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Investments - Net Investment Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Investment [Line Items]        
Gross investment income $ 50.5 $ 19.4 $ 101.9 $ 37.2
External investment expense (0.2) 0.0 (0.5) (0.1)
Net investment income 50.3 19.4 101.4 37.1
Fixed maturity securities, available-for-sale at fair value        
Investment [Line Items]        
Gross investment income 43.7 16.2 87.3 31.9
Equity securities        
Investment [Line Items]        
Gross investment income 2.1 0.7 4.6 1.3
Mortgage loans        
Investment [Line Items]        
Gross investment income 3.1 1.6 6.8 2.8
Policy loans        
Investment [Line Items]        
Gross investment income 0.2 0.3 0.6 0.6
Other invested assets        
Investment [Line Items]        
Gross investment income $ 1.4 $ 0.6 $ 2.6 $ 0.6