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Income from Investments - Net Investment Income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net Investment Income [Line Items]      
Investment income $ 469.8 $ 460.7 $ 461.6
Investment expenses 50.1 38.1 34.3
Net investment income 419.7 422.6 [1] 427.3 [1]
Realized Investment Gains 6.7 41.3 68.0
Realized Investment Losses (13.4) (38.7) (3.2)
Equity Method Investment, Realized Gain (Loss) on Disposal 0.0 0.0 (0.4)
Interest on Fixed Income Securities      
Net Investment Income [Line Items]      
Investment income 346.0 300.1 277.7
Dividends on Equity Securities Excluding Alternative Investments      
Net Investment Income [Line Items]      
Investment income 4.4 6.3 15.9
Total Alternative Investments      
Net Investment Income [Line Items]      
Investment income 29.5 73.4 103.6
Equity Method Limited Liability Investments      
Net Investment Income [Line Items]      
Investment income 10.5 31.3 56.7
Limited Liability Investments Included in Equity Securities      
Net Investment Income [Line Items]      
Investment income 19.0 42.1 46.9
Short-term Investments      
Net Investment Income [Line Items]      
Investment income 18.0 3.7 1.0
Loans to Policyholders      
Net Investment Income [Line Items]      
Investment income 20.9 21.5 21.7
Real Estate      
Net Investment Income [Line Items]      
Investment income 8.9 10.1 9.3
Investment expenses 8.8 7.9 9.7
Realized Investment Gains 0.0 0.0 0.1
Realized Investment Losses 0.0 0.0 (0.4)
Other      
Net Investment Income [Line Items]      
Investment income 12.9 7.7 6.7
Investment expenses 41.3 30.2 24.6
Cash Surrender Value      
Net Investment Income [Line Items]      
Investment income 29.2 37.9 25.7
Derivative      
Net Investment Income [Line Items]      
(Losses) Gains on Hedging Activity $ (11.9) $ 1.7 $ 0.0
[1] As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been recast to reflect application of the new guidance. See Note 2 to the Consolidated Financial Statements for additional information.