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Intangible Assets - Summary of Intangible Assets Internally Developed and Acquired From Third Party (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance $ 2,331.0 $ 2,246.5 $ 2,213.4
Ending balance 2,502.9 2,331.0 2,246.5
Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 3,482.8 3,299.9 3,213.8
Additions 265.8 192.1 119.8
Disposals (14.7) (13.6) (6.9)
Reclassifications 9.5 [1]   (27.6)
Interest on capitalized assets 2.9    
Translation adjustments (10.5) 4.4 0.8
Ending balance 3,735.8 3,482.8 3,299.9
Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (1,151.8) (1,053.4) (1,000.4)
Amortization (125.5) (131.9) (103.7)
Amortization of contribution from suppliers 30.2 29.8 21.1
Disposals 13.2 6.0 2.7
Reclassifications     27.7
Interest on capitalized assets (1.4) (1.3) (1.4)
Translation adjustments 2.4 (1.0) 0.6
Ending balance (1,232.9) (1,151.8) (1,053.4)
Internally generated [member] | Commercial [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 1,191.5 1,193.3 1,154.1
Ending balance 1,203.0 1,191.5 1,193.3
Internally generated [member] | Commercial [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 1,311.3 1,274.4 1,234.2
Additions 41.0 36.9 40.4
Reclassifications 9.5 [1]   (0.2)
Ending balance 1,361.8 1,311.3 1,274.4
Internally generated [member] | Commercial [member] | Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (119.8) (81.1) (80.1)
Amortization (57.7) (58.2) (31.6)
Amortization of contribution from suppliers 18.7 19.5 10.2
Reclassifications     20.4
Ending balance (158.8) (119.8) (81.1)
Internally generated [member] | Executive [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 905.5 881.6 788.4
Ending balance 923.4 905.5 881.6
Internally generated [member] | Executive [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 1,603.4 1,544.6 1,405.8
Additions 60.2 58.8 48.6
Reclassifications     90.2
Ending balance 1,663.6 1,603.4 1,544.6
Internally generated [member] | Executive [member] | Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (697.9) (663.0) (617.4)
Amortization (52.4) (43.9) (42.9)
Amortization of contribution from suppliers 11.5 10.3 10.9
Reclassifications     (12.2)
Interest on capitalized assets (1.4) (1.3) (1.4)
Ending balance (740.2) (697.9) (663.0)
Internally generated [member] | Defense and Security [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 93.1 80.5 11.9
Ending balance 126.4 93.1 80.5
Internally generated [member] | Defense and Security [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 145.9 132.4 55.8
Additions 39.6 26.1 13.7
Disposals (0.4)    
Reclassifications   (13.6) 62.0
Translation adjustments (2.0) 1.0 0.9
Ending balance 183.1 145.9 132.4
Internally generated [member] | Defense and Security [member] | Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (52.8) (51.9) (43.9)
Amortization (4.5) (3.4) (2.4)
Amortization of contribution from suppliers 0.0    
Reclassifications   2.7 (5.2)
Translation adjustments 0.6 (0.2) (0.4)
Ending balance (56.7) (52.8) (51.9)
Internally generated [member] | Service and support [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 31.0 9.0  
Ending balance 39.1 31.0 9.0
Internally generated [member] | Service and support [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 31.0 9.0  
Additions 8.1 22.0 9.0
Ending balance 39.1 31.0 9.0
Internally generated [member] | All Other Segments [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance   2.2 2.8
Ending balance     2.2
Internally generated [member] | All Other Segments [member] | Others Segment [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 9.6 2.2  
Ending balance 8.3 9.6 2.2
Internally generated [member] | All Other Segments [member] | eVTOL [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 42.4    
Ending balance 154.7 42.4  
Internally generated [member] | All Other Segments [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance   4.6 4.6
Ending balance     4.6
Internally generated [member] | All Other Segments [member] | Gross carrying amount [member] | Others Segment [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 14.4 4.6  
Additions 2.0 3.1  
Disposals   (8.6)  
Reclassifications   13.6  
Translation adjustments (2.2) 1.7  
Ending balance 14.2 14.4 4.6
Internally generated [member] | All Other Segments [member] | Gross carrying amount [member] | eVTOL [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 42.4    
Additions 109.4 42.4  
Interest on capitalized assets 2.9    
Ending balance 154.7 42.4  
Internally generated [member] | All Other Segments [member] | Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance   (2.4) (1.8)
Amortization     (0.6)
Ending balance     (2.4)
Internally generated [member] | All Other Segments [member] | Accumulated amortization [member] | Others Segment [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (4.8) (2.4)  
Amortization (1.4) (1.5)  
Disposals   2.3  
Reclassifications   (2.7)  
Translation adjustments 0.3 (0.5)  
Ending balance (5.9) (4.8) (2.4)
Not internally generated [member] | Development [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance     8.2
Not internally generated [member] | Development [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance     11.8
Reclassifications     (11.8)
Not internally generated [member] | Development [member] | Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance     (3.6)
Amortization     0.0
Reclassifications     3.6
Not internally generated [member] | Computer software [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 27.6 48.9 76.4
Ending balance 22.8 27.6 48.9
Not internally generated [member] | Computer software [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 301.6 302.0 310.6
Additions 5.5 2.8 4.1
Disposals (13.6) (3.4) (1.6)
Reclassifications     (10.1)
Translation adjustments (1.7) 0.2 (1.0)
Ending balance 291.8 301.6 302.0
Not internally generated [member] | Computer software [member] | Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (274.0) (253.1) (234.2)
Amortization (8.8) (24.0) (25.6)
Disposals 12.5 3.4 1.6
Reclassifications     4.1
Translation adjustments 1.3 (0.3) 1.0
Ending balance (269.0) (274.0) (253.1)
Not internally generated [member] | Goodwill [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 23.8 22.3 21.4
Ending balance 19.2 23.8 22.3
Not internally generated [member] | Goodwill [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 23.8 22.3 21.4
Translation adjustments (4.6) 1.5 0.9
Ending balance 19.2 23.8 22.3
Not internally generated [member] | Other intangible assets [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 6.5 8.7 150.2
Ending balance 6.0 6.5 8.7
Not internally generated [member] | Other intangible assets [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 9.0 10.6 169.6
Additions     4.0
Disposals (0.7) (1.6) (5.3)
Reclassifications     (157.7)
Ending balance 8.3 9.0 10.6
Not internally generated [member] | Other intangible assets [member] | Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (2.5) (1.9) (19.4)
Amortization (0.7) (0.9) (0.6)
Disposals 0.7 0.3 1.1
Reclassifications     17.0
Translation adjustments 0.2    
Ending balance $ (2.3) $ (2.5) $ (1.9)
[1] Non-cash transactions: reclassifications between intangible assets and inventories