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Employee benefits - Amount recognized in the Consolidated Statement of Comprehensive Income (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Employee Benefits [Abstract]    
Actuarial experience losses € 0.2 € (0.5)
Actuarial losses arising from changes in financial assumptions 43.2 (13.8)
Actuarial gains arising from changes in demographic assumptions 3.0 (1.1)
Actuarial gains arising from the return on plan assets, excluding interest income (5.1) (0.3)
Total actuarial losses 35.3 12.9
Cumulative amount of actuarial losses recognized in Consolidated Statement of Comprehensive Income € 49.5 € 14.2