Restructuring, Impairment and Other - Schedule of Changes in the Restructuring and MEPP Reserves (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($)
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	$ 52.6
Restructuring and Other Charges	41.1
Foreign Exchange and Other	(1.1)
Cash Paid	(34.5)
Balance at the end	58.1
Employee terminations
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	3.4
Restructuring and Other Charges	21.1
Foreign Exchange and Other	0.0
Cash Paid	(13.5)
Balance at the end	11.0
Other
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	8.6
Restructuring and Other Charges	18.1
Foreign Exchange and Other	(1.1)
Cash Paid	(17.8)
Balance at the end	7.8
MEPP withdrawal obligations
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	40.6
Restructuring and Other Charges	1.9
Foreign Exchange and Other	0.0
Cash Paid	(3.2)
Balance at the end	$ 39.3