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Investment Securities (Net Investment Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investment income:      
Total investment income $ 62.0 $ 58.5 $ 34.5
Third-party investment expenses (3.0) (2.5) (2.4)
Net investment income, pre-tax 59.0 56.0 32.1
Fixed maturity investments      
Investment income:      
Total investment income 35.1 44.9 28.5
Short-term investments      
Investment income:      
Total investment income 8.0 1.8 0.9
Common Stock      
Investment income:      
Total investment income 15.1 10.6 4.0
Other long-term investments      
Investment income:      
Total investment income $ 3.8 $ 1.2 $ 1.1