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Investments - Summary of Fair Value and Amortized Costs (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost, net | $ 6,046.5 | $ 5,797.7
Fair Value | 5,688.0 | 6,239.3
Total |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost, net | 6,046.5 | 5,797.7
Gross Unrealized Gains | 66.5 | 460.2
Gross Unrealized Losses | 425.0 | 18.6
Fair Value | 5,688.0 | 6,239.3
Mortgage-backed securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost, net | 640.4 | 612.1
Gross Unrealized Gains | 5.2 | 51.9
Gross Unrealized Losses | 33.8 | 1.5
Fair Value | 611.8 | 662.5
Other, including U.S. Treasury securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost, net | 406.7 | 342.5
Gross Unrealized Gains | 3.9 | 27.7
Gross Unrealized Losses | 42.0 | 4.3
Fair Value | 368.6 | 365.9
Municipal bonds |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost, net | 1,476.7 | 1,519.7
Gross Unrealized Gains | 30.4 | 184.4
Gross Unrealized Losses | 80.8 | 0.7
Fair Value | 1,426.3 | 1,703.4
Foreign government bonds |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost, net | 41.2 | 40.2
Gross Unrealized Gains | 0.7 | 3.4
Gross Unrealized Losses | 0.5 | 0.0
Fair Value | 41.4 | 43.6
Corporate bonds |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost, net | 2,342.9 | 2,217.7
Gross Unrealized Gains | 21.8 | 176.2
Gross Unrealized Losses | 214.2 | 5.2
Fair Value | 2,150.5 | 2,388.7
Other asset-backed securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost, net | 1,138.6 | 1,065.5
Gross Unrealized Gains | 4.5 | 16.6
Gross Unrealized Losses | 53.7 | 6.9
Fair Value | 1,089.4 | 1,075.2
FNMA |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Fair Value | 349.4 | 376.7
FHLMC |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Fair Value | 293.1 | 326.5
GNMA |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Fair Value | $ 96.7 | $ 112.1

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