Restructuring and Other - Schedule of Changes in the Restructuring Reserve (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	$ 23.5
Restructuring Charges	4.8	$ 8.0
Foreign Exchange and Other	(0.1)
Cash Paid	(6.9)
Balance at the end	21.3
Employee terminations
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	9.6
Restructuring Charges	3.2
Foreign Exchange and Other	(0.1)
Cash Paid	(5.1)
Balance at the end	7.6
Multi-employer pension plan withdrawal obligations
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	11.0
Restructuring Charges	0.2
Cash Paid	(0.4)
Balance at the end	10.8
Lease terminations and other
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	2.9
Restructuring Charges	1.4
Cash Paid	(1.4)
Balance at the end	$ 2.9