Property, Plant and Equipment - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Property Plant And Equipment [Abstract]
Depreciation expense	$ 25.5	$ 26.9	$ 53.7	$ 55.2
Building and related land sales, non-refundable deposit received	$ 98.2		98.2
Gross proceeds expected from sale including non-refundable deposits			$ 250.0
Entitled to retain percentage of purchase price in liquidation damages			30.00%