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Debt (Details) (USD $) In Millions	9 Months Ended					1 Months Ended		12 Months Ended				3 Months Ended
	Sep. 30, 2010	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 OBH Senior Notes OneBeacon U.S. Holdings, Inc. ("OBH")	Dec. 31, 2010 OBH Senior Notes OneBeacon U.S. Holdings, Inc. ("OBH")	Apr. 30, 2011 OBH Senior Notes Tender offer.	Jun. 30, 2010 OBH Senior Notes Tender offer.	Dec. 31, 2010 OBH Senior Notes Additional repurchase and retirement of debt	Dec. 31, 2010 OBH Senior Notes Repurchase and retirement of debt	Sep. 30, 2011 Sirius Group Senior Notes	Dec. 31, 2010 Sirius Group Senior Notes	Sep. 30, 2011 WTM Bank Facility	Aug. 12, 2011 Previous revolving credit facility
Debt Instrument
Debt instrument at face value				$ 269.9	$ 419.9					$ 400.0	$ 400.0
Unamortized original issue discount				(0.2)	(0.3)					(0.7)	(0.8)
Total debt		669.0	818.8	269.7	419.6					399.3	399.2
Aggregate principal amount of senior notes purchased and retired						150.0	156.4	29.7	1.1
Aggregate purchase price of senior notes purchased and retired	197.3					161.6	165.4	30.8	1.1
Loss on retirement of debt						12.0	9.6	1.2
Total commitment under revolving credit facility												375.0	475.0
Interest expense												$ 2.2

X

- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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