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Investments - Amortization by Expected Maturity (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized cost of fixed maturities available-for-sale |  |
Due in one year or less | $ 2,216.3 |
Due after one year through five years | 10,723.2 |
Due after five years through ten years | 14,142.4 |
Due after ten years | 25,314.6 |
Subtotal | 52,396.5 |
Mortgage-backed and other asset-backed securities | 18,414.6 |
Amortized cost, fixed maturities | 70,811.1 | $ 70,546.8
Fair value of fixed maturities available-for-sale |  |
Due in one year or less | 2,245.6 |
Due after one year through five years | 11,323.9 |
Due after five years through ten years | 15,275.6 |
Due after ten years | 28,899.4 |
Subtotal | 57,744.5 |
Mortgage-backed and other asset-backed securities | 18,812.6 |
Fair value, fixed maturities | $ 76,557.1 | $ 78,710.3

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