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Investments - Fixed Maturities (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Available-for-sale securities |  |  |  |  |  |  |
Amortized cost, fixed maturities |  | $ 75,590.1 |  | $ 74,048.4 |  |  |
Gross unrealized gains, fixed maturities |  | 813.1 |  | 700.3 |  |  |
Gross unrealized losses, fixed maturities |  | 5,841.7 |  | 6,479.0 |  |  |
Allowance, fixed maturities |  | 3.1 | $ 7.0 | 18.7 | $ 2.9 | $ 2.8 | $ 4.7
Fair value, fixed maturities | [1] | 70,558.4 |  | 68,251.0 |  |  |
Amortized cost, excluding portfolio layer method basis adjustment |  | 75,615.6 |  | 74,104.1 |  |  |
Gross unrealized gains, excluding portfolio layer method basis adjustment |  | 787.6 |  | 644.6 |  |  |
Gross unrealized losses, excluding portfolio layer method basis adjustment |  | 5,841.7 |  | 6,479.0 |  |  |
Allowance, excluding portfolio layer method basis adjustment |  | 3.1 |  | 18.7 |  |  |
Fair value, excluding portfolio layer method basis adjustment |  | 70,558.4 |  | 68,251.0 |  |  |
Amortized cost, unallocated portfolio layer method basis adjustment |  | (25.5) |  | (55.7) |  |  |
Gross unrealized gains, unallocated portfolio layer method basis adjustment |  | 25.5 |  | 55.7 |  |  |
Accrued interest receivable |  | 464.9 |  | 647.3 |  |  |
U.S. government and agencies |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |
Amortized cost, fixed maturities |  | 1,843.4 |  | 1,937.4 |  |  |
Gross unrealized gains, fixed maturities |  | 9.1 |  | 0.2 |  |  |
Gross unrealized losses, fixed maturities |  | 269.1 |  | 299.7 |  |  |
Fair value, fixed maturities |  | 1,583.4 |  | 1,637.9 |  |  |
Non-U.S. governments |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |
Amortized cost, fixed maturities |  | 554.4 |  | 567.3 |  |  |
Gross unrealized gains, fixed maturities |  | 17.1 |  | 12.9 |  |  |
Gross unrealized losses, fixed maturities |  | 73.7 |  | 84.5 |  |  |
Fair value, fixed maturities |  | 497.8 |  | 495.7 |  |  |
States and political subdivisions |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |
Amortized cost, fixed maturities |  | 7,313.9 |  | 7,207.8 |  |  |
Gross unrealized gains, fixed maturities |  | 13.4 |  | 10.4 |  |  |
Gross unrealized losses, fixed maturities |  | 1,118.7 |  | 1,141.7 |  |  |
Fair value, fixed maturities |  | 6,208.6 |  | 6,076.5 |  |  |
Corporate debt securities |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |
Amortized cost, fixed maturities |  | 39,341.3 |  | 38,911.1 |  |  |
Gross unrealized gains, fixed maturities |  | 623.5 |  | 509.9 |  |  |
Gross unrealized losses, fixed maturities |  | 3,396.9 |  | 3,699.9 |  |  |
Allowance, fixed maturities |  | 2.5 | 6.8 | 18.5 | 2.8 | 2.7 | 4.6
Fair value, fixed maturities |  | 36,565.4 |  | 35,702.6 |  |  |
Residential mortgage-backed pass-through securities |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |
Amortized cost, fixed maturities |  | 3,838.2 |  | 3,881.3 |  |  |
Gross unrealized gains, fixed maturities |  | 22.5 |  | 8.7 |  |  |
Gross unrealized losses, fixed maturities |  | 154.9 |  | 215.8 |  |  |
Fair value, fixed maturities |  | 3,705.8 |  | 3,674.2 |  |  |
Commercial mortgage-backed securities |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |
Amortized cost, fixed maturities |  | 5,507.7 |  | 5,634.3 |  |  |
Gross unrealized gains, fixed maturities |  | 12.1 |  | 4.6 |  |  |
Gross unrealized losses, fixed maturities |  | 351.0 |  | 450.9 |  |  |
Allowance, fixed maturities |  | 0.3 |  |  |  |  |
Fair value, fixed maturities |  | 5,168.5 |  | 5,188.0 |  |  |
Collateralized debt obligations |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |
Amortized cost, fixed maturities |  | 6,827.5 |  | 6,518.7 |  |  |
Gross unrealized gains, fixed maturities |  | 22.3 |  | 48.0 |  |  |
Gross unrealized losses, fixed maturities |  | 10.9 |  | 6.3 |  |  |
Allowance, fixed maturities |  | 0.1 |  |  |  |  |
Fair value, fixed maturities |  | 6,838.8 |  | 6,560.4 |  |  |
Other debt obligations |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |
Amortized cost, fixed maturities |  | 10,389.2 |  | 9,446.2 |  |  |
Gross unrealized gains, fixed maturities |  | 67.6 |  | 49.9 |  |  |
Gross unrealized losses, fixed maturities |  | 466.5 |  | 580.2 |  |  |
Allowance, fixed maturities |  | 0.2 | $ 0.2 | 0.2 | $ 0.1 | $ 0.1 | $ 0.1
Fair value, fixed maturities |  | $ 9,990.1 |  | $ 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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