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Related party transactions - Summary of Remuneration Explanatory (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Supervisory board [member]      
Disclosure of Remuneration Expenses [Line Items]      
Key management personnel compensation € 1.0 € 1.0 € 1.1
Executive board [member]      
Disclosure of Remuneration Expenses [Line Items]      
Key management personnel compensation 5.8 6.3 5.3
Key management [member]      
Disclosure of Remuneration Expenses [Line Items]      
Key management personnel compensation 26.4 21.5 19.4
Fixed compensation [member]      
Disclosure of Remuneration Expenses [Line Items]      
Key management personnel compensation 14.5 9.4 8.5
Cash based variable compensation [member]      
Disclosure of Remuneration Expenses [Line Items]      
Key management personnel compensation 3.6 3.6 3.1
Share based variable compensation [member]      
Disclosure of Remuneration Expenses [Line Items]      
Key management personnel compensation 3.2 3.3 3.1
Pension contributions [member]      
Disclosure of Remuneration Expenses [Line Items]      
Key management personnel compensation 3.9 4.3 3.7
Other benefits [member]      
Disclosure of Remuneration Expenses [Line Items]      
Key management personnel compensation € 1.2 € 0.9 € 0.9