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Property, Plant and Equipment - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Property Plant And Equipment [Line Items]          
Depreciation expense $ 24.1 $ 30.0 $ 77.8 $ 85.2  
Building and related land sales, non-refundable deposit received 122.3   122.3    
Gross proceeds expected from sale including non-refundable deposits     $ 250.0    
Entitled to retain percentage of purchase price in liquidation damages     30.00%    
Prepaid Expenses and Other Current Assets          
Property Plant And Equipment [Line Items]          
Assets held for sale for continuing operations $ 21.9   $ 21.9   $ 1.5