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Derivative financial instruments - Narrative (Details)
Dec. 31, 2018
USD ($)
Mar. 29, 2018
USD ($)
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