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Investments - Fixed Maturities and Equity Securities (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | $ 71,714.6 | $ 72,869.9 |  |
Gross unrealized gains, fixed maturities | 1,970.8 | 5,708.6 |  |
Gross unrealized losses, fixed maturities | 2,251.4 | 408.5 |  |
Allowance, fixed maturities | 20.4 | 15.5 | $ 10.5 | $ 7.4
Fair value, fixed maturities | 71,413.6 | 78,154.5 |  |
Accrued interest receivable | 573.5 | 542.6 |  |
U.S. government and agencies |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 1,933.7 | 1,978.0 |  |
Gross unrealized gains, fixed maturities | 12.8 | 148.0 |  |
Gross unrealized losses, fixed maturities | 76.7 | 37.4 |  |
Fair value, fixed maturities | 1,869.8 | 2,088.6 |  |
Non-U.S. governments |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 836.4 | 851.0 |  |
Gross unrealized gains, fixed maturities | 79.1 | 133.1 |  |
Gross unrealized losses, fixed maturities | 13.8 | 2.1 |  |
Fair value, fixed maturities | 901.7 | 982.0 |  |
States and political subdivisions |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 8,191.6 | 8,290.7 |  |
Gross unrealized gains, fixed maturities | 309.0 | 1,030.3 |  |
Gross unrealized losses, fixed maturities | 266.5 | 16.6 |  |
Fair value, fixed maturities | 8,234.1 | 9,304.4 |  |
Corporate debt securities |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 42,197.1 | 42,139.2 |  |
Gross unrealized gains, fixed maturities | 1,511.5 | 4,044.8 |  |
Gross unrealized losses, fixed maturities | 1,276.8 | 224.5 |  |
Allowance, fixed maturities | 20.0 | 15.1 | 0.9 | 0.9
Fair value, fixed maturities | 42,411.8 | 45,944.4 |  |
Residential mortgage-backed pass-through securities |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 1,978.3 | 3,122.3 |  |
Gross unrealized gains, fixed maturities | 10.0 | 59.0 |  |
Gross unrealized losses, fixed maturities | 82.9 | 28.4 |  |
Fair value, fixed maturities | 1,905.4 | 3,152.9 |  |
Commercial mortgage-backed securities |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 5,625.1 | 5,436.2 |  |
Gross unrealized gains, fixed maturities | 15.0 | 157.8 |  |
Gross unrealized losses, fixed maturities | 216.6 | 31.5 |  |
Allowance, fixed maturities | 0.3 | 0.3 | 7.0 | 4.3
Fair value, fixed maturities | 5,423.2 | 5,562.2 |  |
Collateralized debt obligations |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 3,919.3 | 3,564.7 |  |
Gross unrealized gains, fixed maturities | 2.9 | 4.5 |  |
Gross unrealized losses, fixed maturities | 33.6 | 9.6 |  |
Allowance, fixed maturities |  |  | $ 2.6 | $ 2.2
Fair value, fixed maturities | 3,888.6 | 3,559.6 |  |
Other debt obligations |  |  |  |
Available-for-sale securities |  |  |  |
Amortized cost, fixed maturities | 7,033.1 | 7,487.8 |  |
Gross unrealized gains, fixed maturities | 30.5 | 131.1 |  |
Gross unrealized losses, fixed maturities | 284.5 | 58.4 |  |
Allowance, fixed maturities | 0.1 | 0.1 |  |
Fair value, fixed maturities | $ 6,779.0 | $ 7,560.4 |  |

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