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Segment Information - Income Tax Expense (Benefit) Related to Exited Business (Details) - Reconciling items - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Information: Income tax expense (benefit)
Change in fair value of funds withheld embedded derivative	$ 94.0	$ (228.0)	$ 767.1
Net realized capital gains (losses) on funds withheld assets	18.4	34.6	157.4
Strategic review costs and impacts		(0.9)	70.3
Amortization of reinsurance loss	(123.8)	(14.4)	(12.0)
Other impacts of reinsured business	29.0	(29.4)	(26.4)
Total income tax expense (benefit) related to exited business	$ 17.6	$ (238.1)	$ 956.4

X

- Definition

The tax effect of the amount pertaining to amortization of reinsurance gain (loss).

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

The tax effect of the amount of realized capital gains (losses) on funds withheld assets.

+ References

No definition available.

+ Details

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X

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to exited business.

+ References

No definition available.

+ Details

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X

- Definition

The tax effect of the amount of decrease in pre-tax income due to other impacts of reinsured business.

+ References

No definition available.

+ Details

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X

- Definition

The tax effect of the impact on income of strategic review costs and impacts.

+ References

No definition available.

+ Details

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X

- Definition

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.

+ References

No definition available.

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