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Investments - Fixed Maturities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Available-for-sale securities |  |  |  |  |  |  |
Amortized cost, fixed maturities |  | $ 75,451.3 |  | $ 74,048.4 |  |  |
Gross unrealized gains, fixed maturities |  | 1,043.6 |  | 700.3 |  |  |
Gross unrealized losses, fixed maturities |  | 5,153.3 |  | 6,479.0 |  |  |
Allowance, fixed maturities |  | 18.7 | $ 3.1 | 18.7 | $ 2.8 | $ 2.9 | $ 4.7
Fair value, fixed maturities | [1] | 71,322.9 |  | 68,251.0 |  |  |
Amortized cost, excluding portfolio layer method basis adjustment |  | 75,470.2 |  | 74,104.1 |  |  |
Gross unrealized gains, excluding portfolio layer method basis adjustment |  | 1,024.7 |  | 644.6 |  |  |
Gross unrealized losses, excluding portfolio layer method basis adjustment |  | 5,153.3 |  | 6,479.0 |  |  |
Allowance, excluding portfolio layer method basis adjustment |  | 18.7 |  | 18.7 |  |  |
Fair value, excluding portfolio layer method basis adjustment |  | 71,322.9 |  | 68,251.0 |  |  |
Amortized cost, unallocated portfolio layer method basis adjustment |  | (18.9) |  | (55.7) |  |  |
Gross unrealized gains, unallocated portfolio layer method basis adjustment |  | 18.9 |  | 55.7 |  |  |
Accrued interest receivable |  | 482.0 |  | 647.3 |  |  |
U.S. government and agencies |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |
Amortized cost, fixed maturities |  | 1,963.1 |  | 1,937.4 |  |  |
Gross unrealized gains, fixed maturities |  | 9.4 |  | 0.2 |  |  |
Gross unrealized losses, fixed maturities |  | 255.7 |  | 299.7 |  |  |
Fair value, fixed maturities |  | 1,716.8 |  | 1,637.9 |  |  |
Non-U.S. governments |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |
Amortized cost, fixed maturities |  | 555.1 |  | 567.3 |  |  |
Gross unrealized gains, fixed maturities |  | 18.5 |  | 12.9 |  |  |
Gross unrealized losses, fixed maturities |  | 55.5 |  | 84.5 |  |  |
Fair value, fixed maturities |  | 518.1 |  | 495.7 |  |  |
States and political subdivisions |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |
Amortized cost, fixed maturities |  | 7,753.8 |  | 7,207.8 |  |  |
Gross unrealized gains, fixed maturities |  | 39.4 |  | 10.4 |  |  |
Gross unrealized losses, fixed maturities |  | 1,007.7 |  | 1,141.7 |  |  |
Fair value, fixed maturities |  | 6,785.5 |  | 6,076.5 |  |  |
Corporate debt securities |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |
Amortized cost, fixed maturities |  | 39,151.8 |  | 38,911.1 |  |  |
Gross unrealized gains, fixed maturities |  | 800.7 |  | 509.9 |  |  |
Gross unrealized losses, fixed maturities |  | 2,950.0 |  | 3,699.9 |  |  |
Allowance, fixed maturities |  | 17.3 | 2.5 | 18.5 | 2.6 | 2.8 | 4.6
Fair value, fixed maturities |  | 36,985.2 |  | 35,702.6 |  |  |
Residential mortgage-backed pass-through securities |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |
Amortized cost, fixed maturities |  | 3,806.8 |  | 3,881.3 |  |  |
Gross unrealized gains, fixed maturities |  | 41.3 |  | 8.7 |  |  |
Gross unrealized losses, fixed maturities |  | 131.5 |  | 215.8 |  |  |
Fair value, fixed maturities |  | 3,716.6 |  | 3,674.2 |  |  |
Commercial mortgage-backed securities |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |
Amortized cost, fixed maturities |  | 5,434.0 |  | 5,634.3 |  |  |
Gross unrealized gains, fixed maturities |  | 15.9 |  | 4.6 |  |  |
Gross unrealized losses, fixed maturities |  | 326.6 |  | 450.9 |  |  |
Allowance, fixed maturities |  | 1.1 | 0.3 |  |  |  |
Fair value, fixed maturities |  | 5,122.2 |  | 5,188.0 |  |  |
Collateralized debt obligations |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |
Amortized cost, fixed maturities |  | 6,512.1 |  | 6,518.7 |  |  |
Gross unrealized gains, fixed maturities |  | 19.5 |  | 48.0 |  |  |
Gross unrealized losses, fixed maturities |  | 7.3 |  | 6.3 |  |  |
Allowance, fixed maturities |  |  | 0.1 |  |  |  |
Fair value, fixed maturities |  | 6,524.3 |  | 6,560.4 |  |  |
Other debt obligations |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |
Amortized cost, fixed maturities |  | 10,293.5 |  | 9,446.2 |  |  |
Gross unrealized gains, fixed maturities |  | 80.0 |  | 49.9 |  |  |
Gross unrealized losses, fixed maturities |  | 419.0 |  | 580.2 |  |  |
Allowance, fixed maturities |  | 0.3 | $ 0.2 | 0.2 | $ 0.2 | $ 0.1 | $ 0.1
Fair value, fixed maturities |  | $ 9,954.2 |  | $ 8,915.7 |  |  |
[1] | See Note 4, Investments, for further details relating to the amortized cost of fixed maturities, available-for-sale.

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