v3.26.1
The Company and basis of presentation - Goodwill recognized and Impairment analysis (Details) - EUR (€)
€ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Basis of presentation          
Effective tax rate (as a percent) 23.50% 22.30% 22.50% 23.20%  
Goodwill € 13,967,525   € 13,967,525   € 13,571,394
FME AG shareholders' equity 12,556,711   12,556,711   13,309,832
Market capitalization 10,537,944   10,537,944   11,383,815
Care Delivery          
Basis of presentation          
Goodwill 11,589,098   11,589,098   11,212,997
Excess of recoverable amount over carrying amount € 8,350,088   € 8,350,088   € 6,521,602
Residual value growth 1.00%   1.00%   1.00%
Pre-tax weighted average cost of capital (WACC) 8.14%   8.14%   8.90%
After-tax WACC 6.51%   6.51%   7.21%
Maximum number of projection years     10 years    
Care Delivery | Pre-tax WACC          
Basis of presentation          
Amount by which value assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount 0.0335   0.0335   0.0269
Care Delivery | After-tax WACC          
Basis of presentation          
Amount by which value assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount 0.0263   0.0263   0.0211
Care Delivery | Residual value growth          
Basis of presentation          
Amount by which value assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount (0.1202)   (0.1202)   (0.0853)
Care Delivery | Operating income margin          
Basis of presentation          
Amount by which value assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount (0.0391)   (0.0391)   (0.0318)
Value-Based Care          
Basis of presentation          
Goodwill € 380,181   € 380,181   € 368,663
Excess of recoverable amount over carrying amount € 410,854   € 410,854   € 172,260
Residual value growth 2.80%   2.80%   2.80%
Pre-tax weighted average cost of capital (WACC) 7.73%   7.73%   8.53%
After-tax WACC 6.49%   6.49%   7.20%
Maximum number of projection years     5 years    
Value-Based Care | Pre-tax WACC          
Basis of presentation          
Amount by which value assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount 0.0386   0.0386   0.0171
Value-Based Care | After-tax WACC          
Basis of presentation          
Amount by which value assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount 0.0302   0.0302   0.0132
Value-Based Care | Residual value growth          
Basis of presentation          
Amount by which value assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount (0.0599)   (0.0599)   (0.0236)
Value-Based Care | Operating income margin          
Basis of presentation          
Amount by which value assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount (0.0095)   (0.0095)   (0.0041)
Care Enablement          
Basis of presentation          
Goodwill € 1,998,246   € 1,998,246   € 1,989,734
Excess of recoverable amount over carrying amount € 3,776,899   € 3,776,899   € 2,732,309
Residual value growth 1.00%   1.00%   1.00%
Pre-tax weighted average cost of capital (WACC) 7.68%   7.68%   8.43%
After-tax WACC 6.27%   6.27%   6.42%
Maximum number of projection years     10 years    
Care Enablement | Pre-tax WACC          
Basis of presentation          
Amount by which value assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount 0.0278   0.0278   0.0202
Care Enablement | After-tax WACC          
Basis of presentation          
Amount by which value assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount 0.0221   0.0221   0.0141
Care Enablement | Residual value growth          
Basis of presentation          
Amount by which value assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount (0.0743)   (0.0743)   (0.0474)
Care Enablement | Operating income margin          
Basis of presentation          
Amount by which value assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount (0.037)   (0.037)   (0.0262)