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Investments - Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Total other-than-temporary impairments $ 0.9 $ 0.0
Net realized and unrealized gains on investments    
Debt Securities, Available-for-sale [Line Items]    
Total other-than-temporary impairments 0.8 0.0
Other income (expenses), net    
Debt Securities, Available-for-sale [Line Items]    
Total other-than-temporary impairments $ 0.1 $ 0.0