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General information / summary of general accounting policies (Details) - employee
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Total employees (in FTEs) 44,209 44,027 42,416
Voting rights required for consolidation of subsidiaries 50.00%    
Minimum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Total employees (in FTEs) 44,000