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Supplemental Cash Flow Information - Supplemental Disclosures of Cash Flow Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Supplemental Cash Flow Elements [Abstract]    
Cash paid for interest, net of capitalized amount $ 53.6 $ 53.0
Cash paid for income taxes, net of refunds $ 56.9 $ 4.7