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Indemnification assets - Additional Information (Details)
€ / shares in Units, € in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2020
EUR (€)
shares
Dec. 31, 2019
EUR (€)
shares
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Dec. 31, 2019
$ / shares
Dec. 31, 2019
EUR (€)
€ / shares
shares
Dec. 31, 2018
$ / shares
Dec. 31, 2018
EUR (€)
€ / shares
shares
Disclosure of detailed information about business combination [line items]                
Release of indemnified provision € 17.8 € 44.0 € 0.0          
Indemnification assets recognised as of acquisition date       € 73.8   € 35.4   € 79.4
Indemnification Assets Recognised As Of Acquisition Date       6.1       0.0
Remeasurement of indemnification assets   € 44.0 € 0.0 € (8.3)        
Contingent Consideration Arrangements And Indemnification Assets Recognised As of Acquisition Date, Shares Released From Escrow | shares 965,528 5,380,790            
Findus                
Disclosure of detailed information about business combination [line items]                
Indemnification assets recognised as of acquisition date           € 29.8   € 73.8
Shares held in escrow as a result of indemnification asset | shares           1,583,627   6,964,417
Value of shares held in escrow as a result of indemnification asset (price per share) | (per share)         $ 22.37 € 19.96 $ 16.72 € 14.62
Goodfella's Pizza [Member]                
Disclosure of detailed information about business combination [line items]                
Indemnification Assets Recognised As Of Acquisition Date           € 5.6   € 5.6