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Investments - Fixed Maturities and Equity Securities (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Available-for-sale securities |  |  |
Amortized cost, fixed maturities | $ 69,353.9 |  | $ 65,302.5
Gross unrealized gains, fixed maturities | 7,501.4 |  | 4,927.7
Gross unrealized losses, fixed maturities | 349.1 |  | 124.0
Allowance, fixed maturities | 12.1 | $ 7.2 |
Fair value, fixed maturities | 76,494.1 |  | 70,106.2
Other-than-temporary impairments in AOCI |  |  | 48.4
Accrued interest receivable | 571.9 |  |
Net unrealized gains (losses) on impaired fixed maturities, available-for-sale related to changes in fair value subsequent to the impairment date |  |  | 62.3
U.S. government and agencies |  |  |
Available-for-sale securities |  |  |
Amortized cost, fixed maturities | 1,701.3 |  | 1,627.0
Gross unrealized gains, fixed maturities | 262.8 |  | 100.2
Gross unrealized losses, fixed maturities | 4.0 |  | 3.0
Fair value, fixed maturities | 1,960.1 |  | 1,724.2
Non-U.S. governments |  |  |
Available-for-sale securities |  |  |
Amortized cost, fixed maturities | 849.9 |  | 852.3
Gross unrealized gains, fixed maturities | 182.9 |  | 144.1
Gross unrealized losses, fixed maturities |  |  | 0.2
Fair value, fixed maturities | 1,032.8 |  | 996.2
States and political subdivisions |  |  |
Available-for-sale securities |  |  |
Amortized cost, fixed maturities | 7,870.4 |  | 6,857.1
Gross unrealized gains, fixed maturities | 1,109.0 |  | 644.5
Gross unrealized losses, fixed maturities | 11.6 |  | 11.6
Fair value, fixed maturities | 8,967.8 |  | 7,490.0
Corporate debt securities |  |  |
Available-for-sale securities |  |  |
Amortized cost, fixed maturities | 40,363.8 |  | 36,993.1
Gross unrealized gains, fixed maturities | 5,341.2 |  | 3,706.5
Gross unrealized losses, fixed maturities | 202.0 |  | 52.2
Allowance, fixed maturities | 6.2 | 2.8 |
Fair value, fixed maturities | 45,496.8 |  | 40,647.4
Residential mortgage-backed pass-through securities |  |  |
Available-for-sale securities |  |  |
Amortized cost, fixed maturities | 2,906.3 |  | 2,913.9
Gross unrealized gains, fixed maturities | 136.4 |  | 72.3
Gross unrealized losses, fixed maturities | 0.4 |  | 3.8
Fair value, fixed maturities | 3,042.3 |  | 2,982.4
Commercial mortgage-backed securities |  |  |
Available-for-sale securities |  |  |
Amortized cost, fixed maturities | 4,719.4 |  | 4,746.6
Gross unrealized gains, fixed maturities | 196.8 |  | 127.6
Gross unrealized losses, fixed maturities | 40.8 |  | 24.0
Allowance, fixed maturities | 4.0 | 3.4 |
Fair value, fixed maturities | 4,871.4 |  | 4,850.2
Other-than-temporary impairments in AOCI |  |  | 15.8
Collateralized debt obligations |  |  |
Available-for-sale securities |  |  |
Amortized cost, fixed maturities | 3,779.4 |  | 3,226.7
Gross unrealized gains, fixed maturities | 6.1 |  | 2.9
Gross unrealized losses, fixed maturities | 46.4 |  | 14.3
Allowance, fixed maturities | 1.9 | $ 1.0 |
Fair value, fixed maturities | 3,737.2 |  | 3,215.3
Other-than-temporary impairments in AOCI |  |  | 0.9
Other debt obligations |  |  |
Available-for-sale securities |  |  |
Amortized cost, fixed maturities | 7,163.4 |  | 8,085.8
Gross unrealized gains, fixed maturities | 266.2 |  | 129.6
Gross unrealized losses, fixed maturities | 43.9 |  | 14.9
Fair value, fixed maturities | $ 7,385.7 |  | 8,200.5
Other-than-temporary impairments in AOCI |  |  | $ 31.7

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- Definition The net amount of gross unrealized gains (losses) for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. This amount specifically relates to net unrealized gains (losses) since the time of impairment for securities for which the noncredit portion of the impairment loss was recognized in other comprehensive income. + References No definition available. + Details
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