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INTANGIBLE ASSETS (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, beginning balance € 1,307,388 € 1,138,173  
Intangible assets, ending balance 1,419,699 1,307,388 € 1,138,173
Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, beginning balance 3,692,565 3,236,974  
Additions 487,148 456,894  
Divestitures (2,564) (1,312)  
Reclassifications 5,558 0  
Translation differences and other movements (171) 9  
Intangible assets, ending balance 4,182,536 3,692,565 3,236,974
Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, beginning balance (2,385,177) (2,098,801)  
Reclassifications 5,558    
Translation differences and other movements (1)    
Amortization 372,101 286,376 225,892
Intangible assets, ending balance (2,762,837) (2,385,177) (2,098,801)
Development costs      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, beginning balance 1,264,467    
Intangible assets, ending balance 1,369,895 1,264,467  
Development costs | Externally acquired      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, beginning balance 824,693 744,872  
Intangible assets, ending balance 847,635 824,693 744,872
Development costs | Externally acquired | Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, beginning balance 2,334,817 2,065,450  
Additions 272,975 270,329  
Divestitures 0 (962)  
Reclassifications 0 0  
Translation differences and other movements 0 0  
Intangible assets, ending balance 2,607,792 2,334,817 2,065,450
Development costs | Externally acquired | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, beginning balance (1,510,124) (1,320,578)  
Reclassifications 0    
Translation differences and other movements 0    
Amortization 250,033 189,546  
Intangible assets, ending balance (1,760,157) (1,510,124) (1,320,578)
Development costs | Internally acquired      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, beginning balance 439,774 362,269  
Intangible assets, ending balance 522,260 439,774 362,269
Development costs | Internally acquired | Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, beginning balance 1,007,704 862,015  
Additions 175,405 146,039  
Divestitures 0 (350)  
Reclassifications 5,558 0  
Translation differences and other movements (296) 0  
Intangible assets, ending balance 1,188,371 1,007,704 862,015
Development costs | Internally acquired | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, beginning balance (567,930) (499,746)  
Reclassifications 5,558    
Translation differences and other movements 0    
Amortization 92,623 68,184  
Intangible assets, ending balance (666,111) (567,930) (499,746)
Patents, concessions and licenses      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, beginning balance 32,384 26,047  
Intangible assets, ending balance 35,957 32,384 26,047
Patents, concessions and licenses | Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, beginning balance 291,379 257,889  
Additions 23,849 30,566  
Divestitures 0 0  
Reclassifications 3,399 2,924  
Translation differences and other movements (42) 0  
Intangible assets, ending balance 318,585 291,379 257,889
Patents, concessions and licenses | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, beginning balance (258,995) (231,842)  
Reclassifications (4,283)    
Translation differences and other movements 7    
Amortization 27,923 27,153  
Intangible assets, ending balance (282,628) (258,995) (231,842)
Other intangible assets      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, beginning balance 10,537 4,985  
Intangible assets, ending balance 13,847 10,537 4,985
Other intangible assets | Gross carrying amount      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, beginning balance 58,665 51,620  
Additions 14,919 9,960  
Divestitures (2,564) 0  
Reclassifications (3,399) (2,924)  
Translation differences and other movements 167 9  
Intangible assets, ending balance 67,788 58,665 51,620
Other intangible assets | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, beginning balance (48,128) (46,635)  
Reclassifications 4,283    
Translation differences and other movements (8)    
Amortization 1,522 1,493  
Intangible assets, ending balance € (53,941) € (48,128) € (46,635)