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Investments - Fixed Maturities and Equity Securities (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020
--- | --- | --- | --- | --- | ---
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities | $ 70,196.6 |  | $ 70,546.8 |  |
Gross unrealized gains, fixed maturities | 6,566.1 |  | 8,380.0 |  |
Gross unrealized losses, fixed maturities | 303.6 |  | 209.1 |  |
Allowance, fixed maturities | 8.7 | $ 10.5 | 7.4 | $ 7.2 | $ 7.6
Fair value, fixed maturities | 76,450.4 |  | 78,710.3 |  |
Accrued interest receivable | 544.9 |  | 552.5 |  |
U.S. government and agencies |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities | 1,820.0 |  | 1,893.1 |  |
Gross unrealized gains, fixed maturities | 146.5 |  | 228.9 |  |
Gross unrealized losses, fixed maturities | 40.3 |  | 10.5 |  |
Fair value, fixed maturities | 1,926.2 |  | 2,111.5 |  |
Non-U.S. governments |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities | 880.8 |  | 881.6 |  |
Gross unrealized gains, fixed maturities | 152.2 |  | 192.1 |  |
Gross unrealized losses, fixed maturities | 0.1 |  |  |  |
Fair value, fixed maturities | 1,032.9 |  | 1,073.7 |  |
States and political subdivisions |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities | 8,243.8 |  | 8,004.9 |  |
Gross unrealized gains, fixed maturities | 1,042.4 |  | 1,175.5 |  |
Gross unrealized losses, fixed maturities | 27.4 |  | 12.6 |  |
Fair value, fixed maturities | 9,258.8 |  | 9,167.8 |  |
Corporate debt securities |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities | 41,510.7 |  | 41,289.9 |  |
Gross unrealized gains, fixed maturities | 4,714.2 |  | 6,160.9 |  |
Gross unrealized losses, fixed maturities | 169.1 |  | 95.1 |  |
Allowance, fixed maturities | 8.5 | 0.9 | 0.9 | 2.8 | 7.0
Fair value, fixed maturities | 46,047.3 |  | 47,354.8 |  |
Residential mortgage-backed pass-through securities |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities | 2,703.0 |  | 2,857.6 |  |
Gross unrealized gains, fixed maturities | 82.5 |  | 129.4 |  |
Gross unrealized losses, fixed maturities | 11.4 |  | 0.2 |  |
Fair value, fixed maturities | 2,774.1 |  | 2,986.8 |  |
Commercial mortgage-backed securities |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities | 4,930.5 |  | 4,741.2 |  |
Gross unrealized gains, fixed maturities | 234.3 |  | 241.3 |  |
Gross unrealized losses, fixed maturities | 25.1 |  | 35.9 |  |
Allowance, fixed maturities | 0.2 | 7.0 | 4.3 | 3.4 | 0.4
Fair value, fixed maturities | 5,139.5 |  | 4,942.3 |  |
Collateralized debt obligations |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities | 3,607.6 |  | 4,045.9 |  |
Gross unrealized gains, fixed maturities | 8.7 |  | 8.7 |  |
Gross unrealized losses, fixed maturities | 10.8 |  | 24.9 |  |
Allowance, fixed maturities |  | $ 2.6 | 2.2 | $ 1.0 | 0.1
Fair value, fixed maturities | 3,605.5 |  | 4,027.5 |  |
Other debt obligations |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities | 6,500.2 |  | 6,832.6 |  |
Gross unrealized gains, fixed maturities | 185.3 |  | 243.2 |  |
Gross unrealized losses, fixed maturities | 19.4 |  | 29.9 |  |
Allowance, fixed maturities |  |  |  |  | $ 0.1
Fair value, fixed maturities | $ 6,666.1 |  | $ 7,045.9 |  |

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