Third Party Reinsurance (Sirius Group) (Details) (USD $) In Millions, unless otherwise specified					9 Months Ended
Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Sirius	Dec. 31, 2013 Sirius Group	Sep. 30, 2014 Medical insurance [Member] Sirius Group
Reinsurance Retention Policy [Line Items]
Reinsurance recoverable on paid losses	$ 27.2	$ 25.4	$ 14.5	$ 15.7
Reinsurance recoverable on unpaid losses	430.7	428.1	329.3	347.9
Reinsurance Retention Policy, Amount Retained					$ 1.0

Amount after valuation allowance of reinsurance recoverables on paid losses.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 310

-Section 45

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489

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- Definition

Amount after valuation allowance of reinsurance recoverables for losses reported to the ceding insurer but not yet paid, amounts expected of incurred losses and settlement expenses, which have not yet been reported to the ceding insurer.

+ References

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- Definition

Stated amount that is the upper retention limit per entity policy.

+ References

No definition available.

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