Restructuring, Impairment and Other Charges - Multi-Employer Pension Plan Charges - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost And Reserve [Line Items]
Multi-employer pension plan charges	$ 2.3	$ 2.3	$ 2.3
Accrued liabilities and other	347.4	447.5
Other noncurrent liabilities	203.2	180.2
Multi-Employer Pension Plans
Restructuring Cost And Reserve [Line Items]
Contribution to the multi-employer pension plan	5.1	5.1
MEPP withdrawal obligations
Restructuring Cost And Reserve [Line Items]
Accrued liabilities and other	5.1	5.1
Other noncurrent liabilities	$ 28.9	$ 31.7