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Debt - Summary Of Interest Expense (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instruments [Abstract]      
Interest incurred $ 138.6 $ 155.7 $ 173.8
Less: interest income 1.5 2.7 4.2
Less: interest capitalized as property, plant and equipment 2.0 2.4 1.3
Interest expense, net $ 135.1 $ 150.6 $ 168.3