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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 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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