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Commitments and contingencies - Commitments (Details) - Sep. 30, 2020 - Revolving credit facility - RCF
EUR (€)
USD ($)
Bank Syndicate RCF    
Debt Instrument [Line Items]    
Revolving credit facility, maximum borrowing capacity € 210,000,000.0 $ 245,900,000
HSBC and LCL Facilities    
Debt Instrument [Line Items]    
Revolving credit facility, maximum borrowing capacity € 21,500,000 $ 25,200,000