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Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]        
Derivative instruments, income tax expense (benefit) $ (1.1) $ 3.1 $ (5.2) $ (1.1)