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Commitments and contingencies - Contingencies (Details) - European Commission examination on illegally received state aid
€ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2017
Jul. 31, 2022
EUR (€)
Aug. 31, 2019
EUR (€)
Nov. 30, 2016
EUR (€)
Oct. 31, 2014
EUR (€)
Commitments and contingencies              
Number of state aid decisions appealed to the EU General Court     7        
Number of state aid decisions appealed to the European Court of Justice   4          
Number of state aid decisions appeals to the European Court of Justice discontinued 4            
Pau, Nimes, Angouleme, Altenburg and Zweibrucken              
Commitments and contingencies              
Amount of repayments ordered by the European Commission             € 10.0
Cagliari and Klagenfurt              
Commitments and contingencies              
Amount of repayments ordered by the European Commission           € 13.0  
Montpellier              
Commitments and contingencies              
Amount of repayments ordered by the European Commission         € 9.0    
La Rochelle              
Commitments and contingencies              
Amount of repayments ordered by the European Commission       € 8.4