Commitments and Contingencies - Narrative (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) Facility	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Committed total of property, plant and equipment expenditure	$ 30.2
Severance payments related to restructuring	7.6
Commitments for outsourced services	59.8
Operating lease commitments	291.3
Minimum non-cancelable sublease rental commitments	23.0
Rent expense	$ 117.6	$ 120.8	$ 123.6
Number of sites cited as potentially responsible party | Facility	3
Number of previously and currently owned sites with potential remediation obligations | Facility	7