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Reinsurance - Components of Net Realized Capital Gains (Losses) on Funds Withheld Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Reinsurance
Net realized capital gains (losses)	$ (10.2)	$ (73.3)	$ (39.4)	$ (128.7)
Fixed maturities, available-for-sale
Reinsurance
Net realized capital gains (losses)	(11.0)	(66.6)	(41.2)	(123.6)
Fixed maturities, trading
Reinsurance
Net realized capital gains (losses)				(0.1)
Equity securities
Reinsurance
Net realized capital gains (losses)				(1.2)
Mortgage loans
Reinsurance
Net realized capital gains (losses)		(9.2)		(9.2)
Derivatives
Reinsurance
Net realized capital gains (losses)	$ 0.8	$ 2.5	$ 1.8	$ 5.4

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- Definition

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- Definition

Amount of the realized capital gains (losses) on reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder.

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