Property, Plant and Equipment - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Property Plant And Equipment [Abstract]
Depreciation expense	$ 22.6	$ 25.4	$ 46.0	$ 53.6
Building and related land sales, non-refundable deposit received	$ 123.3		123.3
Gross proceeds expected from sale including non-refundable deposits			$ 250.0
Entitled to retain percentage of purchase price in liquidation damages			30.00%