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Investments - Summary of Fair Value and Amortized Costs (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost, net | $ 5,970.7 | $ 5,797.7
Fair Value | 5,987.4 | 6,239.3
FNMA |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Fair Value | 346.8 | 376.7
FHLMC |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Fair Value | 303.7 | 326.5
GNMA |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Fair Value | 100.7 | 112.1
Total |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost, net | 5,970.7 | 5,797.7
Gross Unrealized Gains | 170.8 | 460.2
Gross Unrealized Losses | 154.1 | 18.6
Fair Value | 5,987.4 | 6,239.3
Mortgage-backed securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost, net | 613.4 | 612.1
Gross Unrealized Gains | 15.2 | 51.9
Gross Unrealized Losses | 13.1 | 1.5
Fair Value | 615.5 | 662.5
Other, including U.S. Treasury securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost, net | 372.5 | 342.5
Gross Unrealized Gains | 11.5 | 27.7
Gross Unrealized Losses | 20.9 | 4.3
Fair Value | 363.1 | 365.9
Municipal bonds |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost, net | 1,530.9 | 1,519.7
Gross Unrealized Gains | 72.2 | 184.4
Gross Unrealized Losses | 23.6 | 0.7
Fair Value | 1,579.5 | 1,703.4
Foreign government bonds |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost, net | 41.3 | 40.2
Gross Unrealized Gains | 1.4 | 3.4
Gross Unrealized Losses | 0.1 | 0.0
Fair Value | 42.6 | 43.6
Corporate bonds |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost, net | 2,308.1 | 2,217.7
Gross Unrealized Gains | 63.4 | 176.2
Gross Unrealized Losses | 75.5 | 5.2
Fair Value | 2,296.0 | 2,388.7
Other asset-backed securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost, net | 1,104.5 | 1,065.5
Gross Unrealized Gains | 7.1 | 16.6
Gross Unrealized Losses | 20.9 | 6.9
Fair Value | $ 1,090.7 | $ 1,075.2

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