Restructuring and Other - Schedule of Changes in the Restructuring and MEPP Reserves (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	$ 55.2
Restructuring and Other Charges	17.0
Foreign Exchange and Other	(1.0)
Cash Paid	(7.5)
Balance at the end	63.7
Employee terminations
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	4.8
Restructuring and Other Charges	8.1
Foreign Exchange and Other	(1.1)
Cash Paid	(2.4)
Balance at the end	9.4
Lease terminations and other
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	6.2
Restructuring and Other Charges	8.2
Foreign Exchange and Other	0.1
Cash Paid	(3.5)
Balance at the end	11.0
MEPP withdrawal obligations
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	44.2
Restructuring and Other Charges	0.7
Foreign Exchange and Other	0.0
Cash Paid	(1.6)
Balance at the end	$ 43.3