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Derivative Financial Instruments - Additional Information (Details) € in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 15, 2017 USD ($) | Apr. 30, 2017 EUR (€) installment | Feb. 28, 2017 USD ($) | Dec. 31, 2016 USD ($) installment | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) item | Sep. 30, 2016 USD ($) | Dec. 31, 2016 EUR (€)
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Foreign currency unrealized gains expected to be reclassified into earnings over next twelve months |  |  |  |  | $ 1,700,000 |  | $ 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 |  |  |  |  |  |  |  |
Swaps maturing September 2019 |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Average fixed interest rate (as a percent) |  |  |  |  | 1.087% |  | 1.087% |  |
Interest Rate Swap Agreements |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative fixed interest rate (as a percent) |  | 0.59% |  | 0.365% |  |  |  |  | 0.365%
Number of annual installments of swap amortization | installment |  | 6 |  | 7 |  |  |  |  |
Beginning date of swap amortization |  | Jun. 30, 2019 |  | Jun. 30, 2017 |  |  |  |  |
Final maturity date of swap amortization |  | Jun. 30, 2024 |  | Jun. 30, 2023 |  |  |  |  |
Carrying value / fair value of derivative liabilities included in other liabilities |  |  |  | $ 100,000 | $ 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 |  | EURIBOR |  |  |  |  |
Treasury Lock | Interest Lock Agreement |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount |  |  | $ 100,000,000 |  |  | $ 150,000,000 |  | $ 150,000,000 |
Derivative agreement date |  |  |  |  |  |  | Sep. 30, 2016 |  |
Derivative agreement second date |  |  |  |  |  |  | Feb. 28, 2017 |  |
Treasury Lock | Interest Lock Agreement | 3.95% senior unsecured notes due 2027 |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Percentage of reduction in 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 |  |  |  |  | 9,700,000 | (1,400,000) | $ 31,700,000 | (10,700,000) |
Designated as Hedging Instrument | Swaps maturing September 2019 |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Floating rate obligation |  |  |  |  | 50,000,000 |  | 50,000,000 |  |
Designated as Hedging Instrument | Interest Rate Swap Agreements |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Floating rate obligation | € |  | € 35.0 |  |  |  |  |  |  | € 25.0
Carrying value / fair value of derivative assets included in other assets |  |  |  | $ 700,000 | 600,000 |  | 600,000 |  |
Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Carrying value / fair value of derivative assets included in other assets |  |  |  |  | 13,500,000 |  | 13,500,000 |  |
Carrying value / fair value of derivative liabilities included in other liabilities |  |  |  | 33,900,000 | 4,300,000 |  | 4,300,000 |  |
Notional amount |  |  |  | 423,800,000 | 317,600,000 |  | 317,600,000 |  |
Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts | Cash Flow Hedging |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Net gain (loss) recognized in gross margin |  |  |  |  | (600,000) | (5,000,000) | (11,400,000) | (13,500,000) |
Not Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Carrying value / fair value of derivative assets included in other assets |  |  |  | 1,000,000 | 100,000 |  | 100,000 |  |
Carrying value / fair value of derivative liabilities included in other liabilities |  |  |  | $ 300,000 | 1,600,000 |  | 1,600,000 |  |
Net gains on derivative contracts not designated as hedges |  |  |  |  | $ 4,000,000 | $ 800,000 | $ 15,400,000 | $ 3,400,000 |

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