XML 408 R126.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Employee benefits - Additional Information (Details)
€ in Millions
12 Months Ended
Dec. 31, 2019
EUR (€)
shares
Dec. 31, 2018
EUR (€)
shares
Dec. 31, 2017
EUR (€)
Disclosure of defined benefit plans [line items]      
Post-employment benefit expense, defined contribution plans € 9.0 € 9.1 € 8.5
Recognized liability for net defined benefit obligations 233.6 197.5 € 185.4
Estimate of contributions expected to be paid to plan for next annual reporting period € 5.5    
Weighted average duration of defined benefit obligation 19 years 7 months 6 days    
Present value of defined benefit obligation [member]      
Disclosure of defined benefit plans [line items]      
Recognized liability for net defined benefit obligations € 237.5 200.6  
Present value of defined benefit obligation [member] | Other countries      
Disclosure of defined benefit plans [line items]      
Recognized liability for net defined benefit obligations € 3.9 € 3.1  
Restricted Stock1 [Member]      
Disclosure of defined benefit plans [line items]      
Number of other equity instruments granted in share-based payment arrangement | shares 166,427    
Number of other equity instruments exercised or vested in share-based payment arrangement | shares 85,315    
Management Award 2016 [Member] | Restricted Stock1 [Member]      
Disclosure of defined benefit plans [line items]      
Number of other equity instruments exercised or vested in share-based payment arrangement | shares   294,810  
Liabilities From Share-based Payment Transactions, Shares | shares   113,756