Restructuring and Other - Schedule of Changes in the Restructuring and MEPP Reserves (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	$ 55.2
Restructuring and Other Charges	35.4
Foreign Exchange and Other	(1.3)
Cash Paid	(32.8)
Balance at the end	56.5
Employee terminations
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	4.8
Restructuring and Other Charges	19.5
Foreign Exchange and Other	(1.2)
Cash Paid	(18.4)
Balance at the end	4.7
Other
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	6.2
Restructuring and Other Charges	13.7
Foreign Exchange and Other	0.0
Cash Paid	(9.6)
Balance at the end	10.3
MEPP withdrawal obligations
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	44.2
Restructuring and Other Charges	2.2
Foreign Exchange and Other	(0.1)
Cash Paid	(4.8)
Balance at the end	$ 41.5