CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues
Earned premiums	$ 258.6	$ 293.6	$ 751.2	$ 1,134.7
Net investment income	16.1	21.6	55.8	74.9
Net realized and unrealized investment (losses) gains	(47.4)	51.6	(13.3)	79.6
Net other revenues (expenses)	0.1	12.7	(10.6)	1.9
Total revenues	227.4	379.5	783.1	1,291.1
Expenses
Loss and LAE	146.6	155.2	414.9	719.3
Policy acquisition expenses	58.6	64.3	161.1	248.3
Other underwriting expenses	38.7	50.5	132.1	176.6
General and administrative expenses	2.5	2.1	7.4	9.4
Interest expense on debt	4.1	6.4	16.4	23.4
Total expenses	250.5	278.5	731.9	1,177.0
Pre-tax (loss) income from continuing operations	(23.1)	101.0	51.2	114.1
Income tax benefit (expense)	11.1	(9.6)	(3.0)	(11.7)
Net (loss) income from continuing operations	(12.0)	91.4	48.2	102.4
Loss from discontinued operations, net of tax	(2.5)	(3.8)	(4.4)	(5.4)
Loss from sale of discontinued operations, net of tax	(18.2)	0	(18.2)	0
Net (loss) income including noncontrolling interests	(32.7)	87.6	25.6	97.0
Less: Net income attributable to noncontrolling interests	(0.2)	(0.8)	(1.1)	(1.6)
Net (loss) income attributable to OneBeacon's common shareholders	(32.9)	86.8	24.5	95.4
Change in other comprehensive income and loss items	0.2	(0.3)	0.3	(0.1)
Comprehensive (loss) income attributable to OneBeacon's common shareholders	$ (32.7)	$ 86.5	$ 24.8	$ 95.3
(Loss) earnings per share attributable to OneBeacon's common shareholders - basic and diluted
Net (loss) income from continuing operations per share (in dollars per share)	$ (0.13)	$ 0.97	$ 0.51	$ 1.08
Loss from discontinued operations, net of tax, per share (in dollars per share)	$ (0.03)	$ (0.04)	$ (0.05)	$ (0.06)
Loss from sale of discontinued operations, net of tax, per share (in dollars per share)	$ (0.19)		$ (0.19)
Net (loss) income attributable to OneBeacon's common shareholders per share (in dollars per share)	$ (0.35)	$ 0.92	$ 0.26	$ 1.01
Dividends declared and paid per OneBeacon's common share (in dollars per share)	$ 0.21	$ 2.71	$ 1.63	$ 3.13