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Supplementary Financial Information - Schedule of Other Invested Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Summary of Investment Holdings [Line Items]    
Measurement Alternative $ 11.8 $ 11.8
Equity Method 40.9 43.6
Total 52.7 55.4
Common stock    
Summary of Investment Holdings [Line Items]    
Measurement Alternative 0.0 0.0
Equity Method 2.5 2.5
Total 2.5 2.5
Preferred stock    
Summary of Investment Holdings [Line Items]    
Measurement Alternative 0.0 0.0
Equity Method 13.8 15.4
Total 13.8 15.4
Fixed Maturities    
Summary of Investment Holdings [Line Items]    
Measurement Alternative 0.5 0.5
Equity Method 0.0 0.0
Total 0.5 0.5
Other    
Summary of Investment Holdings [Line Items]    
Measurement Alternative 11.3 11.3
Equity Method 24.6 25.7
Total $ 35.9 $ 37.0