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Investments - Fixed Maturities and Equity Securities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale |  |
Amortized Cost, net | $ 5,797.7 | $ 5,788.6
Fair Value | 6,239.3 | 6,345.3
FNMA |  |
Debt Securities, Available-for-sale |  |
Fair Value | 376.7 | 387.1
FHLMC |  |
Debt Securities, Available-for-sale |  |
Fair Value | 326.5 | 344.3
GNMA |  |
Debt Securities, Available-for-sale |  |
Fair Value | 112.1 | 132.3
Fixed maturity securities |  |
Debt Securities, Available-for-sale |  |
Amortized Cost, net | 5,797.7 | 5,788.6
Gross Unrealized Gains | 460.2 | 585.1
Gross Unrealized Losses | 18.6 | 28.4
Fair Value | 6,239.3 | 6,345.3
Mortgage-backed securities |  |
Debt Securities, Available-for-sale |  |
Amortized Cost, net | 612.1 | 605.5
Gross Unrealized Gains | 51.9 | 79.6
Gross Unrealized Losses | 1.5 | 0.3
Fair Value | 662.5 | 684.8
Other, including U.S. Treasury securities |  |
Debt Securities, Available-for-sale |  |
Amortized Cost, net | 342.5 | 395.0
Gross Unrealized Gains | 27.7 | 39.2
Gross Unrealized Losses | 4.3 | 1.0
Fair Value | 365.9 | 433.2
Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Amortized Cost, net | 1,519.7 | 1,612.3
Gross Unrealized Gains | 184.4 | 215.7
Gross Unrealized Losses | 0.7 | 0.5
Fair Value | 1,703.4 | 1,827.5
Foreign government bonds |  |
Debt Securities, Available-for-sale |  |
Amortized Cost, net | 40.2 | 40.2
Gross Unrealized Gains | 3.4 | 4.9
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | 43.6 | 45.1
Corporate bonds |  |
Debt Securities, Available-for-sale |  |
Amortized Cost, net | 2,217.7 | 1,905.2
Gross Unrealized Gains | 176.2 | 221.6
Gross Unrealized Losses | 5.2 | 3.9
Fair Value | 2,388.7 | 2,122.9
Other asset-backed securities |  |
Debt Securities, Available-for-sale |  |
Amortized Cost, net | 1,065.5 | 1,230.4
Gross Unrealized Gains | 16.6 | 24.1
Gross Unrealized Losses | 6.9 | 22.7
Fair Value | $ 1,075.2 | $ 1,231.8

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