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Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Statement [Abstract]        
Derivative instruments, income tax expense (benefit) $ 2.8 $ (3.5) $ (2.4) $ (5.2)