Derivative Financial Instruments - Additional Information (Detail) In Millions, unless otherwise specified	12 Months Ended	1 Months Ended	12 Months Ended			12 Months Ended
	Dec. 31, 2014 USD ($)	Jul. 31, 2014 3 3/4% Senior Notes Due in October 2021	Dec. 31, 2014 3 3/4% Senior Notes Due in October 2021 Euro-Denominated EUR (€)	Dec. 31, 2014 Net Investment Hedging 3 3/4% Senior Notes Due in October 2021 USD ($)	Dec. 31, 2014 Interest Rate Swap Fair value derivatives USD ($)	Dec. 31, 2014 Swap Cash flow derivatives USD ($)	Dec. 31, 2014 Forward-Starting Swaps Cash flow derivatives Effective Commencing December Thirty First Two Thousand And Fifteen USD ($)	Dec. 31, 2014 Foreign Exchange Contract Cash flow derivatives USD ($)	Dec. 31, 2014 Foreign Exchange Contract Cash flow derivatives Derivatives that are not designated as effective hedges USD ($)	Dec. 31, 2014 Commodity Contract Derivatives that are not designated as effective hedges USD ($)
Derivative [Line Items]
Notional amount					$ 650	$ 850	$ 350	$ 467	$ 369	$ 24
Derivative weighted average basis spread on variable rate					6.05%
Effective date of swap agreement							December 31, 2015
Derivative maturity date						June 2020		June 2016	December 2015	December 2015
Weighted average fixed rate of interest swaps						1.30%
Deferred net gains within AOCI expected to be reclassified to earnings over the next twelve months	24.7
Debt instrument, principal balance designated as investment hedge			300
Interest rate of debt instrument		3.75%	3.75%
Senior notes, maturity period		2021-10	2021-10
Deferred gain (loss) on net investment hedge recorded in AOCI, net of tax				$ 28.3