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Investments - Fixed Maturities and Equity Securities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020
--- | --- | --- | --- | --- | ---
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities | $ 70,811.1 |  | $ 70,546.8 |  |
Gross unrealized gains, fixed maturities | 6,106.5 |  | 8,380.0 |  |
Gross unrealized losses, fixed maturities | 344.2 |  | 209.1 |  |
Allowance, fixed maturities | 16.3 | $ 8.7 | 7.4 | $ 12.1 | $ 7.2
Fair value, fixed maturities | 76,557.1 |  | 78,710.3 |  |
Accrued interest receivable | 570.1 |  | 552.5 |  |
U.S. government and agencies |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities | 1,821.7 |  | 1,893.1 |  |
Gross unrealized gains, fixed maturities | 140.6 |  | 228.9 |  |
Gross unrealized losses, fixed maturities | 40.5 |  | 10.5 |  |
Fair value, fixed maturities | 1,921.8 |  | 2,111.5 |  |
Non-U.S. governments |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities | 906.3 |  | 881.6 |  |
Gross unrealized gains, fixed maturities | 139.3 |  | 192.1 |  |
Gross unrealized losses, fixed maturities | 0.8 |  |  |  |
Fair value, fixed maturities | 1,044.8 |  | 1,073.7 |  |
States and political subdivisions |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities | 8,255.6 |  | 8,004.9 |  |
Gross unrealized gains, fixed maturities | 1,004.3 |  | 1,175.5 |  |
Gross unrealized losses, fixed maturities | 26.9 |  | 12.6 |  |
Fair value, fixed maturities | 9,233.0 |  | 9,167.8 |  |
Corporate debt securities |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities | 41,412.9 |  | 41,289.9 |  |
Gross unrealized gains, fixed maturities | 4,350.9 |  | 6,160.9 |  |
Gross unrealized losses, fixed maturities | 203.0 |  | 95.1 |  |
Allowance, fixed maturities | 15.9 | 8.5 | 0.9 | 6.2 | 2.8
Fair value, fixed maturities | 45,544.9 |  | 47,354.8 |  |
Residential mortgage-backed pass-through securities |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities | 2,816.2 |  | 2,857.6 |  |
Gross unrealized gains, fixed maturities | 82.8 |  | 129.4 |  |
Gross unrealized losses, fixed maturities | 16.4 |  | 0.2 |  |
Fair value, fixed maturities | 2,882.6 |  | 2,986.8 |  |
Commercial mortgage-backed securities |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities | 5,086.5 |  | 4,741.2 |  |
Gross unrealized gains, fixed maturities | 219.2 |  | 241.3 |  |
Gross unrealized losses, fixed maturities | 22.2 |  | 35.9 |  |
Allowance, fixed maturities | 0.3 | $ 0.2 | 4.3 | 4.0 | 3.4
Fair value, fixed maturities | 5,283.2 |  | 4,942.3 |  |
Collateralized debt obligations |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities | 3,569.6 |  | 4,045.9 |  |
Gross unrealized gains, fixed maturities | 7.3 |  | 8.7 |  |
Gross unrealized losses, fixed maturities | 10.6 |  | 24.9 |  |
Allowance, fixed maturities |  |  | 2.2 | $ 1.9 | $ 1.0
Fair value, fixed maturities | 3,566.3 |  | 4,027.5 |  |
Other debt obligations |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, fixed maturities | 6,942.3 |  | 6,832.6 |  |
Gross unrealized gains, fixed maturities | 162.1 |  | 243.2 |  |
Gross unrealized losses, fixed maturities | 23.8 |  | 29.9 |  |
Allowance, fixed maturities | 0.1 |  |  |  |
Fair value, fixed maturities | $ 7,080.5 |  | $ 7,045.9 |  |

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