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Investments - Components of Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Net Investment Income [Line Items] |  |  |  |
Gross investment income | $ 685.0 | $ 454.5 | $ 1,302.6 | $ 874.1
Investment expenses | (7.3) | (6.1) | (13.0) | (11.6)
Net Investment Income | 677.7 | 448.4 | 1,289.6 | 862.5
Available-for-sale Securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 664.8 | 430.7 | 1,257.5 | 823.5
Total equity securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 20.2 | 23.8 | 45.1 | 50.6
Total equity securities | Nonredeemable preferred stocks |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 10.4 | 13.3 | 21.4 | 28.4
Total equity securities | Common equities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 9.8 | 10.5 | 23.7 | 22.2
Total fixed maturities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 647.6 | 405.9 | 1,221.4 | 774.0
Total fixed maturities | U.S. government obligations |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 361.3 | 191.5 | 668.2 | 354.7
Total fixed maturities | State and local government obligations |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 13.4 | 11.6 | 25.8 | 22.2
Total fixed maturities | Foreign government obligations |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 0.0 | 0.0 | 0.1 | 0.1
Total fixed maturities | Corporate debt securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 134.8 | 83.5 | 256.3 | 167.1
Total fixed maturities | Residential mortgage-backed securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 8.0 | 5.8 | 13.4 | 15.0
Total fixed maturities | Commercial mortgage-backed securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 46.1 | 49.2 | 92.5 | 99.2
Total fixed maturities | Other asset-backed securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 81.3 | 61.6 | 159.5 | 110.1
Total fixed maturities | Redeemable preferred stocks |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 2.7 | 2.7 | 5.6 | 5.6
Short-term investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | $ 17.2 | $ 24.8 | $ 36.1 | $ 49.5

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