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Investments - Amortization by Expected Maturity (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized cost of fixed maturities available-for-sale |  |
Due in one year or less | $ 1,431.1 |
Due after one year through five years | 9,140.4 |
Due after five years through ten years | 10,462.7 |
Due after ten years | 28,432.5 |
Subtotal | 49,466.7 |
Mortgage-backed and other asset-backed securities | 21,514.5 |
Amortized cost, fixed maturities | 70,981.2 | $ 70,263.1
Fair value of fixed maturities available-for-sale |  |
Due in one year or less | 1,414.1 |
Due after one year through five years | 8,777.1 |
Due after five years through ten years | 9,572.0 |
Due after ten years | 24,671.0 |
Subtotal | 44,434.2 |
Mortgage-backed and other asset-backed securities | 19,807.6 |
Fair value, fixed maturities | $ 64,241.8 | $ 62,889.9

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