v3.26.1
INTANGIBLE ASSETS - Summary of Intangible Assets Internally Developed and Acquired From Third Party (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance $ 2,502.9 $ 2,331.0 $ 2,246.5
Additions 296.7 265.8 192.1
Amortization (121.0) (126.9) (133.2)
Disposals (2.4) (1.5) (7.6)
Interest on capitalized assets 5.6 2.9  
Amortization contribution from suppliers 27.5 30.2 29.8
Reclassifications 0.1 9.5  
Translation adjustments 11.9 (8.1) 3.4
Ending balance 2,721.3 2,502.9 2,331.0
Goodwill      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 19.2 23.8 22.3
Translation adjustments 2.1 (4.6) 1.5
Ending balance 21.3 19.2 23.8
Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 3,735.8 3,482.8  
Ending balance 4,048.4 3,735.8 3,482.8
Cost | Goodwill      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 19.2 23.8  
Ending balance 21.3 19.2 23.8
Amortization      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (1,232.9) (1,151.8)  
Ending balance (1,327.1) (1,232.9) (1,151.8)
Internally developed | Commercial      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 1,203.0 1,191.5 1,193.3
Additions 32.4 41.0 36.9
Amortization (58.3) (57.7) (58.2)
Amortization contribution from suppliers 17.8 18.7 19.5
Reclassifications   9.5  
Translation adjustments (0.1)    
Ending balance 1,194.8 1,203.0 1,191.5
Internally developed | Commercial | Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 1,361.8 1,311.3  
Ending balance 1,393.5 1,361.8 1,311.3
Internally developed | Commercial | Amortization      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (158.8) (119.8)  
Ending balance (198.7) (158.8) (119.8)
Internally developed | Executive      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 923.4 905.5 881.6
Additions 73.9 60.2 58.8
Amortization (47.4) (53.8) (45.2)
Amortization contribution from suppliers 9.7 11.5 10.3
Translation adjustments (0.3)    
Ending balance 959.3 923.4 905.5
Internally developed | Executive | Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 1,663.6 1,603.4  
Ending balance 1,737.5 1,663.6 1,603.4
Internally developed | Executive | Amortization      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (740.2) (697.9)  
Ending balance (778.2) (740.2) (697.9)
Internally developed | Defense & Security      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 126.4 93.1 80.5
Additions 19.2 39.6 26.1
Amortization (6.5) (4.5) (3.4)
Disposals (1.2) (0.4)  
Reclassifications     (10.9)
Translation adjustments 8.7 (1.4) 0.8
Ending balance 146.6 126.4 93.1
Internally developed | Defense & Security | Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 183.1 145.9  
Ending balance 210.4 183.1 145.9
Internally developed | Defense & Security | Amortization      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (56.7) (52.8)  
Ending balance (63.8) (56.7) (52.8)
Internally developed | Service & Support      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 39.1 31.0 9.0
Additions 0.7 8.1 22.0
Amortization (0.9)    
Ending balance 38.9 39.1 31.0
Internally developed | Service & Support | Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 39.1 31.0  
Ending balance 39.9 39.1 31.0
Internally developed | Service & Support | Amortization      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Ending balance (1.0)    
Internally developed | eVTOL      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 154.7 42.4 0.0
Additions 160.0 109.4 42.4
Interest on capitalized assets 5.6 2.9  
Ending balance 320.3 154.7 42.4
Internally developed | eVTOL | Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 154.7 42.4  
Ending balance 320.3 154.7 42.4
Internally developed | Other      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 8.3 9.6 2.2
Additions 2.7 2.0 3.1
Amortization (1.4) (1.4) (1.5)
Disposals     (6.3)
Reclassifications     10.9
Translation adjustments 1.3 (1.9) 1.2
Ending balance 10.9 8.3 9.6
Internally developed | Other | Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 14.2 14.4  
Ending balance 18.5 14.2 14.4
Internally developed | Other | Amortization      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (5.9) (4.8)  
Ending balance (7.6) (5.9) (4.8)
Acquired from third party | Other      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 6.0 6.5 8.7
Amortization (0.5) (0.7) (0.9)
Disposals     (1.3)
Translation adjustments 0.2 0.2  
Ending balance 5.7 6.0 6.5
Acquired from third party | Other | Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 8.3 9.0  
Ending balance 8.3 8.3 9.0
Acquired from third party | Other | Amortization      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (2.3) (2.5)  
Ending balance (2.6) (2.3) (2.5)
Acquired from third party | Software      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 22.8 27.6 48.9
Additions 7.8 5.5 2.8
Amortization (6.0) (8.8) (24.0)
Disposals (1.2) (1.1)  
Reclassifications 0.1    
Translation adjustments   (0.4) (0.1)
Ending balance 23.5 22.8 27.6
Acquired from third party | Software | Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 291.8 301.6  
Ending balance 298.7 291.8 301.6
Acquired from third party | Software | Amortization      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (269.0) (274.0)  
Ending balance $ (275.2) $ (269.0) $ (274.0)