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Shareholders' equity - Ordinary Shares, Ordinary Shares B, Cumulative Preference Shares, and Dividend Policy (Details)
 1 Months Ended 12 Months Ended 18 Months Ended
Nov. 30, 2021
€ / shares
Dec. 31, 2022
depositoryReceipt
registeredHolder
€ / shares
shares
Oct. 29, 2022
Dec. 31, 2021
€ / shares
shares
Dec. 31, 2020
shares
Class of Stock [Line Items]          
Common stock, shares, outstanding (in shares)   394,589,411   402,601,613 416,514,034
Number of fractional shares (in shares)   900      
Shares, issued (in shares)         419,497,488
Number of depository receipts | depositoryReceipt   96,566,077      
Maximum share and/or rights issuance, percentage over issued share capital (in percentage)     0.05    
Additional share issuance, percentage over issued share capital (in percentage)     0.05    
Maximum restriction of preemptive rights, percentage over issued share capital (in percentage)     0.05    
Maximum ordinary share purchase price, market price (in percentage)     1.10    
Period in which company to repurchase or cancel cumulative preference shares   20 months      
Dividends declared (in EUR per share) | € / shares   € 5.80      
Dividends paid (in EUR per share) | € / shares € 1.37        
Dividends payable (in EUR per share) | € / shares   € 1.69   € 5.50  
Dividend payable, increase (in percentage)   5.50%      
Cumulative Preferred Stock          
Class of Stock [Line Items]          
Shares, issued (in shares)   0      
United States          
Class of Stock [Line Items]          
Common stock, shares, outstanding (in shares)   87,875,651      
Number of registered holders | registeredHolder   280