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Investments - Amortization by Expected Maturity (Details) - USD ($) $ in Millions		Mar. 31, 2025	Dec. 31, 2024
Amortized cost of fixed maturities available-for-sale
Due in one year or less		$ 1,623.6
Due after one year through five years		8,966.3
Due after five years through ten years		10,131.2
Due after ten years		28,552.4
Subtotal		49,273.5
Mortgage-backed and other asset-backed securities		25,635.6
Amortized cost, excluding portfolio layer method basis adjustment		74,909.1	$ 74,104.1
Fair value of fixed maturities available-for-sale
Due in one year or less		1,629.8
Due after one year through five years		8,841.9
Due after five years through ten years		9,861.3
Due after ten years		24,684.0
Subtotal		45,017.0
Mortgage-backed and other asset-backed securities		24,709.7
Fair value, fixed maturities	[1]	$ 69,726.7	$ 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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