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Employee benefits - Reconciliation of Opening and Closing Balances of Net Employee Benefit Plans and Components (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of net defined benefit liability (asset) [line items]    
Balance at January 1 € 276.2 € 237.5
Current service cost 7.9 6.6
Interest cost (income) 1.7 2.7
Post-employment benefit expense, defined benefit plans 9.6 9.3
Demographic assumptions (1.5) 0.0
Financial assumptions 26.8 (29.1)
Actuarial experience (gains) losses (1.8) 0.8
Return on plan assets, excluding interest income (9.6) (0.4)
Exchange adjustments (0.9) 2.8
Gain (loss) on remeasurement, net defined benefit liability (asset) (37.0) 30.7
Acquired through business combinations 3.5 6.6
Contributions by employer (1.2) (0.5)
Contributions by members 0.0 (0.1)
Benefits paid (6.9) (7.3)
Increase (decrease) in net defined benefit liability (asset) resulting from other changes (4.6) (1.3)
Balance at December 31 244.2 276.2
Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Balance at January 1 374.1 323.9
Current service cost 7.9 6.6
Interest cost (income) 2.2 3.7
Post-employment benefit expense, defined benefit plans 10.1 10.3
Demographic assumptions (1.5) 0.0
Financial assumptions 26.8 (29.1)
Actuarial experience (gains) losses (1.8) 0.8
Exchange adjustments (0.3) 2.8
Gain (loss) on remeasurement, net defined benefit liability (asset) (26.8) 31.1
Acquired through business combinations 3.5 18.4
Contributions by employer 0.0  
Contributions by members 0.8 0.4
Benefits paid (9.1) (10.0)
Increase (decrease) in net defined benefit liability (asset) resulting from other changes (4.8) 8.8
Balance at December 31 352.6 374.1
Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Balance at January 1 (97.9) (86.4)
Interest cost (income) (0.5) (1.0)
Post-employment benefit expense, defined benefit plans (0.5) (1.0)
Return on plan assets, excluding interest income (9.6) (0.4)
Exchange adjustments (0.6) 0.0
Gain (loss) on remeasurement, net defined benefit liability (asset) (10.2) (0.4)
Acquired through business combinations 0.0 (11.8)
Contributions by employer (1.2) (0.5)
Contributions by members (0.8) (0.5)
Benefits paid 2.2 2.7
Increase (decrease) in net defined benefit liability (asset) resulting from other changes 0.2 (10.1)
Balance at December 31 € (108.4) € (97.9)