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Investments - Net Realized Capital Gains and Losses (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Major components of net realized capital gains (losses) on investments
Fixed maturities, available-for-sale: Gross gains		$ 2.1	$ 22.9	$ 4.2	$ 40.7
Fixed maturities, available-for-sale: Gross losses		(26.9)	(46.8)	(39.0)	(74.8)
Fixed maturities, available-for-sale: Net credit recoveries (losses)		(0.6)	(13.1)	(3.9)	(20.8)
Fixed maturities, available-for-sale: Hedging, net		(1.6)	0.6	(5.7)	(0.6)
Fixed maturities, trading		(3.9)	(4.7)	(2.3)	(5.2)
Equity securities		7.9	18.3	71.1	2.7
Mortgage loans gains (losses)		(31.1)	(71.6)	(47.4)	(74.3)
Derivative net realized capital gains (losses)		39.5	6.5	4.6	(36.4)
Other gains (losses)		(0.6)	15.1	2.3	29.9
Net realized capital gains (losses)	[1]	(15.2)	(72.8)	(16.1)	(138.8)
Unrealized gains (losses) on fixed maturities, trading		(3.7)	(4.4)	(2.6)	(6.3)
Unrealized gains (losses) on fixed maturities, trading, reported in net realized capital gains (losses) on funds withheld assets		0.5	0.8	(2.3)	(1.9)
Unrealized gains (losses) on fixed maturities, trading still held at reported in market risk benefit remeasurement (gain) loss		0.2	(0.7)	0.8	1.1
Unrealized gains (losses) on equity securities		5.7	19.5	63.3	6.8
Unrealized gains (losses) on equity securities reported in net investment income		(6.1)	6.9	12.6	6.3
Unrealized gains (losses) on equity securities reported in net realized capital gains (losses) on funds withheld assets		0.0	0.0	0.0	1.7
Proceeds from sales of investments
Proceeds from sales of investments in fixed maturities, available-for-sale		$ 795.4	$ 1,458.1	$ 1,707.9	$ 3,097.1
[1] Includes realized and unrealized gains (losses). See Note 3, Investments, for further details.

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