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Business combinations - Additional Information (Details) - EUR (€)
12 Months Ended
Dec. 08, 2020
Mar. 06, 2020
Dec. 31, 2021
Jun. 17, 2021
Mar. 29, 2021
Disclosure of detailed information about business combination [line items]          
Investing cash outflows for payments of deferred consideration     € 12,000,000    
Bottom of Range | Trade Names          
Disclosure of detailed information about business combination [line items]          
Estimated useful lives     3 years    
Top of Range | Trade Names          
Disclosure of detailed information about business combination [line items]          
Estimated useful lives     8 years    
Betty Labs Incorporated          
Disclosure of detailed information about business combination [line items]          
Percentage of voting equity interests acquired         100.00%
Total purchase consideration         € 57,000,000
Goodwill         52,000,000
Acquired intangible assets         2,000,000
Cash and cash equivalents         4,000,000
Deferred tax liabilities         1,000,000
Goodwill expected to be deductible for tax purposes         € 0
Podz, Inc.          
Disclosure of detailed information about business combination [line items]          
Percentage of voting equity interests acquired       100.00%  
Total purchase consideration       € 45,000,000  
Goodwill       44,000,000  
Acquired intangible assets       2,000,000  
Deferred tax liabilities       1,000,000  
Goodwill expected to be deductible for tax purposes       0  
Purchase consideration in cash       36,000,000  
Purchase consideration liability       € 9,000,000  
Bill Simmons Media Group, LLC          
Disclosure of detailed information about business combination [line items]          
Percentage of voting equity interests acquired   100.00%      
Total purchase consideration   € 170,000,000      
Goodwill   140,000,000      
Acquired intangible assets   26,000,000      
Cash and cash equivalents   1,000,000      
Purchase consideration in cash   138,000,000      
Purchase consideration liability   32,000,000      
Purchase consideration liability, undiscounted amount   € 44,000,000      
Purchase consideration liability, payments period   5 years      
Other tangible net assets   € 3,000,000      
Acquisition related costs   3,000,000      
Purchase consideration paid as share based payment awards   12,000,000      
Bill Simmons Media Group, LLC | Bottom of Range | Trade Names          
Disclosure of detailed information about business combination [line items]          
Estimated useful lives     5 years    
Bill Simmons Media Group, LLC | Top of Range          
Disclosure of detailed information about business combination [line items]          
Business combination, compensation expenses   € 47,000,000      
Business combination potential contingent consideration period   5 years      
Bill Simmons Media Group, LLC | Top of Range | Trade Names          
Disclosure of detailed information about business combination [line items]          
Estimated useful lives     8 years    
Megaphone LLC          
Disclosure of detailed information about business combination [line items]          
Percentage of voting equity interests acquired 100.00%        
Goodwill € 164,000,000        
Acquired intangible assets 22,000,000        
Cash and cash equivalents 1,000,000        
Purchase consideration in cash 195,000,000        
Other tangible net assets 6,000,000        
Acquisition related costs 2,000,000        
Purchase consideration paid as share based payment awards 6,000,000        
Trade and other receivables € 14,000,000        
Megaphone LLC | Bottom of Range | Existing Technology and Publisher Relationships          
Disclosure of detailed information about business combination [line items]          
Estimated useful lives     5 years    
Megaphone LLC | Top of Range          
Disclosure of detailed information about business combination [line items]          
Business combination potential contingent consideration period 4 years        
Megaphone LLC | Top of Range | Existing Technology and Publisher Relationships          
Disclosure of detailed information about business combination [line items]          
Estimated useful lives     10 years