CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Proceeds from Contributions from Affiliates	$ 1.6	$ 0
Proceeds from (Payments for) Other Financing Activities	(0.7)	0
Payments for Derivative Instrument, Financing Activities	(9.9)	0
Proceeds from Derivative Instrument, Financing Activities	9.7	0
Cash flows from operations:
Net income	191.2	137.2
Charges (credits) to reconcile net income to net cash (used for) provided from operations:
Net realized and unrealized investment gains	(66.1)	(123.2)
Deferred income tax expense	5.4	50.4
Net (income) loss from discontinued operations	(4.8)	24.5
Net loss on sale of discontinued operation	0	91.0
Gain on sale of subsidiary - Essentia	(23.0)	0
Excess of fair value of acquired net assets over cost - American Fuji	(6.9)	0
Undistributed equity in earnings from unconsolidated affiliates, net of tax	(24.9)	(24.4)
Other operating items:
Net change in loss and loss adjustment expense reserves	(95.1)	(241.6)
Net change in reinsurance recoverable on paid and unpaid losses	15.5	98.1
Net change in unearned insurance and reinsurance premiums	(30.6)	(22.1)
Net change in variable annuity benefit guarantee liabilities	(297.8)	(96.1)
Net change in variable annuity benefit guarantee derivative instruments	6.8	48.3
Net change in deferred acquisition costs	7.6	(21.9)
Net change in funds held by ceding companies	36.0	5.3
Net change in ceded unearned premiums	91.2	206.6
Net change in funds held under reinsurance treaties	44.8	1.9
Net change in insurance and reinsurance premiums receivable	(143.8)	(206.9)
Net change in ceded reinsurance payable	53.2	31.5
Increase (Decrease) in Restricted Cash for Operating Activities	175.4	111.8
Net change in other assets and liabilities, net	88.6	(43.4)
Net cash provided from operations - continuing operations	22.7	27.0
Net cash used for operations - discontinued operations	(93.5)	(155.6)
Net cash used for operations	(70.8)	(128.6)
Cash flows from investing activities:
Net change in short-term investments	(9.9)	(127.3)
Sales of fixed maturity and convertible fixed maturity investments	3,350.9	4,918.8
Maturities, calls and paydowns of fixed maturity and convertible fixed maturity investments	380.0	408.7
Sales of common equity securities	412.5	99.7
Distributions and redemptions of other long-term investments	36.6	20.9
Sales of consolidated and unconsolidated affiliates, net of cash sold	31.3	9.8
Funding of operational cash flows for discontinued operations	(93.5)	(155.6)
Purchases of other long-term investments	(31.7)	(28.8)
Purchases of common equity securities	(357.6)	(284.2)
Purchases of fixed maturity and convertible fixed maturity investments	(3,403.8)	(4,239.0)
Purchases of consolidated and unconsolidated affiliates, net of cash acquired	(9.2)	0
Net change in unsettled investment purchases and sales	(17.8)	(149.5)
Net acquisitions of property and equipment	(10.4)	(1.5)
Net cash provided from investing activities - continuing operations	277.4	472.0
Net cash provided from investing activities - discontinued operations	93.5	155.6
Net cash provided from investing activities	370.9	627.6
Cash flows from financing activities:
Draw down of revolving line of credit	150.0	0
Repayment of revolving line of credit	(225.0)	0
Payments on capital lease obligation	(4.0)	0
Cash dividends paid to the Company’s common shareholders	(6.2)	(6.6)
Cash dividends paid to OneBeacon Ltd.’s non-controlling common shareholders	(14.9)	(14.9)
Cash dividends paid on SIG Preference Shares	(9.4)	(9.4)
Common shares repurchased	(79.8)	(517.5)
Members contribution	11.5	0
Net cash used for financing activities - continuing operations	(177.1)	(548.4)
Net cash (used for) provided from financing activities - discontinued operations	0	0
Net cash used for financing activities	(177.1)	(548.4)
Effect of exchange rate changes on cash	1.0	3.0
Net change in cash during the period	124.0	(46.4)
Cash reclassified from assets held for sale (cash sold of $0 and $3.5)	0	2.0
Cash balances at beginning of period (excludes restricted cash balances of $249.8 and $453.5)	212.6	251.9
Cash balances at end of period (excludes restricted cash balances of $74.4 and $341.7)	336.6	207.5
Supplemental cash flows information:
Interest paid	(32.0)	(21.4)
Net income tax payments to national governments	$ (1.5)	$ (6.5)