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Investments - Amortization by Expected Maturity (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized cost of fixed maturities available-for-sale |  |  |
Due in one year or less |  | $ 1,573.5 |
Due after one year through five years |  | 8,871.9 |
Due after five years through ten years |  | 9,966.7 |
Due after ten years |  | 28,640.9 |
Subtotal |  | 49,053.0 |
Mortgage-backed and other asset-backed securities |  | 26,562.6 |
Amortized cost, excluding portfolio layer method basis adjustment |  | 75,615.6 | $ 74,104.1
Fair value of fixed maturities available-for-sale |  |  |
Due in one year or less |  | 1,577.1 |
Due after one year through five years |  | 8,799.3 |
Due after five years through ten years |  | 9,788.8 |
Due after ten years |  | 24,690.0 |
Subtotal |  | 44,855.2 |
Mortgage-backed and other asset-backed securities |  | 25,703.2 |
Fair value, fixed maturities | [1] | $ 70,558.4 | $ 68,251.0
[1] | See Note 4, Investments, for further details relating to the amortized cost of fixed maturities, available-for-sale.

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