Restructuring, Impairment and Other Charges - Other Charges - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Restructuring Cost And Reserve [Line Items]
Other Charges	$ 0.6	$ 0.5
Accrued liabilities	515.1		$ 541.7
Other noncurrent liabilities	187.3		$ 193.1
Multi-employer pension plan withdrawal obligations
Restructuring Cost And Reserve [Line Items]
Other Charges	0.6	$ 0.5
Accrued liabilities	4.9
Other noncurrent liabilities	$ 34.1