanged and continue in full force and effect, but only with respect to Awards that were earned and became vested on or before December 31, 2004. For the period January 1, 2005 through December 31, 2007, the Plan was operated in compliance with Section 409A of the Code, pursuant to a reasonable interpretation of that section, as it was then in effect, with respect to Awards that were earned or become vested on or after January 1, 2005.

AMENDED AND RESTATED PROVISIONS

Effective May 10, 2018, the Plan is hereby amended and restated in its entirety to provide as follows:

ARTICLE 1

DEFINITIONS

1.1    "Affiliated Company" means any corporation or other entity included in the affiliated group of corporations as defined in Section 1504 of the Code (determined without regard to 1504(b)) of which the Company is the common parent corporation.

1.2    "Account" or "Deferral Account" shall have the meaning set forth in Section 4.1.

1.3“Annual Performance-Based Stock Award” means a Performance-Based Stock Award that is made once annually on the same date to substantially all Eligible Executives eligible to receive the Award under an Incentive Plan.

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1.4“Annual Time-Based Stock Award” means a Time-Based Stock Award that is made once annually on the same date to substantially all Eligible Executives eligible to receive the Award under an Incentive Plan.

1.5“Annual Stock Award” means an Annual Performance-Based Stock Award or an Annual Time-Based Stock Award.

1.6    “Award” means a Gainsharing Award or Stock Award.

1.7    "Beneficiary" means such person(s) as the Participant has designated. A Participant may change his/her Beneficiary designation at any time. All Beneficiary designations (including changes) shall be made in writing on such forms as the Committee shall prescribe, and shall become effective only when received and accepted by the Committee; provided, however, that a Beneficiary designation (including a change) received by the Committee after the designating Participant's death shall be disregarded. In the absence of a Beneficiary designation, or if the designated Beneficiary is no longer living or in existence at the time of the Participant's death, all distributions payable from the Plan upon the Participant's death shall be paid to the Participant's estate.

1.8        "Change in Control" means a change in the ownership of the Company, a change in effective control of the Company, or a change in the ownership of a substantial portion of the Company’s assets, each as determined in accordance with Section 409A of the Code.

1.9        "Code" means the Internal Revenue Code of 1986, as amended, and the regulations promulgated pursuant thereto.

1.10        "Committee" means the Compensation Committee of the Board of Directors of the Company, or any successor committee.

1.11        "Company" means The Progressive Corporation, an Ohio corporation, or its successors.

1.12        "Company Stock Fund" means an Investment Fund consisting of Stock and cash, and administered in accordance with such rules regarding reinvestment of dividends and treatment of fractional shares as the Committee shall prescribe.

1.13        "Deduction Limitation" means the following described limitation on a payment that may otherwise be distributable under the Plan. If the Committee determines in good faith that there is a reasonable anticipation that any compensation to a Participant for a taxable year of the Company would not be deductible by the Company solely by reason of the limitation under Code Section 162(m), the Committee may elect to defer all or any portion of a distribution otherwise payable to the Participant under this Plan to the extent necessary to preserve the Company’s deduction under Code Section 162(m) for such taxable year; provided, however, that if the Committee elects to defer a portion of a distribution in respect of a Participant pursuant to this Section 1.10, then the Committee shall also defer all remaining portions of such distribution to the extent permissible under this Section 1.10. Any amounts deferred pursuant to this limitation shall continue to be deemed to be invested as

2

provided in Article 5. The amounts so deferred (subject to investment gains and losses) shall be distributed to the Participant or his or her Beneficiary (if the Participant dies) no later than the last day of the Plan Year in which the Committee determines in good faith that the deductibility of compensation paid or payable to the Participant for the taxable year of the Company during which the distribution is made will not be limited by Code Section 162(m), or the last day of the Plan Year in which the Participant experiences a Separation from Service (or, if later, no later than six months and one day following the date of such Separation from Service).

1.14        "Deferral Agreement" means an agreement entered into by an Eligible Executive pursuant to Article 2.

1.15        "Deferral" means an amount credited to a Deferral Account pursuant to a Deferral Agreement.

1.16        "Distribution Event" means, as to each Participant, the earliest of the following events:

(i)    the Participant's death;

(ii)    the Participant's Termination of Employment; or

(iii)    Change in Control.

1.17        "Eligible Executive" means any executive of the Company or any Affiliated Company who has a target Gainsharing Award of 35% or more of salary or who is designated in writing as an Eligible Executive by the Committee, excluding, however, individuals who are not residents of the United States or are not working at a location in the United States.

1.18        "ERISA" means the Employee Retirement Income Security Act of 1974, as amended, and the regulations promulgated pursuant thereto.

1.19        "Fixed Deferral Period" shall have the meaning set forth in Section 2.3.

1.20        "Gainsharing Award" means any bonus or other incentive award payable with respect to a Plan Year under any plan that expressly allows deferrals under this Plan, including The Progressive Corporation Gainsharing Plan, The Progressive Capital Management Bonus Plan, The Progressive Capital Management Annual Incentive Plan, The Progressive Corporation Executive Bonus Plan, The Progressive Corporation 2017 Executive Annual Incentive Plan and any other plan or program as may be designated by the Committee.

1.21        “Incentive Plan”means The Progressive Corporation 2003 Incentive Plan, The Progressive Corporation 2010 Equity Incentive Plan, The Progressive Corporation 2015 Equity Incentive Plan, in each case as amended from time to time, or any similar plan that may be adopted by the Company in the future and that provides for the issuance of restricted stock and/or restricted stock units.

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1.22        "Investment Fund" means a device established from time to time by the Committee pursuant to Section 5.1 that is used to calculate gains and losses in amounts deferred by Participants under the Plan.

1.23        “Non-Annual Stock Award” means a Stock Award that is not an Annual Stock Award.

1.24        "Participant" means an Eligible Executive who has deferred receipt of a portion of any Award pursuant to a Deferral Agreement. Participation shall begin on the date that a Deferral Account is established in the name of the Participant and shall end on the date that the Participant dies or receives a distribution of the balance of all his/her Deferral Accounts.

1.25    “Performance-Based Stock Award” means a “Performance-Based Award,” or an Award of ”Performance-Based Restricted Stock” or “Performance-Based Restricted Stock Units,” (or their equivalents) as defined in an Incentive Plan.

1.26    "Plan" means The Progressive Corporation Executive Deferred Compensation Plan (2010 Amendment and Restatement), as set forth herein and as it may be amended from time to time.

1.27"Plan Year" means 2010 and each subsequent calendar year.

1.28    “Restricted Stock” means an award of shares of Stock that is made pursuant to an Incentive Plan and is subject to restrictions.

1.29    “Restricted Stock Unit” ” means an award, the value of which is determined by reference to a quantity of Stock, that is granted under an Incentive Plan and is subject to restrictions.

1.30“Separation from Service” shall have the meaning set forth in Section 409A of the Code.

1.31    "Stock" means the Common Shares, $1.00 par value, of the Company.

1.32            “Stock Awards” means an award of Restricted Stock or Restricted Stock Units.

1.33    "Termination of Employment" means the voluntary or involuntary cessation of a Participant's employment with the Company and all Affiliated Companies as a result of a Separation from Service for any reason other than death, a military leave, sick leave or other leave of absence that is reasonably expected to last for a period of less than six months, or any leave of absence for which the Participant retains a right to reemployment either by statute or by contract with the Company.

1.34        “Time-Based Stock Award” means a “Time-Based Award,” or an Award of “Time-Based Restricted Stock” or “Time-Based Restricted Stock Units,” (or their equivalents) as defined in an Incentive Plan.

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1.35"Trust"     shall mean the trust maintained pursuant to the Trust Agreement and known as The Progressive Corporation Executive Deferred Compensation Trust.

1.36    "Trust Agreement" shall mean the agreement of trust between the Company and the Trustee executed in furtherance of the Plan, as the same may be amended from time to time.

1.37    "Trustee" shall mean the person selected from time to time by the Company to serve as trustee under the Trust Agreement.

1.38“Unforeseeable Emergency” shall have the meaning set forth in Section 409A of the Code.

1.39"Valuation Date" shall mean each day that the New York Stock Exchange is open for trading.

ARTICLE 2

DEFERRAL OF AWARDS

2.1    Method of Deferral.

Each Eligible Executive may elect to defer receipt of all or a portion of his/her Gainsharing Award and/or the entirety of any of his/her Stock Awards in respect of any Plan Year by completing a Deferral Agreement in such manner and in accordance with such procedures as the Committee shall establish from time to time. If a Gainsharing Award is payable in installments, each installment, whether or not payable in the same Plan Year, shall be subject to the same Deferral Agreement. Any taxes or other amounts due with respect to any deferred Gainsharing Award or Annual Stock Award shall be paid by the Eligible Executive to the Company no later than the date specified by the Company. Non-Annual Stock Awards are not eligible to be deferred under the Plan.

2.2    Deferral Agreement Provisions.

Each Deferral Agreement must satisfy all of the following requirements:

(a) it must be in the form specified by the Committee;

(b) it must be completed in such manner and in accordance with such procedures as the Committee shall establish from time to time: (i) as to each Gainsharing Award, prior to the Plan Year in which the Gainsharing Award will be earned, and (ii) as to each Annual Stock Award, prior to the Plan Year the Annual Stock Award is granted;

(c) it must be irrevocable;

5

(d) as to deferrals of Gainsharing Awards, it must apply to only one such Gainsharing Award;

(e) as to deferrals of Annual Stock Awards, it must apply to all Annual Time-Based Stock Awards granted during the Plan Year, all Annual Performance-Based Stock Awards granted during the Plan Year, or both;

(f) as to deferrals of Gainsharing Awards, it must specify the percentage of the Eligible Executive's Gainsharing Award to be deferred, which percentage shall not be less than ten percent (10%). The same deferral percentage shall apply to each installment of a Gainsharing Award covered by the Deferral Agreement. However, a Deferral Agreement may provide for the deferral of a percentage of that portion of a Gainsharing Award that exceeds a specified gross dollar amount, which percentage shall not be less than ten percent (10%). Notwithstanding the preceding provisions of this Section 2.2(f), no Deferral shall be less than such dollar amount as the Committee may specify from time to time;

(g) as to deferral of an Annual Stock Award, it must apply to the entirety of each Annual Time-Based Stock Award granted during the Plan Year, the entirety of each Annual Performance-Based Stock Award granted during the Plan Year, or both;

(h) it must specify whether the balance of the Deferral Account to be established pursuant to that Deferral Agreement will be distributed in a lump sum, in three (3) annual installments, in five (5) annual installments, or in ten (10) annual installments;

(i) it must specify the Fixed Deferral Period, if any, elected by the Eligible Executive pursuant to Section 2.3 of this Plan; and

(j) it must contain such other provisions, conditions and limitations as may be required by the Company or the Committee.

2.3    Fixed Deferral Periods.

If an Eligible Executive wishes to defer receipt of all or a portion of any Award for a fixed period of time (“Fixed Deferral Period”), then his/her Deferral Agreement relating to such Award shall specify that Fixed Deferral Period. Such Fixed Deferral Period shall not be less than three (3) years following (i) in the case of a deferral of all or a portion of a Gainsharing Award, the end of the Plan Year in which the Gainsharing Award will be earned and (ii) in the case of a deferral of a Stock Award, the end of the Plan Year in which the last of the restrictions applicable to the Stock Award expires. In the case of a Stock Award as to which restrictions expire in installments, the Fixed Deferral Period must end on the same date for all installments. Notwithstanding the preceding provisions of this Section 2.3, Eligible Executives may not elect a Fixed Deferral Period with respect to the deferral of any Performance-Based Stock Award.

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ARTICLE 3

DISTRIBUTIONS AND WITHDRAWALS

3.1    Date of Distribution.

Distribution of the balance of each Deferral Account of a Participant shall be made or shall commence within thirty (30) days following the earlier of (i) the date the Committee receives notice that a Distribution Event has occurred, or (ii) the date on which the Fixed Deferral Period, if any, applicable to such Account expires. Notwithstanding the preceding provisions, each distribution made on account of a Participant’s Termination of Employment shall not be made or commence until six (6) months after the date of such Termination of Employment. If Distribution is to be made in installments, payment of installments following the first installment shall be made within thirty (30) days following each anniversary of (1) the date referred to in clause (i) or (ii) of the first sentence of this Section 3.1 or (2) the date of a Participant’s Termination of Employment, as applicable, until all installments have been paid.

The Committee in its sole discretion may also permit distribution of all or a portion of the balance of a Participant’s Deferral Accounts to be made following the Committee’s receipt of written notice that an Unforeseeable Emergency has occurred with respect to such Participant. Such distribution shall be limited to the amount reasonably necessary to satisfy the need created by such Unforeseeable Emergency, plus any applicable taxes. If the Committee approves such an Unforeseeable Emergency distribution, no further Deferrals shall be made with respect to such Participant following the date of the Committee’s approval, and each Deferral Agreement to which such Participant is then a party shall be of no further effect. To the extent permitted under Section 409A of the Code, a Participant who receives a distribution due to an Unforeseeable Emergency may enter into a new Deferral Agreement in any Plan Year following the Plan Year in which the Participant received such distribution.

Notwithstanding the preceding provisions of this Section 3.1, a Participant may elect to change the date any distribution on account of expiration of a Fixed Deferral Period is to be made or commence. Each such election change must be made in writing and on such forms as the Committee shall specify. Each such election change must be delivered to the Committee at least one (1) year prior to the expiration of the Fixed Deferral Period and shall delay the payment or commencement of distributions to the Participant for a period of at least five (5) years following the date such distribution otherwise would have been made or would have commenced. In the case of a distribution to be made in installments, the provisions of this paragraph shall apply to each installment payment as if each such installment payment were a separate distribution.

Participants desiring to receive a distribution due to Unforeseeable Emergency, shall submit a written request to the Committee in such form as it shall specify.

3.2    Method of Distribution.

Each distribution of all or a portion of the balance of a Deferral Account shall be made to the Participant, except that any such distribution made on account of the Participant's death shall

7

be made to the Participant's Beneficiary. Each distribution made on account of the Participant's death, Unforeseeable Emergency or a Change in Control shall be paid in a lump sum. Each distribution made on account of the Participant's Termination of Employment or expiration of a Fixed Deferral Period shall be paid in either a lump sum or installments, as specified in the applicable Deferral Agreement.

If a Participant elects to receive payment in installments and dies prior to payment of all installments, the balance remaining unpaid at his/her death shall be paid to his/her Beneficiary in a lump sum.

Installment payments shall be paid in three (3) annual installments, in five (5) annual installments or in ten (10) annual installments, as specified in the applicable Deferral Agreement.

Notwithstanding the preceding provisions of this Section 3.2, a Participant may elect to change the method of distribution elected in respect of any distribution to be made on account of Termination of Employment or expiration of a Fixed Deferral Period to any of the four permissible distribution options set forth in Section 2.2(i). Such election change shall not take effect until the first anniversary of the date it is delivered to the Committee. Each such election change must be made in writing and on such forms as the Committee shall specify. Any election change with respect to a Fixed Deferral Period must be delivered to the Committee at least one (1) year prior to the expiration of the Fixed Deferral Period. In addition, any election change with respect to a Termination of Employment or Fixed Deferral Period shall delay the payment or commencement of distributions to a Participant for a period of at least five (5) years following the date such distribution otherwise would have been made or would have commenced.

3.3    Amount of Distribution.

The amount of each lump sum payment shall be equal to the balance of the Deferral Account, as of the Valuation Date immediately preceding the date of any distribution from the Plan. In the case of a lump sum payment made upon the occurrence of an Unforeseeable Emergency, the amount shall be such portion of such balance as the Committee, in its sole discretion, shall determine, as being reasonable necessary to meet the need created by such Unforeseeable Emergency, plus any applicable taxes. The amount of each installment payment shall be equal to the balance of the Deferral Account as of the Valuation Date immediately preceding the date of payment multiplied by a fraction, the numerator of which is one and the denominator of which is the number of years remaining in the period over which installments are to be paid. Installment distributions to be made in Stock shall be rounded to the nearest whole share. Notwithstanding anything in the Plan to the contrary, all distributions, except those made on account of a Change in Control, are subject to the Deduction Limitation.

3.4    Form of Distribution.

Distributions of Deferrals of Stock Awards granted in 2005 and later years shall be made in Stock, with any fractional shares of Stock and any portion of such distribution that is derived

8

from cash dividends on deferred Restricted Stock Awards to be made in cash. All other Plan distributions shall be made in cash.

3.5    Involuntary Cashouts.

If, at any time during a Plan Year, the aggregate balance of a Participant’s Deferral Accounts under the Plan is less than the applicable dollar amount under Section 402(g)(1)(B) of the Code for that Plan Year, the Committee, in its sole discretion, may distribute such aggregate balance to such Participant in a lump sum.

3.6    Special Distributions.

Notwithstanding anything in this Plan to the contrary,

(i) The Committee, in its sole discretion, may make payment of all or a portion of one or more Participant’s Deferral Accounts at any time that the Plan fails to meet the requirements of Section 409A of the Code. Such payment may not exceed the amount required to be included in income of such Participant(s) as a result of such failure; and

(ii) The Committee, in its sole discretion, may distribute all or any portion of the Deferral Accounts of one or more Participants to reflect payment of state, local or foreign tax obligations or obligations imposed by the Federal Insurance Contributions Act (FICA), including the additional tax at source on wages, arising from participation in the Plan that apply to an amount deferred under the Plan before the amount is paid or made available to the Participant. Such payment to a Participant may not exceed the amount of such taxes due as a result of such Participant’s participation in the Plan. Such payment may be made to the Participant in the form of withholding pursuant to provisions of applicable state, local or foreign law, or by distribution directly to the Participant.

ARTICLE 4

ACCOUNTS

4.1    Establishment of Deferral Accounts.

The Committee shall establish a Deferral Account in the name of each Participant for each Gainsharing Award, or portion thereof, and each Stock Award that is the subject of a Deferral Agreement. As to Deferrals of Gainsharing Awards, each such Account shall be established as of the first date that such Gainsharing Award, or portion thereof, otherwise would have been paid to the Participant. As to deferrals of Stock Awards, each such Account shall be established as of the date that the restrictions applicable to such Stock Award expire. In the case of a Stock Award as to which the restrictions expire at different times for different portions of the Award, such Account shall be established as of the date the first of such restrictions expires. Each Deferral Account shall be credited with the deferred portion of such

9

Award at the time the Account is established, or, in the case of a Stock Award as to which the restrictions expire at different times for different portions of the Award, from time-to-time as such restrictions expire. Thereafter, all Deferral Accounts shall be valued and administered as provided in this Article. Notwithstanding anything in the Plan to the contrary, the Trustee may combine two (2) or more of any Participant’s Deferral Accounts into a single Account, if the Deferral Accounts to be combined (i) are subject to Fixed Deferral Periods ending on the same date or (ii) are not subject to Fixed Deferral Periods at all.

4.2    Investment of Accounts.

All credits to a Deferral Account of a Participant shall be deemed to be invested in such Investment Fund or Funds as the Participant shall elect from time to time in accordance with Article 5. The number of shares of Stock to be credited to a Participant’s Account by virtue of a Participant’s initial election to invest a portion of a Deferral in the Company Stock Fund shall be determined on the date of the Deferral in accordance with such procedures as the Committee shall establish, based on the weighted average price paid for all shares of Stock purchased by the Trustee and deposited in the Trust on that date pursuant to Article 6. If a Participant has any portion of a Deferral in the Company Stock Fund on the record date for a dividend to be paid on the Company’s Stock, an amount determined at a per share rate equivalent to such dividend shall be credited to the Participant’s Account as of the payment date for such dividend, and such amount shall be deemed to be reinvested in the Company Stock Fund. Notwithstanding the preceding provisions of this Section 4.2, (i) all credits to a Deferral Account of a Participant relating to a deferred Stock Award granted prior to March 17, 2005 (and dividends thereon), shall be deemed to be invested in the Company Stock Fund until six (6) months and one (1) day following the expiration of the restrictions applicable to such Award, unless otherwise determined by the Committee at or after the deferral of such Award, and, thereafter, the preceding provisions of this Section 4.2 shall apply, and (ii) all credits to a Deferral Account of a Participant relating to a deferred Stock Award granted on or after March 17, 2005 (including dividends thereon), shall be deemed to be invested in the Company Stock Fund until the balance of such Deferral Account has been distributed in accordance with Article 3.

4.3    Valuation of Investment Funds    .

As of each Valuation Date, the Trustee shall compute the value of each Investment Fund from which shall be determined the net gain or loss of such Investment Fund since the immediately preceding Valuation Date. The net gain or loss shall include any unrealized and realized profits and losses, and any dividends, interest or other income and any expenses which are due or accrued, but shall not include distributions from such Investment Fund. In determining the value of each Investment Fund, the Trustee shall use the following values: securities listed on any nationally recognized securities exchange shall be valued at the closing price reported on any such exchange on the Valuation Date, or, if there were no sales on the Valuation Date, then at the last quoted bid price on the Valuation Date. Securities not listed on a recognized securities exchange shall be valued at the last quoted closing bid price on the Valuation Date. A unit of participation in a common trust fund maintained by the Trustee or a share in a mutual fund shall be valued at the unit value, or share price respectively, in effect at the close of business on the Valuation Date. Securities with respect to which there were no available sale prices or bid prices on the Valuation Date, and any

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other investments, shall be valued at prices deemed by the Trustee to represent the fair market value thereof on the Valuation Date.

4.4    Valuation of Accounts.

As of each Valuation Date, the net gain or loss of each Investment Fund shall be allocated among the appropriate Deferral Accounts in accordance with such procedures as the Committee shall establish, which procedures shall apply uniformly to all Participants.

4.5    Nature of Accounts.

All credits to each Deferral Account of each Participant shall be recorded as a liability on the books of the Company. However, no Participant or Beneficiary shall have any proprietary rights of any nature with respect to any Account of any Participant or with respect to any funds, securities or other property owned by the Company or any Affiliated Company that is held in the Trust or that otherwise may be represented from time to time by Investment Funds. All payments under the Plan shall be made from the Trust or from the Company's general funds and in no event shall any Participant or Beneficiary have any claims or rights to any payment hereunder that are superior to any claims or rights of any general creditor of the Company.

4.6    Account Statements.

The Committee will furnish each Participant, or make available to each Participant on-line, periodic statements of the value of each of his/her Deferral Accounts.

ARTICLE 5

INVESTMENT FUNDS

5.1    Investment Funds.

The Committee shall establish and maintain the Company Stock Fund and such other Investment Funds as are specified from time to time by the Company. In this regard, the Company may choose to offer as Investment Funds any investment vehicles, including without limitation: (i) securities issued by investment companies advised by affiliates of the Trustee, (ii) guaranteed investment contracts recommended by the Trustee, and (iii) collective investment trusts maintained by the Trustee.

5.2    Investment Elections of Participants.

Each Participant shall make an investment election in the manner prescribed by the Committee, directing the manner in which his/her Deferrals shall be deemed to be invested. Each investment election must be made at the time the applicable Deferral Agreement is signed and may be changed upon notice to the Committee at any time prior to the deemed deposit of the applicable Deferral into one or more Investment Funds. Such elections and

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notices to the Committee must be made in such manner and in accordance with such procedures as the Committee shall establish from time to time. Each Participant may make a separate investment election for each of his/her Deferral Accounts. Each investment election shall specify that Deferrals shall be deemed to be deposited in one or more of the Investment Funds in percentages that are each an integral multiple of 1% and that in the aggregate equal 100% of the Deferral.

5.3    Transfers.

Amounts deemed to be invested in an Investment Fund pursuant to this Section may be transferred to another Investment Fund in accordance with such procedures and limitations as the Committee shall prescribe. The procedures and limitations prescribed by the Committee may include, without limitation, provisions which (i) limit transfers to specified dollar amounts or percentages (ii) limit the number of transfers that each Participant may make each Plan year (iii) limit the dates as of which transfers may become effective and (iv) impose waiting periods or other restrictions in connection with multiple transfers in and out of the same Investment Fund. All such procedures and limitations shall apply uniformly to similarly situated Participants.

5.4Special Rule for Stock Awards.

Notwithstanding the preceding provisions of this Article 5, each Deferral of a Stock Award shall be deemed to be invested in the Company Stock Fund until six (6) months and one (1) day following the date the restrictions applicable to such Stock Award expire, unless otherwise determined by the Committee at or after the deferral of such Award. Thereafter, the Participant may transfer all or a portion of such Deferral to another Investment Fund in accordance with the preceding provisions of this Article 5. Notwithstanding the preceding provisions of this Section 5.4, each Deferral of a Stock Award granted on or after March 17, 2005 shall be deemed to be invested in the Company Stock Fund until the Deferral Account to which such Deferral has been credited has been distributed in accordance with Article 3 of this Plan.

Nature of Investment Funds.

Notwithstanding anything in the Plan, Trust or any Deferral Agreement to the contrary, no Participant shall have any rights or interests in any particular funds, securities or property of the Company, any Affiliated Company or the Trust, or in any investment vehicle in which Deferrals are deemed to be invested, by virtue of any investment election made by the Participant under the Plan, any deemed investment under the Plan or any transactions engaged in by the Trust. Each Deferral Account, however, shall be credited/charged in accordance with Article 4 with gains/losses as if the Participant in fact had made a corresponding actual investment.

5.6 Liquidation of Investment Funds    .

If any Investment Fund is liquidated or otherwise ceases to exist without a successor, then that portion of each Account balance that previously has been deemed to have been invested in that Investment Fund shall be deemed to have been transferred to an Investment Fund

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consisting of money market instruments, or, if none, such other Investment Fund selected by the Committee.

ARTICLE 6

TRUST

6.1    Establishment of Trust.

The Company shall establish and maintain a Trust to provide a source of funds to assist the Company in meeting its liabilities under the Plan. Within thirty (30) days following the end of each Plan Year ending after the Trust has become irrevocable pursuant to the Trust Agreement, the Company shall be required to irrevocably deposit additional cash or other property to the Trust in an amount sufficient to pay each Participant or Beneficiary the benefits payable pursuant to the terms of the Plan as of the close of that Plan year.

The principal of the Trust, and any earnings thereon, shall be held separate and apart from other funds of Company and shall be used exclusively for the uses and purposes of Plan Participants and general creditors of the Company as set forth herein and in the Trust Agreement. Plan Participants and their Beneficiaries shall have no preferred claim on, or any beneficial ownership interest in, any assets of the Trust. Any rights created under the Plan and the Trust Agreement shall be mere unsecured contractual rights of Plan Participants and their Beneficiaries against Company. Any assets held by the Trust will be subject to the claims of the Company's general creditors under federal and state law in the event of Insolvency, as defined in the Trust Agreement. All assets deposited in the Trust shall be held, administered and distributed by the Trustee in accordance with the Trust Agreement. The Company shall pay directly, or reimburse the Trustee for, all taxes due in respect of any income or gains on Trust assets.

ARTICLE 7

PLAN OPERATION AND ADMINISTRATION

7.1    Powers of Committee.

The Committee will have full power to administer the Plan. Such power includes, but is not limited to, the following authority:

(a)    to make and enforce such rules and regulations as it deems necessary or proper for the efficient administration of the Plan;

(b)    to interpret the Plan and to decide all matters arising thereunder, including the right to resolve or remedy any ambiguities, errors, inconsistencies or omissions. All such interpretations shall be final and binding on all parties;

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(c)    to compute the amounts payable to any Participant or Beneficiary or other person in accordance with the provisions of the Plan;

(d)    to authorize disbursements from the Trust or the Plan;

(e) to keep such records and submit such filings, elections, applications, returns or other documents or forms as may be required under ERISA, the Code or other applicable law;

(f)    to appoint such agents, counsel, accountants and consultants as may be d    desirable to assist in administering the Plan;

(g)    To exercise the other powers that are expressly granted to it herein, or that are impliedly necessary for it to carry out any of its responsibilities hereunder; and

(h)    by written instrument, to delegate any of the foregoing powers.

7.2    Reliance on Tables, etc.

The Committee will be entitled, to the extent permitted by law, to rely conclusively on all tables, valuations, certificates, opinions and reports which are furnished by any accountant, Trustee, counsel or other expert retained by the Committee to assist it in administering the Plan.

7.3    Indemnification.

In addition to whatever rights of indemnification to which employees, officers and directors of the Company and the Affiliated Companies may be entitled under the articles of incorporation, regulations or bylaws of the Company or the Affiliated Companies, under any provision of law, or under any other agreement, the Company shall satisfy any liabilities actually and reasonably incurred by any such employee, officer or director, including expenses, attorneys' fees, judgments, fines and amounts paid in settlement, in connection with any threatened, pending, or completed action, suit, or proceeding which is related to the exercise or failure to exercise by such person or persons of any of the powers, authority, responsibilities, or discretion of the Company, the Affiliated Companies or the Committee provided under the Plan or the Trust Agreement, or reasonably believed by such person or persons to be provided thereunder, and any action taken by such person or persons in connection therewith.

7.4    Notices to Committee.

The Committee shall designate one or more addresses to which notices and other communications to the Committee shall be sent. No notice or other communication shall be considered to have been given to or received by the Committee until it has been delivered to the Committee's attention at one of such designated addresses.

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ARTICLE 8

CLAIMS PROCEDURES

8.1    Establishment of Claims Procedure

The Committee shall establish reasonable procedures under which a claimant, who may be a Participant, or Beneficiary, or his/her duly authorized representative, may present a claim for benefits under this Plan.

8.2 Claims Denials

Unless such claim is allowed in full by the Committee, written notice of the denial shall be furnished to the claimant within ninety (90) days (which may be extended by a period not to exceed an additional ninety (90) days if special circumstances so require and written notice to the claimant is given prior to the expiration of the initial ninety (90) day period describing such circumstances and indicating the date by which the Committee expects to render its determination) setting forth the following in a manner calculated to be understood by the claimant:

(i) The specific reason(s) for the denial;

(ii) Specific reference(s) to any pertinent provision(s) of the Plan or rules promulgated pursuant thereto on which the denial is based;

(iii) A description of any additional information or material as may be necessary to perfect the claim, together with an explanation of why it is necessary;

(iv) A description of the Plan’s claims review procedures and the time limits applicable to such procedures, including a statement of the claimant’s right to bring a civil action under Section 502(a) of ERISA following an adverse benefit determination on review; and

(v) An explanation of the steps to be taken if the claimant wishes to resubmit his/her claim for review.

8.3     Appeals of Denied Claims

Within a reasonable period of time after the denial of the claim, but in any event, not to be more than sixty (60) days, the claimant or his/her duly authorized representative may make written application to the Committee for a review of such denial. The claimant or his/her representative, may, upon request and free of charge, review or receive copies of documents, records and other information relevant to the claimant’s claim for benefits, and may submit written comments, documents, records and other information relating to the claim for benefits.

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8.4     Review of Appeals

If an appeal is timely filed, the Committee shall conduct a full and fair review of the claim and mail or deliver to the claimant its written decision within sixty (60) days after the claimant's request for review (which may be extended by a period not to exceed an additional sixty (60) days if special circumstances or a hearing so require and written notice to the claimant is given prior to the expiration of the initial sixty (60) day period describing such special circumstances and indicating the date by which the Committee expects to render its determination). In conducting its review, the Committee shall take into account all comments, documents, records and other information submitted by the claimant relating to the claim, without regard to whether such information was submitted or considered in the initial benefit determination. The Committee’s decision on review shall:

(i) Be written in a manner calculated to be understood by the claimant;

(ii)    State the specific reason(s) for the decision;

(iii)    Make specific reference to pertinent provision(s) of the Plan;

(iv)    State that the claimant is entitled to receive, upon request and free of charge, reasonable access to, and copies of, all documents, records and other information relevant to the claimant’s claim for benefits; and

(v)Include a statement of the claimant’s right to bring a civil action under

Section 502(a) of ERISA.

8.5 Extensions

If a period of time is extended, as permitted under Sections 8.2 and 8.4 above, due to a claimant’s failure to submit information to decide a claim, the period for making the benefit determination on review shall be tolled from the date on which the notification of the extension is sent to the claimant until the date on which the claimant responds to the request for additional information.

ARTICLE 9

AMENDMENT AND TERMINATION OF THE PLAN

9.1    Amendment.

The Company may amend the Plan and Trust Agreement in any respect at any time for any reason by action of the Committee without liability to any Participant, Beneficiary or other person for any such amendment or for any other action taken pursuant to this Section 9.1, provided that any amendment required to be approved by the Company's shareholders pursuant to Section 162(m) of the Code shall not be effective until approved by the Company's shareholders in accordance with the requirements of Section 162(m) and further

16

provided that no such amendment shall be made retroactively in a manner that would deprive any Participant of any rights or benefits which have accrued to his/her benefit under the Plan as of the date such amendment is proposed to be effective, unless such amendment is necessary to comply with applicable law.

9.2    Termination.

The Company may terminate the Plan at any time for any reason by action of the Committee without any liability to any Participant, Beneficiary or other person for any such termination or for any other action taken pursuant to this Section 9.2. Following termination of the Plan, and notwithstanding the provisions of any Deferral Agreement entered into prior to such termination, no additional Deferrals may be made hereunder, but all existing Accounts shall continue to be administered in accordance with the Plan, as in effect immediately prior to termination, and shall be distributed in accordance with such terms of the Plan and the applicable Deferral Agreements, unless and until the Company elects to accelerate distribution as provided below. At any time on or after the effective date of termination of the Plan, the Company, in its sole discretion, may elect to accelerate the distribution of the entire balance of each Participant's Accounts to the extent permitted under Section 409A of the Code. Such accelerated distributions shall be made (i) at a time selected by the Company in accordance with Section 409A of the Code and (ii) in a lump sum based on the value of the Accounts, determined as of the Valuation Date immediately preceding the date of distribution. Upon the completion of distributions to all Participants or Beneficiaries, as the case may be, no Participant, Beneficiary or person claiming under or through them, will have any claims in respect of the Plan.

9.3    Liquidation of the Trust.

The Trust shall continue in existence after the termination of the Plan for such period of time as may be required to complete the liquidation thereof in accordance with the terms of this Article 9.

ARTICLE 10

MISCELLANEOUS PROVISIONS

10.1    Headings.

The headings of the Plan have been inserted for convenience of reference only and are not to be deemed controlling in any constructions of the provisions herein (other than with respect to defined terms).

10.2    Plan Not Contract of Employment.

The existence of the Plan shall not create, evidence or change any contract of employment with any Participant. The right of the Company and all Affiliated Companies to take corrective,

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disciplinary or other action with respect to their employees, including terminating their respective employment at any time for any reason, shall not be affected by any provision of this Plan, and the Company and the Affiliated Companies will not be deemed responsible to provide continuing employment for any reason, at any time solely by reason of this Plan.

10.3    Severability.

If any provision of the Plan shall be invalid, such provision shall be fully severable, and the remainder of the Plan and the application thereof shall not be affected thereby.

10.4    Prohibition on Assignment.

No right or interest under the Plan of any Participant or Beneficiary shall be subject at any time or in any manner to anticipation, alienation, assignment (either at law or in equity), encumbrance (as security or otherwise), garnishment, levy, execution, or other legal or equitable process, and no Participant or Beneficiary shall have the power at any time or in any manner to anticipate, transfer, assign (either at law or in equity), alienate, or subject to attachment, garnishment, levy, execution or other legal or equitable process, or in any way encumber, such Participant's or Beneficiary's rights or interests under the Plan, and any attempt to do so shall be void; provided, however, that the Company shall have the unrestricted right to set off against or recover out of any payments due a Participant or Beneficiary at the time such payments would have otherwise been payable hereunder, any amounts owed the Company or any Affiliated Company by such Participant or Beneficiary.

10.5    Number and Gender.

Any use of the singular shall be interpreted to include the plural and the plural the singular. Any use of the masculine, feminine or neuter shall be interpreted to include the masculine, feminine and neuter, as the context shall require.

10.6    Governing Law.

To the extent not preempted by Federal law, the provisions of the Plan shall be construed, regulated and administered under the laws of the State of Ohio.

10.7    Satisfaction of Claims.

Any payment to any Participant or Beneficiary in accordance with the terms of the Plan shall, to the extent thereof, be in full satisfaction of all claims hereunder, whether they be against the Company, the Committee, or the Trustee, any of whom may require the Participant or Beneficiary (or legal representative), as a condition precedent to such payment to execute a release and receipt therefor.

10.8    No Liability.

Participation in the Plan is entirely at the risk of each Participant. Neither the Company, any Affiliated Company, the Committee, the Trustee nor any other person associated with the Plan shall have any liability for any loss or diminution in the value of Accounts, or for any

18

failure of the Plan to effectively defer recognition of income or to achieve any Participant's desired tax treatment or financial results.

10.9    Tax Withholding.

All payments under the Plan shall be subject to federal, state and local income tax withholding and other legally required deductions.

10.10 Facility of Payment.

If the Committee determines that a Participant or Beneficiary entitled to receive a payment under this Plan is (at the time such payment is to be made) a minor or physically, mentally or legally incompetent to receive such payment and that another person or an institution has legal custody of such minor or incompetent individual, the Committee may cause payment to be made to such person or institution having custody of such Participant or Beneficiary. Such payment, to the extent made, shall operate as a complete discharge of obligation by the Committee, the Company, the Trustee and the Trust.

10.11 Repayment of Awards.

If any amount credited to a Deferral Account represents a portion of an Award that is subsequently found to be repayable by the Participant to the Company or any Affiliated Company pursuant to the plan pursuant to which the Award was made, the amount of that credit shall nevertheless remain unaffected by that repayment obligation, and the Participant shall make the required repayment out of his/her own funds.

10.12 Stock Subject to the Plan.

Subject to adjustment as provided below, the total number of shares of Stock reserved and available for issuance in connection with the Plan is Ten Million Four Hundred Ninety Thousand Seven Hundred Eighty-Four (10,490,784). Any Stock issued hereunder may consist, in whole or in part, of authorized and unissued shares or treasury shares. If there is a merger, reorganization, consolidation, recapitalization, share dividend, share split, reverse split, combination of shares or other change in corporate structure of the Company affecting the Stock, such substitution or adjustment shall be made in the aggregate number of shares of Stock reserved for issuance under the Plan, and in the number of shares deemed to be held in any Account, as may be approved by the Committee in its sole discretion.

IN WITNESS WHEREOF, the Company has caused this instrument to be executed by its duly authorized officers as of this 10th day of May, 2018.

THE PROGRESSIVE CORPORATION

By:    /s/ Daniel P. Mascaro            

Title:Vice President and Secretary    

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EX-31.1

Exhibit 31.1

CERTIFICATION

I, Susan Patricia Griffith, certify that:

1. I have reviewed this quarterly report on Form 10-Q of The Progressive Corporation;

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; and

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 the 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.

Date: July 31, 2018

/s/ Susan Patricia Griffith

Susan Patricia Griffith

President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, John P. Sauerland, certify that:

1. I have reviewed this quarterly report on Form 10-Q of The Progressive Corporation;

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; and

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 the 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.

Date: July 31, 2018

/s/ John P. Sauerland

John P. Sauerland

Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

SECTION 1350 CERTIFICATION

I, Susan Patricia Griffith, President and Chief Executive Officer of The Progressive Corporation (the “Company”), certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, that:

(1) the Quarterly Report on Form 10-Q of the Company for the period ended June 30, 2018 (the “Report”), which this certification accompanies, fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and

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

/s/ Susan Patricia Griffith

Susan Patricia Griffith

President and Chief Executive Officer

July 31, 2018

EX-32.2

Exhibit 32.2

SECTION 1350 CERTIFICATION

I, John P. Sauerland, Chief Financial Officer of The Progressive Corporation (the “Company”), certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, that:

(1) the Quarterly Report on Form 10-Q of the Company for the period ended June 30, 2018 (the “Report”), which this certification accompanies, fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and

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

/s/ John P. Sauerland

John P. Sauerland

Vice President and Chief Financial Officer

July 31, 2018

EX-99

Exhibit 99

Letter to Shareholders

Second Quarter 2018

Most of you are very familiar with our stated Vision of becoming consumers’ number one choice and destination for auto and other insurance. We are thrilled to announce that we have moved up one space, from #4 to #3, in the private passenger auto marketplace, getting us one big step closer to our ultimate goal. It starts with having the greatest people in the industry (I’m a little biased), a values-based culture, and considering the needs of the 19 million customers that we have the privilege to serve. It is not lost on anyone at Progressive that it took a lot of hard work and dedication to earn this spot, and we can never take that for granted. That said, my sincere thanks to the nearly 36 thousand Progressive people on this incredible achievement.    

The calm weather we enjoyed during the first quarter of the year shifted in May and June as 19 new catastrophes were declared in the second quarter. These events were wide ranging from hailstorms in Colorado, Texas, Kansas, New Mexico, and Oklahoma to flash flooding in Texas and of course the widely publicized Mt. Kilauea eruption in Hawaii. The impact to our results, from all the catastrophes this quarter, total $125 million for our vehicle businesses and $82 million, after reinsurance, for our Property business. Despite this activity, our companywide catastrophe losses were down 12% over the second quarter last year and were 26% lower than the first half of 2017.

As always, we were well prepared to take on these claims in addition to our daily work. Having completed the rollout of our new customer-focused claims communications infrastructure, as well as making several technology investments, assisted with these efforts. The new infrastructure provides our customers and claims representatives multiple options for communications in our quest to provide a more personalized claims experience for our customers. More details on this later. We also leased space for a catastrophe claims handling facility in Nashville, Tennessee, which is expected to open in August. This facility will provide additional capacity to allow us to handle a large catastrophe event, primarily for our Property business, if necessary.

As we wrap up the first half of the year, we continue to be pleased with our results. Our year-to-date (YTD) combined ratio (CR) is a solid 89.7 with approximately 21% growth in net premiums written. Consistent strong new application growth, frequency trends, and retention all play a part in these robust numbers.

We continue to be excited about growth in Robinsons (auto plus home customers) from HomeQuote Explorer^® (HQX), the direct online multi-carrier homeowner insurance shopping experience that we launched in March 2017. HQX continues to deliver efficiency gains in our sales funnel. Last quarter I mentioned a successful pilot where we incorporated HQX into our online bundled auto and home quoting experience. We were able to roll this out in all states where HQX is available during the second quarter, which provided a nice lift to our bundled auto and home sales.

In May, Progressive Property became the third carrier to offer the ability to buy online through the HQX platform. The vast majority of our homeowner quotes originate online and consumers have indicated a preference to stay online through the buy process. Meeting their needs through online buy button functionality is expected to both increase sales yield and lower operating costs, as today many of these shoppers are calling in to purchase their Progressive Home policies. The buy button is currently offered in one state (Wisconsin), but we plan to roll out to other states. Finally, HQX has given us a nice feature to promote in our advertising. Two TV ads focused on HQX have been aired to date, and both have been very effective in driving both new auto and home sales. 

Commercial auto demand in both channels remained strong through the second quarter peak season aided by a generally strong economy and still limited options for commercial auto customers and agents. We are comfortable with our rate level based on ongoing adjustments and monitoring and we removed a number of underwriting restrictions early in the quarter. Some truck underwriting restrictions remain in place in California, Florida, and a few select markets.

We are pleased with the market adoption of our Smart Haul^® usage-based insurance program for our For-Hire Transportation policyholders and we continue to build momentum. Take rate is trending up as enforcement of the Electronic Logging Device (ELD) mandate takes hold and agents gain comfort with presenting the option. As more operators are presenting the required ELD-based driving history, we are able to offer steeper discounts to the best drivers. Smart Haul has us well positioned to offer very competitive rates to the best owners/operators.

In March, we expanded our footprint with Uber to four states. During the second quarter 2018, we recognized significant incremental revenue for our Transportation Network Company (TNC) business with net premiums earned up nearly 120% over the first quarter. We continue to gain confidence in our pricing of this new product and look forward to working with Uber on improving safety and lowering loss costs as the platform continues to grow.

For the second quarter, our investment portfolio earned a total return of 0.6%, as volatility remained high across financial markets. Equities were the largest contributor to our return, with a 3.1% second quarter performance, supported by robust corporate earnings growth. Our exposure to market volatility is relatively limited due to the high quality, short duration construction of our portfolio. We added to our corporate bond portfolio as valuations became more attractive throughout the course of the second quarter. The movement higher in interest rates and more attractive valuations in certain fixed income risk asset classes has the potential to improve our portfolio yields in the intermediate term.

As mentioned earlier, we have made sizable investments in the design and implementation of process and technology advancements for and on behalf of our customers in both the Customer Relationship Management (CRM) organization and our Claims organization. As promised earlier, this update will give you more details on the Claims investments. You will hear details of the CRM investments from CRM President John Murphy and Chief Information Officer Steve Broz during the second quarter Investor Relations Webcast.

Taking care of our customers and giving them a reason to stay after they’ve had a loss has always been central to claims at Progressive. We currently offer a convenient, self-serve photo estimate option. In the 18 months following the full rollout of our photo estimating solution, customers have submitted over 6.3 million photos and 6+ terabytes of video to us in order to get an estimate completed for their damages. Nearly 3 out of 4 eligible customers accept the process when we offer it to them and approximately 20% of our estimates are currently completed using this method of inspection. Selection of the photo estimate process gives our customers the choice of where and when they want to take photos and video, while returning to them a completed estimate an average of two days faster than traditional methods of inspection. We also offered a photo estimate option to eligible total loss customers affected by Hurricanes Harvey and Irma last year and approximately 1/4 of our customers chose this option and saw the cycle time of their claim significantly reduced.

In August, we plan to begin testing a machine learning algorithm within our estimate workflow to point out potential, real-time accuracy opportunities. This workflow is an integrated Artificial Intelligence solution leveraging virtual computing and machine learning (prior estimates/photos) to confirm and assess damage and indicate whether more photos are needed for analysis. We anticipate this being the first step to testing a guided estimating tool, which can partially automate the writing of an estimate within the next year.

Our significant investments in technology give our customers enhanced visibility, communication, and control over their claim experience.  Our text messaging solution has further simplified communications and, in fact, our claims representatives have interacted with our customers over 3 million times by utilizing our new texting solution that was implemented in late February. In addition, we have also recently deployed the capability for customers to electronically sign select documents and over 11,000 forms have been recently completed via eSign during our initial pilot period.

Finally, we have developed an internally-built leadership intervention system that supports our quality and customer service objectives. It aggregates data from multiple sources to identify situations where a leader’s intervention may improve our claims handling. This system is a key component of our Claims quality program and provides front-line claims leaders with a digital dashboard displaying specific claims where intervention and/or coaching opportunities may exist. In fact, in 2017, this system identified over 2 million claims where a leader could intervene real-time to

help produce higher quality and improved customer service. This has been a key technology advancement during this high-growth period.

As we continue to improve our customers’ experiences, we also have to continue to plan for the future. Progressive has experienced industry-leading growth and shareholder returns over the past 5 years. Our premiums have shown a compounded annual growth of 11%, comprehensive return on equity has averaged 18%, and our stock price has appreciated 25% annually over this period. These results are nothing short of remarkable and they happen because of this incredible 36 thousand person team we have at Progressive. Current operations continue to be refined and optimized. Our strategy of people/culture, brand/experience, price/segmentation, and broader needs is well positioned to continue our near-term momentum. During this time of strong performance, we also see threats and opportunities for our industry as we look to the future. It’s always been my motto to continually think about the future and especially in good times versus when you are forced to.

In December of 2017, we formed an eleven-person Strategy Council comprised of Progressive people, throughout the organization, to take some time to understand future trends and market shaping forces. I’ve talked to you, in the past, on how we are investing concurrently in three Horizons. This team has been focusing on Horizon three where we believe there are many areas where we can use our skills to define ideas for future business initiatives and invest in areas where we believe we can win, with our goal being to have an enduring company that is always growing.

This incredibly talented team has been doing this work in addition to their day job. With what we have learned from the work done by the Strategy Council, we decided that it was time to have a full-time dedicated team. Effective July 1, 2018, Andrew Quigg began reporting directly to me as our Chief Strategy Officer and will lead this team.

Andrew, a graduate from Yale with a degree in applied mathematics and economics and a Harvard MBA, has been with Progressive since 2007. During his tenure, Andrew has held various leadership positions, including Agency Auto Product Manager, Business Leader for Direct Media Buying, and most recently as our Customer Experience General Manager, building our current team focused on process improvements for our customers and on retention. Prior to joining Progressive, Andrew worked at Merrill Lynch, General Mills, and McKinsey. His extensive experience and educational background made him the perfect choice for this position.

Community involvement is also an important part of who we are at Progressive. In April, we celebrated the fifth anniversary of our STEM (science, technology, engineering, and math) program. The courses, offered across the country at local schools and taught by our employees, are designed to inspire students to pursue STEM skills using insurance concepts. The STEM program features seven Crash Course offerings for students in grades 3 through 12. A cross-functional volunteer team develops lessons ranging from the basics of insurance and programming to the physics of an accident and the software development life cycle. Each one employs STEM-related concepts to show how we use math, technology, and science in our business.

During the STEM Progress program's five-year history, more than 1,000 different employees have taught:

• 26,000 students in 31 states  

• 275 schools

• 1,010 classes

It has been a pleasure to give our employees the opportunity to connect with their communities and teach these important skills to the next generation of the workforce.

As I reflect on my first two years as CEO, I continue to be extremely proud of the team we have built at Progressive and grateful to lead this incredible organization. Together, we know that we can continue to achieve great things.

/s/ Tricia

Tricia Griffith

President and Chief Executive Officer

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Document and Entity Information	6 Months Ended
	Jun. 30, 2018 shares
Document Document And Entity Information [Abstract]
Entity Registrant Name	PROGRESSIVE CORP/OH/
Entity Central Index Key	0000080661
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Trading Symbol	PGR
Entity Common Stock, Shares Outstanding	582,512,182

XML

Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues
Net premiums earned		$ 7,634.2	$ 6,313.3	$ 14,808.2	$ 12,340.0
Period over prior year period percent change in net premiums earned		21.00%		20.00%
Investment income		$ 192.1	138.8	$ 358.4	268.0
Period over prior year period percent change in investment income		38.00%		34.00%
Net realized gains (losses) on securities:
Gross Realized Gain (Loss), excluding Holding Period and OTTI		$ (9.6)	45.5	$ 97.4	97.6
Net Holding Period Realized Gain (Loss)		53.5	0.4	(101.7)	1.2
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net		(11.1)	(13.8)	(11.1)	(14.8)
Total net realized gains (losses) on securities		$ 32.8	32.1	$ (15.4)	84.0
Period Over Prior Year Period, Percent Increase (Decrease), Net Realized Gains (Losses) On Security Sales		(121.00%)		0.00%
Period Over Prior Year Period, Percent Increase (Decrease), Net Impairment Losses Recognized In Earnings		(20.00%)		(25.00%)
Period Over Prior Year Period, Percent Increase (Decrease), Total Net Realized Gains (Losses) On Securities		2.00%		(118.00%)
Fees and other revenues		$ 116.0	88.8	$ 219.8	174.0
Period over prior year period percent change in fees and other revenues		31.00%		26.00%
Service revenues		$ 42.9	32.7	$ 77.1	61.2
Period over prior year period percent change in service revenues		31.00%		26.00%
Other gains (losses)		$ 0.0	0.0	$ 0.0	0.2
Period Over Prior Year Period, Percent Increase (Decrease), Other Gains (Losses)				(100.00%)
Total revenues		$ 8,018.0	6,605.7	$ 15,448.1	12,927.4
Period over prior year period percent change in total revenues		21.00%		19.00%
Expenses
Losses and loss adjustment expenses		$ 5,375.3	4,614.9	$ 10,246.1	8,878.3
Period over prior year period percent change in losses and loss adjustment expenses		16.00%		15.00%
Policy acquisition costs		$ 630.8	514.2	$ 1,227.0	1,017.1
Period over prior year period percent change in policy acquisition costs		23.00%		21.00%
Other underwriting expenses		$ 1,046.9	845.0	$ 2,027.1	1,690.6
Period over prior year period percent change in other underwriting expenses		24.00%		20.00%
Investment expenses		$ 6.2	6.6	$ 12.2	12.2
Period over prior year period percent change in investment expenses		(6.00%)		0.00%
Service expenses		$ 37.0	27.0	$ 66.3	52.9
Period over prior year period percent change in service expenses		37.00%		25.00%
Interest expense		$ 41.7	43.4	$ 78.5	80.2
Period over prior year period percent change in interest expense		(4.00%)		(2.00%)
Total expenses		$ 7,137.9	6,051.1	$ 13,657.2	11,731.3
Period over prior year period percent change in total expenses		18.00%		16.00%
Net Income
Income before income taxes		$ 880.1	554.6	$ 1,790.9	1,196.1
Period over prior year period percent change in income before income taxes		59.00%		50.00%
Provision for income taxes		$ 178.9	181.9	$ 359.9	393.1
Period over prior year period percent change in provision for income taxes		(2.00%)		(8.00%)
Net income		$ 701.2	372.7	$ 1,431.0	803.0
Period over prior year period percent change in net income		88.00%		78.00%
Net (income) loss attributable to noncontrolling interest (NCI)		$ 3.0	(5.1)	$ (8.8)	(11.1)
Period over prior year period percent change in net (income) loss attributable to noncontrolling interest		(159.00%)		(21.00%)
Net income attributable to Progressive		$ 704.2	367.6	$ 1,422.2	791.9
Period over prior year period percent change in net income attributable to Progressive		92.00%		80.00%
Other Comprehensive Income (Loss)
Total net unrealized gains (losses) on securities		$ (50.1)	92.6	$ (204.6)	225.0
Period over prior year period percent change in total net unrealized gains (losses) on securities		(154.00%)		(191.00%)
Net unrealized losses on forecasted transactions		$ 0.2	(8.0)	$ 0.4	(5.7)
Period Over Prior Year Period, Percent Increase (Decrease), Unrealized Gain (Loss) On Forecasted Transactions		(103.00%)		(107.00%)
Foreign currency translation adjustment		$ 0.0	(0.1)	$ 0.0	0.2
Period over prior year period percent change in foreign currency translation adjustment		(100.00%)		(100.00%)
Other comprehensive income (loss)		$ (49.9)	84.5	$ (204.2)	219.5
Period over prior year period percent change in other comprehensive income		(159.00%)		(193.00%)
Other comprehensive (income) loss attributable to NCI		$ 0.6	(1.3)	$ 4.6	(2.2)
Period over prior year period change in Comprehensive (income) loss attributable to NCI		(146.00%)		(309.00%)
Comprehensive income attributable to Progressive		$ 654.9	450.8	$ 1,222.6	1,009.2
Period over prior year period percent change in comprehensive income		45.00%		21.00%
Computation of Per Share Earnings Available to Progressive Common Shareholders
Net income attributable to Progressive		$ 704.2	367.6	$ 1,422.2	791.9
Period over prior year period percent change in net income attributable to Progressive		92.00%		80.00%
Preferred Stock Dividends, Income Statement Impact		$ 6.7	0.0	$ 7.9	0.0
Net Income (Loss) Available to Common Stockholders, Basic		$ 697.5	$ 367.6	$ 1,414.3	$ 791.9
Period Over Prior Year Period, Percent Increase (Decrease), Net Income (Loss) Available to Common Stockholders		90.00%		79.00%
Average common shares outstanding - Basic		582.0	580.5	582.0	580.4
Period over prior year period percent change in average shares outstanding - basic		0.00%		0.00%
Net effect of dilutive stock-based compensation		3.8	3.3	3.6	3.1
Period over prior year period percent change in net effect of dilutive stock-based compensation		15.00%		16.00%
Total average equivalent common shares - Diluted		585.8	583.8	585.6	583.5
Period over prior year period percent change in total equivalent shares - diluted		0.00%		0.00%
Basic: Earnings per common share		$ 1.20	$ 0.63	$ 2.43	$ 1.36
Period over prior year period percent change in basic: earnings per share		89.00%		78.00%
Diluted: Earnings per common share		$ 1.19	0.63	$ 2.42	1.36
Period over prior year period percent change in diluted: earnings per share		89.00%		78.00%
Dividends declared per share	[1]	$ 0	$ 0	$ 0	$ 0

[1] Progressive maintains an annual variable common share dividend program. See Note 9 – Dividends for further discussion.

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Consolidated Balance Sheets - USD ($) $ in Millions		Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Available-for-sale securities, at fair value:
Debt Securities, Available-for-sale, Fixed Maturities		$ 23,789.2	$ 20,201.7	$ 18,388.1
Short-term investments (amortized cost: $3,231.2, $3,729.7, and $2,869.4)		3,231.2	2,869.4	3,729.7
Fixed maturities (amortized cost: $24,061.8, $18,311.7, and $20,209.9)		27,020.4	23,071.1	22,117.8
Equity securities, at fair value:
Equity Securities FV NI Nonredeemable Preferred Stock		758.6	803.8	783.1
Equity Securities FV NI Common Equities		3,142.2	3,399.8	3,077.5
Equity Securities, FV-NI		3,900.8	4,203.6	3,860.6
Investments, Fair Value Disclosure		30,921.2	27,274.7	25,978.4
Cash and cash equivalents		154.8	265.0	161.0
Restricted Cash		2.9	10.3	0.8
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		157.7	275.3	161.8
Accrued investment income		146.3	119.7	112.1
Premiums receivable, net of allowance for doubtful accounts of $210.5, $175.8, and $210.9		6,230.2	5,422.5	5,091.3
Reinsurance recoverables, including $117.6, $79.2, and $103.3 on paid losses and loss adjustment expenses		2,410.7	2,273.4	2,027.1
Prepaid reinsurance premiums		289.8	203.3	212.6
Deferred acquisition costs		895.7	780.5	727.2
Property and equipment, net of accumulated depreciation of $984.7, $894.7, and $940.6		1,116.4	1,119.6	1,152.1
Goodwill		452.7	452.7	452.7
Intangible assets, net of accumulated amortization of $211.7, $140.5, and $175.7		330.6	366.6	401.8
Other assets		412.2	412.9	372.7
Total assets		43,363.5	38,701.2	36,689.8
Liabilities
Unearned premiums		10,245.9	8,903.5	8,407.7
Loss and loss adjustment expense reserves		14,070.8	13,086.9	12,060.4
Net deferred income taxes		46.0	135.0	191.8
Accounts payable, accrued expenses, and other liabilities		3,922.3	3,481.0	3,153.2
Debt	[1]	3,859.5	3,306.3	3,383.4
Total liabilities		32,144.5	28,912.7	27,196.5
Redeemable noncontrolling interest (NCI)	[2]	218.2	503.7	501.8
Serial Preferred Shares, Series B, no par value (cumulative, liquidation preference $1,000 per share) (authorized, issued, and outstanding 0.5, 0, and 0)		493.9	0.0	0.0
Common shares, $1.00 par value (authorized 900.0; issued 797.5, including treasury shares of 215.0, 216.5, and 215.8)		582.5	581.7	581.0
Paid-in capital		1,425.9	1,389.2	1,351.0
Retained earnings		8,720.4	6,031.7	5,908.8
Accumulated other comprehensive income:
Net unrealized gains (losses) on securities		(210.9)	1,295.0	1,164.6
Net unrealized losses on forecasted transactions		(17.6)	(14.8)	(15.1)
Foreign currency translation adjustment		0.0	0.0	(0.9)
Accumulated other comprehensive (income) loss attributable to NCI		6.6	2.0	2.1
Total accumulated other comprehensive income attributable to Progressive		(221.9)	1,282.2	1,150.7
Total shareholders’ equity		11,000.8	9,284.8	8,991.5
Total liabilities, redeemable NCI, and shareholders’ equity		$ 43,363.5	$ 38,701.2	$ 36,689.8

[1] Consists of long-term debt. See Note 4 – Debt for further discussion.

[2] See Note 12 – Redeemable Noncontrolling Interest for further discussion.

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Fixed maturities, amortized cost	$ 24,061.8	$ 20,209.9	$ 18,311.7
Nonredeemable preferred stocks, cost	677.0	698.6	666.0
Common equities, cost	1,314.0	1,499.0	1,472.3
Short-term investments, amortized cost	3,231.2	2,869.4	3,729.7
Premiums receivable, allowance for doubtful accounts	210.5	210.9	175.8
Reinsurance recoverables, paid losses and loss adjustment expenses	117.6	103.3	79.2
Intangible Assets, Accumulated Amortization	211.7	175.7	140.5
Property and equipment, accumulated depreciation	$ 984.7	$ 940.6	$ 894.7
Common Shares, par value (USD per share)	$ 1.00	$ 1.00	$ 1.00
Common Shares, authorized (shares)	900,000,000	900,000,000.0	900,000,000
Common Shares, issued (shares)	797,500,000	797,500,000	797,500,000
Common Shares, treasury shares (shares)	215,000,000	215,800,000	216,500,000
Serial Preferred Stock [Member]
Preferred Stock, Shares Authorized (shares)	20,000,000	20,000,000	20,000,000
Series B Preferred Stock [Member]
Preferred Stock, No Par Value	$ 0		$ 0
Preferred Stock, Liquidation Preference Per Share (USD per share)		$ 0	0
Series B Preferred Stock [Member] | Serial Preferred Stock [Member]
Preferred Stock, No Par Value	$ 0	$ 0	$ 0
Preferred Stock, Shares Authorized (shares)	500,000.0	0	0
Preferred Stock, Shares Issued (shares)	500,000.0	0	0
Preferred Stock, Shares Outstanding (shares)	500,000.0	0	0
Preferred Stock, Liquidation Preference Per Share (USD per share)	$ 1,000

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Consolidated Statements of Changes in Shareholders' Equity Statement - USD ($) $ in Millions		Total	Preferred Shares, No Par Value	Common Shares, $1.00 Par Value	Paid-in Capital	Retained Earnings	AOCI Attributable to Parent [Member]	Series B Preferred Stock [Member]	Voting Preference Shares [Member]
Balance, Beginning of period at Dec. 31, 2016			$ 0.0	$ 579.9	$ 1,303.4	$ 5,140.4	$ 933.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, New Issues			0.0
Net income attributable to Progressive		$ 791.9				791.9
Treasury shares purchased				(0.7)	(1.5)	(21.9)
Stock Issued During Period, Value, Restricted Stock Award, Gross				1.8	(1.8)
Amortization of equity-based compensation					52.2
Reinvested dividends on restricted stock units					0.1	(0.1)
Adjustment to carrying amount of redeemable noncontrolling interest		1.4			(1.4)
Attributable to noncontrolling interest		(2.2)					(2.2)
Other comprehensive income							219.5
Other, net						(1.5)
Balance, End of period at Jun. 30, 2017		8,991.5	0.0	581.0	1,351.0	5,908.8	1,150.7
Balance, Beginning of period at Dec. 31, 2016			0.0	579.9	1,303.4	5,140.4	933.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment to carrying amount of redeemable noncontrolling interest		8.4
Attributable to noncontrolling interest		(2.3)
Balance, End of period at Dec. 31, 2017		9,284.8	0.0	581.7	1,389.2	6,031.7	1,282.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification of Stranded Amounts in AOCI to Retained Earnings | Accounting Standards Update 2018-02 [Member]		4.3
Net income attributable to Progressive		367.6
Attributable to noncontrolling interest		(1.3)
Balance, End of period at Jun. 30, 2017		$ 8,991.5	0.0	581.0	1,351.0	5,908.8	1,150.7
Preferred Stock, No Par Value								$ 0
Preferred Stock, Shares Authorized (shares)									5,000,000.0
Preferred Stock, Shares Issued (shares)									0
Common Shares, par value (USD per share)		$ 1.00
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-01 [Member]	[1]					0.0	0.0
Reclassification of Stranded Amounts in AOCI to Retained Earnings | Accounting Standards Update 2018-02 [Member]	[1]					0.0	0.0
Common Shares, par value (USD per share)		$ 1.00
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 1,300.2
Reclassification of Stranded Amounts in AOCI to Retained Earnings		4.3
Balance, Beginning of period at Dec. 31, 2017		9,284.8	0.0	581.7	1,389.2	6,031.7	1,282.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, New Issues			493.9
Net income attributable to Progressive		1,422.2				1,422.2
Treasury shares purchased				(0.7)	(1.7)	(37.0)
Stock Issued During Period, Value, Restricted Stock Award, Gross				1.5	(1.5)
Amortization of equity-based compensation					37.5
Reinvested dividends on restricted stock units					(0.8)	0.8
Adjustment to carrying amount of redeemable noncontrolling interest		(3.2)			3.2
Attributable to noncontrolling interest		4.6					4.6
Other comprehensive income							(204.2)
Other, net						(1.8)
Balance, End of period at Jun. 30, 2018		11,000.8	493.9	582.5	1,425.9	8,720.4	(221.9)
Preferred Stock, Shares Issued (shares)								500,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to Progressive		704.2
Attributable to noncontrolling interest		0.6
Balance, End of period at Jun. 30, 2018		$ 11,000.8	$ 493.9	$ 582.5	$ 1,425.9	8,720.4	(221.9)
Preferred Stock, No Par Value								$ 0
Preferred Stock, Shares Authorized (shares)									5,000,000.0
Preferred Stock, Shares Issued (shares)									0
Common Shares, par value (USD per share)		$ 1.00
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-01 [Member]	[1]					1,300.2	(1,300.2)
Reclassification of Stranded Amounts in AOCI to Retained Earnings | Accounting Standards Update 2018-02 [Member]	[1]					$ 4.3	$ (4.3)

[1] See Note 14 – New Accounting Standards for further discussion.

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Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Statement of Cash Flows [Abstract]
Net income	$ 1,431.0	$ 803.0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	86.6	84.0
Amortization of intangible assets	36.0	31.0
Net amortization of fixed-income securities	23.2	44.1
Amortization of equity-based compensation	38.5	53.9
Net realized (gains) losses on securities	15.4	(84.0)
Net (gains) losses on disposition of property and equipment	1.7	3.2
Other (gains) losses	0.0	(0.2)
Changes in:
Premiums receivable	(807.7)	(582.0)
Reinsurance recoverables	(137.3)	(142.4)
Prepaid reinsurance premiums	(86.5)	(42.1)
Deferred acquisition costs	(115.2)	(76.0)
Income taxes	2.0	(64.3)
Unearned premiums	1,342.4	939.0
Loss and loss adjustment expense reserves	983.9	692.3
Accounts payable, accrued expenses, and other liabilities	700.4	430.2
Other, net	(31.1)	(67.1)
Net cash provided by operating activities	3,483.3	2,022.6
Purchases:
Fixed maturities	(10,780.0)	(6,803.3)
Equity securities	(136.4)	(89.5)
Sales:
Fixed maturities	3,916.1	2,359.9
Equity securities	460.0	133.3
Maturities, paydowns, calls, and other:
Fixed maturities	2,936.2	2,413.5
Equity securities	15.0	50.0
Net sales (purchases) of short-term investments	(343.8)	(146.8)
Net unsettled security transactions	367.9	259.3
Purchases of property and equipment	(102.0)	(73.2)
Sales of property and equipment	6.7	12.5
Payments to Acquire Additional Interest in Subsidiaries	(295.9)	0.0
Payments to Acquire Businesses, Net of Cash Acquired	0.0	(18.1)
Net cash used in investing activities	(3,956.2)	(1,902.4)
Cash Flows From Financing Activities
Net proceeds from issuance of Serial Preferred Shares, Series B	493.9	0.0
Net proceeds from debt issuance	589.5	841.1
Payments of debt	(37.1)	(12.5)
Redemption/reacquisition of subordinated debt	0.0	(594.4)
Dividends paid to common shareholders	(654.9)	(395.4)
Proceeds from exercise of equity options	3.3	0.5
Acquisition of treasury shares for restricted stock tax liabilities	(39.0)	(24.1)
Acquisition of treasury shares acquired in open market	(0.4)	0.0
Net cash provided by (used in) financing activities	355.3	(184.8)
Decrease in cash, cash equivalents, and restricted cash	(117.6)	(64.6)
Cash, cash equivalents, and restricted cash – January 1	275.3	226.4
Cash, cash equivalents, and restricted cash - March 31	$ 157.7	$ 161.8

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Basis of Presentation

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation — The accompanying consolidated financial statements include the accounts of The Progressive Corporation and ARX Holding Corp. (ARX), and their respective wholly owned insurance and non-insurance subsidiaries and affiliates in which Progressive or ARX has a controlling financial interest. The Progressive Corporation owned 86.7% of the outstanding capital stock of ARX at June 30, 2018 and 69.0% at June 30, 2017 and December 31, 2017. The increase in Progressive’s ownership of ARX at June 30, 2018, is due to the minority ARX shareholders who “put” 204,527 of their ARX shares during the second quarter 2018, including exercised stock options, to Progressive pursuant to the stockholders’ agreement. All intercompany accounts and transactions are eliminated in consolidation.

The consolidated financial statements reflect all normal recurring adjustments that, in the opinion of management, were necessary for a fair statement of the results for the interim periods presented. The results of operations for the period ended June 30, 2018, are not necessarily indicative of the results expected for the full year. These consolidated financial statements and the notes thereto should be read in conjunction with Progressive’s audited financial statements and accompanying notes included in Exhibit 13 to our Annual Report on Form 10-K for the year ended December 31, 2017 (“2017 Annual Report to Shareholders”).

Other assets on the consolidated balance sheets include properties that are considered “held for sale,” if any. The fair value of these properties, less the estimated cost to sell them, was $17.4 million at June 30, 2018 and $5.3 million at December 31, 2017. No properties were held for sale at June 30, 2017.

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Investments

6 Months Ended

Jun. 30, 2018

Investments Schedule [Abstract]

Investments

Investments — The following tables present the composition of our investment portfolio by major security type, consistent with our classification of how we manage, monitor, and measure the portfolio. Our securities are reported in our Consolidated Balance Sheets at fair value, with all of our equity securities having a readily determinable fair value. The changes in fair value for our fixed-maturity securities (other than hybrid securities) are reported as a component of accumulated other comprehensive income, net of deferred income taxes, in our Consolidated Balance Sheets.

The net holding period gains (losses) reported below represent the inception-to-date changes in fair value. The changes in the net holding period gains (losses) between periods for the hybrid securities and, beginning in 2018, equity securities are recorded as a component of net realized gains (losses) on securities in our Consolidated Statements of Comprehensive Income. Prior to 2018, the change in fair value of our equity securities was part of accumulated other comprehensive income (see Note 14 – New Accounting Standards for further discussion).

($ in millions)	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Net Holding Period Gains (Losses)			Fair Value		% of Total Fair Value
June 30, 2018
Available-for-sale securities:
Fixed maturities:
U.S. government obligations	$	8,005.8	$	0.9	$	(141.3	)	$	0		$	7,865.4	25.4	%
State and local government obligations	1,678.9		4.3		(15.9		)	0			1,667.3		5.4
Foreign government obligations	0		0		0			0			0		0
Corporate debt securities	7,422.4		4.2		(94.3		)	(2.0		)	7,330.3		23.7
Residential mortgage-backed securities	819.6		8.4		(5.4		)	0			822.6		2.7
Commercial mortgage-backed securities	2,725.5		2.9		(31.5		)	0			2,696.9		8.7
Other asset-backed securities	3,189.2		2.0		(13.7		)	0.1			3,177.6		10.3
Redeemable preferred stocks	220.4		14.1		(2.0		)	(3.4		)	229.1		0.7
Total fixed maturities	24,061.8		36.8		(304.1		)	(5.3		)	23,789.2		76.9
Short-term investments	3,231.2		0		0			0			3,231.2		10.5
Total available-for-sale securities	27,293.0		36.8		(304.1		)	(5.3		)	27,020.4		87.4
Equity securities:
Nonredeemable preferred stocks	677.0		0		0			81.6			758.6		2.4
Common equities	1,314.0		0		0			1,828.2			3,142.2		10.2
Total equity securities	1,991.0		0		0			1,909.8			3,900.8		12.6
Total portfolio1,2	$	29,284.0	$	36.8	$	(304.1	)	$	1,904.5		$	30,921.2	100.0	%

($ in millions)	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Net Holding Period Gains (Losses)		Fair Value		% of Total Fair Value
June 30, 2017
Fixed maturities:
U.S. government obligations	$	4,166.4	$	4.4	$	(15.8	)	$	0	$	4,155.0	16.0	%
State and local government obligations	2,473.3		32.5		(5.9		)	0.2		2,500.1		9.7
Foreign government obligations	22.5		0		0			0		22.5		0.1
Corporate debt securities	4,991.6		29.4		(7.6		)	0.4		5,013.8		19.3
Residential mortgage-backed securities	1,260.3		10.9		(5.9		)	2.3		1,267.6		4.8
Commercial mortgage-backed securities	2,364.9		19.8		(9.7		)	0		2,375.0		9.1
Other asset-backed securities	2,843.3		6.4		(2.5		)	0.2		2,847.4		11.0
Redeemable preferred stocks	189.4		19.0		(1.7		)	0		206.7		0.8
Total fixed maturities	18,311.7		122.4		(49.1		)	3.1		18,388.1		70.8
Equity securities:
Nonredeemable preferred stocks	666.0		123.6		(6.5		)	0		783.1		3.0
Common equities	1,472.3		1,611.7		(6.5		)	0		3,077.5		11.8
Short-term investments	3,729.7		0		0			0		3,729.7		14.4
Total portfolio1,2	$	24,179.7	$	1,857.7	$	(62.1	)	$	3.1	$	25,978.4	100.0	%

($ in millions)	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Net Holding Period Gains (Losses)			Fair Value		% of Total Fair Value
December 31, 2017
Fixed maturities:
U.S. government obligations	$	6,688.8	$	1.1	$	(44.0	)	$	0		$	6,645.9	24.4	%
State and local government obligations	2,285.6		20.7		(9.3		)	0.1			2,297.1		8.4
Foreign government obligations	0		0		0			0			0		0
Corporate debt securities	4,997.2		14.8		(14.4		)	0.1			4,997.7		18.3
Residential mortgage-backed securities	828.8		11.3		(3.4		)	0			836.7		3.1
Commercial mortgage-backed securities	2,760.1		11.8		(13.3		)	0			2,758.6		10.1
Other asset-backed securities	2,454.5		4.5		(4.5		)	0.2			2,454.7		9.0
Redeemable preferred stocks	194.9		17.8		(1.5		)	(0.2		)	211.0		0.8
Total fixed maturities	20,209.9		82.0		(90.4		)	0.2			20,201.7		74.1
Equity securities:
Nonredeemable preferred stocks	698.6		114.0		(8.8		)	0			803.8		2.9
Common equities	1,499.0		1,901.0		(0.2		)	0			3,399.8		12.5
Short-term investments	2,869.4		0		0			0			2,869.4		10.5
Total portfolio1,2	$	25,276.9	$	2,097.0	$	(99.4	)	$	0.2		$	27,274.7	100.0	%

¹Our portfolio reflects the effect of unsettled security transactions; at June 30, 2018 and 2017, we had $362.1 million and $287.1 million, respectively, included in “other liabilities,” compared to $5.8 million included in “other assets” at December 31, 2017.

²The total fair value of the portfolio at June 30, 2018 and 2017, and December 31, 2017, included $1.7 billion, $1.1 billion, and $1.6 billion, respectively, of securities held in a consolidated, non-insurance subsidiary of the holding company, net of any unsettled security transactions.

Short-Term Investments Our short-term investments may include commercial paper and other investments that are expected to mature or are redeemable within one year.

We did not have any open repurchase or reverse repurchase transactions in our short-term investment portfolio at June 30, 2018 and 2017, or December 31, 2017. To the extent we enter into repurchase or reverse repurchase transactions, and consistent with past practice, we would elect not to offset these transactions and would report them on a gross basis on our balance sheets despite the option to elect to offset these transactions as long as they were with the same counterparty and subject to an enforceable master netting arrangement.

Hybrid Securities Included in our fixed-maturity securities are hybrid securities, which are reported at fair value:

	June 30,
(millions)	2018		2017		December 31, 2017
Fixed maturities:
State and local government obligations	$	3.6	$	6.6	$	6.1
Corporate debt securities	170.3		61.3		99.8
Residential mortgage-backed securities	0		189.7		0
Other asset-backed securities	5.5		7.7		6.7
Redeemable preferred stocks	67.3		0		30.3
Total hybrid securities	$	246.7	$	265.3	$	142.9

Certain securities in our portfolio are accounted for as hybrid securities because they contain embedded derivatives that are not deemed to be clearly and closely related to the host investments. Since the embedded derivative (e.g., change-in-control put option, debt-to-equity conversion, or any other feature unrelated to the credit quality or risk of default of the issuer that could impact the amount or timing of our expected future cash flows) does not have an observable intrinsic value, we have elected to record the change in fair value of the entire security through income as a realized gain or loss.

Fixed Maturities The composition of fixed maturities by maturity at June 30, 2018, was:

(millions)	Cost		Fair Value
Less than one year	$	3,805.2	$	3,809.2
One to five years	15,190.7		14,999.1
Five to ten years	4,939.7		4,855.4
Ten years or greater	126.2		125.5
Total	$	24,061.8	$	23,789.2

Asset-backed securities are classified in the maturity distribution table based upon their projected cash flows. All other securities which do not have a single maturity date are reported based upon expected average maturity. Contractual maturities may differ from expected maturities because the issuers of the securities may have the right to call or prepay obligations.

Gross Unrealized Losses As of June 30, 2018, we had $304.1 million of gross unrealized losses in our fixed-maturity securities. A review of our fixed-maturity securities indicated that the issuers were current with respect to their interest obligations and that there was no evidence of deterioration of the current cash flow projections that would indicate we would not receive the remaining principal at maturity.

The following tables show the composition of gross unrealized losses by major security type and by the length of time that individual securities have been in a continuous unrealized loss position:

	Total No. of Sec.	Total Fair Value		Gross Unrealized Losses			Less than 12 Months						12 Months or Greater
($ in millions)							No. of Sec.	Fair Value		Unrealized Losses			No. of Sec.	Fair Value		Unrealized Losses
June 30, 2018
Fixed maturities:
U.S. government obligations	70	$	7,503.2	$	(141.3	)	33	$	4,543.5	$	(73.6	)	37	$	2,959.7	$	(67.7	)
State and local government obligations	355	1,050.9		(15.9		)	219	631.9		(7.1		)	136	419.0		(8.8		)
Corporate debt securities	391	6,153.5		(94.3		)	322	5,439.3		(77.2		)	69	714.2		(17.1		)
Residential mortgage-backed securities	227	380.3		(5.4		)	52	188.6		(0.9		)	175	191.7		(4.5		)
Commercial mortgage-backed securities	142	2,300.9		(31.5		)	85	1,371.4		(14.4		)	57	929.5		(17.1		)
Other asset-backed securities	219	2,479.7		(13.7		)	148	2,055.1		(8.5		)	71	424.6		(5.2		)
Redeemable preferred stocks	3	30.2		(2.0		)	1	4.6		(0.2		)	2	25.6		(1.8		)
Total fixed maturities	1,407	$	19,898.7	$	(304.1	)	860	$	14,234.4	$	(181.9	)	547	$	5,664.3	$	(122.2	)

	Total No. of Sec.	Total Fair Value		Gross Unrealized Losses			Less than 12 Months						12 Months or Greater
($ in millions)							No. of Sec.	Fair Value		Unrealized Losses			No. of Sec.	Fair Value		Unrealized Losses
June 30, 2017
Fixed maturities:
U.S. government obligations	41	$	2,781.8	$	(15.8	)	39	$	2,725.1	$	(15.1	)	2	$	56.7	$	(0.7	)
State and local government obligations	222	818.7		(5.9		)	138	479.8		(3.3		)	84	338.9		(2.6		)
Corporate debt securities	143	1,905.2		(7.6		)	122	1,599.6		(5.3		)	21	305.6		(2.3		)
Residential mortgage-backed securities	220	535.7		(5.9		)	126	197.8		(1.1		)	94	337.9		(4.8		)
Commercial mortgage-backed securities	74	905.6		(9.7		)	52	679.5		(5.7		)	22	226.1		(4.0		)
Other asset-backed securities	160	2,077.8		(2.5		)	145	1,823.8		(1.9		)	15	254.0		(0.6		)
Redeemable preferred stocks	1	10.8		(1.7		)	0	0		0			1	10.8		(1.7		)
Total fixed maturities	861	9,035.6		(49.1		)	622	7,505.6		(32.4		)	239	1,530.0		(16.7		)
Equity securities:
Nonredeemable preferred stocks	3	73.1		(6.5		)	0	0		0			3	73.1		(6.5		)
Common equities	80	73.1		(6.5		)	74	72.3		(6.5		)	6	0.8		0
Total equity securities	83	146.2		(13.0		)	74	72.3		(6.5		)	9	73.9		(6.5		)
Total portfolio	944	$	9,181.8	$	(62.1	)	696	$	7,577.9	$	(38.9	)	248	$	1,603.9	$	(23.2	)

	Total No. of Sec.	Total Fair Value		Gross Unrealized Losses			Less than 12 Months						12 Months or Greater
($ in millions)							No. of Sec.	Fair Value		Unrealized Losses			No. of Sec.	Fair Value		Unrealized Losses
December 31, 2017
Fixed maturities:
U.S. government obligations	58	$	5,817.0	$	(44.0	)	41	$	4,869.3	$	(34.6	)	17	$	947.7	$	(9.4	)
State and local government obligations	358	1,200.3		(9.3		)	230	737.6		(4.4		)	128	462.7		(4.9		)
Corporate debt securities	222	2,979.4		(14.4		)	171	2,072.9		(9.1		)	51	906.5		(5.3		)
Residential mortgage-backed securities	201	300.9		(3.4		)	30	75.1		(0.2		)	171	225.8		(3.2		)
Commercial mortgage-backed securities	105	1,682.3		(13.3		)	63	1,221.2		(5.9		)	42	461.1		(7.4		)
Other asset-backed securities	197	1,837.3		(4.5		)	134	1,377.8		(3.3		)	63	459.5		(1.2		)
Redeemable preferred stocks	2	21.8		(1.5		)	1	10.8		(0.1		)	1	11.0		(1.4		)
Total fixed maturities	1,143	13,839.0		(90.4		)	670	10,364.7		(57.6		)	473	3,474.3		(32.8		)
Equity securities:
Nonredeemable preferred stocks	4	127.8		(8.8		)	1	56.5		(0.5		)	3	71.3		(8.3		)
Common equities	19	13.4		(0.2		)	18	13.4		(0.2		)	1	0		0
Total equity securities	23	141.2		(9.0		)	19	69.9		(0.7		)	4	71.3		(8.3		)
Total portfolio	1,166	$	13,980.2	$	(99.4	)	689	$	10,434.6	$	(58.3	)	477	$	3,545.6	$	(41.1	)

Since both June 30, 2017 and December 31, 2017, the number of securities in our fixed-maturity portfolio with unrealized losses increased, primarily the result of rising interest rates during the latter part of 2017 and early 2018. We had no material decreases in valuation as a result of credit rating downgrades and all of the securities in the table above are current with respect to required principal and interest payments.

Other-Than-Temporary Impairment (OTTI) The following table shows the total non-credit portion of the OTTI recorded in accumulated other comprehensive income, reflecting the original non-credit loss at the time the credit impairment was determined (i.e., unadjusted for valuation changes subsequent to the original write-down):

	June 30,						December 31, 2017
(millions)	2018			2017
Fixed maturities:
Residential mortgage-backed securities	$	(19.7	)	$	(19.7	)	$	(19.7	)
Commercial mortgage-backed securities	(0.3		)	(0.5		)	(0.3		)
Total fixed maturities	$	(20.0	)	$	(20.2	)	$	(20.0	)

The following tables provide rollforwards of the amounts related to credit losses recognized in earnings for the periods ended June 30, 2018 and 2017, for which a portion of the OTTI losses were also recognized in accumulated other comprehensive income at the time the credit impairments were determined and recognized:

	Three Months Ended June 30, 2018
	Mortgage-Backed
(millions)	Residential		Commercial		Total
Balance at March 31, 2018	$	0	$	0.5	$	0.5
Reductions for securities sold/matured	0		0		0
Change in recoveries of future cash flows expected to be collected1	0.3		0		0.3
Balance at June 30, 2018	$	0.3	$	0.5	$	0.8
	Six Months Ended June 30, 2018
	Mortgage-Backed
(millions)	Residential		Commercial		Total
Balance at December 31, 2017	$	0	$	0.5	$	0.5
Reductions for securities sold/matured	0		0		0
Change in recoveries of future cash flows expected to be collected1	0.3		0		0.3
Balance at June 30, 2018	$	0.3	$	0.5	$	0.8

	Three Months Ended June 30, 2017
	Mortgage-Backed
(millions)	Residential			Commercial			Total
Balance at March 31, 2017	$	11.4		$	0.1		$	11.5
Reductions for securities sold/matured	(11.4		)	0			(11.4		)
Change in recoveries of future cash flows expected to be collected1	0.2			0			0.2
Balance at June 30, 2017	$	0.2		$	0.1		$	0.3
	Six Months Ended June 30, 2017
	Mortgage-Backed
(millions)	Residential			Commercial			Total
Balance at December 31, 2016	$	11.1		$	0.4		$	11.5
Reductions for securities sold/matured	(10.9		)	(0.3		)	(11.2		)
Change in recoveries of future cash flows expected to be collected1	0			0			0
Balance at June 30, 2017	$	0.2		$	0.1		$	0.3

¹Reflects the current period change in the expected recovery of prior impairments that will be accreted into income over the remaining life of the security.

Although we determined it is more likely that we will not be required to sell the securities prior to the recovery of their respective cost bases (which could be maturity), we are required to measure the amount of potential credit losses on the securities that were in an unrealized loss position. In that process, we considered a number of factors and inputs related to the individual securities. The methodology and significant inputs used to measure the amount of credit losses in our portfolio included: current performance indicators on the business model or underlying assets (e.g., delinquency rates, foreclosure rates, and default rates); credit support (via current levels of subordination); historical credit ratings; and updated cash flow expectations based upon these performance indicators. In order to determine the amount of credit loss, if any, the net present value of the cash flows expected (i.e., expected recovery value) was calculated using the current book yield for each security, and was compared to its current amortized value. In the event that the net present value was below the amortized value, a credit loss would be deemed to exist, and the security would be written down. We did not have any credit impairment write-downs for the six months ended June 30, 2018 or 2017.

Realized Gains (Losses) The components of net realized gains (losses) for the three and six months ended June 30, were:

	Three Months						Six Months
(millions)	2018			2017			2018			2017
Gross realized gains on security sales
Available-for-sale securities:
U.S. government obligations	$	1.7		$	4.5		$	1.7		$	4.9
State and local government obligations	0.6			2.6			9.2			3.1
Corporate and other debt securities	0.3			7.3			0.4			11.4
Residential mortgage-backed securities	0			20.9			0			21.0
Commercial mortgage-backed securities	0.3			1.2			2.0			2.4
Other asset-backed securities	0.1			0			0.1			0.3
Redeemable preferred stocks	3.2			0			4.3			0.3
Total available-for-sale securities	6.2			36.5			17.7			43.4
Equity securities:
Nonredeemable preferred stocks	0			6.2			3.6			51.6
Common equities	18.5			9.9			138.4			17.3
Total equity securities	18.5			16.1			142.0			68.9
Subtotal gross realized gains on security sales	24.7			52.6			159.7			112.3
Gross realized losses on security sales
Available-for-sale securities:
U.S. government obligations	(29.9		)	(0.4		)	(38.8		)	(3.6		)
State and local government obligations	(0.6		)	0			(1.9		)	(0.1		)
Corporate and other debt securities	(1.0		)	(1.9		)	(4.1		)	(2.8		)
Residential mortgage-backed securities	0			(0.3		)	0			(0.3		)
Commercial mortgage-backed securities	0			(0.7		)	(6.3		)	(3.1		)
Other asset-backed securities	(0.9		)	0			(1.0		)	0
Total available-for-sale securities	(32.4		)	(3.3		)	(52.1		)	(9.9		)
Equity securities:
Nonredeemable preferred stocks	(1.9		)	(4.6		)	(2.3		)	(5.8		)
Common equities	0			0			(7.9		)	(0.1		)
Total equity securities	(1.9		)	(4.6		)	(10.2		)	(5.9		)
Subtotal gross realized losses on security sales	(34.3		)	(7.9		)	(62.3		)	(15.8		)
Net realized gains (losses) on security sales
Available-for-sale securities:
U.S. government obligations	(28.2		)	4.1			(37.1		)	1.3
State and local government obligations	0			2.6			7.3			3.0
Corporate and other debt securities	(0.7		)	5.4			(3.7		)	8.6
Residential mortgage-backed securities	0			20.6			0			20.7
Commercial mortgage-backed securities	0.3			0.5			(4.3		)	(0.7		)
Other asset-backed securities	(0.8		)	0			(0.9		)	0.3
Redeemable preferred stocks	3.2			0			4.3			0.3
Total available-for-sale securities	(26.2		)	33.2			(34.4		)	33.5
Equity securities:
Nonredeemable preferred stocks	(1.9		)	1.6			1.3			45.8
Common equities	18.5			9.9			130.5			17.2
Total equity securities	16.6			11.5			131.8			63.0
Litigation settlements and other gains (losses)	0			0.8			0			1.1
Subtotal net realized gains (losses) on security sales	(9.6		)	45.5			97.4			97.6
Net holding period gains (losses)
Hybrid securities	(2.3		)	0.4			(5.5		)	1.2
Equity securities	55.8			0			(96.2		)	0
Subtotal net holding period gains (losses)	53.5			0.4			(101.7		)	1.2
Other-than-temporary impairment losses
Equity securities:
Common equities	0			(2.6		)	0			(3.6		)
Subtotal investment other-than-temporary impairment losses	0			(2.6		)	0			(3.6		)
Other asset impairment	(11.1		)	(11.2		)	(11.1		)	(11.2		)
Subtotal other-than-temporary impairment losses	(11.1		)	(13.8		)	(11.1		)	(14.8		)
Total net realized gains (losses) on securities	$	32.8		$	32.1		$	(15.4	)	$	84.0

Gross realized gains were predominantly the result of sales in our indexed common stock portfolio in order to reduce the overall portfolio risk, while gross realized losses were predominantly in our available-for-sale securities and were the result of changes in credit spreads and interest rates. Also included are holding period change in valuation gains and losses on equity securities and hybrid securities, recoveries from litigation settlements related to investments, and write-downs for securities determined to be other-than-temporarily impaired. The other asset impairment relates to renewable energy investments, which are reflected in “other assets” on the balance sheet, under which the future pretax cash flows are expected to be less than the carrying value of the assets.

The following table reflects our holding period realized gains (losses) on equity securities recognized for the three and six months ended June 30, 2018 for equity securities held at quarter end:

	Three Months		Six Months
(millions)	2018		2018
Total net gains (losses) recognized during the period on equity securities	$	72.4	$	35.6
Less: Net gains (losses) recognized on equity securities sold during the period	16.6		131.8
Net holding period gains (losses) recognized during the period on equity securities held at period end	$	55.8	$	(96.2	)

Note: Comparative disclosure for the prior year period is not meaningful.

Net Investment Income  The components of net investment income for the three and six months ended June 30, were:

	Three Months						Six Months
(millions)	2018			2017			2018			2017
Available-for-sale securities:
Fixed maturities:
U.S. government obligations	$	45.9		$	17.0		$	85.7		$	29.7
State and local government obligations	9.1			13.1			19.1			26.4
Foreign government obligations	0			0.1			0			0.2
Corporate debt securities	51.8			31.3			88.0			60.9
Residential mortgage-backed securities	6.6			10.3			13.5			19.9
Commercial mortgage-backed securities	20.2			18.3			41.4			37.1
Other asset-backed securities	16.1			11.8			29.7			21.7
Redeemable preferred stocks	2.9			2.9			5.5			6.3
Total fixed maturities	152.6			104.8			282.9			202.2
Short-term investments	14.9			8.8			25.0			15.8
Total available-for-sale securities	167.5			113.6			307.9			218.0
Equity securities:
Nonredeemable preferred stocks	10.4			10.6			21.3			22.1
Common equities	14.2			14.6			29.2			27.9
Total equity securities	24.6			25.2			50.5			50.0
Investment income	192.1			138.8			358.4			268.0
Investment expenses	(6.2		)	(6.6		)	(12.2		)	(12.2		)
Net investment income	$	185.9		$	132.2		$	346.2		$	255.8

The amount of investment income (interest and dividends) we recognize varies from year to year based on the average assets held during the year and the book yields of the securities in our portfolio. The increase in net investment income on a year-over-year basis for the three and six months ended June 30, 2018, was due to a combination of an increase in average assets and an increase in portfolio yields. The increase in average assets was due to strong underwriting growth and profitability, as well as the $600 million debt and $500 million preferred stock issuances in the first quarter of 2018. The increase in portfolio yields was a result of our decision to increase the portfolio duration from 2.3 years at the end of the second quarter 2017 to 2.6 years at the end of the second quarter 2018 and a general rise in interest rates.

Trading Securities At June 30, 2018 and 2017, and December 31, 2017, we did not hold any trading securities and did not have any net realized gains (losses) on trading securities for the three and six months ended June 30, 2018 and 2017.

Derivative Instruments

At June 30, 2018 and 2017, and December 31, 2017, we had no open derivative positions. During March 2017, we entered into a forecasted debt issuance hedge, against a possible rise in interest rates, in conjunction with the $850 million of 4.125% Senior Notes due 2047 issued in April 2017. Upon issuance, we closed the hedge and recognized, as part of accumulated other comprehensive income, a pretax unrealized loss of $8.0 million in April 2017.

See Note 4 – Debt for further discussion.

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Fair Value

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value

Fair Value — We have categorized our financial instruments, based on the degree of subjectivity inherent in the method by which they are valued, into a fair value hierarchy of three levels, as follows:

• Level 1: Inputs are unadjusted quoted prices in active markets for identical instruments at the measurement date (e.g., U.S. government obligations, which are continually priced on a daily basis, active exchange-traded equity securities, and certain short-term securities).

• Level 2: Inputs (other than quoted prices included within Level 1) that are observable for the instrument either directly or indirectly (e.g., certain corporate and municipal bonds and certain preferred stocks). This includes: (i) quoted prices for similar instruments in active markets, (ii) quoted prices for identical or similar instruments in markets that are not active, (iii) inputs other than quoted prices that are observable for the instruments, and (iv) inputs that are derived principally from or corroborated by observable market data by correlation or other means.

• Level 3: Inputs that are unobservable. Unobservable inputs reflect our subjective evaluation about the assumptions market participants would use in pricing the financial instrument (e.g., certain structured securities and privately held investments).

Determining the fair value of the investment portfolio is the responsibility of management. As part of the responsibility, we evaluate whether a market is distressed or inactive in determining the fair value for our portfolio. We review certain market level inputs to evaluate whether sufficient activity, volume, and new issuances exist to create an active market. Based on this evaluation, we concluded that there was sufficient activity related to the sectors and securities for which we obtained valuations.

The composition of the investment portfolio by major security type and our outstanding debt was:

	Fair Value
(millions)	Level 1		Level 2		Level 3		Total		Cost
June 30, 2018
Fixed maturities:
U.S. government obligations	$	7,865.4	$	0	$	0	$	7,865.4	$	8,005.8
State and local government obligations	0		1,667.3		0		1,667.3		1,678.9
Foreign government obligations	0		0		0		0		0
Corporate debt securities	0		7,330.3		0		7,330.3		7,422.4
Subtotal	7,865.4		8,997.6		0		16,863.0		17,107.1
Asset-backed securities:
Residential mortgage-backed	0		822.6		0		822.6		819.6
Commercial mortgage-backed	0		2,696.9		0		2,696.9		2,725.5
Other asset-backed	0		3,177.6		0		3,177.6		3,189.2
Subtotal asset-backed securities	0		6,697.1		0		6,697.1		6,734.3
Redeemable preferred stocks:
Financials	0		67.7		0		67.7		65.3
Utilities	0		4.6		0		4.6		4.8
Industrials	10.1		146.7		0		156.8		150.3
Subtotal redeemable preferred stocks	10.1		219.0		0		229.1		220.4
Total fixed maturities	7,875.5		15,913.7		0		23,789.2		24,061.8
Short-term investments	2,954.2		277.0		0		3,231.2		3,231.2
Total available-for-sale securities	10,829.7		16,190.7		0		27,020.4		27,293.0
Equity securities:
Nonredeemable preferred stocks:
Financials	77.4		676.2		0		753.6		672.0
Industrials	0		0		5.0		5.0		5.0
Subtotal nonredeemable preferred stocks	77.4		676.2		5.0		758.6		677.0
Common equities:
Common stocks	3,141.9		0		0		3,141.9		1,313.7
Other risk investments	0		0		0.3		0.3		0.3
Subtotal common equities	3,141.9		0		0.3		3,142.2		1,314.0
Total equity securities	3,219.3		676.2		5.3		3,900.8		1,991.0
Total portfolio	$	14,049.0	$	16,866.9	$	5.3	$	30,921.2	$	29,284.0
Debt	$	0	$	3,959.0	$	0	$	3,959.0	$	3,859.5

	Fair Value
(millions)	Level 1		Level 2		Level 3		Total		Cost
June 30, 2017
Fixed maturities:
U.S. government obligations	$	4,155.0	$	0	$	0	$	4,155.0	$	4,166.4
State and local government obligations	0		2,500.1		0		2,500.1		2,473.3
Foreign government obligations	22.5		0		0		22.5		22.5
Corporate debt securities	0		5,013.8		0		5,013.8		4,991.6
Subtotal	4,177.5		7,513.9		0		11,691.4		11,653.8
Asset-backed securities:
Residential mortgage-backed	0		1,267.6		0		1,267.6		1,260.3
Commercial mortgage-backed	0		2,375.0		0		2,375.0		2,364.9
Other asset-backed	0		2,847.4		0		2,847.4		2,843.3
Subtotal asset-backed securities	0		6,490.0		0		6,490.0		6,468.5
Redeemable preferred stocks:
Financials	0		64.1		0		64.1		60.4
Utilities	0		32.2		0		32.2		30.5
Industrials	0		110.4		0		110.4		98.5
Subtotal redeemable preferred stocks	0		206.7		0		206.7		189.4
Total fixed maturities	4,177.5		14,210.6		0		18,388.1		18,311.7
Equity securities:
Nonredeemable preferred stocks:
Financials	85.3		697.8		0		783.1		666.0
Industrials	0		0		0		0		0
Subtotal nonredeemable preferred stocks	85.3		697.8		0		783.1		666.0
Common equities:
Common stocks	3,077.2		0		0		3,077.2		1,472.0
Other risk investments	0		0		0.3		0.3		0.3
Subtotal common equities	3,077.2		0		0.3		3,077.5		1,472.3
Total fixed maturities and equity securities	7,340.0		14,908.4		0.3		22,248.7		20,450.0
Short-term investments	2,448.0		1,281.7		0		3,729.7		3,729.7
Total portfolio	$	9,788.0	$	16,190.1	$	0.3	$	25,978.4	$	24,179.7
Debt	$	0	$	3,564.4	$	114.8	$	3,679.2	$	3,383.4

	Fair Value
(millions)	Level 1		Level 2		Level 3		Total		Cost
December 31, 2017
Fixed maturities:
U.S. government obligations	$	6,645.9	$	0	$	0	$	6,645.9	$	6,688.8
State and local government obligations	0		2,297.1		0		2,297.1		2,285.6
Foreign government obligations	0		0		0		0		0
Corporate debt securities	0		4,997.7		0		4,997.7		4,997.2
Subtotal	6,645.9		7,294.8		0		13,940.7		13,971.6
Asset-backed securities:
Residential mortgage-backed	0		836.7		0		836.7		828.8
Commercial mortgage-backed	0		2,758.6		0		2,758.6		2,760.1
Other asset-backed	0		2,454.7		0		2,454.7		2,454.5
Subtotal asset-backed securities	0		6,050.0		0		6,050.0		6,043.4
Redeemable preferred stocks:
Financials	0		64.1		0		64.1		61.3
Utilities	0		11.4		0		11.4		10.1
Industrials	0		135.5		0		135.5		123.5
Subtotal redeemable preferred stocks	0		211.0		0		211.0		194.9
Total fixed maturities	6,645.9		13,555.8		0		20,201.7		20,209.9
Equity securities:
Nonredeemable preferred stocks:
Financials	80.6		718.2		0		798.8		693.6
Industrials	0		0		5.0		5.0		5.0
Subtotal nonredeemable preferred stocks	80.6		718.2		5.0		803.8		698.6
Common equities:
Common stocks	3,399.5		0		0		3,399.5		1,498.7
Other risk investments	0		0		0.3		0.3		0.3
Subtotal common equities	3,399.5		0		0.3		3,399.8		1,499.0
Total fixed maturities and equity securities	10,126.0		14,274.0		5.3		24,405.3		22,407.5
Short-term investments	1,824.4		1,045.0		0		2,869.4		2,869.4
Total portfolio	$	11,950.4	$	15,319.0	$	5.3	$	27,274.7	$	25,276.9
Debt	$	0	$	3,606.5	$	37.1	$	3,643.6	$	3,306.3

Our portfolio valuations, excluding short-term investments, classified as either Level 1 or Level 2 in the above tables are priced exclusively by external sources, including: pricing vendors, dealers/market makers, and exchange-quoted prices. We did not have any transfers between Level 1 and Level 2 during 2018 or 2017.

Our short-term security holdings classified as Level 1 are highly liquid, actively marketed, and have a very short duration, primarily 90 days or less to redemption. These securities are held at their original cost, adjusted for any accretion of discount, since that value very closely approximates what an active market participant would be willing to pay for such securities. The remainder of our short-term securities are classified as Level 2 and are not priced externally since these securities continually trade at par value. These securities are classified as Level 2 since they are primarily longer-dated securities issued by municipalities that contain either liquidity facilities or mandatory put features within one year.

At June 30, 2018, vendor-quoted prices represented 72% of our Level 1 classifications (excluding short-term investments), compared to 58% and 66% at June 30, 2017 and December 31, 2017, respectively. The securities quoted by vendors in Level 1 primarily represent our holdings in U.S. Treasury Notes, which are frequently traded, and the quotes are considered similar to exchange-traded quotes. The balance of our Level 1 pricing comes from quotes obtained directly from trades made on active exchanges.

At June 30, 2018 and 2017, and December 31, 2017, vendor-quoted prices comprised 98%, 99%, and 98%, respectively, of our Level 2 classifications (excluding short-term investments), while dealer-quoted prices represented 2%, 1%, and 2%, respectively. In our process for selecting a source (e.g., dealer, pricing service) to provide pricing for securities in our portfolio, we reviewed documentation from the sources that detailed the pricing techniques and methodologies used by these sources and determined if their policies adequately considered market activity, either based on specific transactions for the particular security type or based on modeling of securities with similar credit quality, duration, yield, and structure that were recently transacted. Once a source is chosen, we continue to monitor any changes or modifications to their processes by reviewing their documentation on internal controls for pricing and market reviews. We review quality control measures of our sources as they become available to determine if any significant changes have occurred from period to period that might indicate issues or concerns regarding their evaluation or market coverage.

As part of our pricing procedures, we obtain quotes from more than one source to help us fully evaluate the market price of securities. However, our internal pricing policy is to use a consistent source for individual securities in order to maintain the integrity of our valuation process. Quotes obtained from the sources are not considered binding offers to transact. Under our policy, when a review of the valuation received from our selected source appears to be outside of what is considered market level activity (which is defined as trading at spreads or yields significantly different than those of comparable securities or outside the general sector level movement without a reasonable explanation), we may use an alternate source’s price. To the extent we determine that it may be prudent to substitute one source’s price for another, we will contact the initial source to obtain an understanding of the factors that may be contributing to the significant price variance, which often leads the source to adjust their pricing input data for future pricing.

To allow us to determine if our initial source is providing a price that is outside of a reasonable range, we review our portfolio pricing on a weekly basis. When necessary, we challenge prices from our sources when a price provided does not match our expectations based on our evaluation of market trends and activity. Initially, we perform a review of our portfolio by sector to identify securities whose prices appear outside of a reasonable range. We then perform a more detailed review of fair values for securities disclosed as Level 2. We review dealer bids and quotes for these and/or similar securities to determine the market level context for our valuations. We then evaluate inputs relevant for each class of securities disclosed in the preceding hierarchy tables.

For our structured debt securities, including commercial, residential, and asset-backed securities, we evaluate available market-related data for these and similar securities related to collateral, delinquencies, and defaults for historical trends and reasonably estimable projections, as well as historical prepayment rates and current prepayment assumptions and cash flow estimates. We further stratify each class of our structured debt securities into more finite sectors (e.g., planned amortization class, first pay, second pay, senior, subordinated, etc.) and use duration, credit quality, and coupon to determine if the fair value is appropriate.

For our corporate debt and preferred stock (redeemable and nonredeemable) portfolios, as well as the notes and debentures issued by The Progressive Corporation (see Note 4 – Debt), we review securities by duration, coupon, and credit quality, as well as changes in interest rate and credit spread movements within that stratification. The review also includes recent trades, including: volume traded at various levels that establish a market, issuer specific fundamentals, and industry specific economic news as it comes to light.

For our municipal securities (e.g., general obligations, revenue, and housing), we stratify the portfolio to evaluate securities by type, coupon, credit quality, and duration to review price changes relative to credit spread and interest rate changes. Additionally, we look to economic data as it relates to geographic location as an indication of price-to-call or maturity predictors. For municipal housing securities, we look to changes in cash flow projections, both historical and reasonably estimable projections, to understand yield changes and their effect on valuation.

Lastly, for our short-term securities, we look at acquisition price relative to the coupon or yield. Since our short-term securities are typically 90 days or less to maturity, with the majority listed in Level 2 being 30 days or less to redemption, we believe that acquisition price is the best estimate of fair value.

We also review data assumptions as supplied by our sources to determine if that data is relevant to current market conditions. In addition, we independently review each sector for transaction volumes, new issuances, and changes in spreads, as well as the overall movement of interest rates along the yield curve to determine if sufficient activity and liquidity exists to provide a credible source for our market valuations.

During each valuation period, we create internal estimations of portfolio valuation (performance returns), based on current market-related activity (i.e., interest rate and credit spread movements and other credit-related factors) within each major sector of our portfolio. We compare our internally generated portfolio results with those generated based on quotes we receive externally and research material valuation differences. We compare our results to index returns for each major sector adjusting for duration and credit quality differences to better understand our portfolio’s results. Additionally, we review on a monthly basis our external sales transactions and compare the actual final market sales prices to previous market valuation prices. This review provides us further validation that our pricing sources are providing market level prices, since we are able to explain significant price changes (i.e., greater than 2%) as known events occur in the marketplace and affect a particular security’s price at sale.

This analysis provides us with additional comfort regarding the source’s process, the quality of its review, and its willingness to improve its analysis based on feedback from clients. We believe this effort helps ensure that we are reporting the most representative fair values for our securities.

Except as described below, our Level 3 securities are also priced externally; however, due to several factors (e.g., nature of the securities, level of activity, and lack of similar securities trading to obtain observable market level inputs), these valuations are more subjective in nature. Certain private equity investments and fixed-income investments included in the Level 3 category are valued using external pricing supplemented by internal review and analysis.

After all the valuations are received and our review is complete, if the inputs used by vendors are determined to not contain sufficient observable market information, we will reclassify the affected security valuations to Level 3. At June 30, 2018 and 2017, and December 31, 2017, we did not have any securities in our fixed-maturity portfolio listed as Level 3.

At June 30, 2018 and December 31, 2017, we held one private nonredeemable preferred security with a value of $5.0 million that was priced internally. The security was purchased during the third quarter 2017 and the value at both periods equals the cost at acquisition. A review of their latest available financial statements did not reveal any significant changes that would impact the security’s fair value. We did not hold any internally priced securities at June 30, 2017.

We review the prices from our external sources for reasonableness using internally developed assumptions to derive prices for the securities, which are then compared to the prices we received. During 2018 or 2017, there were no material assets or liabilities measured at fair value on a nonrecurring basis. Based on our review, all prices received from external sources remained unadjusted.

We did not have any material changes in fair value associated with Level 3 assets for the three and six months ended June 30, 2018 and 2017. Due to the relative size of the Level 3 securities’ fair values compared to the total portfolio’s fair value, any changes in pricing methodology would not have a significant change in valuation that would materially impact net or comprehensive income.

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Debt

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Debt

Debt — Debt at each of the balance sheet periods consisted of:

	June 30, 2018				June 30, 2017				December 31, 2017
(millions)	Carrying Value		Fair Value		Carrying Value		Fair Value		Carrying Value		Fair Value
3.75% Senior Notes due 2021	$	498.9	$	506.4	$	498.6	$	528.0	$	498.8	$	520.7
2.45% Senior Notes due 2027	496.3		451.3		496.0		474.2		496.1		477.9
6 5/8% Senior Notes due 2029	296.2		364.4		296.0		389.0		296.1		382.3
6.25% Senior Notes due 2032	395.4		492.5		395.2		522.7		395.3		516.9
4.35% Senior Notes due 2044	346.6		356.7		346.5		376.5		346.5		388.7
3.70% Senior Notes due 2045	395.3		363.9		395.2		389.7		395.2		402.9
4.125% Senior Notes due 2047	841.3		831.5		841.1		884.3		841.2		917.1
4.20% Senior Notes due 2048	589.5		592.3		0		0		0		0
Other debt instruments	0		0		114.8		114.8		37.1		37.1
Total	$	3,859.5	$	3,959.0	$	3,383.4	$	3,679.2	$	3,306.3	$	3,643.6

During the first quarter 2018, ARX repaid its term loans, in their entirety, in the aggregate principal amount of $37.1 million and, during the third quarter 2017, redeemed its junior subordinated notes and senior notes, in their entirety, in the aggregate principal amount of $65.2 million. Both the repayment and the redemptions were funded in part with proceeds from fixed-rate loans made by The Progressive Corporation. These intercompany transactions were eliminated in consolidation.

The Progressive Corporation Debt

The Progressive Corporation issued $600 million of 4.20% Senior Notes due 2048 (the “4.20% Senior Notes”) in March 2018, and $850 million of 4.125% Senior Notes due 2047 (the “4.125% Senior Notes”) in April 2017, in underwritten public offerings. The net proceeds from these issuances, after deducting underwriters’ discounts, commissions, and other issuance costs, were approximately $589.5 million and $841.1 million, respectively. In addition, upon issuance of the 4.125% Senior Notes, we closed a forecasted debt issuance hedge, which was entered into to hedge against a possible rise in interest rates, and recognized an $8.0 million pretax unrealized loss as part of accumulated other comprehensive income (loss), which is being amortized as an adjustment to interest expense over the life of the 4.125% Senior Notes. Consistent with the other senior notes issued by Progressive, interest on the 4.20% Senior Notes and 4.125% Senior Notes is payable semiannually and both are redeemable, in whole or in part, at any time.

The Progressive Corporation Line of Credit

During the second quarter 2018, The Progressive Corporation entered into a new line of credit with PNC Bank, National Association (PNC) in the maximum principal amount of $250 million. The prior line of credit, entered into in April 2017, had expired. The line of credit is on the same terms and conditions as the previous line of credit. Subject to the terms and conditions of the line of credit documents, advances under the line of credit (if any) will bear interest at a variable rate equal to the higher of PNC’s Prime Rate or the sum of the Federal Funds Open Rate plus 50 basis points. Each advance must be repaid on the 30th day after the advance or, if earlier, on April 30, 2019, the expiration date of the line of credit. Prepayments are permitted without penalty. The line of credit is uncommitted and, as such, all advances are subject to PNC’s discretion. We had no borrowings under either line of credit during the first six months of 2018 or throughout 2017.

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Income Taxes

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes — Deferred tax assets and liabilities are recorded based on the difference between the financial statement and tax bases of assets and liabilities at the enacted tax rates. We review our deferred tax assets regularly for recoverability. At June 30, 2018 and 2017, and December 31, 2017, we determined that we did not need a valuation allowance on our gross deferred tax assets. Although realization of the deferred tax assets is not assured, management believes that it is more likely than not the deferred tax assets will be realized based on our expectation that we will be able to fully utilize the deductions that are ultimately recognized for tax purposes.

For deferred taxes on items that are reported in accumulated other comprehensive income, our policy is to release the income tax effects related to these items on an aggregate portfolio approach. For this purpose, we consider our available-for-sale fixed maturity securities and hedges on forecasted transactions as separate portfolios.

For the six months endedJune 30, 2018, there have been no material changes in our uncertain tax positions.

The effective tax rate for the three and six months ended June 30, 2018 were 20.3% and 20.1% respectively, compared to 32.8% and 32.9% for the same periods in 2017. The current year effective tax rate is lower primarily due to the reduction in the U.S. corporate income tax rate from 35% to 21%, effective January 1, 2018.

As of June 30, 2018, we have not fully completed our accounting for the tax effects of the enactment of the legislation commonly known as the Tax Cuts and Jobs Act of 2017 with regard to the deductibility of compensation expense for certain covered executives due to uncertainty surrounding the appropriate tax treatment of outstanding performance-based awards, and uncertainty surrounding the discount factors to be applied for loss reserve discounting. We are waiting for the Internal Revenue Service to publish additional guidance or information for both items.

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Loss and Loss Adjustment Expense Reserves

6 Months Ended

Jun. 30, 2018

Loss and Loss Adjustment Expenses Reserves [Abstract]

Loss and Loss Adjustment Expenses Reserves

Loss and Loss Adjustment Expense Reserves — Activity in the loss and loss adjustment expense reserves is summarized as follows:

	June 30,
(millions)	2018		2017
Balance, Beginning of period	$	13,086.9	$	11,368.0
Less reinsurance recoverables on unpaid losses	2,170.1		1,801.0
Net balance, Beginning of period	10,916.8		9,567.0
Incurred related to:
Current year	10,164.6		8,804.1
Prior years	81.5		74.2
Total incurred	10,246.1		8,878.3
Paid related to:
Current year	5,533.7		4,951.0
Prior years	3,851.5		3,381.8
Total paid	9,385.2		8,332.8
Net balance, End of period	11,777.7		10,112.5
Plus reinsurance recoverables on unpaid losses	2,293.1		1,947.9
Balance, End of period	$	14,070.8	$	12,060.4

We experienced unfavorable reserve development of $81.5 million and $74.2 million for the first six months of 2018 and 2017, respectively, which is reflected as “Incurred related to prior years” in the table above.

Year-to-date June 30, 2018

• Approximately $72 million of the unfavorable prior year reserve development was attributable to accident years 2017 and 2016.

• Our personal auto business incurred about $57 million of unfavorable loss and loss adjustment expense (LAE) reserve development, with the Agency and Direct auto businesses contributing about $36 million and $21 million, respectively, of unfavorable development. The unfavorable development was primarily due to an increase in reopened personal injury protection (PIP) claims.

• Our Commercial Lines business experienced about $17 million of unfavorable development primarily due to late reported losses and higher LAE than anticipated.

• Our Property business recognized unfavorable development of about $7 million, while our special lines products had minimal development during the first half of the year.

Year-to-date June 30, 2017

• Approximately $56 million of the unfavorable prior year reserve development was attributable to accident year 2016 with the balance attributable to accident year 2015.

• Our commercial and personal auto businesses incurred about $102 million of unfavorable loss and LAE reserve development for the first six months of 2017, partially offset by the favorable loss and LAE reserve development of about $28 million in our special lines and Property businesses.

• Our Agency and Direct personal auto businesses incurred about $65 million and $29 million, respectively, of the total unfavorable reserve development, primarily due to an increase in costs related to property damage, more late reported bodily injury claims than anticipated, and higher LAE costs.

• Our Property business experienced about $20 million in favorable development primarily due to the identification of prior year losses eligible to be ceded under our catastrophe bond reinsurance program.

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Supplemental Cash Flow Information

6 Months Ended

Jun. 30, 2018

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

Supplemental Cash Flow Information — Cash and cash equivalents include bank demand deposits and daily overnight reverse repurchase commitments of funds held in bank demand deposit accounts on ARX’s subsidiaries, which are primarily collateralized by U.S. Treasury notes. The amount of reverse repurchase commitments held by ARX’s subsidiaries at June 30, 2018 and 2017, and December 31, 2017, were $155.9 million, $130.2 million, and $247.2 million, respectively.

Restricted cash on our consolidated balance sheets represents cash that is restricted to pay flood claims under the National Flood Insurance Program’s “Write Your Own” program, for which American Strategic Insurance and other subsidiaries of ARX (ASI) are administrators.

We paid the following in the respective periods:

	Six Months Ended June 30,
(millions)	2018		2017
Income taxes	$	358.9	$	452.9
Interest	70.9		73.3

Income taxes paid for the six months ended June 30, 2017, was revised to correct the amount of tax payments disclosed for that period; there was no overall impact on the decrease in cash, cash equivalents, and restricted cash that was reported in our consolidated statement of cash flows for the six months ended June 30, 2017.

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Segment Information

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Segment Information

Segment Information — Our Personal Lines segment writes insurance for personal autos and recreational vehicles (our special lines products). Our Commercial Lines segment writes primary liability and physical damage insurance for automobiles and trucks owned and/or operated predominantly by small businesses in the business auto, for-hire transportation, contractor, for-hire specialty, tow, and for-hire livery markets. Our Property segment writes residential property insurance for homeowners, other property owners, and renters. Our other indemnity businesses include our run-off businesses. Our service businesses provide insurance-related services, including processing Commercial Automobile Insurance Procedures/Plans (CAIP) business and serving as an agent for homeowners, general liability, and workers’ compensation insurance, among other products, through our programs with ASI and unaffiliated insurance companies. All segment revenues are generated from external customers; all intercompany transactions, including those between Progressive and ASI, are eliminated in consolidation.

Following are the operating results for the respective periods:

	Three Months Ended June 30,										Six Months Ended June 30,
	2018					2017					2018					2017
(millions)	Revenues		Pretax Profit (Loss)			Revenues		Pretax Profit (Loss)			Revenues		Pretax Profit (Loss)			Revenues		Pretax Profit (Loss)
Personal Lines
Agency	$	3,225.7	$	360.9		$	2,752.5	$	205.5		$	6,289.5	$	770.0		$	5,384.0	$	455.2
Direct	3,211.8		287.9			2,650.0		162.7			6,228.1		585.9			5,173.7		338.0
Total Personal Lines1	6,437.5		648.8			5,402.5		368.2			12,517.6		1,355.9			10,557.7		793.2
Commercial Lines	884.3		100.3			671.7		56.2			1,692.9		195.1			1,317.2		123.6
Property2	312.4		(51.9		)	239.1		3.7			597.7		(23.4		)	465.1		11.5
Other indemnity	0		0			0		(0.1		)	0		0.2			0		(0.3		)
Total underwriting operations	7,634.2		697.2			6,313.3		428.0			14,808.2		1,527.8			12,340.0		928.0
Fees and other revenues3	116.0		NA			88.8		NA			219.8		NA			174.0		NA
Service businesses	42.9		5.9			32.7		5.7			77.1		10.8			61.2		8.3
Investments4	224.9		218.7			170.9		164.3			343.0		330.8			352.0		339.8
Other gains (losses)	0		0			0		0			0		0			0.2		0.2
Interest expense	NA		(41.7		)	NA		(43.4		)	NA		(78.5		)	NA		(80.2		)
Consolidated total	$	8,018.0	$	880.1		$	6,605.7	$	554.6		$	15,448.1	$	1,790.9		$	12,927.4	$	1,196.1

NA = Not applicable

¹ Personal auto insurance accounted for 94% of the total Personal Lines segment net premiums earned during the three and six months ended June 30, 2018, and 93% for the same periods in 2017; insurance for our special lines products (e.g., motorcycles, ATVs, RVs, watercraft, and snowmobiles) accounted for the balance of the Personal Lines net premiums earned.

² For the three and six months ended June 30, 2018, pretax profit (loss) includes $18.0 million and $36.0 million, respectively, of amortization expense predominately associated with the acquisition of a controlling interest in ARX and $15.5 million and $31.0 million for the same periods in 2017. Although this expense is included in our Property segment, it is not reported in the consolidated results of ARX and, therefore, will not affect the value of net income (loss) attributable to noncontrolling interest.

³ Pretax profit (loss) for fees and other revenues is attributable to operating segments.

⁴ Revenues represent recurring investment income and total net realized gains (losses) on securities; pretax profit is net of investment expense.

Our management uses underwriting margin and combined ratio as primary measures of underwriting profitability. Underwriting profitability is calculated by subtracting losses and loss adjustment expenses, policy acquisition costs, and other underwriting expenses from the total of net premiums earned and fees and other revenues. The underwriting margin is the pretax underwriting profit (loss) expressed as a percentage of net premiums earned (i.e., revenues from underwriting operations). Combined ratio is the complement of the underwriting margin. Following are the underwriting margins/combined ratios for our underwriting operations for the respective periods:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	Under-writing Margin		Combined Ratio	Under-writing Margin		Combined Ratio	Under-writing Margin		Combined Ratio	Under-writing Margin		Combined Ratio
Personal Lines
Agency	11.2	%	88.8	7.5	%	92.5	12.2	%	87.8	8.5	%	91.5
Direct	9.0		91.0	6.1		93.9	9.4		90.6	6.5		93.5
Total Personal Lines	10.1		89.9	6.8		93.2	10.8		89.2	7.5		92.5
Commercial Lines	11.3		88.7	8.4		91.6	11.5		88.5	9.4		90.6
Property1	(16.6	)	116.6	1.5		98.5	(3.9	)	103.9	2.5		97.5
Total underwriting operations	9.1		90.9	6.8		93.2	10.3		89.7	7.5		92.5

¹ Included in the three and six months ended June 30, 2018 is 5.8 points and 6.0 points, respectively, of amortization expense predominately associated with the acquisition of a controlling interest in ARX and 6.5 points and 6.7 points, respectively, for the three and six months ended June 30, 2017.

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Dividends

6 Months Ended

Jun. 30, 2018

Text Block [Abstract]

Dividends

Dividends

Annual Variable Common Share Dividends

We maintain a policy of paying an annual variable dividend on our common shares that, if declared, would be payable shortly after the close of the year. This annual variable dividend is based on a target percentage of after-tax underwriting income (using the statutory tax rate) multiplied by a performance factor (Gainshare factor), which is determined by reference to the Agency auto, Direct auto, special lines, Commercial Lines, and Property business units, with minor exclusions and adjustments, and subject to the limitations discussed below. The target percentage is determined by our Board of Directors on an annual basis and announced to shareholders and the public. In December 2017, the Board determined the target percentage for 2018 to be 33-1/3% of annual after-tax underwriting income, which is unchanged from the 2017 target percentage.

The Gainshare factor can range from zero to two and is determined by comparing our operating performance for the specified business units for the year to certain predetermined profitability and growth objectives approved by the Compensation Committee of the Board. This Gainshare factor is also used in the annual cash incentive program currently in place for our employees (our “Gainsharing program”). On a year-to-date basis, as of June 30, 2018, the Gainshare factor was 1.91. Since the final factor will be determined based on our results for the full year, the final factor may vary from the current factor.

Our annual dividend program will result in a variable payment to shareholders each year, subject to certain limitations. If the Gainshare factor is zero or if our comprehensive income is less than after-tax underwriting income, no dividend would be payable under our annual variable dividend policy. In addition, the ultimate decision on whether or not a dividend will be paid is in the discretion of the Board of Directors. The Board could decide to alter our policy, or not to pay the annual variable dividend, at any time prior to the declaration of the dividend for the year. Such an action by the Board could result from, among other reasons, changes in the insurance marketplace, changes in our performance or capital needs, changes in the U.S. federal income tax laws, disruptions of national or international capital markets, or other events affecting our business, liquidity, or financial position.

Following is a summary of our shareholder dividends that were declared in the last two years:

(millions, except per share amounts)			Amount of Common Share Dividends
Dividend Type	Declared	Paid	Per Share		Accrued1		Paid1
Annual – Variable	December 2017	February 2018	$	1.1247	$	655.1	$	654.9
Annual – Variable	December 2016	February 2017	0.6808		395.4		395.4

¹ Variance between accrued and paid, if any, reflects the difference between the number of estimated and actual shares outstanding as of the record date.

Preferred Share Dividends

In the first quarter 2018, we issued 500,000 Series B Fixed-to-Floating Rate Cumulative Perpetual Serial Preferred Shares, without par value (the “Series B Preferred Shares”), with a liquidation preference of $1,000 per share (the “stated amount”). Holders of the Series B Preferred Shares will be entitled to receive cumulative cash dividends semi-annually in March and September, if and when declared by the Board of Directors. Until March 15, 2023 (the “fixed-rate period”), the annual dividend rate is fixed at 5.375% of the stated amount per share. Beginning March 15, 2023, the annual dividend rate switches to a floating rate equal to the three-month LIBOR rate plus a spread of 2.539% applied to the stated amount per share. After the fixed-rate period and up until redemption of the Series B Preferred Shares, the dividends would be payable quarterly, if and when declared by the Board of Directors. The Series B Preferred Shares are perpetual and have no stated maturity date. After the fixed-rate period, we may redeem the Series B Preferred Shares at the stated amount plus all accrued and unpaid dividends.

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Other Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Other Comprehensive Income (Loss)

Other Comprehensive Income (Loss) — The components of other comprehensive income (loss), including reclassification adjustments by income statement line item, were as follows:

										Components of Changes in Accumulated Other Comprehensive Income (after tax)
(millions)	Pretax total accumulated other comprehensive income			Total tax (provision) benefit			After tax total accumulated other comprehensive income			Total net unrealized gains  (losses) on securities			Net unrealized gains on forecasted transactions			Foreign currency translation adjustment		(Income)loss attributable to NCI
Balance at March 31, 2018	$	(218.6	)	$	46.0		$	(172.6	)	$	(160.8	)	$	(17.8	)	$	0	$	6.0
Other comprehensive income (loss) before reclassifications:
Investment securities	(90.4		)	18.8			(71.6		)	(71.6		)	0			0		0
Forecasted transactions	0			0			0			0			0			0		0
Foreign currency translation adjustment	0			0			0			0			0			0		0
Loss attributable to noncontrolling interest (NCI)	0.7			(0.1		)	0.6			0			0			0		0.6
Total other comprehensive income (loss) before reclassifications	(89.7		)	18.7			(71.0		)	(71.6		)	0			0		0.6
Less: Reclassification adjustment for amounts realized in net income by income statement line item:
Net impairment losses recognized in earnings	0			0			0			0			0			0		0
Net realized gains (losses) on securities	(27.2		)	5.7			(21.5		)	(21.5		)	0			0		0
Interest expense	(0.3		)	0.1			(0.2		)	0			(0.2		)	0		0
Total reclassification adjustment for amounts realized in net income	(27.5		)	5.8			(21.7		)	(21.5		)	(0.2		)	0		0
Total other comprehensive income (loss)	(62.2		)	12.9			(49.3		)	(50.1		)	0.2			0		0.6
Balance at June 30, 2018	$	(280.8	)	$	58.9		$	(221.9	)	$	(210.9	)	$	(17.6	)	$	0	$	6.6

										Components of Changes in Accumulated Other Comprehensive Income (after tax)
(millions)	Pretax total accumulated other comprehensive income			Total tax (provision) benefit			After tax total accumulated other comprehensive income			Total net unrealized gains  (losses) on securities			Net unrealized gains on forecasted transactions			Foreign currency translation adjustment		(Income)loss attributable to NCI
Balance at December 31, 2017	$	1,977.8		$	(695.6	)	$	1,282.2		$	1,295.0		$	(14.8	)	$	0	$	2.0
Cumulative effect adjustment1	(2,006.0		)	705.8			(1,300.2		)	(1,300.2		)	0			0		0
Reclassification of disproportionate tax effect2	0			(4.3		)	(4.3		)	(1.1		)	(3.2		)	0		0
Adjusted balance at December 31, 2017	(28.2		)	5.9			(22.3		)	(6.3		)	(18.0		)	0		2.0
Other comprehensive income (loss) before reclassifications:
Investment securities	(293.8		)	61.6			(232.2		)	(232.2		)	0			0		0
Forecasted transactions	0			0			0			0			0			0		0
Foreign currency translation adjustment	0			0			0			0			0			0		0
Loss attributable to noncontrolling interest (NCI)	5.8			(1.2		)	4.6			0			0			0		4.6
Total other comprehensive income (loss) before reclassifications	(288.0		)	60.4			(227.6		)	(232.2		)	0			0		4.6
Less: Reclassification adjustment for amounts realized in net income by income statement line item:
Net impairment losses recognized in earnings	0			0			0			0			0			0		0
Net realized gains (losses) on securities	(34.9		)	7.3			(27.6		)	(27.6		)	0			0		0
Interest expense	(0.5		)	0.1			(0.4		)	0			(0.4		)	0		0
Total reclassification adjustment for amounts realized in net income	(35.4		)	7.4			(28.0		)	(27.6		)	(0.4		)	0		0
Total other comprehensive income (loss)	(252.6		)	53.0			(199.6		)	(204.6		)	0.4			0		4.6
Balance at June 30, 2018	$	(280.8	)	$	58.9		$	(221.9	)	$	(210.9	)	$	(17.6	)	$	0	$	6.6

¹Reflects the fair value changes on equity securities as of December 31, 2017, which are reported as realized gains (losses) under the new accounting guidance. See Note 14 – New Accounting Standards for additional information.

²Reflects the effect of the change in the U.S. federal tax rate on our available-for-sale fixed maturity securities and our hedges on forecasted transactions as of December 31, 2017. See Note 14 – New Accounting Standards for additional information.

										Components of Changes in Accumulated Other Comprehensive Income (after tax)
(millions)	Pretax total accumulated other comprehensive income			Total tax (provision) benefit			After tax total accumulated other comprehensive income			Total net unrealized gains  (losses) on securities			Net unrealized gains on forecasted transactions			Foreign currency translation adjustment			(Income)loss attributable to NCI
Balance at March 31, 2017	$	1,645.9		$	(578.4	)	$	1,067.5		$	1,072.0		$	(7.1	)	$	(0.8	)	$	3.4
Other comprehensive income (loss) before reclassifications:
Investment securities	177.2			(62.1		)	115.1			115.1			0			0			0
Forecasted transactions	(12.0		)	4.2			(7.8		)	0			(7.8		)	0			0
Foreign currency translation adjustment	(0.2		)	0.1			(0.1		)	0			0			(0.1		)	0
Loss attributable to noncontrolling interest (NCI)	(1.9		)	0.6			(1.3		)	0			0			0			(1.3		)
Total other comprehensive income (loss) before reclassifications	163.1			(57.2		)	105.9			115.1			(7.8		)	(0.1		)	(1.3		)
Less: Reclassification adjustment for amounts realized in net income by income statement line item:
Net impairment losses recognized in earnings	(2.6		)	0.9			(1.7		)	(1.7		)	0			0			0
Net realized gains (losses) on securities	37.2			(13.0		)	24.2			24.2			0			0			0
Interest expense	0.3			(0.1		)	0.2			0			0.2			0			0
Total reclassification adjustment for amounts realized in net income	34.9			(12.2		)	22.7			22.5			0.2			0			0
Total other comprehensive income (loss)	128.2			(45.0		)	83.2			92.6			(8.0		)	(0.1		)	(1.3		)
Balance at June 30, 2017	$	1,774.1		$	(623.4	)	$	1,150.7		$	1,164.6		$	(15.1	)	$	(0.9	)	$	2.1

										Components of Changes in Accumulated Other Comprehensive Income (after tax)
(millions)	Pretax total accumulated other comprehensive income			Total tax (provision) benefit			After tax total accumulated other comprehensive income			Total net unrealized gains  (losses) on securities			Net unrealized gains on forecasted transactions			Foreign currency translation adjustment			(Income)loss attributable to NCI
Balance at December 31, 2016	$	1,439.5		$	(506.1	)	$	933.4		$	939.6		$	(9.4	)	$	(1.1	)	$	4.3
Other comprehensive income (loss) before reclassifications:
Investment securities	431.7			(151.3		)	280.4			280.4			0			0			0
Forecasted transactions	(8.0		)	2.8			(5.2		)	0			(5.2		)	0			0
Foreign currency translation adjustment	0.3			(0.1		)	0.2			0			0			0.2			0
Loss attributable to noncontrolling interest (NCI)	(3.4		)	1.2			(2.2		)	0			0			0			(2.2		)
Total other comprehensive income (loss) before reclassifications	420.6			(147.4		)	273.2			280.4			(5.2		)	0.2			(2.2		)
Less: Reclassification adjustment for amounts realized in net income by income statement line item:
Net impairment losses recognized in earnings	(3.6		)	1.3			(2.3		)	(2.3		)	0			0			0
Net realized gains (losses) on securities	88.8			(31.1		)	57.7			57.7			0			0			0
Interest expense	0.8			(0.3		)	0.5			0			0.5			0			0
Total reclassification adjustment for amounts realized in net income	86.0			(30.1		)	55.9			55.4			0.5			0			0
Total other comprehensive income (loss)	334.6			(117.3		)	217.3			225.0			(5.7		)	0.2			(2.2		)
Balance at June 30, 2017	$	1,774.1		$	(623.4	)	$	1,150.7		$	1,164.6		$	(15.1	)	$	(0.9	)	$	2.1

In an effort to manage interest rate risk, we often enter into forecasted transactions on Progressive’s debt issuances. We expect to reclassify $1.0 million (pretax) into interest expense during the next 12 months, related to net unrealized losses on forecasted transactions (see Note 4 – Debt for further discussion).

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Litigation

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Litigation

Litigation — The Progressive Corporation and/or its insurance subsidiaries are named as defendants in various lawsuits arising out of claims made under insurance policies written by our insurance subsidiaries in the ordinary course of business. We consider all legal actions relating to such claims in establishing our loss and loss adjustment expense reserves. In addition, The Progressive Corporation and/or its subsidiaries are named as defendants in a number of class action or individual lawsuits that challenge certain of the operations of the subsidiaries.

These cases include those alleging damages as a result of our subsidiaries’ practices in evaluating or paying medical or injury claims or benefits, including, but not limited to, personal injury protection, medical payments, and bodily injury benefits; the utilization, content, or appearance of policy documents; labor rates paid to auto body repair shops; wage and hour issues; and cases challenging other aspects of our subsidiaries’ claims, marketing, or sales practices, or other business operations. Other insurance companies face many of these same issues.

The nature and volume of litigation to which The Progressive Corporation is subject is similar to that which was disclosed in Note 12 – Litigation in our 2017 Annual Report to Shareholders.

We plan to contest the pending lawsuits vigorously, but may pursue settlement negotiations in some cases, if appropriate. The outcomes of pending cases are uncertain at this time. We establish accruals for these lawsuits when it is probable that a loss has been or will be incurred and we can reasonably estimate potential loss exposure, which may include a range of loss. As to lawsuits for which the loss is considered neither probable or estimable, or is considered probable but not estimable, we do not establish an accrual. Nevertheless, we continue to evaluate this pending litigation to determine if any losses not deemed probable and estimable become so, at which point we would establish an accrual at our best estimate of the loss or range of loss.

With respect to our pending lawsuits that are not related to claims under insurance policies, the accruals that we have established, if any, were not material at June 30, 2018 or 2017, and there were no material settlements during the first six months of 2018 or 2017. For most of these lawsuits, we do not consider any losses to be both probable and estimable, and we are unable to estimate a meaningful range of loss, if any, at this time, due to the factors discussed in Note 12 – Litigation in our 2017 Annual Report to Shareholders.In the event that any one or more of these lawsuits results in a substantial judgment against or settlement by us, or if our accruals (if any) prove to be inadequate by a significant amount, the resulting liability could have a material adverse effect on our consolidated financial condition, cash flows, and/or results of operations. For a further discussion on our pending litigation and related reserving policies, see Note 12 – Litigation in our 2017 Annual Report to Shareholders.

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Redeemable Noncontrolling Interest

6 Months Ended

Jun. 30, 2018

Temporary Equity Disclosure [Abstract]

Redeemable Noncontrolling Interest

Redeemable Noncontrolling Interest — In connection with the April 2015 acquisition of a controlling interest in ARX, The Progressive Corporation entered into a stockholders’ agreement with the other ARX stockholders. As part of the stockholders’ agreement, the minority ARX stockholders had the right to “put” a portion of their ARX shares to Progressive in 2018, and have the right to put all of their remaining shares to Progressive in 2021. During the second quarter 2018, the minority ARX stockholders put 204,527 shares, including 5,483 shares that were issued upon the exercise of outstanding stock options, bringing Progressive’s total ownership interest in ARX to 86.7%. Progressive acquired these additional shares, in a cash transaction, for a total cost of $295.9 million. If ARX stockholders do not put all of their shares to Progressive in 2021, Progressive has the ability to “call” all of the outstanding shares shortly thereafter and to bring its ownership stake to 100% in 2021. See Note 15 – Redeemable Noncontrolling Interest in our 2017 Annual Report to Shareholders for a discussion of the purchase price for shares to be purchased by Progressive pursuant to these put or call rights.

Since these securities are redeemable upon the occurrence of an event that is not solely within the control of Progressive, we have recorded the redeemable noncontrolling interest (NCI) as mezzanine equity on our consolidated balance sheets, which represents the minority shares at the current estimated purchase price pursuant to the put and call provisions of the stockholders’ agreement. The estimated purchase price is based, in part, on the change in tangible net book value of ARX from December 31, 2014 to the balance sheet dates.

In addition to these minority shares, at June 30, 2018, ARX employees held options to purchase 16,067 ARX shares. These options and any shares issued upon exercise are subject to the stockholders’ agreement, including the “put” and “call” rights described above. Until the options are exercised, the underlying obligation of approximately $23.2 million is not recorded as part of redeemable NCI. See Note 9 – Employee Benefit Plans in our 2017 Annual Report to Shareholders for a discussion of our employee stock options.

The changes in the components of redeemable NCI during the six months endedJune 30, 2018 and 2017, and the year ended December 31, 2017, were:

(millions)	June 30, 2018			June 30, 2017		December 31, 2017
Balance, Beginning of period	$	503.7		$	483.7	$	483.7
Net income attributable to NCI	8.8			11.1		5.9
Other comprehensive income (loss) attributable to NCI	(4.6		)	2.2		2.3
Exercise of employee stock options	9.4			3.4		3.4
Purchase of ARX shares	(295.9		)	0		0
Change in redemption value of NCI	(3.2		)	1.4		8.4
Balance, End of period	$	218.2		$	501.8	$	503.7

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Goodwill and Intangible Assets

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill and Intangible Assets

Goodwill

During the six months ended June 30, 2018, there were no changes to the carrying amount of goodwill. Goodwill recorded at June 30, 2018 and 2017, and December 31, 2017 was $452.7 million. No accumulated goodwill impairment losses exist.

Intangible Assets

The following table is a summary of the net carrying amount of other intangible assets as of June 30, 2018 and 2017, and December 31, 2017:

(millions)	June 30, 2018		June 30, 2017		December 31, 2017
Intangible assets subject to amortization	$	318.2	$	389.4	$	354.2
Indefinite-lived intangible assets1	12.4		12.4		12.4
Total	$	330.6	$	401.8	$	366.6

¹ Indefinite-lived intangible assets are comprised of state insurance and agent licenses. State insurance licenses were previously subject to amortization under superseded accounting guidance and have $0.6 million of accumulated amortization for all periods presented.

Intangible assets subject to amortization consisted of the following:

(millions)	June 30, 2018						June 30, 2017						December 31, 2017
Category	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Policies in force	$	256.2	$	119.0	$	137.2	$	256.2	$	82.4	$	173.8	$	256.2	$	100.7	$	155.5
Agency relationships	159.2		37.0		122.2		159.2		25.6		133.6		159.2		31.3		127.9
Software rights	79.1		34.7		44.4		79.1		24.1		55.0		79.1		29.4		49.7
Trade name	34.8		20.4		14.4		34.8		7.8		27.0		34.8		13.7		21.1
Total	$	529.3	$	211.1	$	318.2	$	529.3	$	139.9	$	389.4	$	529.3	$	175.1	$	354.2

Amortization expense was $18.0 million and $36.0 million for the three and six months ended June 30, 2018, respectively, compared to $15.5 million and $31.0 million during the same periods last year.

During the third quarter 2017, we revised our estimate of the economic useful life of our trade name intangible asset from an original life of 10 years to a remaining life of 2 years. The decrease in the useful life represents the estimated length of time that it is expected to take to transition the branding of our Property products from the ASI trade name to the Progressive brand. As of June 30, 2018, the remaining average life of all of our intangible assets is 4.4 years.

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New Accounting Standards

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

New Accounting Standards

New Accounting Standards

Issued

In January 2018, the Financial Accounting Standards Board (FASB) proposed an Accounting Standards Update (ASU), which would provide targeted improvements to the new lease accounting guidance issued by the FASB in February 2016 (the “2016 ASU”). The 2016 ASU, which eliminates the off-balance-sheet accounting for leases, will require lessees to report their operating leases as both an asset and liability on the statement of financial position and to disclose key information about leasing arrangements in the financial statement footnotes. Under the 2016 ASU, there will be no change to the recognition of lease expense in our results of operations. The 2016 ASU will be effective for fiscal years (including interim periods within those fiscal years) beginning after December 15, 2018 (2019 for calendar-year companies). Under the proposed guidance, companies would have the option to apply the new lease requirements either as of the effective date (i.e., January 1, 2019), with comparative information presented in accordance with the previous standard, or on a modified retrospective basis, which would restate all financial statement information as of the beginning of the earliest period presented and is the transition method under the 2016 ASU. Based on our lease portfolio at June 30, 2018, and in accordance with the accounting elections available in the 2016 ASU, we would have recorded an increase to assets and liabilities of approximately $140 million, and there would have been no impact on our results of operations or cash flows. Therefore, we do not expect this standard to have a material impact on our financial condition.

In March 2017, the FASB issued an ASU related to premium amortization on purchased callable debt securities. The intent of the standard is to shorten the amortization period for certain purchased callable debt securities held at a premium. Under the ASU, the premium is required to be amortized to the earliest call date. The ASU more closely aligns interest income recorded on bonds held at a premium with the economics of the underlying instrument. The ASU, which is required to be applied on a modified retrospective basis, is effective for fiscal years beginning after December 15, 2018 (2019 for calendar-year companies), and interim periods within those fiscal years. Since we have historically used a yield-to-worst scenario for our securities that were purchased at a premium, and the first call on a premium security most often produces the lowest and most conservative yield, we do not expect this standard to have a significant impact on our financial condition, cash flows, or results of operations.

In January 2017, the FASB issued an ASU, which eliminates the requirement to determine the implied fair value of goodwill in measuring an impairment loss. Upon adoption, the measurement of a goodwill impairment will represent the excess of the reporting unit’s carrying value over fair value, limited to the carrying value of goodwill. This ASU is effective for goodwill impairment tests in fiscal years beginning after December 15, 2019 (2020 for calendar-year companies), with early adoption permitted. We do not expect this standard to have a material impact on our financial position or results of operations.

In June 2016, the FASB issued an ASU intended to improve the timing, and enhance the accounting and disclosure, of credit losses on financial assets. Additionally, this update will modify the existing accounting guidance related to the impairment evaluation for available-for-sale debt securities and will result in the creation of an allowance for credit losses as a contra asset account. The ASU will require cumulative-effect changes to retained earnings in the period of adoption, if any occur, and will also require prospective changes on previously recorded impairments. This ASU is effective for fiscal years (including interim periods within those fiscal years) beginning after December 15, 2019 (2020 for calendar-year companies), with early adoption permissible (including interim periods within that fiscal year) beginning after December 15, 2018 (2019 for calendar-year companies). While the ASU creates additional accounting complexities related to the recognition of the impairment losses, and subsequent recoveries, through an allowance for credit losses account, we do not expect the ASU to have a material impact on our current method of evaluating securities for credit losses or the timing or recognition of the amounts of the impairment losses.

Adopted

On January 1, 2018, we adopted the ASU intended to improve the recognition and measurement of financial instruments. Under this update, the changes in fair value of equity securities are recognized as a component of net income. Upon adoption, we recorded a cumulative-effect adjustment of $1.3 billion, which is net of taxes. The cumulative-effect adjustment represents the amount of after-tax net unrealized gains on equity securities that was recorded as part of accumulated other comprehensive income at December 31, 2017. The adoption of this ASU had no impact on comprehensive income. Consistent with our historical presentation, cash flows on equity securities will be reflected as investing activities in the Consolidated Statements of Cash Flows.

In the first quarter 2018, we adopted the ASU related to the reclassification of certain tax effects from accumulated other comprehensive income. This update provided companies with the option to reclassify disproportionate tax effects in accumulated other comprehensive income caused by the legislation commonly known as the Tax Cuts and Jobs Act of 2017 to retained earnings. We opted to make the reclassification, which resulted in a decrease to accumulated other comprehensive income and an offsetting increase to retained earnings of $4.3 million. This reclass was solely due to the effect of the change in the U.S. federal tax rate on our available-for-sale fixed-maturity securities and our hedges on forecasted transactions. There were no disproportionate tax effects related to our equity securities subsequent to adopting the ASU related to classification and measurement discussed above.

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Reclassification (Notes)

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Reclassifications [Text Block]

Reclassification — For the three and six months ended June 30, 2017, we reclassified the change in the net holding period gains (losses) on hybrid securities held at June 30, 2017 to “net holding period gains (losses) on securities” out of “net realized gains (losses) on security sales” to conform with the current-year Consolidated Statements of Comprehensive Income presentation. There was no overall impact on total net realized gains (losses) on securities. We also reclassified the classification and presentation of restricted cash in our Consolidated Statements of Cash Flows in accordance with the accounting guidance we adopted for the year ended December 31, 2017 relating to this item; there was no overall impact on the increase in cash, cash equivalents, and restricted cash as a result of this reclassification. In addition, on our Consolidated Balance Sheets for December 31, 2017, we reclassified our “dividends payable” into “accounts payable, accrued expenses, and other liabilities” to be consistent with the current period presentation.

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Investments (Tables)

6 Months Ended

Jun. 30, 2018

Investments Schedule [Abstract]

Schedule of Debt and Equity Securities Reconciliation [Table Text Block]

The following tables present the composition of our investment portfolio by major security type, consistent with our classification of how we manage, monitor, and measure the portfolio. Our securities are reported in our Consolidated Balance Sheets at fair value, with all of our equity securities having a readily determinable fair value. The changes in fair value for our fixed-maturity securities (other than hybrid securities) are reported as a component of accumulated other comprehensive income, net of deferred income taxes, in our Consolidated Balance Sheets.

The net holding period gains (losses) reported below represent the inception-to-date changes in fair value. The changes in the net holding period gains (losses) between periods for the hybrid securities and, beginning in 2018, equity securities are recorded as a component of net realized gains (losses) on securities in our Consolidated Statements of Comprehensive Income. Prior to 2018, the change in fair value of our equity securities was part of accumulated other comprehensive income (see Note 14 – New Accounting Standards for further discussion).

($ in millions)	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Net Holding Period Gains (Losses)			Fair Value		% of Total Fair Value
June 30, 2018
Available-for-sale securities:
Fixed maturities:
U.S. government obligations	$	8,005.8	$	0.9	$	(141.3	)	$	0		$	7,865.4	25.4	%
State and local government obligations	1,678.9		4.3		(15.9		)	0			1,667.3		5.4
Foreign government obligations	0		0		0			0			0		0
Corporate debt securities	7,422.4		4.2		(94.3		)	(2.0		)	7,330.3		23.7
Residential mortgage-backed securities	819.6		8.4		(5.4		)	0			822.6		2.7
Commercial mortgage-backed securities	2,725.5		2.9		(31.5		)	0			2,696.9		8.7
Other asset-backed securities	3,189.2		2.0		(13.7		)	0.1			3,177.6		10.3
Redeemable preferred stocks	220.4		14.1		(2.0		)	(3.4		)	229.1		0.7
Total fixed maturities	24,061.8		36.8		(304.1		)	(5.3		)	23,789.2		76.9
Short-term investments	3,231.2		0		0			0			3,231.2		10.5
Total available-for-sale securities	27,293.0		36.8		(304.1		)	(5.3		)	27,020.4		87.4
Equity securities:
Nonredeemable preferred stocks	677.0		0		0			81.6			758.6		2.4
Common equities	1,314.0		0		0			1,828.2			3,142.2		10.2
Total equity securities	1,991.0		0		0			1,909.8			3,900.8		12.6
Total portfolio1,2	$	29,284.0	$	36.8	$	(304.1	)	$	1,904.5		$	30,921.2	100.0	%

($ in millions)	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Net Holding Period Gains (Losses)		Fair Value		% of Total Fair Value
June 30, 2017
Fixed maturities:
U.S. government obligations	$	4,166.4	$	4.4	$	(15.8	)	$	0	$	4,155.0	16.0	%
State and local government obligations	2,473.3		32.5		(5.9		)	0.2		2,500.1		9.7
Foreign government obligations	22.5		0		0			0		22.5		0.1
Corporate debt securities	4,991.6		29.4		(7.6		)	0.4		5,013.8		19.3
Residential mortgage-backed securities	1,260.3		10.9		(5.9		)	2.3		1,267.6		4.8
Commercial mortgage-backed securities	2,364.9		19.8		(9.7		)	0		2,375.0		9.1
Other asset-backed securities	2,843.3		6.4		(2.5		)	0.2		2,847.4		11.0
Redeemable preferred stocks	189.4		19.0		(1.7		)	0		206.7		0.8
Total fixed maturities	18,311.7		122.4		(49.1		)	3.1		18,388.1		70.8
Equity securities:
Nonredeemable preferred stocks	666.0		123.6		(6.5		)	0		783.1		3.0
Common equities	1,472.3		1,611.7		(6.5		)	0		3,077.5		11.8
Short-term investments	3,729.7		0		0			0		3,729.7		14.4
Total portfolio1,2	$	24,179.7	$	1,857.7	$	(62.1	)	$	3.1	$	25,978.4	100.0	%

($ in millions)	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Net Holding Period Gains (Losses)			Fair Value		% of Total Fair Value
December 31, 2017
Fixed maturities:
U.S. government obligations	$	6,688.8	$	1.1	$	(44.0	)	$	0		$	6,645.9	24.4	%
State and local government obligations	2,285.6		20.7		(9.3		)	0.1			2,297.1		8.4
Foreign government obligations	0		0		0			0			0		0
Corporate debt securities	4,997.2		14.8		(14.4		)	0.1			4,997.7		18.3
Residential mortgage-backed securities	828.8		11.3		(3.4		)	0			836.7		3.1
Commercial mortgage-backed securities	2,760.1		11.8		(13.3		)	0			2,758.6		10.1
Other asset-backed securities	2,454.5		4.5		(4.5		)	0.2			2,454.7		9.0
Redeemable preferred stocks	194.9		17.8		(1.5		)	(0.2		)	211.0		0.8
Total fixed maturities	20,209.9		82.0		(90.4		)	0.2			20,201.7		74.1
Equity securities:
Nonredeemable preferred stocks	698.6		114.0		(8.8		)	0			803.8		2.9
Common equities	1,499.0		1,901.0		(0.2		)	0			3,399.8		12.5
Short-term investments	2,869.4		0		0			0			2,869.4		10.5
Total portfolio1,2	$	25,276.9	$	2,097.0	$	(99.4	)	$	0.2		$	27,274.7	100.0	%

¹Our portfolio reflects the effect of unsettled security transactions; at June 30, 2018 and 2017, we had $362.1 million and $287.1 million, respectively, included in “other liabilities,” compared to $5.8 million included in “other assets” at December 31, 2017.

²The total fair value of the portfolio at June 30, 2018 and 2017, and December 31, 2017, included $1.7 billion, $1.1 billion, and $1.6 billion, respectively, of securities held in a consolidated, non-insurance subsidiary of the holding company, net of any unsettled security transactions.

Hybrid Instruments Table [Table Text Block]

Included in our fixed-maturity securities are hybrid securities, which are reported at fair value:

	June 30,
(millions)	2018		2017		December 31, 2017
Fixed maturities:
State and local government obligations	$	3.6	$	6.6	$	6.1
Corporate debt securities	170.3		61.3		99.8
Residential mortgage-backed securities	0		189.7		0
Other asset-backed securities	5.5		7.7		6.7
Redeemable preferred stocks	67.3		0		30.3
Total hybrid securities	$	246.7	$	265.3	$	142.9

Investments Classified by Contractual Maturity Date [Table Text Block]

The composition of fixed maturities by maturity at June 30, 2018, was:

(millions)	Cost		Fair Value
Less than one year	$	3,805.2	$	3,809.2
One to five years	15,190.7		14,999.1
Five to ten years	4,939.7		4,855.4
Ten years or greater	126.2		125.5
Total	$	24,061.8	$	23,789.2

Schedule of Unrealized Loss on Investments [Table Text Block]

The following tables show the composition of gross unrealized losses by major security type and by the length of time that individual securities have been in a continuous unrealized loss position:

	Total No. of Sec.	Total Fair Value		Gross Unrealized Losses			Less than 12 Months						12 Months or Greater
($ in millions)							No. of Sec.	Fair Value		Unrealized Losses			No. of Sec.	Fair Value		Unrealized Losses
June 30, 2018
Fixed maturities:
U.S. government obligations	70	$	7,503.2	$	(141.3	)	33	$	4,543.5	$	(73.6	)	37	$	2,959.7	$	(67.7	)
State and local government obligations	355	1,050.9		(15.9		)	219	631.9		(7.1		)	136	419.0		(8.8		)
Corporate debt securities	391	6,153.5		(94.3		)	322	5,439.3		(77.2		)	69	714.2		(17.1		)
Residential mortgage-backed securities	227	380.3		(5.4		)	52	188.6		(0.9		)	175	191.7		(4.5		)
Commercial mortgage-backed securities	142	2,300.9		(31.5		)	85	1,371.4		(14.4		)	57	929.5		(17.1		)
Other asset-backed securities	219	2,479.7		(13.7		)	148	2,055.1		(8.5		)	71	424.6		(5.2		)
Redeemable preferred stocks	3	30.2		(2.0		)	1	4.6		(0.2		)	2	25.6		(1.8		)
Total fixed maturities	1,407	$	19,898.7	$	(304.1	)	860	$	14,234.4	$	(181.9	)	547	$	5,664.3	$	(122.2	)

	Total No. of Sec.	Total Fair Value		Gross Unrealized Losses			Less than 12 Months						12 Months or Greater
($ in millions)							No. of Sec.	Fair Value		Unrealized Losses			No. of Sec.	Fair Value		Unrealized Losses
June 30, 2017
Fixed maturities:
U.S. government obligations	41	$	2,781.8	$	(15.8	)	39	$	2,725.1	$	(15.1	)	2	$	56.7	$	(0.7	)
State and local government obligations	222	818.7		(5.9		)	138	479.8		(3.3		)	84	338.9		(2.6		)
Corporate debt securities	143	1,905.2		(7.6		)	122	1,599.6		(5.3		)	21	305.6		(2.3		)
Residential mortgage-backed securities	220	535.7		(5.9		)	126	197.8		(1.1		)	94	337.9		(4.8		)
Commercial mortgage-backed securities	74	905.6		(9.7		)	52	679.5		(5.7		)	22	226.1		(4.0		)
Other asset-backed securities	160	2,077.8		(2.5		)	145	1,823.8		(1.9		)	15	254.0		(0.6		)
Redeemable preferred stocks	1	10.8		(1.7		)	0	0		0			1	10.8		(1.7		)
Total fixed maturities	861	9,035.6		(49.1		)	622	7,505.6		(32.4		)	239	1,530.0		(16.7		)
Equity securities:
Nonredeemable preferred stocks	3	73.1		(6.5		)	0	0		0			3	73.1		(6.5		)
Common equities	80	73.1		(6.5		)	74	72.3		(6.5		)	6	0.8		0
Total equity securities	83	146.2		(13.0		)	74	72.3		(6.5		)	9	73.9		(6.5		)
Total portfolio	944	$	9,181.8	$	(62.1	)	696	$	7,577.9	$	(38.9	)	248	$	1,603.9	$	(23.2	)

	Total No. of Sec.	Total Fair Value		Gross Unrealized Losses			Less than 12 Months						12 Months or Greater
($ in millions)							No. of Sec.	Fair Value		Unrealized Losses			No. of Sec.	Fair Value		Unrealized Losses
December 31, 2017
Fixed maturities:
U.S. government obligations	58	$	5,817.0	$	(44.0	)	41	$	4,869.3	$	(34.6	)	17	$	947.7	$	(9.4	)
State and local government obligations	358	1,200.3		(9.3		)	230	737.6		(4.4		)	128	462.7		(4.9		)
Corporate debt securities	222	2,979.4		(14.4		)	171	2,072.9		(9.1		)	51	906.5		(5.3		)
Residential mortgage-backed securities	201	300.9		(3.4		)	30	75.1		(0.2		)	171	225.8		(3.2		)
Commercial mortgage-backed securities	105	1,682.3		(13.3		)	63	1,221.2		(5.9		)	42	461.1		(7.4		)
Other asset-backed securities	197	1,837.3		(4.5		)	134	1,377.8		(3.3		)	63	459.5		(1.2		)
Redeemable preferred stocks	2	21.8		(1.5		)	1	10.8		(0.1		)	1	11.0		(1.4		)
Total fixed maturities	1,143	13,839.0		(90.4		)	670	10,364.7		(57.6		)	473	3,474.3		(32.8		)
Equity securities:
Nonredeemable preferred stocks	4	127.8		(8.8		)	1	56.5		(0.5		)	3	71.3		(8.3		)
Common equities	19	13.4		(0.2		)	18	13.4		(0.2		)	1	0		0
Total equity securities	23	141.2		(9.0		)	19	69.9		(0.7		)	4	71.3		(8.3		)
Total portfolio	1,166	$	13,980.2	$	(99.4	)	689	$	10,434.6	$	(58.3	)	477	$	3,545.6	$	(41.1	)

Non Credit Portion Of Other Than Temporary Impairment Recorded In Accumulated Other Comprehensive Income Table [Table Text Block]

The following table shows the total non-credit portion of the OTTI recorded in accumulated other comprehensive income, reflecting the original non-credit loss at the time the credit impairment was determined (i.e., unadjusted for valuation changes subsequent to the original write-down):

	June 30,						December 31, 2017
(millions)	2018			2017
Fixed maturities:
Residential mortgage-backed securities	$	(19.7	)	$	(19.7	)	$	(19.7	)
Commercial mortgage-backed securities	(0.3		)	(0.5		)	(0.3		)
Total fixed maturities	$	(20.0	)	$	(20.2	)	$	(20.0	)

Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]

The following tables provide rollforwards of the amounts related to credit losses recognized in earnings for the periods ended June 30, 2018 and 2017, for which a portion of the OTTI losses were also recognized in accumulated other comprehensive income at the time the credit impairments were determined and recognized:

	Three Months Ended June 30, 2018
	Mortgage-Backed
(millions)	Residential		Commercial		Total
Balance at March 31, 2018	$	0	$	0.5	$	0.5
Reductions for securities sold/matured	0		0		0
Change in recoveries of future cash flows expected to be collected1	0.3		0		0.3
Balance at June 30, 2018	$	0.3	$	0.5	$	0.8
	Six Months Ended June 30, 2018
	Mortgage-Backed
(millions)	Residential		Commercial		Total
Balance at December 31, 2017	$	0	$	0.5	$	0.5
Reductions for securities sold/matured	0		0		0
Change in recoveries of future cash flows expected to be collected1	0.3		0		0.3
Balance at June 30, 2018	$	0.3	$	0.5	$	0.8

	Three Months Ended June 30, 2017
	Mortgage-Backed
(millions)	Residential			Commercial			Total
Balance at March 31, 2017	$	11.4		$	0.1		$	11.5
Reductions for securities sold/matured	(11.4		)	0			(11.4		)
Change in recoveries of future cash flows expected to be collected1	0.2			0			0.2
Balance at June 30, 2017	$	0.2		$	0.1		$	0.3
	Six Months Ended June 30, 2017
	Mortgage-Backed
(millions)	Residential			Commercial			Total
Balance at December 31, 2016	$	11.1		$	0.4		$	11.5
Reductions for securities sold/matured	(10.9		)	(0.3		)	(11.2		)
Change in recoveries of future cash flows expected to be collected1	0			0			0
Balance at June 30, 2017	$	0.2		$	0.1		$	0.3

¹Reflects the current period change in the expected recovery of prior impairments that will be accreted into income over the remaining life of the security.

Realized Gain (Loss) on Investments [Table Text Block]

The components of net realized gains (losses) for the three and six months ended June 30, were:

	Three Months						Six Months
(millions)	2018			2017			2018			2017
Gross realized gains on security sales
Available-for-sale securities:
U.S. government obligations	$	1.7		$	4.5		$	1.7		$	4.9
State and local government obligations	0.6			2.6			9.2			3.1
Corporate and other debt securities	0.3			7.3			0.4			11.4
Residential mortgage-backed securities	0			20.9			0			21.0
Commercial mortgage-backed securities	0.3			1.2			2.0			2.4
Other asset-backed securities	0.1			0			0.1			0.3
Redeemable preferred stocks	3.2			0			4.3			0.3
Total available-for-sale securities	6.2			36.5			17.7			43.4
Equity securities:
Nonredeemable preferred stocks	0			6.2			3.6			51.6
Common equities	18.5			9.9			138.4			17.3
Total equity securities	18.5			16.1			142.0			68.9
Subtotal gross realized gains on security sales	24.7			52.6			159.7			112.3
Gross realized losses on security sales
Available-for-sale securities:
U.S. government obligations	(29.9		)	(0.4		)	(38.8		)	(3.6		)
State and local government obligations	(0.6		)	0			(1.9		)	(0.1		)
Corporate and other debt securities	(1.0		)	(1.9		)	(4.1		)	(2.8		)
Residential mortgage-backed securities	0			(0.3		)	0			(0.3		)
Commercial mortgage-backed securities	0			(0.7		)	(6.3		)	(3.1		)
Other asset-backed securities	(0.9		)	0			(1.0		)	0
Total available-for-sale securities	(32.4		)	(3.3		)	(52.1		)	(9.9		)
Equity securities:
Nonredeemable preferred stocks	(1.9		)	(4.6		)	(2.3		)	(5.8		)
Common equities	0			0			(7.9		)	(0.1		)
Total equity securities	(1.9		)	(4.6		)	(10.2		)	(5.9		)
Subtotal gross realized losses on security sales	(34.3		)	(7.9		)	(62.3		)	(15.8		)
Net realized gains (losses) on security sales
Available-for-sale securities:
U.S. government obligations	(28.2		)	4.1			(37.1		)	1.3
State and local government obligations	0			2.6			7.3			3.0
Corporate and other debt securities	(0.7		)	5.4			(3.7		)	8.6
Residential mortgage-backed securities	0			20.6			0			20.7
Commercial mortgage-backed securities	0.3			0.5			(4.3		)	(0.7		)
Other asset-backed securities	(0.8		)	0			(0.9		)	0.3
Redeemable preferred stocks	3.2			0			4.3			0.3
Total available-for-sale securities	(26.2		)	33.2			(34.4		)	33.5
Equity securities:
Nonredeemable preferred stocks	(1.9		)	1.6			1.3			45.8
Common equities	18.5			9.9			130.5			17.2
Total equity securities	16.6			11.5			131.8			63.0
Litigation settlements and other gains (losses)	0			0.8			0			1.1
Subtotal net realized gains (losses) on security sales	(9.6		)	45.5			97.4			97.6
Net holding period gains (losses)
Hybrid securities	(2.3		)	0.4			(5.5		)	1.2
Equity securities	55.8			0			(96.2		)	0
Subtotal net holding period gains (losses)	53.5			0.4			(101.7		)	1.2
Other-than-temporary impairment losses
Equity securities:
Common equities	0			(2.6		)	0			(3.6		)
Subtotal investment other-than-temporary impairment losses	0			(2.6		)	0			(3.6		)
Other asset impairment	(11.1		)	(11.2		)	(11.1		)	(11.2		)
Subtotal other-than-temporary impairment losses	(11.1		)	(13.8		)	(11.1		)	(14.8		)
Total net realized gains (losses) on securities	$	32.8		$	32.1		$	(15.4	)	$	84.0

Components of Equity Realized Gains (Losses) [Table Text Block]

The following table reflects our holding period realized gains (losses) on equity securities recognized for the three and six months ended June 30, 2018 for equity securities held at quarter end:

	Three Months		Six Months
(millions)	2018		2018
Total net gains (losses) recognized during the period on equity securities	$	72.4	$	35.6
Less: Net gains (losses) recognized on equity securities sold during the period	16.6		131.8
Net holding period gains (losses) recognized during the period on equity securities held at period end	$	55.8	$	(96.2	)

Note: Comparative disclosure for the prior year period is not meaningful.

Components of Net Investment Income

The components of net investment income for the three and six months ended June 30, were:

	Three Months						Six Months
(millions)	2018			2017			2018			2017
Available-for-sale securities:
Fixed maturities:
U.S. government obligations	$	45.9		$	17.0		$	85.7		$	29.7
State and local government obligations	9.1			13.1			19.1			26.4
Foreign government obligations	0			0.1			0			0.2
Corporate debt securities	51.8			31.3			88.0			60.9
Residential mortgage-backed securities	6.6			10.3			13.5			19.9
Commercial mortgage-backed securities	20.2			18.3			41.4			37.1
Other asset-backed securities	16.1			11.8			29.7			21.7
Redeemable preferred stocks	2.9			2.9			5.5			6.3
Total fixed maturities	152.6			104.8			282.9			202.2
Short-term investments	14.9			8.8			25.0			15.8
Total available-for-sale securities	167.5			113.6			307.9			218.0
Equity securities:
Nonredeemable preferred stocks	10.4			10.6			21.3			22.1
Common equities	14.2			14.6			29.2			27.9
Total equity securities	24.6			25.2			50.5			50.0
Investment income	192.1			138.8			358.4			268.0
Investment expenses	(6.2		)	(6.6		)	(12.2		)	(12.2		)
Net investment income	$	185.9		$	132.2		$	346.2		$	255.8

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Fair Value (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Composition of Investment Portfolio by Major Security Type

The composition of the investment portfolio by major security type and our outstanding debt was:

	Fair Value
(millions)	Level 1		Level 2		Level 3		Total		Cost
June 30, 2018
Fixed maturities:
U.S. government obligations	$	7,865.4	$	0	$	0	$	7,865.4	$	8,005.8
State and local government obligations	0		1,667.3		0		1,667.3		1,678.9
Foreign government obligations	0		0		0		0		0
Corporate debt securities	0		7,330.3		0		7,330.3		7,422.4
Subtotal	7,865.4		8,997.6		0		16,863.0		17,107.1
Asset-backed securities:
Residential mortgage-backed	0		822.6		0		822.6		819.6
Commercial mortgage-backed	0		2,696.9		0		2,696.9		2,725.5
Other asset-backed	0		3,177.6		0		3,177.6		3,189.2
Subtotal asset-backed securities	0		6,697.1		0		6,697.1		6,734.3
Redeemable preferred stocks:
Financials	0		67.7		0		67.7		65.3
Utilities	0		4.6		0		4.6		4.8
Industrials	10.1		146.7		0		156.8		150.3
Subtotal redeemable preferred stocks	10.1		219.0		0		229.1		220.4
Total fixed maturities	7,875.5		15,913.7		0		23,789.2		24,061.8
Short-term investments	2,954.2		277.0		0		3,231.2		3,231.2
Total available-for-sale securities	10,829.7		16,190.7		0		27,020.4		27,293.0
Equity securities:
Nonredeemable preferred stocks:
Financials	77.4		676.2		0		753.6		672.0
Industrials	0		0		5.0		5.0		5.0
Subtotal nonredeemable preferred stocks	77.4		676.2		5.0		758.6		677.0
Common equities:
Common stocks	3,141.9		0		0		3,141.9		1,313.7
Other risk investments	0		0		0.3		0.3		0.3
Subtotal common equities	3,141.9		0		0.3		3,142.2		1,314.0
Total equity securities	3,219.3		676.2		5.3		3,900.8		1,991.0
Total portfolio	$	14,049.0	$	16,866.9	$	5.3	$	30,921.2	$	29,284.0
Debt	$	0	$	3,959.0	$	0	$	3,959.0	$	3,859.5

	Fair Value
(millions)	Level 1		Level 2		Level 3		Total		Cost
June 30, 2017
Fixed maturities:
U.S. government obligations	$	4,155.0	$	0	$	0	$	4,155.0	$	4,166.4
State and local government obligations	0		2,500.1		0		2,500.1		2,473.3
Foreign government obligations	22.5		0		0		22.5		22.5
Corporate debt securities	0		5,013.8		0		5,013.8		4,991.6
Subtotal	4,177.5		7,513.9		0		11,691.4		11,653.8
Asset-backed securities:
Residential mortgage-backed	0		1,267.6		0		1,267.6		1,260.3
Commercial mortgage-backed	0		2,375.0		0		2,375.0		2,364.9
Other asset-backed	0		2,847.4		0		2,847.4		2,843.3
Subtotal asset-backed securities	0		6,490.0		0		6,490.0		6,468.5
Redeemable preferred stocks:
Financials	0		64.1		0		64.1		60.4
Utilities	0		32.2		0		32.2		30.5
Industrials	0		110.4		0		110.4		98.5
Subtotal redeemable preferred stocks	0		206.7		0		206.7		189.4
Total fixed maturities	4,177.5		14,210.6		0		18,388.1		18,311.7
Equity securities:
Nonredeemable preferred stocks:
Financials	85.3		697.8		0		783.1		666.0
Industrials	0		0		0		0		0
Subtotal nonredeemable preferred stocks	85.3		697.8		0		783.1		666.0
Common equities:
Common stocks	3,077.2		0		0		3,077.2		1,472.0
Other risk investments	0		0		0.3		0.3		0.3
Subtotal common equities	3,077.2		0		0.3		3,077.5		1,472.3
Total fixed maturities and equity securities	7,340.0		14,908.4		0.3		22,248.7		20,450.0
Short-term investments	2,448.0		1,281.7		0		3,729.7		3,729.7
Total portfolio	$	9,788.0	$	16,190.1	$	0.3	$	25,978.4	$	24,179.7
Debt	$	0	$	3,564.4	$	114.8	$	3,679.2	$	3,383.4

	Fair Value
(millions)	Level 1		Level 2		Level 3		Total		Cost
December 31, 2017
Fixed maturities:
U.S. government obligations	$	6,645.9	$	0	$	0	$	6,645.9	$	6,688.8
State and local government obligations	0		2,297.1		0		2,297.1		2,285.6
Foreign government obligations	0		0		0		0		0
Corporate debt securities	0		4,997.7		0		4,997.7		4,997.2
Subtotal	6,645.9		7,294.8		0		13,940.7		13,971.6
Asset-backed securities:
Residential mortgage-backed	0		836.7		0		836.7		828.8
Commercial mortgage-backed	0		2,758.6		0		2,758.6		2,760.1
Other asset-backed	0		2,454.7		0		2,454.7		2,454.5
Subtotal asset-backed securities	0		6,050.0		0		6,050.0		6,043.4
Redeemable preferred stocks:
Financials	0		64.1		0		64.1		61.3
Utilities	0		11.4		0		11.4		10.1
Industrials	0		135.5		0		135.5		123.5
Subtotal redeemable preferred stocks	0		211.0		0		211.0		194.9
Total fixed maturities	6,645.9		13,555.8		0		20,201.7		20,209.9
Equity securities:
Nonredeemable preferred stocks:
Financials	80.6		718.2		0		798.8		693.6
Industrials	0		0		5.0		5.0		5.0
Subtotal nonredeemable preferred stocks	80.6		718.2		5.0		803.8		698.6
Common equities:
Common stocks	3,399.5		0		0		3,399.5		1,498.7
Other risk investments	0		0		0.3		0.3		0.3
Subtotal common equities	3,399.5		0		0.3		3,399.8		1,499.0
Total fixed maturities and equity securities	10,126.0		14,274.0		5.3		24,405.3		22,407.5
Short-term investments	1,824.4		1,045.0		0		2,869.4		2,869.4
Total portfolio	$	11,950.4	$	15,319.0	$	5.3	$	27,274.7	$	25,276.9
Debt	$	0	$	3,606.5	$	37.1	$	3,643.6	$	3,306.3

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Debt (Tables)

6 Months Ended

Jun. 30, 2018

Debt Table

Debt at each of the balance sheet periods consisted of:

	June 30, 2018				June 30, 2017				December 31, 2017
(millions)	Carrying Value		Fair Value		Carrying Value		Fair Value		Carrying Value		Fair Value
3.75% Senior Notes due 2021	$	498.9	$	506.4	$	498.6	$	528.0	$	498.8	$	520.7
2.45% Senior Notes due 2027	496.3		451.3		496.0		474.2		496.1		477.9
6 5/8% Senior Notes due 2029	296.2		364.4		296.0		389.0		296.1		382.3
6.25% Senior Notes due 2032	395.4		492.5		395.2		522.7		395.3		516.9
4.35% Senior Notes due 2044	346.6		356.7		346.5		376.5		346.5		388.7
3.70% Senior Notes due 2045	395.3		363.9		395.2		389.7		395.2		402.9
4.125% Senior Notes due 2047	841.3		831.5		841.1		884.3		841.2		917.1
4.20% Senior Notes due 2048	589.5		592.3		0		0		0		0
Other debt instruments	0		0		114.8		114.8		37.1		37.1
Total	$	3,859.5	$	3,959.0	$	3,383.4	$	3,679.2	$	3,306.3	$	3,643.6

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Loss and Loss Adjustment Expense Reserves (Tables)

6 Months Ended

Jun. 30, 2018

Loss and Loss Adjustment Expenses Reserves [Abstract]

Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]

Activity in the loss and loss adjustment expense reserves is summarized as follows:

	June 30,
(millions)	2018		2017
Balance, Beginning of period	$	13,086.9	$	11,368.0
Less reinsurance recoverables on unpaid losses	2,170.1		1,801.0
Net balance, Beginning of period	10,916.8		9,567.0
Incurred related to:
Current year	10,164.6		8,804.1
Prior years	81.5		74.2
Total incurred	10,246.1		8,878.3
Paid related to:
Current year	5,533.7		4,951.0
Prior years	3,851.5		3,381.8
Total paid	9,385.2		8,332.8
Net balance, End of period	11,777.7		10,112.5
Plus reinsurance recoverables on unpaid losses	2,293.1		1,947.9
Balance, End of period	$	14,070.8	$	12,060.4

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Supplemental Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2018

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information Table

We paid the following in the respective periods:

	Six Months Ended June 30,
(millions)	2018		2017
Income taxes	$	358.9	$	452.9
Interest	70.9		73.3

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Segment Information (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Reconciliation of Revenue and operating Income from Segments to Consolidated

Following are the operating results for the respective periods:

	Three Months Ended June 30,										Six Months Ended June 30,
	2018					2017					2018					2017
(millions)	Revenues		Pretax Profit (Loss)			Revenues		Pretax Profit (Loss)			Revenues		Pretax Profit (Loss)			Revenues		Pretax Profit (Loss)
Personal Lines
Agency	$	3,225.7	$	360.9		$	2,752.5	$	205.5		$	6,289.5	$	770.0		$	5,384.0	$	455.2
Direct	3,211.8		287.9			2,650.0		162.7			6,228.1		585.9			5,173.7		338.0
Total Personal Lines1	6,437.5		648.8			5,402.5		368.2			12,517.6		1,355.9			10,557.7		793.2
Commercial Lines	884.3		100.3			671.7		56.2			1,692.9		195.1			1,317.2		123.6
Property2	312.4		(51.9		)	239.1		3.7			597.7		(23.4		)	465.1		11.5
Other indemnity	0		0			0		(0.1		)	0		0.2			0		(0.3		)
Total underwriting operations	7,634.2		697.2			6,313.3		428.0			14,808.2		1,527.8			12,340.0		928.0
Fees and other revenues3	116.0		NA			88.8		NA			219.8		NA			174.0		NA
Service businesses	42.9		5.9			32.7		5.7			77.1		10.8			61.2		8.3
Investments4	224.9		218.7			170.9		164.3			343.0		330.8			352.0		339.8
Other gains (losses)	0		0			0		0			0		0			0.2		0.2
Interest expense	NA		(41.7		)	NA		(43.4		)	NA		(78.5		)	NA		(80.2		)
Consolidated total	$	8,018.0	$	880.1		$	6,605.7	$	554.6		$	15,448.1	$	1,790.9		$	12,927.4	$	1,196.1

NA = Not applicable

¹ Personal auto insurance accounted for 94% of the total Personal Lines segment net premiums earned during the three and six months ended June 30, 2018, and 93% for the same periods in 2017; insurance for our special lines products (e.g., motorcycles, ATVs, RVs, watercraft, and snowmobiles) accounted for the balance of the Personal Lines net premiums earned.

² For the three and six months ended June 30, 2018, pretax profit (loss) includes $18.0 million and $36.0 million, respectively, of amortization expense predominately associated with the acquisition of a controlling interest in ARX and $15.5 million and $31.0 million for the same periods in 2017. Although this expense is included in our Property segment, it is not reported in the consolidated results of ARX and, therefore, will not affect the value of net income (loss) attributable to noncontrolling interest.

³ Pretax profit (loss) for fees and other revenues is attributable to operating segments.

⁴ Revenues represent recurring investment income and total net realized gains (losses) on securities; pretax profit is net of investment expense.

Underwriting Margins and Combined Ratios for our Underwriting Operations

Following are the underwriting margins/combined ratios for our underwriting operations for the respective periods:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	Under-writing Margin		Combined Ratio	Under-writing Margin		Combined Ratio	Under-writing Margin		Combined Ratio	Under-writing Margin		Combined Ratio
Personal Lines
Agency	11.2	%	88.8	7.5	%	92.5	12.2	%	87.8	8.5	%	91.5
Direct	9.0		91.0	6.1		93.9	9.4		90.6	6.5		93.5
Total Personal Lines	10.1		89.9	6.8		93.2	10.8		89.2	7.5		92.5
Commercial Lines	11.3		88.7	8.4		91.6	11.5		88.5	9.4		90.6
Property1	(16.6	)	116.6	1.5		98.5	(3.9	)	103.9	2.5		97.5
Total underwriting operations	9.1		90.9	6.8		93.2	10.3		89.7	7.5		92.5

¹ Included in the three and six months ended June 30, 2018 is 5.8 points and 6.0 points, respectively, of amortization expense predominately associated with the acquisition of a controlling interest in ARX and 6.5 points and 6.7 points, respectively, for the three and six months ended June 30, 2017.

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Dividends Dividends (Tables)

6 Months Ended

Jun. 30, 2018

Dividends [Abstract]

Dividends

Following is a summary of our shareholder dividends that were declared in the last two years:

(millions, except per share amounts)			Amount of Common Share Dividends
Dividend Type	Declared	Paid	Per Share		Accrued1		Paid1
Annual – Variable	December 2017	February 2018	$	1.1247	$	655.1	$	654.9
Annual – Variable	December 2016	February 2017	0.6808		395.4		395.4

¹ Variance between accrued and paid, if any, reflects the difference between the number of estimated and actual shares outstanding as of the record date.

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Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Components of Other Comprehensive Income (Loss)

The components of other comprehensive income (loss), including reclassification adjustments by income statement line item, were as follows:

										Components of Changes in Accumulated Other Comprehensive Income (after tax)
(millions)	Pretax total accumulated other comprehensive income			Total tax (provision) benefit			After tax total accumulated other comprehensive income			Total net unrealized gains  (losses) on securities			Net unrealized gains on forecasted transactions			Foreign currency translation adjustment		(Income)loss attributable to NCI
Balance at March 31, 2018	$	(218.6	)	$	46.0		$	(172.6	)	$	(160.8	)	$	(17.8	)	$	0	$	6.0
Other comprehensive income (loss) before reclassifications:
Investment securities	(90.4		)	18.8			(71.6		)	(71.6		)	0			0		0
Forecasted transactions	0			0			0			0			0			0		0
Foreign currency translation adjustment	0			0			0			0			0			0		0
Loss attributable to noncontrolling interest (NCI)	0.7			(0.1		)	0.6			0			0			0		0.6
Total other comprehensive income (loss) before reclassifications	(89.7		)	18.7			(71.0		)	(71.6		)	0			0		0.6
Less: Reclassification adjustment for amounts realized in net income by income statement line item:
Net impairment losses recognized in earnings	0			0			0			0			0			0		0
Net realized gains (losses) on securities	(27.2		)	5.7			(21.5		)	(21.5		)	0			0		0
Interest expense	(0.3		)	0.1			(0.2		)	0			(0.2		)	0		0
Total reclassification adjustment for amounts realized in net income	(27.5		)	5.8			(21.7		)	(21.5		)	(0.2		)	0		0
Total other comprehensive income (loss)	(62.2		)	12.9			(49.3		)	(50.1		)	0.2			0		0.6
Balance at June 30, 2018	$	(280.8	)	$	58.9		$	(221.9	)	$	(210.9	)	$	(17.6	)	$	0	$	6.6

										Components of Changes in Accumulated Other Comprehensive Income (after tax)
(millions)	Pretax total accumulated other comprehensive income			Total tax (provision) benefit			After tax total accumulated other comprehensive income			Total net unrealized gains  (losses) on securities			Net unrealized gains on forecasted transactions			Foreign currency translation adjustment		(Income)loss attributable to NCI
Balance at December 31, 2017	$	1,977.8		$	(695.6	)	$	1,282.2		$	1,295.0		$	(14.8	)	$	0	$	2.0
Cumulative effect adjustment1	(2,006.0		)	705.8			(1,300.2		)	(1,300.2		)	0			0		0
Reclassification of disproportionate tax effect2	0			(4.3		)	(4.3		)	(1.1		)	(3.2		)	0		0
Adjusted balance at December 31, 2017	(28.2		)	5.9			(22.3		)	(6.3		)	(18.0		)	0		2.0
Other comprehensive income (loss) before reclassifications:
Investment securities	(293.8		)	61.6			(232.2		)	(232.2		)	0			0		0
Forecasted transactions	0			0			0			0			0			0		0
Foreign currency translation adjustment	0			0			0			0			0			0		0
Loss attributable to noncontrolling interest (NCI)	5.8			(1.2		)	4.6			0			0			0		4.6
Total other comprehensive income (loss) before reclassifications	(288.0		)	60.4			(227.6		)	(232.2		)	0			0		4.6
Less: Reclassification adjustment for amounts realized in net income by income statement line item:
Net impairment losses recognized in earnings	0			0			0			0			0			0		0
Net realized gains (losses) on securities	(34.9		)	7.3			(27.6		)	(27.6		)	0			0		0
Interest expense	(0.5		)	0.1			(0.4		)	0			(0.4		)	0		0
Total reclassification adjustment for amounts realized in net income	(35.4		)	7.4			(28.0		)	(27.6		)	(0.4		)	0		0
Total other comprehensive income (loss)	(252.6		)	53.0			(199.6		)	(204.6		)	0.4			0		4.6
Balance at June 30, 2018	$	(280.8	)	$	58.9		$	(221.9	)	$	(210.9	)	$	(17.6	)	$	0	$	6.6

¹Reflects the fair value changes on equity securities as of December 31, 2017, which are reported as realized gains (losses) under the new accounting guidance. See Note 14 – New Accounting Standards for additional information.

²Reflects the effect of the change in the U.S. federal tax rate on our available-for-sale fixed maturity securities and our hedges on forecasted transactions as of December 31, 2017. See Note 14 – New Accounting Standards for additional information.

										Components of Changes in Accumulated Other Comprehensive Income (after tax)
(millions)	Pretax total accumulated other comprehensive income			Total tax (provision) benefit			After tax total accumulated other comprehensive income			Total net unrealized gains  (losses) on securities			Net unrealized gains on forecasted transactions			Foreign currency translation adjustment			(Income)loss attributable to NCI
Balance at March 31, 2017	$	1,645.9		$	(578.4	)	$	1,067.5		$	1,072.0		$	(7.1	)	$	(0.8	)	$	3.4
Other comprehensive income (loss) before reclassifications:
Investment securities	177.2			(62.1		)	115.1			115.1			0			0			0
Forecasted transactions	(12.0		)	4.2			(7.8		)	0			(7.8		)	0			0
Foreign currency translation adjustment	(0.2		)	0.1			(0.1		)	0			0			(0.1		)	0
Loss attributable to noncontrolling interest (NCI)	(1.9		)	0.6			(1.3		)	0			0			0			(1.3		)
Total other comprehensive income (loss) before reclassifications	163.1			(57.2		)	105.9			115.1			(7.8		)	(0.1		)	(1.3		)
Less: Reclassification adjustment for amounts realized in net income by income statement line item:
Net impairment losses recognized in earnings	(2.6		)	0.9			(1.7		)	(1.7		)	0			0			0
Net realized gains (losses) on securities	37.2			(13.0		)	24.2			24.2			0			0			0
Interest expense	0.3			(0.1		)	0.2			0			0.2			0			0
Total reclassification adjustment for amounts realized in net income	34.9			(12.2		)	22.7			22.5			0.2			0			0
Total other comprehensive income (loss)	128.2			(45.0		)	83.2			92.6			(8.0		)	(0.1		)	(1.3		)
Balance at June 30, 2017	$	1,774.1		$	(623.4	)	$	1,150.7		$	1,164.6		$	(15.1	)	$	(0.9	)	$	2.1

										Components of Changes in Accumulated Other Comprehensive Income (after tax)
(millions)	Pretax total accumulated other comprehensive income			Total tax (provision) benefit			After tax total accumulated other comprehensive income			Total net unrealized gains  (losses) on securities			Net unrealized gains on forecasted transactions			Foreign currency translation adjustment			(Income)loss attributable to NCI
Balance at December 31, 2016	$	1,439.5		$	(506.1	)	$	933.4		$	939.6		$	(9.4	)	$	(1.1	)	$	4.3
Other comprehensive income (loss) before reclassifications:
Investment securities	431.7			(151.3		)	280.4			280.4			0			0			0
Forecasted transactions	(8.0		)	2.8			(5.2		)	0			(5.2		)	0			0
Foreign currency translation adjustment	0.3			(0.1		)	0.2			0			0			0.2			0
Loss attributable to noncontrolling interest (NCI)	(3.4		)	1.2			(2.2		)	0			0			0			(2.2		)
Total other comprehensive income (loss) before reclassifications	420.6			(147.4		)	273.2			280.4			(5.2		)	0.2			(2.2		)
Less: Reclassification adjustment for amounts realized in net income by income statement line item:
Net impairment losses recognized in earnings	(3.6		)	1.3			(2.3		)	(2.3		)	0			0			0
Net realized gains (losses) on securities	88.8			(31.1		)	57.7			57.7			0			0			0
Interest expense	0.8			(0.3		)	0.5			0			0.5			0			0
Total reclassification adjustment for amounts realized in net income	86.0			(30.1		)	55.9			55.4			0.5			0			0
Total other comprehensive income (loss)	334.6			(117.3		)	217.3			225.0			(5.7		)	0.2			(2.2		)
Balance at June 30, 2017	$	1,774.1		$	(623.4	)	$	1,150.7		$	1,164.6		$	(15.1	)	$	(0.9	)	$	2.1

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Redeemable Noncontrolling Interest (Tables)

6 Months Ended

Jun. 30, 2018

Temporary Equity Disclosure [Abstract]

Redeemable Noncontrolling Interest

The changes in the components of redeemable NCI during the six months endedJune 30, 2018 and 2017, and the year ended December 31, 2017, were:

(millions)	June 30, 2018			June 30, 2017		December 31, 2017
Balance, Beginning of period	$	503.7		$	483.7	$	483.7
Net income attributable to NCI	8.8			11.1		5.9
Other comprehensive income (loss) attributable to NCI	(4.6		)	2.2		2.3
Exercise of employee stock options	9.4			3.4		3.4
Purchase of ARX shares	(295.9		)	0		0
Change in redemption value of NCI	(3.2		)	1.4		8.4
Balance, End of period	$	218.2		$	501.8	$	503.7

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Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Net Carrying Amount of Other Intangible Assets

The following table is a summary of the net carrying amount of other intangible assets as of June 30, 2018 and 2017, and December 31, 2017:

(millions)	June 30, 2018		June 30, 2017		December 31, 2017
Intangible assets subject to amortization	$	318.2	$	389.4	$	354.2
Indefinite-lived intangible assets1	12.4		12.4		12.4
Total	$	330.6	$	401.8	$	366.6

¹ Indefinite-lived intangible assets are comprised of state insurance and agent licenses. State insurance licenses were previously subject to amortization under superseded accounting guidance and have $0.6 million of accumulated amortization for all periods presented.

Intangible Assets Subject to Amortization

Intangible assets subject to amortization consisted of the following:

(millions)	June 30, 2018						June 30, 2017						December 31, 2017
Category	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Policies in force	$	256.2	$	119.0	$	137.2	$	256.2	$	82.4	$	173.8	$	256.2	$	100.7	$	155.5
Agency relationships	159.2		37.0		122.2		159.2		25.6		133.6		159.2		31.3		127.9
Software rights	79.1		34.7		44.4		79.1		24.1		55.0		79.1		29.4		49.7
Trade name	34.8		20.4		14.4		34.8		7.8		27.0		34.8		13.7		21.1
Total	$	529.3	$	211.1	$	318.2	$	529.3	$	139.9	$	389.4	$	529.3	$	175.1	$	354.2

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Basis of Presentation Basis of Presentation-Additional Information (Details)	Jun. 30, 2018 USD ($) shares	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)
Business Acquisition [Line Items]
Assets Held-for-sale, Property, Plant and Equipment | $	$ 17,400,000	$ 5,300,000	$ 0
ARX Holding Corp. [Member]
Business Acquisition [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage	86.70%	69.00%	69.00%
Number of Shares Put Pursuant to Stockholders' Agreement | shares	204,527

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Investments Investment Portfolio by Major Security Type (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Fixed maturities:
Fair Value	$ 27,020.4	$ 23,071.1	$ 22,117.8
Total available-for-sale securities
Cost	27,293.0
Gross Unrealized Gains	36.8
Gross Unrealized Losses	304.1
Net Holding Period Gains (Losses)	(5.3)
Fair Value	$ 27,020.4
% of Total Fair Value	87.40%
Equity securities:
Cost	$ 1,991.0
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Net Holding Period Gains (Losses)	1,909.8
Fair Value	$ 3,900.8	4,203.6	3,860.6
% of Total Fair Value	12.60%
Total portfolio
Cost	$ 29,284.0
Gross Unrealized Gains	36.8
Gross Unrealized Losses	(304.1)
Net Holding Period Gains (Losses)	1,904.5
Fair Value	$ 30,921.2	27,274.7	25,978.4
% of Total Fair Value	100.00%
Available for Sale Securities
Cost		25,276.9	24,179.7
Gross Unrealized Gains		2,097.0	1,857.7
Gross Unrealized Losses		99.4	62.1
Net Holding Period Gains (Losses)		0.2	3.1
Fair Value		$ 27,274.7	$ 25,978.4
% of Total Fair Value		100.00%	100.00%
Unsettled security transactions	$ 362.1		$ 287.1
Unsettled security transactions		$ 5.8
Total fair value of portfolio	1,700.0	1,600.0	1,100.0
Nonredeemable preferred stocks
Equity securities:
Cost	677.0
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Net Holding Period Gains (Losses)	81.6
Fair Value	$ 758.6
% of Total Fair Value	2.40%
Available for Sale Securities
Cost		698.6	666.0
Gross Unrealized Gains		114.0	123.6
Gross Unrealized Losses		8.8	6.5
Net Holding Period Gains (Losses)		0.0	0.0
Fair Value		$ 803.8	$ 783.1
% of Total Fair Value		2.90%	3.00%
Common equities
Equity securities:
Cost	$ 1,314.0
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Net Holding Period Gains (Losses)	1,828.2
Fair Value	$ 3,142.2
% of Total Fair Value	10.20%
Available for Sale Securities
Cost		$ 1,499.0	$ 1,472.3
Gross Unrealized Gains		1,901.0	1,611.7
Gross Unrealized Losses		0.2	6.5
Net Holding Period Gains (Losses)		0.0	0.0
Fair Value		$ 3,399.8	$ 3,077.5
% of Total Fair Value		12.50%	11.80%
Total fixed maturities
Fixed maturities:
Cost	$ 24,061.8
Gross Unrealized Gains	36.8
Gross Unrealized Losses	(304.1)
Net Holding Period Gains (Losses)	(5.3)
Fair Value	$ 23,789.2
% of Total Fair Value	76.90%
Available for Sale Securities
Cost		$ 20,209.9	$ 18,311.7
Gross Unrealized Gains		82.0	122.4
Gross Unrealized Losses		90.4	49.1
Net Holding Period Gains (Losses)		0.2	3.1
Fair Value		$ 20,201.7	$ 18,388.1
% of Total Fair Value		74.10%	70.80%
Total fixed maturities | U.S. government obligations
Fixed maturities:
Cost	$ 8,005.8
Gross Unrealized Gains	0.9
Gross Unrealized Losses	(141.3)
Net Holding Period Gains (Losses)	0.0
Fair Value	$ 7,865.4
% of Total Fair Value	25.40%
Available for Sale Securities
Cost		$ 6,688.8	$ 4,166.4
Gross Unrealized Gains		1.1	4.4
Gross Unrealized Losses		44.0	15.8
Net Holding Period Gains (Losses)		0.0	0.0
Fair Value		$ 6,645.9	$ 4,155.0
% of Total Fair Value		24.40%	16.00%
Total fixed maturities | State and local government obligations
Fixed maturities:
Cost	$ 1,678.9
Gross Unrealized Gains	4.3
Gross Unrealized Losses	(15.9)
Net Holding Period Gains (Losses)	0.0
Fair Value	$ 1,667.3
% of Total Fair Value	5.40%
Available for Sale Securities
Cost		$ 2,285.6	$ 2,473.3
Gross Unrealized Gains		20.7	32.5
Gross Unrealized Losses		9.3	5.9
Net Holding Period Gains (Losses)		0.1	0.2
Fair Value		$ 2,297.1	$ 2,500.1
% of Total Fair Value		8.40%	9.70%
Total fixed maturities | Foreign government obligations
Fixed maturities:
Cost	$ 0.0
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Net Holding Period Gains (Losses)	0.0
Fair Value	$ 0.0
% of Total Fair Value	0.00%
Available for Sale Securities
Cost		$ 0.0	$ 22.5
Gross Unrealized Gains		0.0	0.0
Gross Unrealized Losses		0.0	0.0
Net Holding Period Gains (Losses)		0.0	0.0
Fair Value		$ 0.0	$ 22.5
% of Total Fair Value		0.00%	0.10%
Total fixed maturities | Corporate debt securities
Fixed maturities:
Cost	$ 7,422.4
Gross Unrealized Gains	4.2
Gross Unrealized Losses	(94.3)
Net Holding Period Gains (Losses)	(2.0)
Fair Value	$ 7,330.3
% of Total Fair Value	23.70%
Available for Sale Securities
Cost		$ 4,997.2	$ 4,991.6
Gross Unrealized Gains		14.8	29.4
Gross Unrealized Losses		14.4	7.6
Net Holding Period Gains (Losses)		0.1	0.4
Fair Value		$ 4,997.7	$ 5,013.8
% of Total Fair Value		18.30%	19.30%
Total fixed maturities | Residential mortgage-backed securities
Fixed maturities:
Cost	$ 819.6
Gross Unrealized Gains	8.4
Gross Unrealized Losses	(5.4)
Net Holding Period Gains (Losses)	0.0
Fair Value	$ 822.6
% of Total Fair Value	2.70%
Available for Sale Securities
Cost		$ 828.8	$ 1,260.3
Gross Unrealized Gains		11.3	10.9
Gross Unrealized Losses		3.4	5.9
Net Holding Period Gains (Losses)		0.0	2.3
Fair Value		$ 836.7	$ 1,267.6
% of Total Fair Value		3.10%	4.80%
Total fixed maturities | Commercial mortgage-backed securities
Fixed maturities:
Cost	$ 2,725.5
Gross Unrealized Gains	2.9
Gross Unrealized Losses	(31.5)
Net Holding Period Gains (Losses)	0.0
Fair Value	$ 2,696.9
% of Total Fair Value	8.70%
Available for Sale Securities
Cost		$ 2,760.1	$ 2,364.9
Gross Unrealized Gains		11.8	19.8
Gross Unrealized Losses		13.3	9.7
Net Holding Period Gains (Losses)		0.0	0.0
Fair Value		$ 2,758.6	$ 2,375.0
% of Total Fair Value		10.10%	9.10%
Total fixed maturities | Other asset-backed securities
Fixed maturities:
Cost	$ 3,189.2
Gross Unrealized Gains	2.0
Gross Unrealized Losses	(13.7)
Net Holding Period Gains (Losses)	0.1
Fair Value	$ 3,177.6
% of Total Fair Value	10.30%
Available for Sale Securities
Cost		$ 2,454.5	$ 2,843.3
Gross Unrealized Gains		4.5	6.4
Gross Unrealized Losses		4.5	2.5
Net Holding Period Gains (Losses)		0.2	0.2
Fair Value		$ 2,454.7	$ 2,847.4
% of Total Fair Value		9.00%	11.00%
Total fixed maturities | Redeemable preferred stocks
Fixed maturities:
Cost	$ 220.4
Gross Unrealized Gains	14.1
Gross Unrealized Losses	(2.0)
Net Holding Period Gains (Losses)	(3.4)
Fair Value	$ 229.1
% of Total Fair Value	0.70%
Available for Sale Securities
Cost		$ 194.9	$ 189.4
Gross Unrealized Gains		17.8	19.0
Gross Unrealized Losses		1.5	1.7
Net Holding Period Gains (Losses)		(0.2)	0.0
Fair Value		$ 211.0	$ 206.7
% of Total Fair Value		0.80%	0.80%
Short-term investments
Short-term investments
Cost	$ 3,231.2
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Net Holding Period Gains (Losses)	0.0
Fair Value	$ 3,231.2
% of Total Fair Value	10.50%
Available for Sale Securities
Cost		$ 2,869.4	$ 3,729.7
Gross Unrealized Gains		0.0	0.0
Gross Unrealized Losses		0.0	0.0
Net Holding Period Gains (Losses)		0.0	0.0
Fair Value		$ 2,869.4	$ 3,729.7
% of Total Fair Value		10.50%	14.40%

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Investments Hybrid Securities (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Hybrid Instruments [Line Items]
Hybrid securities	$ 246.7	$ 142.9	$ 265.3
State and local government obligations
Hybrid Instruments [Line Items]
Hybrid securities	3.6	6.1	6.6
Corporate debt securities
Hybrid Instruments [Line Items]
Hybrid securities	170.3	99.8	61.3
Residential mortgage-backed securities
Hybrid Instruments [Line Items]
Hybrid securities	0.0	0.0	189.7
Other asset-backed securities
Hybrid Instruments [Line Items]
Hybrid securities	5.5	6.7	7.7
Redeemable preferred stocks
Hybrid Instruments [Line Items]
Hybrid securities	$ 67.3	$ 30.3	$ 0.0

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Investments Composition of Fixed Maturities by Maturity (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Schedule of Debt Securities by Contractual Maturity [Line Items]
Fixed maturities (amortized cost: $24,061.8, $18,311.7, and $20,209.9)	$ 27,020.4	$ 23,071.1	$ 22,117.8
Total fixed maturities
Schedule of Debt Securities by Contractual Maturity [Line Items]
Less than one year	3,805.2
One to five years	15,190.7
Five to ten years	4,939.7
Ten years or greater	126.2
Cost	24,061.8
Less than one year	3,809.2
One to five years	14,999.1
Five to ten years	4,855.4
Ten years or greater	125.5
Fixed maturities (amortized cost: $24,061.8, $18,311.7, and $20,209.9)	$ 23,789.2

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Investments Gross Unrealized losses by Major Security (Detail) $ in Millions	Jun. 30, 2018 USD ($) security	Dec. 31, 2017 USD ($) security	Jun. 30, 2017 USD ($) security
No. of Sec.
Total | security	1,407
Less than 12 Months | security	860
12 Months or Greater | security	547
Total | security		1,166	944
Less than 12 Months | security		689	696
12 Months or Greater | security		477	248
Fair Value
Total	$ 19,898.7
Less than 12 Months	14,234.4
12 Months or Greater	5,664.3
Total		$ 13,980.2	$ 9,181.8
Less than 12 Months		10,434.6	7,577.9
12 Months or Greater		3,545.6	1,603.9
Unrealized Losses
Total	304.1
Less than 12 Months	181.9
12 Months or Greater	$ 122.2
Total		99.4	62.1
Less than 12 Months		58.3	38.9
12 Months or Greater		$ 41.1	$ 23.2
U.S. government obligations
No. of Sec.
Total | security	70
Less than 12 Months | security	33
12 Months or Greater | security	37
Total | security		58	41
Less than 12 Months | security		41	39
12 Months or Greater | security		17	2
Fair Value
Total	$ 7,503.2
Less than 12 Months	4,543.5
12 Months or Greater	2,959.7
Total		$ 5,817.0	$ 2,781.8
Less than 12 Months		4,869.3	2,725.1
12 Months or Greater		947.7	56.7
Unrealized Losses
Total	141.3
Less than 12 Months	73.6
12 Months or Greater	$ 67.7
Total		44.0	15.8
Less than 12 Months		34.6	15.1
12 Months or Greater		$ 9.4	$ 0.7
State and local government obligations
No. of Sec.
Total | security	355
Less than 12 Months | security	219
12 Months or Greater | security	136
Total | security		358	222
Less than 12 Months | security		230	138
12 Months or Greater | security		128	84
Fair Value
Total	$ 1,050.9
Less than 12 Months	631.9
12 Months or Greater	419.0
Total		$ 1,200.3	$ 818.7
Less than 12 Months		737.6	479.8
12 Months or Greater		462.7	338.9
Unrealized Losses
Total	15.9
Less than 12 Months	7.1
12 Months or Greater	$ 8.8
Total		9.3	5.9
Less than 12 Months		4.4	3.3
12 Months or Greater		$ 4.9	$ 2.6
Corporate debt securities
No. of Sec.
Total | security	391
Less than 12 Months | security	322
12 Months or Greater | security	69
Total | security		222	143
Less than 12 Months | security		171	122
12 Months or Greater | security		51	21
Fair Value
Total	$ 6,153.5
Less than 12 Months	5,439.3
12 Months or Greater	714.2
Total		$ 2,979.4	$ 1,905.2
Less than 12 Months		2,072.9	1,599.6
12 Months or Greater		906.5	305.6
Unrealized Losses
Total	94.3
Less than 12 Months	77.2
12 Months or Greater	$ 17.1
Total		14.4	7.6
Less than 12 Months		9.1	5.3
12 Months or Greater		$ 5.3	$ 2.3
Residential mortgage-backed securities
No. of Sec.
Total | security	227
Less than 12 Months | security	52
12 Months or Greater | security	175
Total | security		201	220
Less than 12 Months | security		30	126
12 Months or Greater | security		171	94
Fair Value
Total	$ 380.3
Less than 12 Months	188.6
12 Months or Greater	191.7
Total		$ 300.9	$ 535.7
Less than 12 Months		75.1	197.8
12 Months or Greater		225.8	337.9
Unrealized Losses
Total	5.4
Less than 12 Months	0.9
12 Months or Greater	$ 4.5
Total		3.4	5.9
Less than 12 Months		0.2	1.1
12 Months or Greater		$ 3.2	$ 4.8
Commercial mortgage-backed securities
No. of Sec.
Total | security	142
Less than 12 Months | security	85
12 Months or Greater | security	57
Total | security		105	74
Less than 12 Months | security		63	52
12 Months or Greater | security		42	22
Fair Value
Total	$ 2,300.9
Less than 12 Months	1,371.4
12 Months or Greater	929.5
Total		$ 1,682.3	$ 905.6
Less than 12 Months		1,221.2	679.5
12 Months or Greater		461.1	226.1
Unrealized Losses
Total	31.5
Less than 12 Months	14.4
12 Months or Greater	$ 17.1
Total		13.3	9.7
Less than 12 Months		5.9	5.7
12 Months or Greater		$ 7.4	$ 4.0
Other asset-backed securities
No. of Sec.
Total | security	219
Less than 12 Months | security	148
12 Months or Greater | security	71
Total | security		197	160
Less than 12 Months | security		134	145
12 Months or Greater | security		63	15
Fair Value
Total	$ 2,479.7
Less than 12 Months	2,055.1
12 Months or Greater	424.6
Total		$ 1,837.3	$ 2,077.8
Less than 12 Months		1,377.8	1,823.8
12 Months or Greater		459.5	254.0
Unrealized Losses
Total	13.7
Less than 12 Months	8.5
12 Months or Greater	$ 5.2
Total		4.5	2.5
Less than 12 Months		3.3	1.9
12 Months or Greater		$ 1.2	$ 0.6
Redeemable preferred stocks
No. of Sec.
Total | security	3
Less than 12 Months | security	1
12 Months or Greater | security	2
Total | security		2	1
Less than 12 Months | security		1	0
12 Months or Greater | security		1	1
Fair Value
Total	$ 30.2
Less than 12 Months	4.6
12 Months or Greater	25.6
Total		$ 21.8	$ 10.8
Less than 12 Months		10.8	0.0
12 Months or Greater		11.0	10.8
Unrealized Losses
Total	2.0
Less than 12 Months	0.2
12 Months or Greater	$ 1.8
Total		1.5	1.7
Less than 12 Months		0.1	0.0
12 Months or Greater		$ 1.4	$ 1.7
Total fixed maturities
No. of Sec.
Total | security		1,143	861
Less than 12 Months | security		670	622
12 Months or Greater | security		473	239
Fair Value
Total		$ 13,839.0	$ 9,035.6
Less than 12 Months		10,364.7	7,505.6
12 Months or Greater		3,474.3	1,530.0
Unrealized Losses
Total		90.4	49.1
Less than 12 Months		57.6	32.4
12 Months or Greater		$ 32.8	$ 16.7
Nonredeemable preferred stocks
No. of Sec.
Total | security		4	3
Less than 12 Months | security		1	0
12 Months or Greater | security		3	3
Fair Value
Total		$ 127.8	$ 73.1
Less than 12 Months		56.5	0.0
12 Months or Greater		71.3	73.1
Unrealized Losses
Total		8.8	6.5
Less than 12 Months		0.5	0.0
12 Months or Greater		$ 8.3	$ 6.5
Common equities
No. of Sec.
Total | security		19	80
Less than 12 Months | security		18	74
12 Months or Greater | security		1	6
Fair Value
Total		$ 13.4	$ 73.1
Less than 12 Months		13.4	72.3
12 Months or Greater		0.0	0.8
Unrealized Losses
Total		0.2	6.5
Less than 12 Months		0.2	6.5
12 Months or Greater		$ 0.0	$ 0.0
Total equity securities
No. of Sec.
Total | security		23	83
Less than 12 Months | security		19	74
12 Months or Greater | security		4	9
Fair Value
Total		$ 141.2	$ 146.2
Less than 12 Months		69.9	72.3
12 Months or Greater		71.3	73.9
Unrealized Losses
Total		9.0	13.0
Less than 12 Months		0.7	6.5
12 Months or Greater		$ 8.3	$ 6.5

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Investments Total Non-Credit Portion of Other-Than-Temporary Impairment Recorded in Accumulated Other Comprehensive Income, Reflecting Original Non-Credit Loss at Time Credit Impairment (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Other Than Temporary Impairment Non Credit Losses Recognized In Accumulated Other Comprehensive Income [Line Items]
Non-credit portion of other-than-temporary impairments recognized in accumulated other comprehensive income	$ (20.0)	$ (20.0)	$ (20.2)
Residential mortgage-backed securities
Other Than Temporary Impairment Non Credit Losses Recognized In Accumulated Other Comprehensive Income [Line Items]
Non-credit portion of other-than-temporary impairments recognized in accumulated other comprehensive income	(19.7)	(19.7)	(19.7)
Commercial mortgage-backed securities
Other Than Temporary Impairment Non Credit Losses Recognized In Accumulated Other Comprehensive Income [Line Items]
Non-credit portion of other-than-temporary impairments recognized in accumulated other comprehensive income	$ (0.3)	$ (0.3)	$ (0.5)

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Investments OTTI Credit Losses Recognized in Earnings (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning balance	$ 0.5	$ 11.5	$ 0.5	$ 11.5
Reductions for securities sold/matured	0.0	(11.4)	0.0	(11.2)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Changes in Cash Flows	0.3	0.2	0.3	0.0
Ending balance	0.8	0.3	0.8	0.3
Residential mortgage-backed securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning balance	0.0	11.4	0.0	11.1
Reductions for securities sold/matured	0.0	(11.4)	0.0	(10.9)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Changes in Cash Flows	0.3	0.2	0.3	0.0
Ending balance	0.3	0.2	0.3	0.2
Commercial mortgage-backed securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning balance	0.5	0.1	0.5	0.4
Reductions for securities sold/matured	0.0	0.0	0.0	(0.3)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Changes in Cash Flows	0.0	0.0	0.0	0.0
Ending balance	$ 0.5	$ 0.1	$ 0.5	$ 0.1

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Investments Components of Net Realized Gains (Losses) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Gain (Loss) on Securities [Line Items]
Gross realized gains on security sales		$ 52.6		$ 112.3
Gross realized gains on security sales	$ 24.7		$ 159.7
Gross realized losses on security sales		(7.9)		(15.8)
Gross realized losses on security sales	34.3		62.3
Net realized gains (losses) on security sales, equity securities	16.6		131.8
Litigation settlements and other gains (losses)	0.0	0.8	0.0	1.1
Subtotal net realized gains (losses) on security sales	(9.6)	45.5	97.4	97.6
Net holding period gains (losses), hybrid securities	(2.3)	0.4	(5.5)	1.2
Net holding period gains (losses), equity securities	55.8		(96.2)
Subtotal net holding period gains (losses)	53.5	0.4	(101.7)	1.2
Total net realized gains (losses) on securities, equity securities	0.0	(2.6)	0.0	(3.6)
Other asset impairment	(11.1)	(13.8)	(11.1)	(14.8)
Total net realized gains (losses) on securities	32.8	32.1	(15.4)	84.0
U.S. government obligations
Gain (Loss) on Securities [Line Items]
Gross realized gains on security sales, available for sale securities	1.7		1.7
Gross realized gains on security sales		4.5		4.9
Gross realized losses on security sales, available for sale securities	(29.9)		(38.8)
Gross realized losses on security sales		(0.4)		(3.6)
Net realized gains (losses) on security sales, available for sale securities	(28.2)		(37.1)
Net realized gains (losses) on security sales		4.1		1.3
State and local government obligations
Gain (Loss) on Securities [Line Items]
Gross realized gains on security sales, available for sale securities	0.6		9.2
Gross realized gains on security sales		2.6		3.1
Gross realized losses on security sales, available for sale securities	(0.6)		(1.9)
Gross realized losses on security sales		0.0		(0.1)
Net realized gains (losses) on security sales, available for sale securities	0.0		7.3
Net realized gains (losses) on security sales		2.6		3.0
Corporate debt securities
Gain (Loss) on Securities [Line Items]
Gross realized gains on security sales, available for sale securities	0.3		0.4
Gross realized gains on security sales		7.3		11.4
Gross realized losses on security sales, available for sale securities	(1.0)		(4.1)
Gross realized losses on security sales		(1.9)		(2.8)
Net realized gains (losses) on security sales, available for sale securities	(0.7)		(3.7)
Net realized gains (losses) on security sales		5.4		8.6
Residential mortgage-backed securities
Gain (Loss) on Securities [Line Items]
Gross realized gains on security sales, available for sale securities	0.0		0.0
Gross realized gains on security sales		20.9		21.0
Gross realized losses on security sales, available for sale securities	0.0		0.0
Gross realized losses on security sales		(0.3)		(0.3)
Net realized gains (losses) on security sales, available for sale securities	0.0		0.0
Net realized gains (losses) on security sales		20.6		20.7
Commercial mortgage-backed securities
Gain (Loss) on Securities [Line Items]
Gross realized gains on security sales, available for sale securities	0.3		2.0
Gross realized gains on security sales		1.2		2.4
Gross realized losses on security sales, available for sale securities	0.0		(6.3)
Gross realized losses on security sales		(0.7)		(3.1)
Net realized gains (losses) on security sales, available for sale securities	0.3		(4.3)
Net realized gains (losses) on security sales		0.5		(0.7)
Other asset-backed securities
Gain (Loss) on Securities [Line Items]
Gross realized gains on security sales, available for sale securities	0.1		0.1
Gross realized gains on security sales		0.0		0.3
Gross realized losses on security sales, available for sale securities	(0.9)		(1.0)
Gross realized losses on security sales		0.0		0.0
Net realized gains (losses) on security sales, available for sale securities	(0.8)		(0.9)
Net realized gains (losses) on security sales		0.0		0.3
Redeemable preferred stocks
Gain (Loss) on Securities [Line Items]
Gross realized gains on security sales, available for sale securities	3.2		4.3
Gross realized gains on security sales		0.0		0.3
Net realized gains (losses) on security sales, available for sale securities	3.2		4.3
Net realized gains (losses) on security sales		0.0		0.3
Total fixed maturities
Gain (Loss) on Securities [Line Items]
Gross realized gains on security sales, equity securities	18.5		142.0
Gross realized gains on security sales		16.1		68.9
Gross realized losses on security sales, available for sale securities	(32.4)		(52.1)
Gross realized losses on security sales		(3.3)		(9.9)
Net realized gains (losses) on security sales, available for sale securities	(26.2)		(34.4)
Net realized gains (losses) on security sales		33.2		33.5
Nonredeemable preferred stocks
Gain (Loss) on Securities [Line Items]
Gross realized gains on security sales, equity securities	0.0		3.6
Gross realized gains on security sales		6.2		51.6
Gross realized losses on security sales, equity securities	(1.9)		(2.3)
Gross realized losses on security sales		(4.6)		(5.8)
Net realized gains (losses) on security sales, equity securities	(1.9)		1.3
Net realized gains (losses) on security sales		1.6		45.8
Common equities
Gain (Loss) on Securities [Line Items]
Gross realized gains on security sales, equity securities	18.5		138.4
Gross realized gains on security sales		9.9		17.3
Gross realized losses on security sales, equity securities	0.0		(7.9)
Gross realized losses on security sales		0.0		(0.1)
Net realized gains (losses) on security sales, equity securities	18.5		130.5
Net realized gains (losses) on security sales		9.9		17.2
Total net realized gains (losses) on securities, equity securities	0.0	(2.6)	0.0	(3.6)
Total equity securities
Gain (Loss) on Securities [Line Items]
Gross realized gains on security sales, available for sale securities	6.2		17.7
Gross realized gains on security sales		36.5		43.4
Gross realized losses on security sales, equity securities	(1.9)		(10.2)
Gross realized losses on security sales		(4.6)		(5.9)
Net realized gains (losses) on security sales, equity securities	16.6		131.8
Net realized gains (losses) on security sales		11.5		63.0
Other Assets [Member]
Gain (Loss) on Securities [Line Items]
Other asset impairment	$ (11.1)	$ (11.2)	$ (11.1)	$ (11.2)

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Investments Components of Equity Realized Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Components of Equity Realized Gains (Losses) [Line Items]
Realized Investment Gains (Losses)	$ 72.4	$ 35.6
Net realized gains (losses) on security sales, equity securities	16.6	131.8
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 55.8	$ (96.2)

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Investments Components of Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net Investment Income [Line Items]
Gross investment income	$ 192.1	$ 138.8	$ 358.4	$ 268.0
Investment expenses	(6.2)	(6.6)	(12.2)	(12.2)
Net Investment Income	185.9	132.2	346.2	255.8
Total equity securities
Net Investment Income [Line Items]
Gross investment income	24.6	25.2	50.5	50.0
Total equity securities | Nonredeemable preferred stocks
Net Investment Income [Line Items]
Gross investment income	10.4	10.6	21.3	22.1
Total equity securities | Common equities
Net Investment Income [Line Items]
Gross investment income	14.2	14.6	29.2	27.9
Available-for-sale Securities
Net Investment Income [Line Items]
Gross investment income	167.5	113.6	307.9	218.0
Short-term investments
Net Investment Income [Line Items]
Gross investment income	14.9	8.8	25.0	15.8
Total fixed maturities
Net Investment Income [Line Items]
Gross investment income	152.6	104.8	282.9	202.2
Total fixed maturities | U.S. government obligations
Net Investment Income [Line Items]
Gross investment income	45.9	17.0	85.7	29.7
Total fixed maturities | State and local government obligations
Net Investment Income [Line Items]
Gross investment income	9.1	13.1	19.1	26.4
Total fixed maturities | Foreign government obligations
Net Investment Income [Line Items]
Gross investment income	0.0	0.1	0.0	0.2
Total fixed maturities | Corporate debt securities
Net Investment Income [Line Items]
Gross investment income	51.8	31.3	88.0	60.9
Total fixed maturities | Residential mortgage-backed securities
Net Investment Income [Line Items]
Gross investment income	6.6	10.3	13.5	19.9
Total fixed maturities | Commercial mortgage-backed securities
Net Investment Income [Line Items]
Gross investment income	20.2	18.3	41.4	37.1
Total fixed maturities | Other asset-backed securities
Net Investment Income [Line Items]
Gross investment income	16.1	11.8	29.7	21.7
Total fixed maturities | Redeemable preferred stocks
Net Investment Income [Line Items]
Gross investment income	$ 2.9	$ 2.9	$ 5.5	$ 6.3

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Investments - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 03, 2017	Apr. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Securities Sold under Agreements to Repurchase			$ 0	$ 0	$ 0	$ 0		$ 0
Open reverse repurchase commitments			0	0	0	0		0
Gross unrealized losses			304,100,000		304,100,000
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment					$ 0	$ 0
Investment Portfolio Duration					2 years 7 months 10 days	2 years 3 months 20 days
Trading securities			0	0	$ 0	$ 0		0
Debt and Equity Securities, Gain (Loss)			0	0	0	0
Derivative Assets (Liabilities), at Fair Value, Net			$ 0	$ 0	$ 0	$ 0		$ 0
4.20% Senior Notes due 2048
Schedule of Investments [Line Items]
Debt, face amount							$ 600,000,000
Debt, stated interest rate			4.20%		4.20%		4.20%
4.125% Senior Notes due 2047
Schedule of Investments [Line Items]
Debt, face amount	$ 850,000,000	$ 850,000,000
Debt, stated interest rate	4.125%	4.125%	4.125%		4.125%
Unrealized gain (loss) on interest rate cash flow hedges	$ (8,000,000)	$ (8,000,000)
Series B Preferred Stock [Member]
Schedule of Investments [Line Items]
Preferred Stock, Value, Issued							$ 500,000,000

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Fair Value Composition of Investment Portfolio by Major Security Type (Detail) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 30,921,200,000	$ 27,274,700,000	$ 25,978,400,000
Fair Value	3,959,000,000	3,643,600,000	3,679,200,000
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	14,049,000,000	11,950,400,000	9,788,000,000
Fair Value	0	0	0
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	16,866,900,000	15,319,000,000	16,190,100,000
Fair Value	3,959,000,000	3,606,500,000	3,564,400,000
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	5,300,000	5,300,000	300,000
Fair Value	0	37,100,000	114,800,000
Total Fixed Maturities And Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		24,405,300,000	22,248,700,000
Total Fixed Maturities And Equity Securities [Member] | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		10,126,000,000	7,340,000,000
Total Fixed Maturities And Equity Securities [Member] | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		14,274,000,000	14,908,400,000
Total Fixed Maturities And Equity Securities [Member] | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		5,300,000	300,000
Available-for-sale Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	27,020,400,000
Available-for-sale Securities | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	10,829,700,000
Available-for-sale Securities | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	16,190,700,000
Available-for-sale Securities | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0
Total equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	3,900,800,000
Total equity securities | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	3,219,300,000
Total equity securities | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	676,200,000
Total equity securities | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	5,300,000
Total equity securities | Nonredeemable preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	758,600,000	803,800,000	783,100,000
Total equity securities | Nonredeemable preferred stocks | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	77,400,000	80,600,000	85,300,000
Total equity securities | Nonredeemable preferred stocks | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	676,200,000	718,200,000	697,800,000
Total equity securities | Nonredeemable preferred stocks | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	5,000,000	5,000,000	0
Total equity securities | Nonredeemable preferred stocks | Financials
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	753,600,000	798,800,000	783,100,000
Total equity securities | Nonredeemable preferred stocks | Financials | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	77,400,000	80,600,000	85,300,000
Total equity securities | Nonredeemable preferred stocks | Financials | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	676,200,000	718,200,000	697,800,000
Total equity securities | Nonredeemable preferred stocks | Financials | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total equity securities | Nonredeemable preferred stocks | Industrials
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	5,000,000	5,000,000	0
Total equity securities | Nonredeemable preferred stocks | Industrials | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total equity securities | Nonredeemable preferred stocks | Industrials | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total equity securities | Nonredeemable preferred stocks | Industrials | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	5,000,000	5,000,000	0
Total equity securities | Common equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	3,142,200,000	3,399,800,000	3,077,500,000
Total equity securities | Common equities | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	3,141,900,000	3,399,500,000	3,077,200,000
Total equity securities | Common equities | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total equity securities | Common equities | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	300,000	300,000	300,000
Total equity securities | Common equities | Common equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	3,141,900,000	3,399,500,000	3,077,200,000
Total equity securities | Common equities | Common equities | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	3,141,900,000	3,399,500,000	3,077,200,000
Total equity securities | Common equities | Common equities | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total equity securities | Common equities | Common equities | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total equity securities | Common equities | Other risk investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	300,000	300,000	300,000
Total equity securities | Common equities | Other risk investments | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total equity securities | Common equities | Other risk investments | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total equity securities | Common equities | Other risk investments | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	300,000	300,000	300,000
Carrying (Reported) Amount, Fair Value Disclosure
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	29,284,000,000	25,276,900,000	24,179,700,000
Long-term Debt	3,859,500,000	3,306,300,000	3,383,400,000
Carrying (Reported) Amount, Fair Value Disclosure | Total Fixed Maturities And Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		22,407,500,000	20,450,000,000
Carrying (Reported) Amount, Fair Value Disclosure | Available-for-sale Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	27,293,000,000
Carrying (Reported) Amount, Fair Value Disclosure | Total equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,991,000,000
Carrying (Reported) Amount, Fair Value Disclosure | Total equity securities | Nonredeemable preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	677,000,000	698,600,000	666,000,000
Carrying (Reported) Amount, Fair Value Disclosure | Total equity securities | Nonredeemable preferred stocks | Financials
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	672,000,000	693,600,000	666,000,000
Carrying (Reported) Amount, Fair Value Disclosure | Total equity securities | Nonredeemable preferred stocks | Industrials
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	5,000,000	5,000,000	0
Carrying (Reported) Amount, Fair Value Disclosure | Total equity securities | Common equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,314,000,000	1,499,000,000	1,472,300,000
Carrying (Reported) Amount, Fair Value Disclosure | Total equity securities | Common equities | Common equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,313,700,000	1,498,700,000	1,472,000,000
Carrying (Reported) Amount, Fair Value Disclosure | Total equity securities | Common equities | Other risk investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	300,000	300,000	300,000
Total fixed maturities | Available-for-sale Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	23,789,200,000	20,201,700,000	18,388,100,000
Total fixed maturities | Available-for-sale Securities | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	7,875,500,000	6,645,900,000	4,177,500,000
Total fixed maturities | Available-for-sale Securities | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	15,913,700,000	13,555,800,000	14,210,600,000
Total fixed maturities | Available-for-sale Securities | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	16,863,000,000	13,940,700,000	11,691,400,000
Total fixed maturities | Available-for-sale Securities | Debt Securities [Member] | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	7,865,400,000	6,645,900,000	4,177,500,000
Total fixed maturities | Available-for-sale Securities | Debt Securities [Member] | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	8,997,600,000	7,294,800,000	7,513,900,000
Total fixed maturities | Available-for-sale Securities | Debt Securities [Member] | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	6,697,100,000	6,050,000,000	6,490,000,000
Total fixed maturities | Available-for-sale Securities | Asset-backed Securities | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Asset-backed Securities | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	6,697,100,000	6,050,000,000	6,490,000,000
Total fixed maturities | Available-for-sale Securities | Asset-backed Securities | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | U.S. government obligations | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	7,865,400,000	6,645,900,000	4,155,000,000
Total fixed maturities | Available-for-sale Securities | U.S. government obligations | Debt Securities [Member] | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	7,865,400,000	6,645,900,000	4,155,000,000
Total fixed maturities | Available-for-sale Securities | U.S. government obligations | Debt Securities [Member] | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | U.S. government obligations | Debt Securities [Member] | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | State and local government obligations | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,667,300,000	2,297,100,000	2,500,100,000
Total fixed maturities | Available-for-sale Securities | State and local government obligations | Debt Securities [Member] | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | State and local government obligations | Debt Securities [Member] | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,667,300,000	2,297,100,000	2,500,100,000
Total fixed maturities | Available-for-sale Securities | State and local government obligations | Debt Securities [Member] | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Foreign government obligations | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	22,500,000
Total fixed maturities | Available-for-sale Securities | Foreign government obligations | Debt Securities [Member] | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	22,500,000
Total fixed maturities | Available-for-sale Securities | Foreign government obligations | Debt Securities [Member] | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Foreign government obligations | Debt Securities [Member] | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Corporate debt securities | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	7,330,300,000	4,997,700,000	5,013,800,000
Total fixed maturities | Available-for-sale Securities | Corporate debt securities | Debt Securities [Member] | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Corporate debt securities | Debt Securities [Member] | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	7,330,300,000	4,997,700,000	5,013,800,000
Total fixed maturities | Available-for-sale Securities | Corporate debt securities | Debt Securities [Member] | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Residential mortgage-backed securities | Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	822,600,000	836,700,000	1,267,600,000
Total fixed maturities | Available-for-sale Securities | Residential mortgage-backed securities | Asset-backed Securities | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Residential mortgage-backed securities | Asset-backed Securities | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	822,600,000	836,700,000	1,267,600,000
Total fixed maturities | Available-for-sale Securities | Residential mortgage-backed securities | Asset-backed Securities | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Commercial mortgage-backed securities | Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	2,696,900,000	2,758,600,000	2,375,000,000
Total fixed maturities | Available-for-sale Securities | Commercial mortgage-backed securities | Asset-backed Securities | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Commercial mortgage-backed securities | Asset-backed Securities | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	2,696,900,000	2,758,600,000	2,375,000,000
Total fixed maturities | Available-for-sale Securities | Commercial mortgage-backed securities | Asset-backed Securities | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Other asset-backed securities | Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	3,177,600,000	2,454,700,000	2,847,400,000
Total fixed maturities | Available-for-sale Securities | Other asset-backed securities | Asset-backed Securities | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Other asset-backed securities | Asset-backed Securities | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	3,177,600,000	2,454,700,000	2,847,400,000
Total fixed maturities | Available-for-sale Securities | Other asset-backed securities | Asset-backed Securities | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Redeemable preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	229,100,000	211,000,000	206,700,000
Total fixed maturities | Available-for-sale Securities | Redeemable preferred stocks | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	10,100,000	0	0
Total fixed maturities | Available-for-sale Securities | Redeemable preferred stocks | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	219,000,000	211,000,000	206,700,000
Total fixed maturities | Available-for-sale Securities | Redeemable preferred stocks | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Redeemable preferred stocks | Financials
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	67,700,000	64,100,000	64,100,000
Total fixed maturities | Available-for-sale Securities | Redeemable preferred stocks | Financials | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Redeemable preferred stocks | Financials | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	67,700,000	64,100,000	64,100,000
Total fixed maturities | Available-for-sale Securities | Redeemable preferred stocks | Financials | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Redeemable preferred stocks | Public Utility, Equities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	4,600,000	11,400,000	32,200,000
Total fixed maturities | Available-for-sale Securities | Redeemable preferred stocks | Public Utility, Equities [Member] | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Redeemable preferred stocks | Public Utility, Equities [Member] | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	4,600,000	11,400,000	32,200,000
Total fixed maturities | Available-for-sale Securities | Redeemable preferred stocks | Public Utility, Equities [Member] | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Available-for-sale Securities | Redeemable preferred stocks | Industrials
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	156,800,000	135,500,000	110,400,000
Total fixed maturities | Available-for-sale Securities | Redeemable preferred stocks | Industrials | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	10,100,000	0	0
Total fixed maturities | Available-for-sale Securities | Redeemable preferred stocks | Industrials | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	146,700,000	135,500,000	110,400,000
Total fixed maturities | Available-for-sale Securities | Redeemable preferred stocks | Industrials | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Total fixed maturities | Carrying (Reported) Amount, Fair Value Disclosure | Available-for-sale Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	24,061,800,000	20,209,900,000	18,311,700,000
Total fixed maturities | Carrying (Reported) Amount, Fair Value Disclosure | Available-for-sale Securities | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	17,107,100,000	13,971,600,000	11,653,800,000
Total fixed maturities | Carrying (Reported) Amount, Fair Value Disclosure | Available-for-sale Securities | Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	6,734,300,000	6,043,400,000	6,468,500,000
Total fixed maturities | Carrying (Reported) Amount, Fair Value Disclosure | Available-for-sale Securities | U.S. government obligations | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	8,005,800,000	6,688,800,000	4,166,400,000
Total fixed maturities | Carrying (Reported) Amount, Fair Value Disclosure | Available-for-sale Securities | State and local government obligations | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	1,678,900,000	2,285,600,000	2,473,300,000
Total fixed maturities | Carrying (Reported) Amount, Fair Value Disclosure | Available-for-sale Securities | Foreign government obligations | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	22,500,000
Total fixed maturities | Carrying (Reported) Amount, Fair Value Disclosure | Available-for-sale Securities | Corporate debt securities | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	7,422,400,000	4,997,200,000	4,991,600,000
Total fixed maturities | Carrying (Reported) Amount, Fair Value Disclosure | Available-for-sale Securities | Residential mortgage-backed securities | Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	819,600,000	828,800,000	1,260,300,000
Total fixed maturities | Carrying (Reported) Amount, Fair Value Disclosure | Available-for-sale Securities | Commercial mortgage-backed securities | Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	2,725,500,000	2,760,100,000	2,364,900,000
Total fixed maturities | Carrying (Reported) Amount, Fair Value Disclosure | Available-for-sale Securities | Other asset-backed securities | Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	3,189,200,000	2,454,500,000	2,843,300,000
Total fixed maturities | Carrying (Reported) Amount, Fair Value Disclosure | Available-for-sale Securities | Redeemable preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	220,400,000	194,900,000	189,400,000
Total fixed maturities | Carrying (Reported) Amount, Fair Value Disclosure | Available-for-sale Securities | Redeemable preferred stocks | Financials
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	65,300,000	61,300,000	60,400,000
Total fixed maturities | Carrying (Reported) Amount, Fair Value Disclosure | Available-for-sale Securities | Redeemable preferred stocks | Public Utility, Equities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	4,800,000	10,100,000	30,500,000
Total fixed maturities | Carrying (Reported) Amount, Fair Value Disclosure | Available-for-sale Securities | Redeemable preferred stocks | Industrials
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	150,300,000	123,500,000	98,500,000
Short-term investments | Available-for-sale Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	3,231,200,000	2,869,400,000	3,729,700,000
Short-term investments | Available-for-sale Securities | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	2,954,200,000	1,824,400,000	2,448,000,000
Short-term investments | Available-for-sale Securities | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	277,000,000	1,045,000,000	1,281,700,000
Short-term investments | Available-for-sale Securities | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
Short-term investments | Carrying (Reported) Amount, Fair Value Disclosure | Available-for-sale Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 3,231,200,000	$ 2,869,400,000	$ 3,729,700,000

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Fair Value Fair Value - Additional Information (Detail)	Jun. 30, 2018 USD ($) security	Dec. 31, 2017 USD ($) security	Jun. 30, 2017 USD ($)
Fair Value Measurements [Line Items]
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	$ 0	$ 0	$ 0
Fair Value	$ 30,921,200,000	$ 27,274,700,000	$ 25,978,400,000
Fair Value, Inputs, Level 1
Fair Value Measurements [Line Items]
Vendor Quoted Prices, Percent of FV Hierarchy Level	72.00%	66.00%	58.00%
Fair Value	$ 14,049,000,000	$ 11,950,400,000	$ 9,788,000,000
Fair Value, Inputs, Level 2
Fair Value Measurements [Line Items]
Vendor Quoted Prices, Percent of FV Hierarchy Level	98.00%	98.00%	99.00%
Dealer Quoted Prices, Percent of FV Hierarchy Level	2.00%	2.00%	1.00%
Fair Value	$ 16,866,900,000	$ 15,319,000,000	$ 16,190,100,000
Fair Value, Inputs, Level 3
Fair Value Measurements [Line Items]
Fair Value	5,300,000	5,300,000	$ 300,000
Available-for-sale Securities
Fair Value Measurements [Line Items]
Fair Value	27,020,400,000
Available-for-sale Securities | Fair Value, Inputs, Level 1
Fair Value Measurements [Line Items]
Fair Value	10,829,700,000
Available-for-sale Securities | Fair Value, Inputs, Level 2
Fair Value Measurements [Line Items]
Fair Value	16,190,700,000
Available-for-sale Securities | Fair Value, Inputs, Level 3
Fair Value Measurements [Line Items]
Fair Value	0
Nonredeemable preferred stocks | Internal Pricing | Fair Value, Inputs, Level 3
Fair Value Measurements [Line Items]
Fair Value	$ 5,000,000	$ 5,000,000
Number of securities	1	1	0

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Debt (Detail) - USD ($) $ in Millions		Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Debt Instrument [Line Items]
Fair Value		$ 3,959.0	$ 3,643.6	$ 3,679.2
Debt, Long-term and Short-term, Combined Amount	[1]	3,859.5	3,306.3	3,383.4
3.75% Senior Notes due 2021
Debt Instrument [Line Items]
Long-term Debt		498.9	498.8	498.6
Fair Value		506.4	520.7	528.0
2.45% Senior Notes due 2027
Debt Instrument [Line Items]
Long-term Debt		496.3	496.1	496.0
Fair Value		451.3	477.9	474.2
6 5/8% Senior Notes due 2029
Debt Instrument [Line Items]
Long-term Debt		296.2	296.1	296.0
Fair Value		364.4	382.3	389.0
6.25% Senior Notes due 2032
Debt Instrument [Line Items]
Long-term Debt		395.4	395.3	395.2
Fair Value		492.5	516.9	522.7
4.35% Senior Notes due 2044
Debt Instrument [Line Items]
Long-term Debt		346.6	346.5	346.5
Fair Value		356.7	388.7	376.5
3.70% Senior Notes due 2045
Debt Instrument [Line Items]
Long-term Debt		395.3	395.2	395.2
Fair Value		363.9	402.9	389.7
4.125% Senior Notes due 2047
Debt Instrument [Line Items]
Long-term Debt		841.3	841.2	841.1
Fair Value		831.5	917.1	884.3
4.20% Senior Notes due 2048
Debt Instrument [Line Items]
Long-term Debt		589.5	0.0	0.0
Fair Value		592.3	0.0	0.0
Other debt instruments
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount		$ 0.0	$ 37.1	$ 114.8

[1] Consists of long-term debt. See Note 4 – Debt for further discussion.

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Debt - Additional Information (Detail) - USD ($)		1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 03, 2017	Mar. 31, 2018	Apr. 30, 2017	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Repayments of Debt						$ 37,100,000	$ 12,500,000
Repayment of debt						0	$ 594,400,000
Discretionary Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 250,000,000
Debt term						30 days
Borrowings outstanding						$ 0		$ 0
3.75% Senior Notes due 2021
Debt Instrument [Line Items]
Debt, stated interest rate						3.75%
2.45% Senior Notes due 2027
Debt Instrument [Line Items]
Debt, stated interest rate						2.45%
6 5/8% Senior Notes due 2029
Debt Instrument [Line Items]
Debt, stated interest rate						6.625%
6.25% Senior Notes due 2032
Debt Instrument [Line Items]
Debt, stated interest rate						6.25%
4.35% Senior Notes due 2044
Debt Instrument [Line Items]
Debt, stated interest rate						4.35%
3.70% Senior Notes due 2045
Debt Instrument [Line Items]
Debt, stated interest rate						3.70%
4.125% Senior Notes due 2047
Debt Instrument [Line Items]
Debt, face amount	$ 850,000,000		$ 850,000,000
Debt, stated interest rate	4.125%		4.125%			4.125%
Proceeds, net of underwriter's discounts and commissions			$ 841,100,000
Unrealized gain (loss) on interest rate cash flow hedges	$ (8,000,000)		$ (8,000,000)
4.20% Senior Notes due 2048
Debt Instrument [Line Items]
Debt, face amount		$ 600,000,000		$ 600,000,000
Debt, stated interest rate		4.20%		4.20%		4.20%
Proceeds, net of underwriter's discounts and commissions		$ 589,500,000
Federal Funds Open Rate | Discretionary Line of Credit
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate						0.50%
Notes Payable, Other Payables | Other debt instruments
Debt Instrument [Line Items]
Repayments of Debt				$ 37,100,000
Trust Preferred Debt Securities [Member] | Other debt instruments
Debt Instrument [Line Items]
Repayments of Debt					$ 65,200,000

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Income Taxes Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Valuation allowance	$ 0	$ 0	$ 0	$ 0	$ 0
Effective Income Tax Rate Reconciliation, Percent	20.30%	32.80%	20.10%	32.90%

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Loss and Loss Adjustment Expense Reserves (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Loss and loss adjustment expense reserves	$ 14,070.8	$ 12,060.4	$ 13,086.9	$ 11,368.0
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments and Liability for Unpaid Claims and Claim Adjustment Expense, Other Reconciling Item	2,293.1	1,947.9	2,170.1	1,801.0
Liability for Unpaid Claims and Claims Adjustment Expense, Net	11,777.7	10,112.5	$ 10,916.8	$ 9,567.0
Current Year Claims and Claims Adjustment Expense	10,164.6	8,804.1
Prior Year Claims and Claims Adjustment Expense	81.5	74.2
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	10,246.1	8,878.3
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	5,533.7	4,951.0
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	3,851.5	3,381.8
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	9,385.2	8,332.8
Commercial And Personal Auto Businesses [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense		102.0
Special Lines and Property Businesses [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense		(28.0)
Accident years 2017 and 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	72.0
Accident year 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense		56.0
Personal Lines | Personal auto businesses
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	57.0
Personal Lines | Agency Auto [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	36.0	65.0
Personal Lines | Direct Auto [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	21.0	29.0
Property
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	7.0	$ (20.0)
Commercial Lines
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	$ 17.0

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Supplemental Cash Flow Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Open reverse repurchase commitments	$ 0	$ 0	$ 0
Income Taxes Paid	358,900,000	452,900,000
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	70,900,000	73,300,000
Cash and Cash Equivalents [Member] | ARX Holding Corp. [Member]
Open reverse repurchase commitments	$ 155,900,000	$ 130,200,000	$ 247,200,000

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Segment Information Operating Results (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Revenues	$ 8,018.0	$ 6,605.7	$ 15,448.1	$ 12,927.4
Pretax Profit (Loss)	880.1	554.6	1,790.9	1,196.1
Amortization of intangible assets	18.0	15.5	36.0	31.0
Personal Lines | Agency | Underwriting operations
Segment Reporting Information [Line Items]
Revenues	3,225.7	2,752.5	6,289.5	5,384.0
Pretax Profit (Loss)	360.9	205.5	770.0	455.2
Personal Lines | Direct | Underwriting operations
Segment Reporting Information [Line Items]
Revenues	3,211.8	2,650.0	6,228.1	5,173.7
Pretax Profit (Loss)	287.9	162.7	585.9	338.0
Operating Segments | Underwriting operations
Segment Reporting Information [Line Items]
Revenues	7,634.2	6,313.3	14,808.2	12,340.0
Pretax Profit (Loss)	697.2	428.0	1,527.8	928.0
Operating Segments | Personal Lines | Underwriting operations
Segment Reporting Information [Line Items]
Revenues	6,437.5	5,402.5	12,517.6	10,557.7
Pretax Profit (Loss)	$ 648.8	$ 368.2	$ 1,355.9	$ 793.2
Personal auto insurance percentage of the total personal lines segment net premiums earned	94.00%	93.00%	94.00%	93.00%
Operating Segments | Commercial Lines | Underwriting operations
Segment Reporting Information [Line Items]
Revenues	$ 884.3	$ 671.7	$ 1,692.9	$ 1,317.2
Pretax Profit (Loss)	$ 100.3	$ 56.2	$ 195.1	$ 123.6
Operating Segments | Property | Underwriting operations
Segment Reporting Information [Line Items]
Combined ratio amortization points	0.058	0.065	0.060	0.067
Revenues	$ 312.4	$ 239.1	$ 597.7	$ 465.1
Pretax Profit (Loss)	(51.9)	3.7	(23.4)	11.5
Amortization of intangible assets	18.0	15.5	36.0	31.0
Operating Segments | Other Indemnity | Underwriting operations
Segment Reporting Information [Line Items]
Revenues	0.0	0.0	0.0	0.0
Pretax Profit (Loss)	0.0	(0.1)	0.2	(0.3)
Segment Reconciling Items | Fees and other revenues
Segment Reporting Information [Line Items]
Revenues	116.0	88.8	219.8	174.0
Segment Reconciling Items | Service businesses
Segment Reporting Information [Line Items]
Revenues	42.9	32.7	77.1	61.2
Pretax Profit (Loss)	5.9	5.7	10.8	8.3
Segment Reconciling Items | Investment income
Segment Reporting Information [Line Items]
Revenues	224.9	170.9	343.0	352.0
Pretax Profit (Loss)	218.7	164.3	330.8	339.8
Segment Reconciling Items | Other gains (losses)
Segment Reporting Information [Line Items]
Revenues	0.0	0.0	0.0	0.2
Pretax Profit (Loss)	0.0	0.0	0.0	0.2
Segment Reconciling Items | Interest expense
Segment Reporting Information [Line Items]
Pretax Profit (Loss)	$ (41.7)	$ (43.4)	$ (78.5)	$ (80.2)

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Segment Information Underwriting Margins and Combined Ratios for our Underwriting Operations (Detail) - Underwriting operations	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Personal Lines | Agency
Segment Reporting Information [Line Items]
Underwriting Margin	11.20%	7.50%	12.20%	8.50%
Combined Ratio	88.80%	92.50%	87.80%	91.50%
Personal Lines | Direct
Segment Reporting Information [Line Items]
Underwriting Margin	9.00%	6.10%	9.40%	6.50%
Combined Ratio	91.00%	93.90%	90.60%	93.50%
Operating Segments
Segment Reporting Information [Line Items]
Underwriting Margin	9.10%	6.80%	10.30%	7.50%
Combined Ratio	90.90%	93.20%	89.70%	92.50%
Operating Segments | Personal Lines
Segment Reporting Information [Line Items]
Underwriting Margin	10.10%	6.80%	10.80%	7.50%
Combined Ratio	89.90%	93.20%	89.20%	92.50%
Operating Segments | Commercial Lines
Segment Reporting Information [Line Items]
Underwriting Margin	11.30%	8.40%	11.50%	9.40%
Combined Ratio	88.70%	91.60%	88.50%	90.60%
Operating Segments | Property
Segment Reporting Information [Line Items]
Underwriting Margin	(16.60%)	1.50%	(3.90%)	2.50%
Combined Ratio	116.60%	98.50%	103.90%	97.50%
Combined ratio amortization points	0.058	0.065	0.060	0.067

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Dividends Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Dec. 31, 2017	Dec. 31, 2016
Payments of Ordinary Dividends, Common Stock	$ 654.9	$ 395.4
Dividends payable			$ 655.1	$ 395.4
Annual variable dividend [Member]
Common Stock, Dividends, Per Share, Cash Paid	$ 1.1247	$ 0.6808

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Dividends - Additional Information (Detail)	1 Months Ended	6 Months Ended	60 Months Ended
	Mar. 31, 2023	Jun. 30, 2018 USD ($) $ / shares shares	Mar. 14, 2023	Mar. 31, 2018 $ / shares shares	Dec. 31, 2017 $ / shares shares	Jun. 30, 2017 $ / shares shares
Class of Stock [Line Items]
Target percentage used to determine annual variable dividend		33.33%			33.33%
Gainshare factor used to determine annual variable dividend range, minimum		0
Minimum Payments of Ordinary Dividends, Common Stock | $		$ 0
Gainshare factor used to determine annual variable dividend range, maximum		2
Gainshare factor used to determine annual variable dividend		1.91
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Issued (shares) | shares				500,000
Preferred Stock, Liquidation Preference Per Share (USD per share) | $ / shares				$ 1,000	$ 0	$ 0
Series B Preferred Stock [Member] | Serial Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Issued (shares) | shares		500,000.0			0	0
Preferred Stock, Liquidation Preference Per Share (USD per share) | $ / shares		$ 1,000
Scenario, Forecast [Member] | Series B Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage			5.375%
London Interbank Offered Rate (LIBOR) [Member] | Scenario, Forecast [Member] | Series B Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Basis Spread on Variable Rate	2.539%

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Other Comprehensive Income (Loss) Components of Other Comprehensive Income (Loss) Including Reclassification Adjustments by Income Statement (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
AOCI before Tax, Attributable to Parent, beginning balance	$ (218.6)	$ 1,645.9	$ 1,977.8	$ 1,439.5	$ 1,439.5
Pretax Cumulative Effect of New Accounting Principal in Period of Adoption					(2,006.0)
Pretax Reclassification of Stranded Amounts in AOCI to Retained Earnings					0.0
AOCI before Tax, Attributable to Parent, after Cumulative Effect Adjustment					(28.2)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax	(90.4)	177.2	(293.8)	431.7
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	0.0	(12.0)	0.0	(8.0)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	0.0	(0.2)	0.0	0.3
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Noncontrolling Interest	0.7	(1.9)	5.8	(3.4)
OCI, before Reclassifications, before Tax, Attributable to Parent	(89.7)	163.1	(288.0)	420.6
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax	0.0	(2.6)	0.0	(3.6)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	(27.2)	37.2	(34.9)	88.8
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	(0.3)	0.3	(0.5)	0.8
Total reclassification adjustment for amounts realized in net income, pre tax	(27.5)	34.9	(35.4)	86.0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	(62.2)	128.2	(252.6)	334.6
AOCI before Tax, Attributable to Parent, ending balance	(280.8)	1,774.1	(280.8)	1,774.1	1,977.8
Accumulated Other Comprehensive Income (Loss), Tax [Roll Forward]
AOCI Tax, Attributable to Parent, beginning balance	46.0	(578.4)	(695.6)	(506.1)	(506.1)
Tax, Cumulative Effect of New Accounting Principal in Period of Adoption					705.8
Tax, Reclassification of Stranded Amounts in AOCI to Retained Earnings					(4.3)
AOCI Tax, Attributable to Parent, After Cumulative Effect Adjustment					(5.9)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax	18.8	(62.1)	61.6	(151.3)
Forecasted transactions, Total tax (provision) benefit	0.0	4.2	0.0	2.8
Other Comprehensive Income (Loss), Foreign Current Translation Adjustment, Tax	0.0	0.1	0.0	(0.1)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Noncontrolling Interest	(0.1)	0.6	(1.2)	1.2
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax	18.7	(57.2)	60.4	(147.4)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Tax	0.0	0.9	0.0	1.3
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	5.7	(13.0)	7.3	(31.1)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0.1	(0.1)	0.1	(0.3)
Total reclassification adjustment for amounts realized in net income, Total tax (provision) benefit	5.8	(12.2)	7.4	(30.1)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	12.9	(45.0)	53.0	(117.3)
AOCI Tax, Attributable to Parent, ending balance	58.9	(623.4)	58.9	(623.4)	(695.6)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
After tax total accumulated other comprehensive income, beginning balance	(172.6)	1,067.5	1,282.2	933.4	933.4
Cumulative Effect of New Accounting Principle in Period of Adoption					(1,300.2)
Reclassification of Stranded Amounts in AOCI to Retained Earnings					(4.3)
AOCI, Net of Tax, After Cumulative Effect Adjustment					(22.3)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax	(71.6)	115.1	(232.2)	280.4
Forecasted transactions, after tax	0.0	(7.8)	0.0	(5.2)
Foreign currency translation adjustment	0.0	(0.1)	0.0	0.2
Other comprehensive (income) loss attributable to NCI	0.6	(1.3)	4.6	(2.2)	(2.3)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(71.0)	105.9	(227.6)	273.2
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax	0.0	(1.7)	0.0	(2.3)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	(21.5)	24.2	(27.6)	57.7
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(0.2)	0.2	(0.4)	0.5
Total reclassification adjustment for amounts realized in net income, after tax	(21.7)	22.7	(28.0)	55.9
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(49.3)	83.2	(199.6)	217.3
After tax total accumulated other comprehensive income, ending balance	(221.9)	1,150.7	(221.9)	1,150.7	1,282.2
Net unrealized gains (losses) on securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
After tax total accumulated other comprehensive income, beginning balance	(160.8)	1,072.0	1,295.0	939.6	939.6
Cumulative Effect of New Accounting Principle in Period of Adoption					(1,300.2)
Reclassification of Stranded Amounts in AOCI to Retained Earnings					(1.1)
AOCI, Net of Tax, After Cumulative Effect Adjustment					(6.3)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax	(71.6)	115.1	(232.2)	280.4
Forecasted transactions, after tax	0.0	0.0	0.0	0.0
Foreign currency translation adjustment	0.0	0.0	0.0	0.0
Other comprehensive (income) loss attributable to NCI	0.0	0.0	0.0	0.0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(71.6)	115.1	(232.2)	280.4
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax	0.0	(1.7)	0.0	(2.3)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	(21.5)	24.2	(27.6)	57.7
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0.0	0.0	0.0	0.0
Total reclassification adjustment for amounts realized in net income, after tax	(21.5)	22.5	(27.6)	55.4
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(50.1)	92.6	(204.6)	225.0
After tax total accumulated other comprehensive income, ending balance	(210.9)	1,164.6	(210.9)	1,164.6	1,295.0
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
After tax total accumulated other comprehensive income, beginning balance	(17.8)	(7.1)	(14.8)	(9.4)	(9.4)
Cumulative Effect of New Accounting Principle in Period of Adoption					0.0
Reclassification of Stranded Amounts in AOCI to Retained Earnings					(3.2)
AOCI, Net of Tax, After Cumulative Effect Adjustment					(18.0)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax	0.0	0.0	0.0	0.0
Forecasted transactions, after tax	0.0	(7.8)	0.0	(5.2)
Foreign currency translation adjustment	0.0	0.0	0.0	0.0
Other comprehensive (income) loss attributable to NCI	0.0	0.0	0.0	0.0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0.0	(7.8)	0.0	(5.2)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax	0.0	0.0	0.0	0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	0.0	0.0	0.0	0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(0.2)	0.2	(0.4)	0.5
Total reclassification adjustment for amounts realized in net income, after tax	(0.2)	0.2	(0.4)	0.5
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0.2	(8.0)	0.4	(5.7)
After tax total accumulated other comprehensive income, ending balance	(17.6)	(15.1)	(17.6)	(15.1)	(14.8)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
After tax total accumulated other comprehensive income, beginning balance	0.0	(0.8)	0.0	(1.1)	(1.1)
Cumulative Effect of New Accounting Principle in Period of Adoption					0.0
Reclassification of Stranded Amounts in AOCI to Retained Earnings					0.0
AOCI, Net of Tax, After Cumulative Effect Adjustment					0.0
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax	0.0	0.0	0.0	0.0
Forecasted transactions, after tax	0.0	0.0	0.0	0.0
Foreign currency translation adjustment	0.0	(0.1)	0.0	0.2
Other comprehensive (income) loss attributable to NCI	0.0	0.0	0.0	0.0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0.0	(0.1)	0.0	0.2
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax	0.0	0.0	0.0	0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	0.0	0.0	0.0	0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0.0	0.0	0.0	0.0
Total reclassification adjustment for amounts realized in net income, after tax	0.0	0.0	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0.0	(0.1)	0.0	0.2
After tax total accumulated other comprehensive income, ending balance	0.0	(0.9)	0.0	(0.9)	0.0
Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
After tax total accumulated other comprehensive income, beginning balance	6.0	3.4	2.0	4.3	4.3
Cumulative Effect of New Accounting Principle in Period of Adoption					0.0
Reclassification of Stranded Amounts in AOCI to Retained Earnings					0.0
AOCI, Net of Tax, After Cumulative Effect Adjustment					2.0
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax	0.0	0.0	0.0	0.0
Forecasted transactions, after tax	0.0	0.0	0.0	0.0
Foreign currency translation adjustment	0.0	0.0	0.0	0.0
Other comprehensive (income) loss attributable to NCI	0.6	(1.3)	4.6	(2.2)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0.6	(1.3)	4.6	(2.2)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax	0.0	0.0	0.0	0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	0.0	0.0	0.0	0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0.0	0.0	0.0	0.0
Total reclassification adjustment for amounts realized in net income, after tax	0.0	0.0	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0.6	(1.3)	4.6	(2.2)
After tax total accumulated other comprehensive income, ending balance	$ 6.6	$ 2.1	$ 6.6	$ 2.1	$ 2.0

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Other Comprehensive Income (Loss) Components of Other Comprehensive Income (Loss) Including Reclassification Adjustments by Income Statement, Additional Information (Detail) $ in Millions	Jun. 30, 2018 USD ($)
Statement of Comprehensive Income [Abstract]
Net unrealized gains on forecasted transactions, expected to reclassify into income within the next 12 months	$ 1.0

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Redeemable Noncontrolling Interest (Details) $ in Millions		3 Months Ended			6 Months Ended			12 Months Ended
		Jun. 30, 2018 USD ($) shares	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) shares		Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Apr. 01, 2021
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance, Beginning of period					$ 503.7	[1]	$ 483.7	$ 483.7
Net income attributable to NCI		$ (3.0)		$ 5.1	8.8		11.1	5.9
Other comprehensive income (loss) attributable to NCI		(0.6)		1.3	(4.6)		2.2	2.3
Exercise of employee stock options					9.4		3.4	3.4
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		(295.9)	$ 0.0	0.0
Change in redemption value of NCI					(3.2)		1.4	8.4
Balance, End of period	[1]	$ 218.2	$ 503.7	$ 501.8	$ 218.2		$ 501.8	$ 503.7
ARX Holding Corp. [Member]
Redeemable Noncontrolling Interest [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage		86.70%	69.00%	69.00%	86.70%		69.00%	69.00%
Shares held in Employee Stock Option Plan, Suspense Shares | shares		16,067			16,067
Employee Stock Ownership Plan (ESOP), Deferred Shares, Fair Value		$ 23.2			$ 23.2
Number of Shares Put Pursuant to Stockholders' Agreement | shares		204,527			204,527
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | shares		5,483
Payments to Acquire Interest in Subsidiaries and Affiliates		$ 295.9
Scenario, Forecast [Member] | ARX Holding Corp. [Member]
Redeemable Noncontrolling Interest [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage									100.00%

[1] See Note 12 – Redeemable Noncontrolling Interest for further discussion.

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Goodwill and Intangible Assets Goodwill (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill, Acquired During Period			$ 0
Goodwill	$ 452,700,000	$ 452,700,000	452,700,000	$ 452,700,000	$ 452,700,000	$ 452,700,000
Goodwill, Impaired, Accumulated Impairment Loss	0		0		$ 0
Amortization of intangible assets	$ 18,000,000	$ 15,500,000	$ 36,000,000	$ 31,000,000
Weighted Average [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period			4 years 4 months 25 days
Trade name [Member]
Goodwill [Line Items]
Finite-Lived Intangible Asset, Useful Life				10 years	2 years

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Goodwill and Intangible Assets - Net Carrying Amount of Other Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Schedule of Other Intangible Assets [Line Items]
Indefinite lived intangible assets	$ 12.4	$ 12.4	$ 12.4
Total	330.6	366.6	401.8
Accumulated amortization	211.7	175.7	140.5
Licensing Agreements [Member]
Schedule of Other Intangible Assets [Line Items]
Accumulated amortization	$ 0.6	$ 0.6	$ 0.6

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Goodwill and Intangible Assets - Finite-lived Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ 211.7	$ 175.7	$ 140.5
Policies in force [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	256.2	256.2	256.2
Accumulated Amortization	119.0	100.7	82.4
Net Carrying Amount	137.2	155.5	173.8
Agency relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	159.2	159.2	159.2
Accumulated Amortization	37.0	31.3	25.6
Net Carrying Amount	122.2	127.9	133.6
Software rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	79.1	79.1	79.1
Accumulated Amortization	34.7	29.4	24.1
Net Carrying Amount	44.4	49.7	55.0
Trade name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	34.8	34.8	34.8
Accumulated Amortization	20.4	13.7	7.8
Net Carrying Amount	14.4	21.1	27.0
Finite-Lived Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	529.3	529.3	529.3
Accumulated Amortization	211.1	175.1	139.9
Net Carrying Amount	$ 318.2	$ 354.2	$ 389.4

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New Accounting Standards Effect of Standard Change (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017	Mar. 31, 2017
Item Effected [Line Items]
Liabilities		$ 32,144.5	$ 27,196.5	$ 32,144.5	$ 27,196.5		$ 28,912.7
Assets		43,363.5	36,689.8	43,363.5	36,689.8		38,701.2
Provision (benefit) for income taxes		178.9	181.9	359.9	393.1
Cumulative Effect of New Accounting Principle in Period of Adoption							1,300.2
Reclassification of Stranded Amounts in AOCI to Retained Earnings							$ 4.3
Accounting Standards Update 2016-01 [Member]
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption						$ 1,300.0
Adjustments for New Accounting Pronouncement | Pro Forma [Member] | Property Subject to Operating Lease [Member]
Item Effected [Line Items]
Liabilities		140.0		140.0
Assets		140.0		140.0
Accounting Standards Update 2018-02 [Member]
Item Effected [Line Items]
Reclassification of Stranded Amounts in AOCI to Retained Earnings								$ 4.3
Retained Earnings | Accounting Standards Update 2016-01 [Member]
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	[1]	1,300.2	0.0	1,300.2	0.0
Retained Earnings | Accounting Standards Update 2018-02 [Member]
Item Effected [Line Items]
Reclassification of Stranded Amounts in AOCI to Retained Earnings	[1]	$ 4.3	$ 0.0	$ 4.3	$ 0.0

[1] See Note 14 – New Accounting Standards for further discussion.