Property, Plant and Equipment - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Property Plant And Equipment [Abstract]
Depreciation expense	$ 84.3	$ 88.5	$ 249.7	$ 267.8
Book value of assets held for sale	$ 4.0		$ 4.0		$ 7.2