Derivatives and Hedging Activities - Fair Value of Derivative Instruments (Parenthetical) (Detail) € in Millions, $ in Millions	Sep. 30, 2016 USD ($)	Sep. 30, 2016 EUR (€)	Dec. 31, 2015 USD ($)		Dec. 31, 2015 EUR (€)
Offsetting Liabilities [Line Items]
Long-term debt, less current portion	$ 4,000.7		$ 4,266.8	[1]
Gross position, Other Assets	33.6		72.2
Total Derivative Liabilities	(37.9)		(56.8)
Other Current Assets [Member]
Offsetting Liabilities [Line Items]
Gross position, Other Assets	16.7		36.2
Impact of master netting agreements	(1.0)		(24.1)
Net amounts recognized on the Condensed Consolidated Balance Sheet	15.7		12.1
Other Non-current Assets [Member]
Offsetting Liabilities [Line Items]
Gross position, Other Assets	16.9		36.0
Net amounts recognized on the Condensed Consolidated Balance Sheet	16.9		36.0
Other Current Liabilities [Member]
Offsetting Liabilities [Line Items]
Total Derivative Liabilities	(8.7)		(44.8)
Impact of master netting agreements	1.0		24.1
Net amounts recognized on the Condensed Consolidated Balance Sheet	(7.7)		(20.7)
Other Non-current Liabilities [Member]
Offsetting Liabilities [Line Items]
Total Derivative Liabilities	(29.2)		(12.0)
Net amounts recognized on the Condensed Consolidated Balance Sheet	(29.2)		(12.0)
Foreign Currency Forward Contracts [Member]
Offsetting Liabilities [Line Items]
Gross position, Other Assets	10.5		28.2
Total Derivative Liabilities	(8.7)		(44.8)
Foreign Currency Forward Contracts [Member] | Designated as Hedging Instruments [Member]
Offsetting Liabilities [Line Items]
Long-term debt, less current portion	$ 444.8	€ 400.0	$ 432.9		€ 400.0

[1] As of January 1, 2016, we have adopted ASU 2015-03 and ASU 2015-15 with retrospective application. This resulted in a reclassification from other non-current assets to long-term debt, less current portion for debt issuance costs as of December 31, 2015. Refer to Note 2, “Recently Issued Accounting Standards” of the notes to the condensed consolidated financial statements for further details.