Derivatives and Hedging Activities - Narrative (Detail)			1 Months Ended	6 Months Ended	12 Months Ended
	Mar. 25, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jul. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) derivative	Dec. 31, 2017 USD ($) derivative	Dec. 31, 2016 USD ($) derivative	Dec. 31, 2015 USD ($)	Jun. 30, 2015 EUR (€)	Mar. 31, 2015 USD ($)
Derivative [Line Items]
Unrealized gain on derivative instruments, net of taxes					$ (76,600,000)	$ 19,500,000	$ 3,800,000
Cumulative translation adjustment				$ (694,400,000)	$ (694,400,000)	(701,900,000)
4.50% Senior Notes due September 2023
Derivative [Line Items]
Debt interest rate				4.50%	4.50%			4.50%
Delayed Draw Term Loan A Facility
Derivative [Line Items]
Notional amount of outstanding derivative							100,000,000
Term Loan A Due July 2019
Derivative [Line Items]
Repayments of Term Loan A facility due in 2019	$ 755,200,000		$ 96,300,000	$ 96,300,000
Foreign Currency Forward Contracts
Derivative [Line Items]
Fair Value of (liability) derivatives				(1,600,000)	$ (1,600,000)	4,700,000
Foreign Currency Forward Contracts | Net Investment Hedge
Derivative [Line Items]
Notional amount of outstanding derivative | €								€ 270,000,000
Cumulative translation adjustment before tax				(3,500,000)	(3,500,000)
Cumulative translation adjustment				$ (2,200,000)	$ (2,200,000)
Foreign Currency Forward Contracts | Not Designated as Hedging Instruments
Derivative [Line Items]
Maximum original maturity period of foreign currency forward contracts					12 months
Foreign Currency Forward Contracts | Designated as Hedging Instruments
Derivative [Line Items]
Unrealized gain on derivative instruments, net of taxes					$ (5,000,000)	$ 1,600,000	5,900,000
Net unrealized derivative gain (losses) included in AOCI to be reclassified into earnings in next twelve months					$ 300,000
Maximum original maturity period of foreign currency forward contracts					12 months
Interest Rate Swaps
Derivative [Line Items]
Number of derivative instruments outstanding | derivative				0	0	0
Interest Rate and Currency Swap
Derivative [Line Items]
Notional amount of outstanding derivative							$ 100,000,000
Derivative notional amount settled		$ 20,000,000.0
Amount received on derivative settlement		$ 4,900,000			$ 14,600,000
Fair Value of (liability) derivatives						$ 23,900,000
EUR - Denominated debt | Net Investment Hedge | 4.50% Senior Notes due September 2023
Derivative [Line Items]
Debt instrument face amount | €								€ 400,000,000
Debt interest rate								4.50%
EUR - Denominated debt | Designated as Hedging Instruments | Net Investment Hedge
Derivative [Line Items]
Fair Value of (liability) derivatives				$ 27,800,000	27,800,000
Fair value of (liability) derivatives, after tax				17,200,000	17,200,000
Cross-currency swaps
Derivative [Line Items]
Fair Value of (liability) derivatives						$ (5,300,000)
Cross-currency swaps | Net Investment Hedge
Derivative [Line Items]
Notional amount of outstanding derivative									$ 425,000,000
Cross-currency swaps | Designated as Hedging Instruments | Net Investment Hedge
Derivative [Line Items]
Fair Value of (liability) derivatives				$ 61,800,000	61,800,000
Semi-annual interest settlement resulted in AOCI					17,700,000
Semi-annual interest settlement resulted in AOCI after tax					$ (44,100,000)