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Investments - Fixed Maturities (Details) - USD ($) $ in Millions		Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Available-for-sale securities
Amortized cost, fixed maturities		$ 74,871.6	$ 74,048.4
Gross unrealized gains, fixed maturities		769.6	700.3
Gross unrealized losses, fixed maturities		5,907.5	6,479.0
Allowance, fixed maturities		7.0	18.7	$ 2.8	$ 4.7
Fair value, fixed maturities	[1]	69,726.7	68,251.0
Amortized cost, excluding portfolio layer method basis adjustment		74,909.1	74,104.1
Gross unrealized gains, excluding portfolio layer method basis adjustment		732.1	644.6
Gross unrealized losses, excluding portfolio layer method basis adjustment		5,907.5	6,479.0
Allowance, excluding portfolio layer method basis adjustment		7.0	18.7
Fair value, excluding portfolio layer method basis adjustment		69,726.7	68,251.0
Amortized cost, unallocated portfolio layer method basis adjustment		(37.5)	(55.7)
Gross unrealized gains, unallocated portfolio layer method basis adjustment		37.5	55.7
Accrued interest receivable		475.6	647.3
U.S. government and agencies
Available-for-sale securities
Amortized cost, fixed maturities		1,895.1	1,937.4
Gross unrealized gains, fixed maturities		10.2	0.2
Gross unrealized losses, fixed maturities		246.7	299.7
Fair value, fixed maturities		1,658.6	1,637.9
Non-U.S. governments
Available-for-sale securities
Amortized cost, fixed maturities		556.0	567.3
Gross unrealized gains, fixed maturities		16.0	12.9
Gross unrealized losses, fixed maturities		78.0	84.5
Fair value, fixed maturities		494.0	495.7
States and political subdivisions
Available-for-sale securities
Amortized cost, fixed maturities		7,241.4	7,207.8
Gross unrealized gains, fixed maturities		14.6	10.4
Gross unrealized losses, fixed maturities		1,063.1	1,141.7
Fair value, fixed maturities		6,192.9	6,076.5
Corporate debt securities
Available-for-sale securities
Amortized cost, fixed maturities		39,581.0	38,911.1
Gross unrealized gains, fixed maturities		566.4	509.9
Gross unrealized losses, fixed maturities		3,469.1	3,699.9
Allowance, fixed maturities		6.8	18.5	2.7	4.6
Fair value, fixed maturities		36,671.5	35,702.6
Residential mortgage-backed pass-through securities
Available-for-sale securities
Amortized cost, fixed maturities		3,907.2	3,881.3
Gross unrealized gains, fixed maturities		21.9	8.7
Gross unrealized losses, fixed maturities		165.4	215.8
Fair value, fixed maturities		3,763.7	3,674.2
Commercial mortgage-backed securities
Available-for-sale securities
Amortized cost, fixed maturities		5,600.3	5,634.3
Gross unrealized gains, fixed maturities		8.2	4.6
Gross unrealized losses, fixed maturities		392.8	450.9
Fair value, fixed maturities		5,215.7	5,188.0
Collateralized debt obligations
Available-for-sale securities
Amortized cost, fixed maturities		6,613.2	6,518.7
Gross unrealized gains, fixed maturities		29.2	48.0
Gross unrealized losses, fixed maturities		8.2	6.3
Fair value, fixed maturities		6,634.2	6,560.4
Other debt obligations
Available-for-sale securities
Amortized cost, fixed maturities		9,514.9	9,446.2
Gross unrealized gains, fixed maturities		65.6	49.9
Gross unrealized losses, fixed maturities		484.2	580.2
Allowance, fixed maturities		0.2	0.2	$ 0.1	$ 0.1
Fair value, fixed maturities		$ 9,096.1	$ 8,915.7
[1] See Note 4, Investments, for further details relating to the amortized cost of fixed maturities, available-for-sale.

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