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Investments - Amortized Costs and Estimated Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due in One Year or Less | $ 81.4 |
Due after One Year to Five Years | 1,049.7 |
Due after Five Years to Ten Years | 1,570.2 |
Due after Ten Years | 2,878.0 |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 1,350.3 |
Fixed maturities, at amortized cost | 6,929.6 | $ 6,692.7
Fair Value |  |
Due in One Year or Less | 84.6 |
Due after One Year to Five Years | 1,111.0 |
Due after Five Years to Ten Years | 1,691.0 |
Due after Ten Years | 3,219.5 |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 1,373.3 |
Fixed Maturities at Fair Value (Amortized Cost: 2021 - $6,929.6; 2020 - $6,692.7 Allowance for Credit Losses: 2021 - $4.6; 2020 - $3.3) | $ 7,479.4 | $ 7,605.9

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