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Financial instruments - Additional Information (Details) € in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jul. 01, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jul. 01, 2018 USD ($) | Mar. 04, 2019 USD ($) Financial_Institution_Counterparty | Mar. 04, 2019 EUR (€) Financial_Institution_Counterparty | Dec. 31, 2018 USD ($) | Oct. 04, 2018 USD ($) Financial_Institution_Counterparty | Oct. 04, 2018 EUR (€) Financial_Institution_Counterparty
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Foreign currency translation, continuing operations, adjustments, net of tax | $ 12,568,000 | $ (125,705,000) | $ 12,332,000 | $ (44,517,000) |  |  |  |  |
Net revenues | 652,507,000 | 609,866,000 | 1,266,091,000 | 1,197,096,000 |  |  |  |  |
Allowance for doubtful accounts receivable | 9,900,000 |  | 9,900,000 |  |  |  | $ 9,300,000 |  |
Allowance for doubtful accounts receivable, current | 5,200,000 |  | 5,200,000 |  |  |  | 4,400,000 |  |
Cash flow hedging |  |  |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Ineffectiveness related to derivatives | 0 | 0 | 0 | $ 0 |  |  |  |  |
Foreign exchange contract | Designated as Hedging Instrument | Cash flow hedging |  |  |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Total notional amount for all open foreign currency forward contracts | 118,100,000 |  | 118,100,000 |  |  |  | 115,300,000 |  |
Foreign exchange contract | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Gain related to currency forward contracts | 1,500,000 | $ 1,400,000 | 700,000 |  |  |  |  |  |
Loss related to currency forward contracts |  |  | 1,600,000 |  |  |  |  |  |
Total notional amount for all open foreign currency forward contracts | 147,500,000 |  | 147,500,000 |  |  |  | $ 125,900,000 |  |
Cross-currency interest rate swap | Cash flow hedging |  |  |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Foreign currency translation, continuing operations, adjustments, net of tax | $ 700,000 |  | $ 9,800,000 |  |  |  |  |  |
Cross-currency interest rate swap | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Total notional amount for all open foreign currency forward contracts |  |  |  |  | $ 250,000,000 | € 219.2 |  | $ 500,000,000 | € 433.9
Derivative, number of instruments held | Financial_Institution_Counterparty |  |  |  |  | 5 | 5 |  | 6 | 6
Derivative, fixed interest rate |  |  |  |  | 4.875% | 4.875% |  | 4.625% | 4.625%
Derivative, annual interest rate |  |  |  |  | 2.4595% | 2.4595% |  | 1.942% | 1.942%

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