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Income from Investments - Net Investment Income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net Investment Income [Line Items]      
Investment income $ 461.6 $ 382.6 $ 383.4
Investment expenses 34.3 34.4 19.1
Net investment income 427.3 348.2 364.3
Proceeds from Sale of Equity Method Investments   0.4  
Realized Investment Gains 68.0 48.3 46.9
Realized Investment Losses (3.2) (10.2) (5.0)
Equity Method Investment, Realized Gain (Loss) on Disposal (0.4)    
Interest on Fixed Income Securities      
Net Investment Income [Line Items]      
Investment income 277.7 289.8 299.4
Dividends on Equity Securities Excluding Alternative Investments      
Net Investment Income [Line Items]      
Investment income 15.9 15.4 22.9
Total Alternative Investments      
Net Investment Income [Line Items]      
Investment income 103.6 27.0 19.0
Equity Method Limited Liability Investments      
Net Investment Income [Line Items]      
Investment income 56.7 4.9 1.0
Limited Liability Investments Included in Equity Securities      
Net Investment Income [Line Items]      
Investment income 46.9 22.1 18.0
Short-term Investments      
Net Investment Income [Line Items]      
Investment income 1.0 5.5 8.2
Loans to Policyholders      
Net Investment Income [Line Items]      
Investment income 21.7 22.1 22.6
Real Estate      
Net Investment Income [Line Items]      
Investment income 9.3 9.6 9.8
Investment expenses 9.7 8.8 9.6
Realized Investment Gains 0.1 1.8 0.0
Realized Investment Losses (0.4)    
Other      
Net Investment Income [Line Items]      
Investment income 32.4 13.2 1.5
Investment expenses $ 24.6 $ 25.6 $ 9.5