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Investments - Fixed Maturities (Details) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Available-for-sale securities
Amortized cost, fixed maturities		$ 74,048.4	$ 70,781.4
Gross unrealized gains, fixed maturities		700.3	773.6
Gross unrealized losses, fixed maturities		6,479.0	5,877.2
Allowance, fixed maturities		18.7	4.7	$ 7.8	$ 15.5
Fair value, fixed maturities	[1]	68,251.0	65,673.1
Amortized cost, excluding portfolio layer method basis adjustment		74,104.1
Gross unrealized gains, excluding portfolio layer method basis adjustment		644.6
Gross unrealized losses, excluding portfolio layer method basis adjustment		6,479.0
Allowance, excluding portfolio layer method basis adjustment		18.7
Fair value, excluding portfolio layer method basis adjustment		68,251.0
Amortized cost, unallocated portfolio layer method basis adjustment		(55.7)
Gross unrealized gains, unallocated portfolio layer method basis adjustment		55.7
Accrued interest receivable		647.3	619.2
U.S. government and agencies
Available-for-sale securities
Amortized cost, fixed maturities		1,937.4	1,745.3
Gross unrealized gains, fixed maturities		0.2	19.3
Gross unrealized losses, fixed maturities		299.7	235.8
Fair value, fixed maturities		1,637.9	1,528.8
Non-U.S. governments
Available-for-sale securities
Amortized cost, fixed maturities		567.3	550.3
Gross unrealized gains, fixed maturities		12.9	17.3
Gross unrealized losses, fixed maturities		84.5	59.7
Fair value, fixed maturities		495.7	507.9
States and political subdivisions
Available-for-sale securities
Amortized cost, fixed maturities		7,207.8	7,566.4
Gross unrealized gains, fixed maturities		10.4	44.3
Gross unrealized losses, fixed maturities		1,141.7	933.9
Fair value, fixed maturities		6,076.5	6,676.8
Corporate debt securities
Available-for-sale securities
Amortized cost, fixed maturities		38,911.1	38,431.3
Gross unrealized gains, fixed maturities		509.9	578.5
Gross unrealized losses, fixed maturities		3,699.9	3,195.2
Allowance, fixed maturities		18.5	4.6	7.7	15.1
Fair value, fixed maturities		35,702.6	35,810.0
Residential mortgage-backed pass-through securities
Available-for-sale securities
Amortized cost, fixed maturities		3,881.3	3,199.7
Gross unrealized gains, fixed maturities		8.7	26.0
Gross unrealized losses, fixed maturities		215.8	164.6
Fair value, fixed maturities		3,674.2	3,061.1
Commercial mortgage-backed securities
Available-for-sale securities
Amortized cost, fixed maturities		5,634.3	5,428.6
Gross unrealized gains, fixed maturities		4.6	1.2
Gross unrealized losses, fixed maturities		450.9	654.3
Allowance, fixed maturities					0.3
Fair value, fixed maturities		5,188.0	4,775.5
Collateralized debt obligations
Available-for-sale securities
Amortized cost, fixed maturities		6,518.7	5,386.0
Gross unrealized gains, fixed maturities		48.0	44.9
Gross unrealized losses, fixed maturities		6.3	27.2
Fair value, fixed maturities		6,560.4	5,403.7
Other debt obligations
Available-for-sale securities
Amortized cost, fixed maturities		9,446.2	8,473.8
Gross unrealized gains, fixed maturities		49.9	42.1
Gross unrealized losses, fixed maturities		580.2	606.5
Allowance, fixed maturities		0.2	0.1	$ 0.1	$ 0.1
Fair value, fixed maturities		$ 8,915.7	$ 7,909.3
[1] See Note 4, Investments, for further details relating to the amortized cost of fixed maturities, available-for-sale.

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