v3.25.4
The Company, basis of presentation and significant accounting policies - The Company's interest in subsidiaries (Details)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Fresenius Medical Care Australia Pty. Ltd.    
Subsidiaries    
Ownership percentage 100.00% 100.00%
Fresenius Medical Care Deutschland GmbH    
Subsidiaries    
Ownership percentage 100.00% 100.00%
Fresenius Medical Care France S.A.S.    
Subsidiaries    
Ownership percentage 100.00% 100.00%
Fresenius Medical Care GmbH    
Subsidiaries    
Ownership percentage 100.00% 100.00%
Fresenius Medical Care Holdings, Inc. (FMCH)    
Subsidiaries    
Ownership percentage 100.00% 100.00%
Fresenius Medical Care Italia S.p.A.    
Subsidiaries    
Ownership percentage 100.00% 100.00%
Fresenius Medical Care Korea Ltd.    
Subsidiaries    
Ownership percentage 100.00% 100.00%
Fresenius Medical Care Ltda.    
Subsidiaries    
Ownership percentage 100.00% 100.00%
Fresenius Medical Care Shanghai Ltd.    
Subsidiaries    
Ownership percentage 100.00% 100.00%
Fresenius Medical Care (U.K.) Ltd.    
Subsidiaries    
Ownership percentage 100.00% 100.00%
National Medical Care of Spain, S.A.U.    
Subsidiaries    
Ownership percentage 100.00% 100.00%
NephroCare Portugal, S.A.    
Subsidiaries    
Ownership percentage 100.00% 100.00%
Fresenius Nephrocare Polska Sp. z.o.o.    
Subsidiaries    
Ownership percentage 100.00% 100.00%
Fresenius Nephrocare Romania S.r.l.    
Subsidiaries    
Ownership percentage 100.00% 100.00%