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Long-Duration Insurance Contracts - Separate Account Liability Rollforward (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Separate Account, Liability [Roll Forward]
Balance, beginning of year	$ 3,708.8
Balance, end of period	3,568.3	$ 3,708.8
Variable Account Annuities
Separate Account, Liability [Roll Forward]
Balance, beginning of year	3,708.8	3,294.1
Deposits	70.4	266.2
Withdrawals	(76.4)	(290.3)
Net transfers	(11.7)	(21.1)
Fees and charges	(13.6)	(53.3)
Market appreciation (depreciation)	(109.2)	513.2
Other	0.0	0.0
Balance, end of period	$ 3,568.3	$ 3,708.8

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Amount of cash inflow to separate account liability for cash received for deposit.

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Amount of increase (decrease) in separate account liability from performance of investment.

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Amount increase (decrease) in separate account liability from change, classified as other.

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