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Taxation (Details) - EUR (€)
€ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Taxes [Abstract]        
Tax expense € 11.0 € 10.0 € 41.2 € 39.2