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Equity - Share Capital - Class B Shares (Details)
Dec. 31, 2019
item
€ / shares
Dec. 31, 2018
item
€ / shares
Jul. 23, 2012
Jul. 22, 2012
Equity        
Preference shares, annual preferred dividend, minimum (in Euros per share) | € / shares € 0.01 € 0.01    
Exchange ratio     1 2
Interests representing more than 10% of total capital | item 0 0