Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Land and land improvements	$ 134.1	$ 122.4
Machinery and equipment	3,885.3	3,385.4
Buildings	898.6	792.4
Construction in progress	443.1	341.0
Property, plant and equipment	5,361.1	4,641.2
Less accumulated depreciation	(3,388.0)	(2,983.1)
Net of depreciation	$ 1,973.1	$ 1,658.1
Land and Land Improvements
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Useful Life	15 years
Machinery and Equipment | Minimum
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Machinery and Equipment | Maximum
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Useful Life	8 years
Buildings | Minimum
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Buildings | Maximum
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years