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Consolidated Statements of Comprehensive Income Parentheticals - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Parentheticals [Abstract]      
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax $ (14.2) $ (21.8) $ 12.9
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax $ (0.9) $ (0.8) $ 0.4