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Derivative Financial Instruments - Additional Information (Details) € in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) item | Jun. 30, 2017 USD ($) | Jun. 30, 2018 EUR (€) | Dec. 31, 2017 USD ($)
Derivative [Line Items] |  |  |  |  |  |
Foreign currency unrealized losses expected to be reclassified into earnings over next twelve months | $ (1,100,000) |  | $ (1,100,000) |  |  |
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% | 3.95%
Interest Rate Swap Agreements |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative fixed interest rate (as a percent) | 0.51% |  | 0.51% |  | 0.51% |
Carrying value / fair value of derivative liabilities included in other liabilities | $ 400,000 |  | $ 400,000 |  |  | $ 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% |  | 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 (losses) in other comprehensive income, effective portion | $ (20,900,000) | $ 18,600,000 | $ (12,500,000) | $ 22,000,000 |  |
Designated as Hedging Instrument | Interest Rate Swap Agreements |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Floating rate obligation | 50,000,000 |  | 50,000,000 |  | € 52.9 |
Carrying value / fair value of derivative assets included in other assets | 900,000 |  | 900,000 |  |  | 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 | 5,200,000 |  | 5,200,000 |  |  | 14,700,000
Carrying value / fair value of derivative liabilities included in other liabilities | 9,200,000 |  | 9,200,000 |  |  | 2,800,000
Notional amount | 399,500,000 |  | 399,500,000 |  |  | 285,400,000
Gains (losses) in other comprehensive income, effective portion | (15,800,000) | 13,700,000 | (9,400,000) | 16,300,000 |  |
Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts | Cash Flow Hedging |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Net gain (loss) recognized in gross margin | 1,100,000 | (4,200,000) | 3,400,000 | (10,800,000) |  |
Not Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Carrying value / fair value of derivative assets included in other assets | 600,000 |  | 600,000 |  |  | 1,300,000
Carrying value / fair value of derivative liabilities included in other liabilities | 1,000,000 |  | 1,000,000 |  |  | $ 100,000
Foreign exchange net gains (losses) on derivative contracts not designated as hedges | $ (6,000,000) | $ 9,900,000 | $ (4,000,000) | $ 11,400,000 |  |

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