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Cash and cash equivalents (Details) - EUR (€)
€ in Millions
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]        
Cash and cash equivalents € 721.4 € 327.5    
Restricted cash 0.1 0.1    
Cash and cash equivalents € 721.5 € 327.6 € 156.9 € 219.2