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Selected Quarterly Financial Data Significant Quarterly Adjustments (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity Securities, FV-NI, Unrealized Gain $ 18.2 $ 3.7 $ 42.3   $ 15.5   $ 6.8 $ 21.2      
Equity Securities, FV-NI, Unrealized Loss       $ (69.2)   $ (10.3)          
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)     9.5 10.7         $ (0.7) $ 0.0 $ 0.0
Prior years 39.7 14.8 23.6 3.5 11.4 20.2 23.7 22.2 81.6 77.5 66.2
Net income for the period $ 64.0 $ 31.1 $ 59.6 $ (34.9) $ 31.8 $ 32.8 $ 40.7 $ 51.8 $ 119.8 $ 157.1 $ 141.3