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Investments - Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Total other-than-temporary impairments $ 2.4 $ 1.7
Net realized and unrealized gains on investments    
Debt Securities, Available-for-sale [Line Items]    
Total other-than-temporary impairments 2.1 1.5
Other income (expenses), net    
Debt Securities, Available-for-sale [Line Items]    
Total other-than-temporary impairments $ 0.3 $ 0.2