v3.10.0.1
Events After the Reporting Period - Additional Information (Details) - EUR (€)
€ in Millions
1 Months Ended 12 Months Ended
Feb. 08, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Feb. 12, 2019
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]          
Repurchases of ordinary shares, Shares   6,427,271 0 0  
Repurchases of ordinary shares   € 77      
Major Ordinary Share Transactions          
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]          
Repurchases of ordinary shares, Shares 548,121        
Repurchases of ordinary shares € 62        
Major business combination | Gimlet Media Inc. and Anchor FM Inc          
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]          
Total purchase consideration         € 300