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Investments - Amortization by Expected Maturity (Details) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Amortized cost of fixed maturities available-for-sale
Due in one year or less		$ 1,383.9
Due after one year through five years		8,931.7
Due after five years through ten years		10,158.1
Due after ten years		28,149.9
Subtotal		48,623.6
Mortgage-backed and other asset-backed securities		25,480.5
Amortized cost, fixed maturities		74,048.4	$ 70,781.4
Amortized cost, excluding portfolio layer method basis adjustment		74,104.1
Fair value of fixed maturities available-for-sale
Due in one year or less		1,386.9
Due after one year through five years		8,760.2
Due after five years through ten years		9,748.2
Due after ten years		24,017.4
Subtotal		43,912.7
Mortgage-backed and other asset-backed securities		24,338.3
Fair value, fixed maturities	[1]	$ 68,251.0	$ 65,673.1
[1] See Note 4, Investments, for further details relating to the amortized cost of fixed maturities, available-for-sale.

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