CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Cash flows from operations:
Net income	$ 77.0	$ 94.9
Charges (credits) to reconcile net income to net cash used for operations:
Net realized and unrealized investment gains	(103.4)	(63.8)	(63.8)
Deferred income tax expense	12.2	21.7
Net income from discontinued operations	7.9	0.5
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	8.0	0
Gain on sale of subsidiary - Citation	0	(0.7)
Amortization and depreciation	22.2	15.4
Undistributed equity in earnings from unconsolidated affiliates, net of tax	(7.3)	(13.8)
Other operating items:
Net change in loss and loss adjustment expense reserves	(39.3)	(44.6)
Net change in reinsurance recoverable on paid and unpaid losses	20.0	13.9
Net change in unearned insurance and reinsurance premiums	181.3	217.7
Net change in variable annuity benefit guarantee liabilities	(0.4)	1.3
Net change in variable annuity benefit guarantee derivative instruments	9.4	(20.4)
Net change in deferred acquisition costs	(20.2)	(15.3)
Net change in funds held by ceding entities	21.4	12.6
Net change in ceded unearned premiums	(61.5)	(60.6)
Net change in funds held under reinsurance treaties	9.8	0.7
Net change in insurance and reinsurance premiums receivable	(190.5)	(212.4)
Net change in ceded reinsurance payable	56.4	78.6
Net change in restricted cash	(5.3)	33.9
Net change in other assets and liabilities, net	(55.3)	(92.2)
Net cash used for operations - continuing operations	(65.6)	(32.6)
Net cash provided from (used for) operations - discontinued operations	7.9	(14.6)
Net cash used for operations	(57.7)	(47.2)
Cash flows from investing activities:
Net change in short-term investments	(86.1)	(61.5)
Sales of fixed maturity and convertible fixed maturity investments	1,110.8	1,026.3
Maturities, calls and paydowns of fixed maturity and convertible fixed maturity investments	138.2	189.7
Sales of common equity securities	80.0	63.4
Distributions and redemptions of other long-term investments	6.4	23.9
Sales of consolidated and unconsolidated affiliates, net of cash sold	0	12.8
Funding from (of) operational cash flows for discontinued operations	7.9	(14.6)
Purchases of other long-term investments	(9.5)	(13.0)
Purchases of common equity securities	(49.5)	(65.0)
Purchases of fixed maturity and convertible fixed maturity investments	(1,282.3)	(1,138.3)
Purchases of consolidated and unconsolidated affiliates, net of cash acquired	(2.4)	(32.2)
Net change in unsettled investment purchases and sales	135.2	52.6
Net acquisitions of property and equipment	(5.0)	(0.5)
Net cash provided from investing activities - continuing operations	43.7	43.6
Net cash (used for) provided from investing activities - discontinued operations	(7.9)	14.6
Net cash provided from investing activities	35.8	58.2
Cash flows from financing activities:
Draw down of debt and revolving line of credit	4.5	0
Repayment of debt and revolving line of credit	(1.3)	0
Payments on capital lease obligation	(1.3)	(1.3)
Cash dividends paid to the Company’s common shareholders	(6.0)	(6.2)
Cash dividends paid to OneBeacon Ltd.’s non-controlling common shareholders	(4.9)	(4.9)
Common shares repurchased	(4.3)	(10.9)
OneBeacon Ltd. common shares repurchased and retired	1.7	0
Distribution to non-controlling interest shareholders	(0.7)	0
Collateral provided by interest rate cap counterparties	(1.2)	(2.6)
Capital contributions from BAM members	4.6	4.8
Net cash used for financing activities - continuing operations	(12.3)	(21.1)
Net cash (used for) provided from financing activities - discontinued operations	0	0
Net cash used for financing activities	(12.3)	(21.1)
Effect of exchange rate changes on cash	(8.5)	(0.2)
Net change in cash during the period	(42.7)	(10.3)
Cash balances at beginning of period (excludes restricted cash balances of $23.7 and $56.1)	349.5	326.7	326.7
Cash balances at end of period (excludes restricted cash balances of $29.0 and $22.2)	306.8	316.4	349.5
Supplemental cash flows information:
Interest paid	(12.8)	(12.8)
Net income tax (payment) refund to national governments	$ (15.0)	$ 3.8