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Debt (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Aug. 14, 2013 WTM Bank Facility	Mar. 31, 2014 Old Lyme	Dec. 31, 2013 Old Lyme	Mar. 31, 2014 Other	Dec. 31, 2013 Other	Mar. 31, 2014 OneBeacon 2012 OBH Senior Notes	Dec. 31, 2013 OneBeacon 2012 OBH Senior Notes	Mar. 31, 2014 Sirius Group SIG Senior Notes	Dec. 31, 2013 Sirius Group SIG Senior Notes	Mar. 31, 2014 White Mountains WTM Bank Facility	Dec. 31, 2013 White Mountains WTM Bank Facility
Debt Instrument
Debt instrument at face value									$ 275.0	$ 275.0	$ 400.0	$ 400.0
Unamortized original issue discount									(0.3)	(0.3)	(0.4)	(0.4)
Total debt	677.6		676.4		2.1	2.1	1.2	0	274.7	274.7	399.6	399.6	0	0
Total commitment under revolving credit facility				425.0
Repayments of debt	$ 0	$ 155.0

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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