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Ordinary shares - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
€ / shares
shares
Jun. 30, 2019
€ / shares
shares
Dec. 31, 2018
€ / shares
shares
Dec. 14, 2018
USD ($)
Class of Stock [Line Items]        
Amount of ordinary shares authorized for repurchase | $       $ 100,000,000.0
Ordinary shares purchased under repurchase program (in shares) 304,587 502,766    
Ordinary shares, outstanding (in shares) 130,327,895 130,327,895 130,440,126  
Ordinary shares, par value (in Euros per share) | € / shares € 0.10 € 0.10 € 0.10  
Restricted Shares and Performance Share Awards        
Class of Stock [Line Items]        
Shares outstanding (in shares) 2,796,557 2,796,557    
Restricted Share Units        
Class of Stock [Line Items]        
Shares outstanding (in shares) 18,028 18,028