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Property, Plant and Equipment - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Property Plant And Equipment [Abstract]          
Depreciation expense $ 30.9 $ 34.6 $ 96.5 $ 105.2  
Building and related land sales, non-refundable deposit received $ 32.1   32.1   $ 12.5
Gross proceeds including deposits from the sale to be expected     $ 250.0