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Investments - Fixed Maturities and Equity Securities (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost, net | $ 5,756.9 | $ 5,797.7
Gross Unrealized Gains | 35.0 | 460.2
Gross Unrealized Losses | 606.9 | 18.6
Fair Value | 5,185.0 | 6,239.3
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost, net | 638.2 | 612.1
Gross Unrealized Gains | 1.3 | 51.9
Gross Unrealized Losses | 69.1 | 1.5
Fair Value | 570.4 | 662.5
Other, including U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost, net | 410.0 | 342.5
Gross Unrealized Gains | 0.5 | 27.7
Gross Unrealized Losses | 67.8 | 4.3
Fair Value | 342.7 | 365.9
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost, net | 1,380.9 | 1,519.7
Gross Unrealized Gains | 16.9 | 184.4
Gross Unrealized Losses | 128.1 | 0.7
Fair Value | 1,269.7 | 1,703.4
Foreign government bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost, net | 35.1 | 40.2
Gross Unrealized Gains | 0.0 | 3.4
Gross Unrealized Losses | 1.6 | 0.0
Fair Value | 33.5 | 43.6
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost, net | 2,161.2 | 2,217.7
Gross Unrealized Gains | 12.7 | 176.2
Gross Unrealized Losses | 272.2 | 5.2
Fair Value | 1,901.7 | 2,388.7
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost, net | 1,131.5 | 1,065.5
Gross Unrealized Gains | 3.6 | 16.6
Gross Unrealized Losses | 68.1 | 6.9
Fair Value | 1,067.0 | 1,075.2
FNMA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 330.8 | 376.7
FHLMC |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 273.3 | 326.5
GNMA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 86.2 | $ 112.1

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