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Other Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Income Tax Expense (Benefit) $ (5.8) $ 10.9 $ (12.9) $ 22.1
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive loss at beginning of period     2,884.5  
Accumulated other comprehensive loss at end of period $ 3,304.7   $ 3,304.7