v3.25.4
Intangible assets and goodwill - Acquisition or manufacturing costs of intangible assets and goodwill (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period € 1,370,080    
Additions - amortization (141,223) € (137,184) € (152,333)
Balance at the end of the period 1,254,489 1,370,080  
Capitalized development costs 134,644 91,066  
Reconciliation of goodwill      
Balance at the beginning of the period 15,170,652    
Balance at the end of the period 13,571,394 15,170,652  
Intangible assets      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 1,370,080    
Balance at the end of the period 1,254,489 1,370,080  
Amortizable intangible assets      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 1,079,298    
Balance at the end of the period 999,505 1,079,298  
Non-compete agreements      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 9,156    
Balance at the end of the period 5,211 9,156  
Technology      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 328,149    
Balance at the end of the period 243,740 328,149  
Licenses and distribution agreements      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 7,958    
Balance at the end of the period 1,087 7,958  
Customer relationships      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 42,248    
Balance at the end of the period 31,056 42,248  
Intangible assets under construction      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 417,861    
Balance at the end of the period 236,420 417,861  
Internally developed intangibles      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 181,418    
Balance at the end of the period 406,866 181,418  
Other      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 92,508    
Balance at the end of the period 75,125 92,508  
Non-amortizable intangible assets      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 290,782    
Balance at the end of the period 254,984 290,782  
Trade names      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 252,386    
Balance at the end of the period 223,152 252,386  
Management contracts      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 1,042    
Balance at the end of the period 958 1,042  
Emission certificates      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 37,354    
Balance at the end of the period 30,874 37,354  
Goodwill      
Reconciliation of goodwill      
Balance at the beginning of the period 15,170,652    
Balance at the end of the period 13,571,394 15,170,652  
Gross carrying amount | Intangible assets      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 2,266,148 2,785,627  
Foreign currency translation (173,565) 88,100  
Changes in consolidation group 1,611 (7,295)  
Additions 147,017 106,466  
Reclassifications (4,199) (20,155)  
Disposals (137,673) (686,595)  
Balance at the end of the period 2,099,339 2,266,148 2,785,627
Gross carrying amount | Amortizable intangible assets      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 1,973,375 2,517,555  
Foreign currency translation (144,116) 73,265  
Changes in consolidation group 1,611 (7,308)  
Additions 147,017 106,466  
Reclassifications (4,199) (33,828)  
Disposals (130,423) (682,775)  
Balance at the end of the period 1,843,265 1,973,375 2,517,555
Gross carrying amount | Non-compete agreements      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 33,745 328,688  
Foreign currency translation (10,842) 7,074  
Changes in consolidation group 719 (1,905)  
Additions   394  
Reclassifications   (4,301)  
Disposals (3,972) (296,205)  
Disposals of fully-amortized intangibles from prior periods   (280,839)  
Balance at the end of the period 19,650 33,745 328,688
Gross carrying amount | Technology      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 701,385 664,620  
Foreign currency translation (73,616) 37,955  
Reclassifications 432 (73)  
Disposals (173) (1,117)  
Balance at the end of the period 628,028 701,385 664,620
Gross carrying amount | Licenses and distribution agreements      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 75,635 162,687  
Foreign currency translation (3,958) 2,741  
Changes in consolidation group   (4)  
Additions   610  
Reclassifications (3,737) (295)  
Disposals (20,358) (90,104)  
Disposals of fully-amortized intangibles from prior periods   (90,044)  
Balance at the end of the period 47,582 75,635 162,687
Gross carrying amount | Customer relationships      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 74,575 71,484  
Foreign currency translation (7,639) 3,280  
Disposals (18,295) (189)  
Balance at the end of the period 48,641 74,575 71,484
Gross carrying amount | Intangible assets under construction      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 417,861 350,991  
Foreign currency translation (14,486) 8,341  
Additions 133,111 82,252  
Reclassifications (298,043) (22,731)  
Disposals (2,023) (992)  
Balance at the end of the period 236,420 417,861 350,991
Gross carrying amount | Internally developed intangibles      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 425,227 527,282  
Foreign currency translation (24,221) 10,284  
Changes in consolidation group (633) (277)  
Additions 8,710 17,984  
Reclassifications 294,761 20,578  
Disposals (37,235) (150,624)  
Disposals of fully-amortized intangibles from prior periods   (102,244)  
Balance at the end of the period 666,609 425,227 527,282
Gross carrying amount | Other      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 244,947 411,803  
Foreign currency translation (9,354) 3,590  
Changes in consolidation group 1,525 (5,122)  
Additions 5,196 5,226  
Reclassifications 2,388 (27,006)  
Disposals (48,367) (143,544)  
Disposals of fully-amortized intangibles from prior periods   (119,358)  
Balance at the end of the period 196,335 244,947 411,803
Gross carrying amount | Non-amortizable intangible assets      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 292,773 268,072  
Foreign currency translation (29,449) 14,835  
Changes in consolidation group   13  
Reclassifications   13,673  
Disposals (7,250) (3,820)  
Balance at the end of the period 256,074 292,773 268,072
Gross carrying amount | Trade names      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 252,825 225,664  
Foreign currency translation (29,244) 14,788  
Reclassifications   13,673  
Disposals   (1,300)  
Balance at the end of the period 223,581 252,825 225,664
Gross carrying amount | Management contracts      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 2,594 2,534  
Foreign currency translation (205) 47  
Changes in consolidation group   13  
Disposals (770)    
Balance at the end of the period 1,619 2,594 2,534
Gross carrying amount | Emission certificates      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period 37,354 39,874  
Disposals (6,480) (2,520)  
Balance at the end of the period 30,874 37,354 39,874
Gross carrying amount | Goodwill      
Reconciliation of goodwill      
Balance at the beginning of the period 15,671,740 15,247,800  
Foreign currency translation (1,642,863) 812,893  
Changes in consolidation group 14,283 (81,891)  
Reclassifications (94,060) (307,062)  
Balance at the end of the period 13,949,100 15,671,740 15,247,800
Accumulated depreciation / amortization / impairment | Intangible assets      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period (896,068) (1,423,300)  
Foreign currency translation 67,505 (33,892)  
Changes in consolidation group 625 6,598  
Additions - amortization (141,223) (137,184)  
Impairment loss (3,635) (9,666)  
Reclassifications 9 19,758  
Disposals 127,937 681,618  
Balance at the end of the period (844,850) (896,068) (1,423,300)
Accumulated depreciation / amortization / impairment | Amortizable intangible assets      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period (894,077) (1,420,023)  
Foreign currency translation 67,374 (33,878)  
Changes in consolidation group 625 6,598  
Additions - amortization (141,223) (137,184)  
Impairment loss (3,635) (9,666)  
Reclassifications 9 19,758  
Disposals 127,167 680,318  
Balance at the end of the period (843,760) (894,077) (1,420,023)
Accumulated depreciation / amortization / impairment | Non-compete agreements      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period (24,589) (315,649)  
Foreign currency translation 10,092 (6,546)  
Changes in consolidation group   1,900  
Additions - amortization (3,379) (4,689)  
Impairment loss (536) (55)  
Reclassifications   4,275  
Disposals 3,973 296,175  
Disposals of fully-amortized intangibles from prior periods   280,839  
Balance at the end of the period (14,439) (24,589) (315,649)
Accumulated depreciation / amortization / impairment | Technology      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period (373,236) (305,567)  
Foreign currency translation 37,767 (17,469)  
Additions - amortization (48,992) (51,300)  
Reclassifications   (17)  
Disposals 173 1,117  
Balance at the end of the period (384,288) (373,236) (305,567)
Accumulated depreciation / amortization / impairment | Licenses and distribution agreements      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period (67,677) (152,706)  
Foreign currency translation 3,550 (2,493)  
Changes in consolidation group   2  
Additions - amortization (2,726) (2,772)  
Reclassifications   200  
Disposals 20,358 90,092  
Disposals of fully-amortized intangibles from prior periods   90,044  
Balance at the end of the period (46,495) (67,677) (152,706)
Accumulated depreciation / amortization / impairment | Customer relationships      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period (32,327) (26,713)  
Foreign currency translation 3,073 (1,139)  
Additions - amortization (4,504) (4,652)  
Impairment loss (2,118)    
Reclassifications (5)    
Disposals 18,296 177  
Balance at the end of the period (17,585) (32,327) (26,713)
Accumulated depreciation / amortization / impairment | Intangible assets under construction      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period   (339)  
Foreign currency translation   (7)  
Disposals   346  
Balance at the end of the period     (339)
Accumulated depreciation / amortization / impairment | Internally developed intangibles      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period (243,809) (334,404)  
Foreign currency translation 10,279 (5,783)  
Changes in consolidation group 509 151  
Additions - amortization (63,237) (52,695)  
Impairment loss (1) (1,291)  
Reclassifications 95 1,292  
Disposals 36,421 148,921  
Disposals of fully-amortized intangibles from prior periods   102,244  
Balance at the end of the period (259,743) (243,809) (334,404)
Accumulated depreciation / amortization / impairment | Other      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period (152,439) (284,645)  
Foreign currency translation 2,613 (441)  
Changes in consolidation group 116 4,545  
Additions - amortization (18,385) (21,076)  
Impairment loss (980) (8,320)  
Reclassifications (81) 14,008  
Disposals 47,946 143,490  
Disposals of fully-amortized intangibles from prior periods   119,358  
Balance at the end of the period (121,210) (152,439) (284,645)
Accumulated depreciation / amortization / impairment | Non-amortizable intangible assets      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period (1,991) (3,277)  
Foreign currency translation 131 (14)  
Disposals 770 1,300  
Balance at the end of the period (1,090) (1,991) (3,277)
Accumulated depreciation / amortization / impairment | Trade names      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period (439) (1,769)  
Foreign currency translation 10 30  
Disposals   1,300  
Balance at the end of the period (429) (439) (1,769)
Accumulated depreciation / amortization / impairment | Management contracts      
Reconciliation of intangible assets other than goodwill      
Balance at the beginning of the period (1,552) (1,508)  
Foreign currency translation 121 (44)  
Disposals 770    
Balance at the end of the period (661) (1,552) (1,508)
Accumulated depreciation / amortization / impairment | Goodwill      
Reconciliation of goodwill      
Balance at the beginning of the period (501,088) (597,792)  
Foreign currency translation 43,142 (4,723)  
Changes in consolidation group   32,633  
Impairment loss (8,171) (62,189)  
Reclassifications 88,411 130,983  
Balance at the end of the period € (377,706) € (501,088) € (597,792)