Derivative Financial Instruments - Additional Information (Details) € in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) item	Mar. 31, 2017 USD ($)	Mar. 31, 2018 EUR (€) item	Dec. 31, 2017 USD ($)
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	$ 7,700,000
3.95% senior unsecured notes due 2027
Derivative [Line Items]
Proceeds from issue of senior notes in settlement of derivatives	$ 10,000,000
Debt instrument, interest rate	3.95%		3.95%	3.95%
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	$ 300,000			$ 400,000
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%
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 in other comprehensive income, effective portion	$ 8,400,000	$ 3,400,000
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	1,000,000			800,000
Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts
Derivative [Line Items]
Carrying value / fair value of derivative assets included in other assets	18,900,000			14,700,000
Carrying value / fair value of derivative liabilities included in other liabilities	900,000			2,800,000
Notional amount	294,900,000			285,400,000
Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts | Cash Flow Hedging
Derivative [Line Items]
Net gain (loss) recognized in gross margin	2,300,000	(6,600,000)
Not Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts
Derivative [Line Items]
Carrying value / fair value of derivative assets included in other assets	300,000			1,300,000
Carrying value / fair value of derivative liabilities included in other liabilities	300,000			$ 100,000
Foreign exchange net gains on derivative contracts not designated as hedges	$ 2,000,000	$ 1,500,000