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Information on remuneration - Text Details (Detail)
12 Months Ended
Dec. 31, 2020
EUR (€)
€ / shares
Dec. 31, 2019
EUR (€)
€ / shares
Dec. 31, 2018
EUR (€)
€ / shares
Executive committee [Member]      
Information on remuneration [Line Items]      
Number of members 15 14 13
Key management personnel compensation [1] € 33,170,901 € 29,968,678 € 26,755,003
Number of share options outstanding in share-based payment arrangement 193,300 291,520 333,670
Weighted average exercise price of share options outstanding in share-based payment arrangement | € / shares € 17.31 € 18.61 € 18.99
Board of management [Member]      
Information on remuneration [Line Items]      
Key management personnel compensation € 11,400,000 € 9,700,000 € 9,800,000
Percentage of shares held by board of management 1.00%    
Board of management [Member] | Share-based compensation expenses [Member]      
Information on remuneration [Line Items]      
Directors' remuneration expense € 554,437 0 1,740,520
Supervisory board [Member]      
Information on remuneration [Line Items]      
Key management personnel compensation € 1,314,587 1,202,917 € 1,088,375
Other compensation, product arrangement entitlement   € 2,000  
[1] The Executive Committee consisted of 15 members as per December 31, 2020 (2019: 14 members; 2018: 13 members)