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Investments - Amortization by Expected Maturity (Details) - USD ($) $ in Millions		Sep. 30, 2025	Dec. 31, 2024
Amortized cost of fixed maturities available-for-sale
Due in one year or less		$ 1,543.8
Due after one year through five years		9,134.7
Due after five years through ten years		9,640.8
Due after ten years		29,104.5
Subtotal		49,423.8
Mortgage-backed and other asset-backed securities		26,046.4
Amortized cost, excluding portfolio layer method basis adjustment		75,470.2	$ 74,104.1
Fair value of fixed maturities available-for-sale
Due in one year or less		1,539.6
Due after one year through five years		9,093.8
Due after five years through ten years		9,616.4
Due after ten years		25,755.8
Subtotal		46,005.6
Mortgage-backed and other asset-backed securities		25,317.3
Fair value, fixed maturities	[1]	$ 71,322.9	$ 68,251.0
[1] See Note 4, Investments, for further details relating to the amortized cost of fixed maturities, available-for-sale.

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