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Investments - Fixed Maturities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | $ 70,781.4 | $ 70,263.1 |  |
Gross unrealized gains, fixed maturities | 773.6 | 512.6 |  |
Gross unrealized losses, fixed maturities | 5,877.2 | 7,878.0 |  |
Allowance, fixed maturities | 4.7 | 7.8 | $ 15.5 | $ 7.4
Fair value, fixed maturities | 65,673.1 | 62,889.9 |  |
Accrued interest receivable | 619.2 | 578.0 |  |
U.S. government and agencies |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 1,745.3 | 1,990.9 |  |
Gross unrealized gains, fixed maturities | 19.3 | 0.1 |  |
Gross unrealized losses, fixed maturities | 235.8 | 251.2 |  |
Fair value, fixed maturities | 1,528.8 | 1,739.8 |  |
Non-U.S. governments |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 550.3 | 611.2 |  |
Gross unrealized gains, fixed maturities | 17.3 | 20.9 |  |
Gross unrealized losses, fixed maturities | 59.7 | 64.8 |  |
Fair value, fixed maturities | 507.9 | 567.3 |  |
States and political subdivisions |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 7,566.4 | 7,355.4 |  |
Gross unrealized gains, fixed maturities | 44.3 | 13.7 |  |
Gross unrealized losses, fixed maturities | 933.9 | 1,136.8 |  |
Fair value, fixed maturities | 6,676.8 | 6,232.3 |  |
Corporate debt securities |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 38,431.3 | 40,370.4 |  |
Gross unrealized gains, fixed maturities | 578.5 | 461.0 |  |
Gross unrealized losses, fixed maturities | 3,195.2 | 4,640.5 |  |
Allowance, fixed maturities | 4.6 | 7.7 | 15.1 | 0.9
Fair value, fixed maturities | 35,810.0 | 36,183.2 |  |
Residential mortgage-backed pass-through securities |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 3,199.7 | 2,420.6 |  |
Gross unrealized gains, fixed maturities | 26.0 | 6.2 |  |
Gross unrealized losses, fixed maturities | 164.6 | 198.1 |  |
Fair value, fixed maturities | 3,061.1 | 2,228.7 |  |
Commercial mortgage-backed securities |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 5,428.6 | 5,572.2 |  |
Gross unrealized gains, fixed maturities | 1.2 | 0.5 |  |
Gross unrealized losses, fixed maturities | 654.3 | 708.1 |  |
Allowance, fixed maturities |  |  | 0.3 | 4.3
Fair value, fixed maturities | 4,775.5 | 4,864.6 |  |
Collateralized debt obligations |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 5,386.0 | 4,705.6 |  |
Gross unrealized gains, fixed maturities | 44.9 | 4.5 |  |
Gross unrealized losses, fixed maturities | 27.2 | 143.7 |  |
Allowance, fixed maturities |  |  |  | $ 2.2
Fair value, fixed maturities | 5,403.7 | 4,566.4 |  |
Other debt obligations |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 8,473.8 | 7,236.8 |  |
Gross unrealized gains, fixed maturities | 42.1 | 5.7 |  |
Gross unrealized losses, fixed maturities | 606.5 | 734.8 |  |
Allowance, fixed maturities | 0.1 | 0.1 | $ 0.1 |
Fair value, fixed maturities | $ 7,909.3 | $ 6,507.6 |  |

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