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Segment Information - Pre-tax income (loss) from exited business (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Pre-tax income (loss) from exited business:
Change in fair value of funds withheld embedded derivative		$ (209.7)	$ 197.0
Net realized capital gains (losses) on funds withheld assets	[1]	28.0	47.5
Reconciling items
Pre-tax income (loss) from exited business:
Change in fair value of funds withheld embedded derivative		(209.7)	197.0
Net realized capital gains (losses) on funds withheld assets		28.0	47.5
Amortization of reinsurance gain (loss)		(26.4)	(10.1)
Other impacts of exited business		(106.2)	(36.8)
Total pre-tax income (loss) from exited business		$ (314.3)	$ 197.6
[1] Includes realized and unrealized gains (losses). See Note 4, Investments, for further details.

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The amount of change in fair value of funds withheld embedded derivative.

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Amount of realized capital gains (losses) on funds withheld assets.

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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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