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Investments - Fixed Maturities and Equity Securities (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | $ 71,413.8 | $ 70,263.1 |  |
Gross unrealized gains, fixed maturities | 626.5 | 512.6 |  |
Gross unrealized losses, fixed maturities | 6,639.3 | 7,878.0 |  |
Allowance, fixed maturities | 4.1 | 7.8 | $ 20.4 | $ 15.5
Fair value, fixed maturities | 65,396.9 | 62,889.9 |  |
Accrued interest receivable | 632.6 | 578.0 |  |
U.S. government and agencies |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 2,041.5 | 1,990.9 |  |
Gross unrealized gains, fixed maturities | 1.5 | 0.1 |  |
Gross unrealized losses, fixed maturities | 213.1 | 251.2 |  |
Fair value, fixed maturities | 1,829.9 | 1,739.8 |  |
Non-U.S. governments |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 584.3 | 611.2 |  |
Gross unrealized gains, fixed maturities | 20.9 | 20.9 |  |
Gross unrealized losses, fixed maturities | 56.0 | 64.8 |  |
Fair value, fixed maturities | 549.2 | 567.3 |  |
States and political subdivisions |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 7,061.5 | 7,355.4 |  |
Gross unrealized gains, fixed maturities | 21.5 | 13.7 |  |
Gross unrealized losses, fixed maturities | 909.6 | 1,136.8 |  |
Fair value, fixed maturities | 6,173.4 | 6,232.3 |  |
Corporate debt securities |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 40,630.6 | 40,370.4 |  |
Gross unrealized gains, fixed maturities | 542.6 | 461.0 |  |
Gross unrealized losses, fixed maturities | 3,872.6 | 4,640.5 |  |
Allowance, fixed maturities | 4.0 | 7.7 | 20.0 | 15.1
Fair value, fixed maturities | 37,296.6 | 36,183.2 |  |
Residential mortgage-backed pass-through securities |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 2,951.5 | 2,420.6 |  |
Gross unrealized gains, fixed maturities | 16.3 | 6.2 |  |
Gross unrealized losses, fixed maturities | 172.9 | 198.1 |  |
Fair value, fixed maturities | 2,794.9 | 2,228.7 |  |
Commercial mortgage-backed securities |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 5,555.1 | 5,572.2 |  |
Gross unrealized gains, fixed maturities | 1.2 | 0.5 |  |
Gross unrealized losses, fixed maturities | 628.5 | 708.1 |  |
Allowance, fixed maturities |  |  | 0.3 | 0.3
Fair value, fixed maturities | 4,927.8 | 4,864.6 |  |
Collateralized debt obligations |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 5,024.6 | 4,705.6 |  |
Gross unrealized gains, fixed maturities | 8.8 | 4.5 |  |
Gross unrealized losses, fixed maturities | 131.1 | 143.7 |  |
Fair value, fixed maturities | 4,902.3 | 4,566.4 |  |
Other debt obligations |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 7,564.7 | 7,236.8 |  |
Gross unrealized gains, fixed maturities | 13.7 | 5.7 |  |
Gross unrealized losses, fixed maturities | 655.5 | 734.8 |  |
Allowance, fixed maturities | 0.1 | 0.1 | $ 0.1 | $ 0.1
Fair value, fixed maturities | $ 6,922.8 | $ 6,507.6 |  |

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