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Supplemental Disclosures of Cash Flow Information - Cash Flow (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash And Cash Equivalents [Abstract]      
Interest paid $ 188.9 $ 169.2 $ 139.2
Income taxes paid, net $ 113.0 $ 22.2 $ 68.1