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Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Discontinued Operations [Line Items}
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	$ 8.0	$ 0
Net loss from discontinued operations, net of tax	(7.9)	(0.5)
Other revenue	35.8us-gaap_OtherIncome	(3.4)us-gaap_OtherIncome	(3.4)us-gaap_OtherIncome
Segment, Discontinued Operations
Discontinued Operations [Line Items}
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	8.0
Net loss from discontinued operations, net of tax	(0.1)	(0.5)
OneBeacon Runoff [Member] \| Segment, Discontinued Operations
Discontinued Operations [Line Items}
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	$ (0.1)	$ (0.5)

Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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