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Derivative financial instruments - Narrative (Details)
Mar. 29, 2018
USD ($)
contract
Term Loan  
Derivative [Line Items]  
Notional amount $ 800,000,000.0
Interest rate swaps  
Derivative [Line Items]  
Number of interest rate swap contracts | contract 2
Fixed rate 2.85%
Interest Rate Swap One  
Derivative [Line Items]  
Notional amount $ 200,000,000.0
Interest Rate Swap Two  
Derivative [Line Items]  
Notional amount $ 600,000,000.0