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Investments - Fixed Maturities (Details) - USD ($) $ in Millions		Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Available-for-sale securities
Amortized cost, fixed maturities		$ 75,451.3		$ 74,048.4
Gross unrealized gains, fixed maturities		1,043.6		700.3
Gross unrealized losses, fixed maturities		5,153.3		6,479.0
Allowance, fixed maturities		18.7	$ 3.1	18.7	$ 2.8	$ 2.9	$ 4.7
Fair value, fixed maturities	[1]	71,322.9		68,251.0
Amortized cost, excluding portfolio layer method basis adjustment		75,470.2		74,104.1
Gross unrealized gains, excluding portfolio layer method basis adjustment		1,024.7		644.6
Gross unrealized losses, excluding portfolio layer method basis adjustment		5,153.3		6,479.0
Allowance, excluding portfolio layer method basis adjustment		18.7		18.7
Fair value, excluding portfolio layer method basis adjustment		71,322.9		68,251.0
Amortized cost, unallocated portfolio layer method basis adjustment		(18.9)		(55.7)
Gross unrealized gains, unallocated portfolio layer method basis adjustment		18.9		55.7
Accrued interest receivable		482.0		647.3
U.S. government and agencies
Available-for-sale securities
Amortized cost, fixed maturities		1,963.1		1,937.4
Gross unrealized gains, fixed maturities		9.4		0.2
Gross unrealized losses, fixed maturities		255.7		299.7
Fair value, fixed maturities		1,716.8		1,637.9
Non-U.S. governments
Available-for-sale securities
Amortized cost, fixed maturities		555.1		567.3
Gross unrealized gains, fixed maturities		18.5		12.9
Gross unrealized losses, fixed maturities		55.5		84.5
Fair value, fixed maturities		518.1		495.7
States and political subdivisions
Available-for-sale securities
Amortized cost, fixed maturities		7,753.8		7,207.8
Gross unrealized gains, fixed maturities		39.4		10.4
Gross unrealized losses, fixed maturities		1,007.7		1,141.7
Fair value, fixed maturities		6,785.5		6,076.5
Corporate debt securities
Available-for-sale securities
Amortized cost, fixed maturities		39,151.8		38,911.1
Gross unrealized gains, fixed maturities		800.7		509.9
Gross unrealized losses, fixed maturities		2,950.0		3,699.9
Allowance, fixed maturities		17.3	2.5	18.5	2.6	2.8	4.6
Fair value, fixed maturities		36,985.2		35,702.6
Residential mortgage-backed pass-through securities
Available-for-sale securities
Amortized cost, fixed maturities		3,806.8		3,881.3
Gross unrealized gains, fixed maturities		41.3		8.7
Gross unrealized losses, fixed maturities		131.5		215.8
Fair value, fixed maturities		3,716.6		3,674.2
Commercial mortgage-backed securities
Available-for-sale securities
Amortized cost, fixed maturities		5,434.0		5,634.3
Gross unrealized gains, fixed maturities		15.9		4.6
Gross unrealized losses, fixed maturities		326.6		450.9
Allowance, fixed maturities		1.1	0.3
Fair value, fixed maturities		5,122.2		5,188.0
Collateralized debt obligations
Available-for-sale securities
Amortized cost, fixed maturities		6,512.1		6,518.7
Gross unrealized gains, fixed maturities		19.5		48.0
Gross unrealized losses, fixed maturities		7.3		6.3
Allowance, fixed maturities			0.1
Fair value, fixed maturities		6,524.3		6,560.4
Other debt obligations
Available-for-sale securities
Amortized cost, fixed maturities		10,293.5		9,446.2
Gross unrealized gains, fixed maturities		80.0		49.9
Gross unrealized losses, fixed maturities		419.0		580.2
Allowance, fixed maturities		0.3	$ 0.2	0.2	$ 0.2	$ 0.1	$ 0.1
Fair value, fixed maturities		$ 9,954.2		$ 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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