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Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]      
Cash flow hedges, income tax expense $ 7.0    
Cash flow hedges, income tax benefit   $ (0.3) $ (4.1)