Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Name:	us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Held for Sale and Discontinued Operations - (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Discontinued Operations [Line Items}
Net gain from sale of discontinued operations, net of tax	$ 0.9	$ 0.7
Connecticut \| Discontinued Operations, Held-for-sale
Discontinued Operations [Line Items}
Assets held for sale	3.0		$ 3.0
Sirius Group \| Swedish Tax Authority \| Sirius Group
Discontinued Operations [Line Items}
Contingent liability	$ 15.5		$ 16.5