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Investments - Fixed Maturities and Equity Securities (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Available-for-sale securities |  |  |  |  |  |
Amortized cost, fixed maturities | $ 70,912.4 |  | $ 72,869.9 |  |  |
Gross unrealized gains, fixed maturities | 362.3 |  | 5,708.6 |  |  |
Gross unrealized losses, fixed maturities | 8,858.7 |  | 408.5 |  |  |
Allowance, fixed maturities | 6.9 | $ 12.5 | 15.5 | $ 16.3 | $ 8.7 | $ 7.4
Fair value, fixed maturities | 62,409.1 |  | 78,154.5 |  |  |
Accrued interest receivable | 594.2 |  | 542.6 |  |  |
U.S. government and agencies |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |
Amortized cost, fixed maturities | 2,300.1 |  | 1,978.0 |  |  |
Gross unrealized gains, fixed maturities |  |  | 148.0 |  |  |
Gross unrealized losses, fixed maturities | 254.6 |  | 37.4 |  |  |
Fair value, fixed maturities | 2,045.5 |  | 2,088.6 |  |  |
Non-U.S. governments |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |
Amortized cost, fixed maturities | 635.1 |  | 851.0 |  |  |
Gross unrealized gains, fixed maturities | 24.7 |  | 133.1 |  |  |
Gross unrealized losses, fixed maturities | 84.3 |  | 2.1 |  |  |
Fair value, fixed maturities | 575.5 |  | 982.0 |  |  |
States and political subdivisions |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |
Amortized cost, fixed maturities | 7,598.0 |  | 8,290.7 |  |  |
Gross unrealized gains, fixed maturities | 13.0 |  | 1,030.3 |  |  |
Gross unrealized losses, fixed maturities | 1,194.3 |  | 16.6 |  |  |
Fair value, fixed maturities | 6,416.7 |  | 9,304.4 |  |  |
Corporate debt securities |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |
Amortized cost, fixed maturities | 41,897.2 |  | 42,139.2 |  |  |
Gross unrealized gains, fixed maturities | 318.5 |  | 4,044.8 |  |  |
Gross unrealized losses, fixed maturities | 5,598.8 |  | 224.5 |  |  |
Allowance, fixed maturities | 6.8 | $ 12.5 | 15.1 | 15.9 | 8.5 | 0.9
Fair value, fixed maturities | 36,610.1 |  | 45,944.4 |  |  |
Residential mortgage-backed pass-through securities |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |
Amortized cost, fixed maturities | 1,959.9 |  | 3,122.3 |  |  |
Gross unrealized gains, fixed maturities | 0.9 |  | 59.0 |  |  |
Gross unrealized losses, fixed maturities | 223.0 |  | 28.4 |  |  |
Fair value, fixed maturities | 1,737.8 |  | 3,152.9 |  |  |
Commercial mortgage-backed securities |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |
Amortized cost, fixed maturities | 5,642.9 |  | 5,436.2 |  |  |
Gross unrealized gains, fixed maturities | 1.4 |  | 157.8 |  |  |
Gross unrealized losses, fixed maturities | 656.0 |  | 31.5 |  |  |
Allowance, fixed maturities |  |  | 0.3 | 0.3 | $ 0.2 | 4.3
Fair value, fixed maturities | 4,988.3 |  | 5,562.2 |  |  |
Collateralized debt obligations |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |
Amortized cost, fixed maturities | 4,128.9 |  | 3,564.7 |  |  |
Gross unrealized gains, fixed maturities | 1.9 |  | 4.5 |  |  |
Gross unrealized losses, fixed maturities | 136.1 |  | 9.6 |  |  |
Allowance, fixed maturities |  |  |  |  |  | $ 2.2
Fair value, fixed maturities | 3,994.7 |  | 3,559.6 |  |  |
Other debt obligations |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |
Amortized cost, fixed maturities | 6,750.3 |  | 7,487.8 |  |  |
Gross unrealized gains, fixed maturities | 1.9 |  | 131.1 |  |  |
Gross unrealized losses, fixed maturities | 711.6 |  | 58.4 |  |  |
Allowance, fixed maturities | 0.1 |  | 0.1 | $ 0.1 |  |
Fair value, fixed maturities | $ 6,040.5 |  | $ 7,560.4 |  |  |

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