CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operations:
Net income	$ 5.5	$ 235.1
Charges (credits) to reconcile net income to net cash used for operations:
Net realized and unrealized investment losses (gains)	33.9	(64.4)
Deferred income tax (benefit) expense	(20.2)	5.8
Net income from discontinued operations	(73.3)	(166.8)
Net gain on sale of discontinued operations	(18.2)	(9.7)
Gain on sale of subsidiaries - Hamer and Essentia	(16.1)	0.0
Amortization and depreciation	46.8	27.6
Undistributed equity in earnings from unconsolidated affiliates, net of tax	(18.0)	(33.3)
Other operating items:
Net change in loss and loss adjustment expense reserves	83.3	101.7
Net change in reinsurance recoverable on paid and unpaid losses	(63.3)	(23.4)
Net change in unearned insurance premiums	54.6	90.8
Net change in variable annuity benefit guarantee liabilities	(1.7)	(41.1)
Net change in variable annuity benefit guarantee derivative instruments	19.4	3.9
Net change in deferred acquisition costs	(3.6)	(19.7)
Net change in funds held by ceding entities	32.5	(33.3)
Net change in ceded unearned premiums	(23.4)	(0.4)
Net change in funds held under insurance treaties	19.3	13.5
Net change in insurance premiums receivable	(32.0)	(50.4)
Net change in ceded reinsurance payable	12.6	3.3
Net change in restricted cash	6.9	32.3
Net change in other assets and liabilities, net	35.6	2.0
Net cash provided from operations - continuing operations	80.6	73.5
Net cash provided from operations	87.3	123.3
Cash flows from investing activities:
Net change in short-term investments	26.6	(104.2)
Sales of fixed maturity and convertible fixed maturity investments	865.0	1,734.7
Maturities, calls and paydowns of fixed maturity and convertible fixed maturity investments	249.5	241.6
Sales of common equity securities	370.6	312.8
Distributions and redemptions of other long-term investments	56.6	26.2
Sales of consolidated and unconsolidated affiliates, net of cash sold	24.0	0.0
Net change in cash during the period	17.5	(27.6)
Purchases of other long-term investments	(30.5)	(26.8)
Purchases of common equity securities	(329.4)	(141.9)
Purchases of fixed maturity and convertible fixed maturity investments	(1,300.2)	(1,822.6)
Purchases of consolidated and unconsolidated affiliates, net of cash acquired	(33.3)	(32.2)
Net change in unsettled investment purchases and sales	71.8	9.3
Net dispositions (acquisitions) of property and equipment	37.0	(3.3)
Net cash provided from investing activities - continuing operations	25.2	166.0
Net cash provided from investing activities	60.9	213.5
Cash flows from financing activities:
Draw down of debt and revolving line of credit	134.0	40.0
Repayment of debt and revolving line of credit	(92.9)	(40.2)
Payments on capital lease obligation	(3.5)	(4.0)
Cash dividends paid to the Company’s common shareholders	(6.0)	(6.2)
Cash dividends paid to OneBeacon Ltd.’s non-controlling common shareholders	(14.8)	(14.8)
Common shares repurchased	(168.6)	(100.6)
OneBeacon Ltd. common shares repurchased and retired	(1.8)	(1.8)
Proceeds from Partnership Contribution	0.0	2.5
Distribution to non-controlling interest shareholders	(9.1)	0.0
Proceeds from (Payments for) Other Financing Activities	0.0	(4.9)
Distributions from contributions to discontinued operations	(9.1)	40.8
Payments to Acquire Additional Interest in Subsidiaries	(9.1)	0.0
Capital contributions from BAM members	20.3	11.6
Net cash used for financing activities - continuing operations	(160.6)	(77.6)
Net cash used for financing activities	(163.0)	(133.2)
Effect of exchange rate changes on cash (excludes ($4.1) and ($10.6) related to discontinued operations)	0.0	0.0
Net change in cash during the period - continuing operations	(54.8)	161.9
Cash balances at beginning of period	238.0	233.5
Cash balances at end of period	183.2	395.4
Supplemental cash flows information:
Interest paid	(8.9)	(6.4)
Net income tax refund from national governments	8.0	0.3
Discontinued Operations [Member]
Charges (credits) to reconcile net income to net cash used for operations:
Net realized and unrealized investment losses (gains)	(31.4)	(134.1)
Net income from discontinued operations	(95.5)	(218.6)
Net gain on sale of discontinued operations	(73.3)	(166.8)
Other operating items:
Net cash provided from operations - discontinued operations	6.7	49.8
Cash flows from investing activities:
Net change in cash during the period	35.9	31.1
Net cash provided from investing activities - discontinued operations	35.7	47.5
Cash flows from financing activities:
Net cash used for financing activities - discontinued operations	(2.4)	(55.6)
Cash balances at beginning of period	111.5	93.2
Cash balances at end of period	147.4	124.3
Supplemental cash flows information:
Net income tax refund from national governments	$ 30.3	$ (7.5)