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Investments - Amortization by Expected Maturity (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Amortized cost of fixed maturities available-for-sale
Due in one year or less	$ 2,320.9
Due after one year through five years	9,617.6
Due after five years through ten years	13,666.9
Due after ten years	28,116.5
Subtotal	53,721.9
Mortgage-backed and other asset-backed securities	18,485.1
Amortized cost, fixed maturities	72,207.0	$ 72,869.9
Fair value of fixed maturities available-for-sale
Due in one year or less	2,315.0
Due after one year through five years	9,370.1
Due after five years through ten years	12,834.0
Due after ten years	25,393.1
Subtotal	49,912.2
Mortgage-backed and other asset-backed securities	17,293.4
Fair value, fixed maturities	$ 67,205.6	$ 78,154.5

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