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Investments - Amortization by Expected Maturity (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized cost of fixed maturities available-for-sale |  |  |
Due in one year or less |  | $ 1,446.9 |
Due after one year through five years |  | 8,318.9 |
Due after five years through ten years |  | 10,010.3 |
Due after ten years |  | 28,436.6 |
Subtotal |  | 48,212.7 |
Mortgage-backed and other asset-backed securities |  | 23,685.1 |
Amortized cost, fixed maturities |  | 71,897.8 | $ 70,781.4
Fair value of fixed maturities available-for-sale |  |  |
Due in one year or less |  | 1,442.3 |
Due after one year through five years |  | 8,107.6 |
Due after five years through ten years |  | 9,450.1 |
Due after ten years |  | 24,340.9 |
Subtotal |  | 43,340.9 |
Mortgage-backed and other asset-backed securities |  | 22,427.9 |
Fair value, fixed maturities | [1] | $ 65,768.8 | $ 65,673.1
[1] | See Note 3, Investments, for further details relating to the amortized cost of fixed maturities, available-for-sale.

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