CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operations:
Net (loss) income including noncontrolling interests	$ (4.7)	$ 25.6
Charges (credits) to reconcile net income to cash flows used for operations:
Net loss from discontinued operations	24.8	1.5
Net loss from sale of discontinued operations	91.0	18.2
Net realized and unrealized investment (gains) losses	(57.9)	13.3
Net other realized losses		11.7
Deferred income tax expense (benefit)	12.3	(12.9)
Other operating items:
Net change in loss and loss adjustment expense reserves	(0.9)	33.4
Net change in unearned premiums	85.2	73.2
Net change in ceded reinsurance payable	(0.8)	(4.7)
Net change in ceded unearned premiums	(0.7)	0.5
Net change in premiums receivable	(45.7)	(61.3)
Net change in reinsurance recoverable on paid and unpaid losses	64.4	(3.0)
Net change in other assets and liabilities	(34.4)	(35.5)
Net cash provided from operations - continuing operations	132.6	60.0
Net cash used for operations - discontinued operations	(155.6)	(150.6)
Net cash used for operations	(23.0)	(90.6)
Cash flows from investing activities:
Net maturities, purchases and sales of short-term investments	(22.7)	114.3
Maturities of fixed maturity investments	147.5	389.8
Sales of fixed maturity investments	1,305.9	1,113.2
Sales of common equity securities	37.2	89.7
Sales of convertible fixed maturity investments	16.0	34.4
Distributions and redemptions of other investments	6.9	34.9
Purchases of fixed maturity investments	(1,317.2)	(1,210.1)
Purchases of common equity securities	(49.3)	(74.3)
Purchases of convertible fixed maturity investments	(6.8)	(28.8)
Contributions for other investments	(3.1)	(9.8)
Net change in unsettled investment purchases and sales	(69.1)	(8.2)
Net acquisitions of property and equipment	(1.2)	(3.2)
Net cash provided from investing activities - continuing operations	44.1	441.9
Net cash provided from investing activities - discontinued operations	0
Net cash provided from investing activities	44.1	441.9
Cash flows from financing activities:
Repurchases of debt		(161.6)
Cash dividends paid to common shareholders	(60.0)	(154.8)
Proceeds on sale of OneBeacon Holdings (Luxembourg) S.a r.l.	14.0
Net cash used for financing activities - continuing operations	(46.0)	(316.4)
Net cash used for financing activities - discontinued operations	0
Net cash used for financing activities	(46.0)	(316.4)
Net (decrease) increase in cash during period	(24.9)	34.9
Cash reclassified from (to) assets held for sale as part of the AutoOne Transaction	5.5	(5.5)
Cash transferred as part of the AutoOne Transaction	(3.5)
Net (decrease) increase excluding cash relating to the AutoOne Transaction	(22.9)	29.4
Cash balance at beginning of period	54.9	33.6
Cash balance at end of period	32.0	63.0
Supplemental cash flows information:
Interest paid	8.2	12.5
Net tax payments to (refunds from) state and national governments	$ 0.5	$ (3.8)