Derivative Financial Instruments - Additional Information (Details) € in Millions	1 Months Ended	12 Months Ended
	Feb. 28, 2017	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 EUR (€) item
Derivative [Line Items]
Number of interest rate swaps | item		2			2
Foreign currency unrealized gains expected to be reclassified into earnings over next twelve months		$ 3,500,000
Foreign currency unrealized gains expected to be reclassified into earnings over next twelve months, tax		1,700,000
3.95% senior unsecured notes due 2027
Derivative [Line Items]
Proceeds from issue of senior notes in settlement of derivatives		$ 10,000,000
Interest Rate Swap Agreements
Derivative [Line Items]
Derivative fixed interest rate (as a percent)		0.50%			0.50%
Carrying value / fair value of derivative liabilities included in other liabilities		$ 400,000	$ 100,000
Interest Rate Swap Agreements | U.S. dollars
Derivative [Line Items]
Variable Rate Basis		LIBOR
Interest Rate Swap Agreements | EUR
Derivative [Line Items]
Variable Rate Basis		EURIBOR
Swaps maturing September 2019
Derivative [Line Items]
Average fixed interest rate (as a percent)		1.09%			1.09%
Interest Rate Swap Final Maturity Period One
Derivative [Line Items]
Final maturity date of swap amortization		Jun. 30, 2023
Interest Rate Swap Final Maturity Period Two
Derivative [Line Items]
Final maturity date of swap amortization		Jun. 30, 2024
Treasury Lock | Interest Lock Agreement | 3.95% senior unsecured notes due 2027
Derivative [Line Items]
Percentage of reduction in effective interest rate on senior notes	0.25%	0.25%
Foreign Currency Forward Exchange Contracts
Derivative [Line Items]
Number of credit contingency features | item		0
Foreign Currency Forward Exchange Contracts | Cash Flow Hedging
Derivative [Line Items]
Gains (losses) in other comprehensive income, effective portion		$ 34,600,000	(32,200,000)	$ (26,700,000)
Designated as Hedging Instrument | Interest Rate Swap Agreements
Derivative [Line Items]
Floating rate obligation		50,000,000			€ 56.4
Carrying value / fair value of derivative assets included in other assets		800,000	700,000
Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts
Derivative [Line Items]
Carrying value / fair value of derivative assets included in other assets		14,700,000
Carrying value / fair value of derivative liabilities included in other liabilities		2,800,000	33,900,000
Notional amount		285,400,000	423,800,000
Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts | Cash Flow Hedging
Derivative [Line Items]
Net gain (loss) recognized in gross margin		(11,300,000)	(19,400,000)	(17,800,000)
Not Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts
Derivative [Line Items]
Carrying value / fair value of derivative assets included in other assets		1,300,000
Carrying value / fair value of derivative liabilities included in other liabilities		100,000
Foreign exchange net gain (losses) on derivative contracts not designated as hedges		$ 17,100,000	$ (900,000)	$ (14,900,000)