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Investments - Amortization by Expected Maturity (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Amortized cost of fixed maturities available-for-sale |  |
Due in one year or less | $ 2,180.1 |
Due after one year through five years | 10,883.5 |
Due after five years through ten years | 12,643.7 |
Due after ten years | 23,423.6 |
Subtotal | 49,130.9 |
Mortgage-backed and other asset-backed securities | 18,921.8 |
Amortized cost, fixed maturities | 68,052.7 | $ 65,302.5
Fair value of fixed maturities available-for-sale |  |
Due in one year or less | 2,204.1 |
Due after one year through five years | 11,404.4 |
Due after five years through ten years | 13,692.8 |
Due after ten years | 27,881.0 |
Subtotal | 55,182.3 |
Mortgage-backed and other asset-backed securities | 19,086.9 |
Fair value, fixed maturities | $ 74,269.2 | $ 70,106.2

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