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Financial instruments - Additional Information (Details)
€ in Millions
3 Months Ended 9 Months Ended
Sep. 27, 2020
USD ($)
Sep. 29, 2019
USD ($)
Sep. 27, 2020
USD ($)
Sep. 29, 2019
USD ($)
Dec. 31, 2019
USD ($)
Mar. 04, 2019
USD ($)
Financial_Institution_Counterparty
Mar. 04, 2019
EUR (€)
Financial_Institution_Counterparty
Oct. 04, 2018
USD ($)
Financial_Institution_Counterparty
Oct. 04, 2018
EUR (€)
Financial_Institution_Counterparty
Derivatives Fair Value [Line Items]                  
Foreign currency translation gain (loss), continuing operations, adjustments, net of tax $ (20,632,000) $ 39,894,000 $ (20,087,000) $ 27,562,000          
Interest benefit on swaps designated as net investment hedges     14,488,000 13,820,000          
Allowance for doubtful accounts receivable 12,900,000   12,900,000   $ 9,100,000        
Allowance for doubtful accounts receivable, current 8,400,000   8,400,000   5,300,000        
Cash flow hedging                  
Derivatives Fair Value [Line Items]                  
Ineffectiveness related to derivatives 0 0 0 0          
Foreign exchange contract | Not Designated as Hedging Instrument                  
Derivatives Fair Value [Line Items]                  
Loss related to currency forward contracts 900,000 1,900,000 100,000 3,500,000          
Total notional amount for all open foreign currency forward contracts 166,200,000   166,200,000   145,100,000        
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 136,900,000   136,900,000   $ 132,000,000.0        
Cross-currency interest rate swaps | Cash flow hedging                  
Derivatives Fair Value [Line Items]                  
Foreign currency translation gain (loss), continuing operations, adjustments, net of tax 23,200,000 (23,500,000) 5,600,000 (29,400,000)          
Cross-currency interest rate swaps | Not Designated as Hedging Instrument                  
Derivatives Fair Value [Line Items]                  
Interest benefit on swaps designated as net investment hedges $ 4,700,000 $ 5,000,000.0 $ 14,500,000 $ 13,800,000          
Cross-currency interest rate swaps | 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%