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Investments - Schedule of Company Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]    
Measurement Alternative $ 11.3 $ 11.8
Equity Method 43.6 38.8
Fair Value 4.6 5.4
Investments 59.5 56.0
Common stock    
Schedule of Equity Method Investments [Line Items]    
Measurement Alternative 0.0 0.0
Equity Method 3.0 2.1
Fair Value 0.0 0.0
Investments 3.0 2.1
Preferred stock and fixed maturities    
Schedule of Equity Method Investments [Line Items]    
Measurement Alternative 0.0 0.5
Equity Method 0.0 2.1
Fair Value 4.6 5.4
Investments 4.6 8.0
Put option    
Schedule of Equity Method Investments [Line Items]    
Measurement Alternative 11.3 11.3
Equity Method 0.0 0.0
Fair Value 0.0 0.0
Investments 11.3 11.3
Investment in securities    
Schedule of Equity Method Investments [Line Items]    
Measurement Alternative 0.0 0.0
Equity Method 40.6 34.6
Fair Value 0.0 0.0
Investments $ 40.6 $ 34.6