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Segment Information - Pre-tax income (loss) from exited business (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Pre-tax income (loss) from exited business:
Change in fair value of funds withheld embedded derivative		$ (265.9)	$ (776.8)	$ (455.3)	$ (346.9)
Net realized capital gains (losses) on funds withheld assets	[1]	(0.2)	39.4	31.5	105.9
Reconciling items
Pre-tax income (loss) from exited business:
Change in fair value of funds withheld embedded derivative		(265.9)	(776.8)	(455.3)	(346.9)
Net realized capital gains (losses) on funds withheld assets		(0.2)	39.4	31.5	105.9
Amortization of reinsurance gain (loss)		(18.3)	(46.4)	(65.1)	(474.0)
Other impacts of exited business		(34.3)	(25.3)	(177.2)	99.6
Total pre-tax income (loss) from exited business		$ (318.7)	$ (809.1)	$ (666.1)	$ (615.4)
[1] Includes realized and unrealized gains (losses). See Note 4, Investments, for further details.

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Amount of increase (decrease) in pre-tax income due to other impacts of exited business.

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The sum of income (expense), before income taxes for exited business.

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