Restructuring Costs - Schedule of Restructuring Costs (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 13.3	$ 17.7
Project Renewal [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	1.5	11.1
Facility and Other Exit Costs, Including Impairments [Member] | Project Renewal [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs		0.3
Employee Severance, Termination Benefits and Relocation Costs [Member] | Project Renewal [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.6	(1.5)
Exited Contractual Commitments and Other [Member] | Project Renewal [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 0.9	$ 12.3