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Reserves for Losses and Adjustment Expenses - Reconciliation of Reinsurance Recoverables on Unpaid Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Insurance [Abstract]
Adverse development cover reinsurance agreement cover	$ 0.0	$ (818.5)	$ 0.0
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance recoverables on unpaid losses, start of period	3,195.2	2,319.8
Reinsurance recoverables on unpaid losses, end of period	3,298.1	3,195.2	2,319.8
Deferred Gain on Reinsurance	(58.3)	0.0	0.0
ADC
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance recoverables on unpaid losses, start of period	2,518.3	2,425.2	2,319.8
Reinsurance recoverables on unpaid losses, end of period		2,518.3	2,425.2
Reinsurance recoverables, premium paid and recognized	68.1	0.0	0.0
Enstar
Insurance [Abstract]
Adverse development cover reinsurance agreement cover	$ 770.0	$ 770.0	$ 0.0

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Deferred Gain on Retroactive Reinsurance

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Liability for unpaid claims and claims adjustment expense amount disposed of.

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- Definition

Reinsurance recoverables, including premium paid and recognized

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(6))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489

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