Segment Information - Reconciliation of Segment Gross Profit to Consolidated Income (Loss) From Continuing Operations Before Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit	$ 139.2	$ 113.1
Selling, general and administrative	(90.0)	(86.8)
Research and development	(5.6)	(6.2)
Interest expense	(10.1)	(13.9)
Other (expense), net	(182.6)	(48.1)
Total loss from continuing operations before income taxes	(149.1)	(41.9)
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit	133.6	104.5
Other gross profit
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit	$ 5.6	$ 8.6