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Investments - Amortization by Expected Maturity (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Amortized cost of fixed maturities available-for-sale
Due in one year or less	$ 2,038.9
Due after one year through five years	10,029.8
Due after five years through ten years	14,248.3
Due after ten years	26,841.8
Subtotal	53,158.8
Mortgage-backed and other asset-backed securities	18,555.8
Amortized cost, fixed maturities	71,714.6	$ 72,869.9
Fair value of fixed maturities available-for-sale
Due in one year or less	2,044.2
Due after one year through five years	10,028.3
Due after five years through ten years	14,240.9
Due after ten years	27,104.0
Subtotal	53,417.4
Mortgage-backed and other asset-backed securities	17,996.2
Fair value, fixed maturities	$ 71,413.6	$ 78,154.5

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