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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance $ 1,882.4 $ 1,664.6 $ 1,405.4
Ending balance 1,898.8 1,882.4 1,664.6
Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 3,635.0 3,296.7 2,900.5
Additions 290.3 470.5 505.0
Contributions from suppliers (125.5) (86.0) (123.9)
Disposals (3.4) (1.5)  
Reclassifications (6.1)   (7.3)
Impairment (58.5) (60.5)  
Interest on capitalized assets 10.0 15.8 17.8
Translation adjustments (1.6)   4.6
Ending balance 3,740.2 3,635.0 3,296.7
Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (1,752.6) (1,632.1) (1,495.1)
Amortization (112.8) (146.2) (173.9)
Amortization of contribution from suppliers 22.0 27.3 38.3
Disposals 2.2    
Reclassifications 1.4    
Interest on capitalized assets (1.6) (1.6) (1.4)
Ending balance (1,841.4) (1,752.6) (1,632.1)
Internally generated [member] | Commercial [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 793.4 522.7 352.5
Ending balance 862.7 793.4 522.7
Internally generated [member] | Commercial [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 1,825.2 1,515.1 1,276.1
Additions 209.3 313.8 351.1
Contributions from suppliers (125.5) (86.0) (123.9)
Reclassifications   71.3  
Interest on capitalized assets 7.3 11.0 11.8
Ending balance 1,916.3 1,825.2 1,515.1
Internally generated [member] | Commercial [member] | Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (1,031.8) (992.4) (923.6)
Amortization (29.6) (57.4) (92.0)
Amortization of contribution from suppliers 8.0 13.5 23.2
Reclassifications   4.5  
Interest on capitalized assets (0.2)    
Ending balance (1,053.6) (1,031.8) (992.4)
Internally generated [member] | Executive [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 882.0 895.4 871.8
Ending balance 829.0 882.0 895.4
Internally generated [member] | Executive [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 1,355.7 1,320.3 1,248.9
Additions 41.3 76.9 65.4
Reclassifications   3.6  
Impairment (58.5) (49.9)  
Interest on capitalized assets 2.7 4.8 6.0
Ending balance 1,341.2 1,355.7 1,320.3
Internally generated [member] | Executive [member] | Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (473.7) (424.9) (377.1)
Amortization (51.1) (56.7) (61.5)
Amortization of contribution from suppliers 14.0 13.8 15.1
Reclassifications   (4.3)  
Interest on capitalized assets (1.4) (1.6) (1.4)
Ending balance (512.2) (473.7) (424.9)
Internally generated [member] | Defense and Security [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 5.6 5.2  
Ending balance 11.0 5.6 5.2
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 33.5 30.8 25.6
Additions 4.0 3.0 5.2
Reclassifications 5.9 (0.3)  
Ending balance 43.4 33.5 30.8
Internally generated [member] | Defense and Security [member] | Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (27.9) (25.6) (25.6)
Amortization (1.8) (2.6)  
Reclassifications (2.7) 0.3  
Ending balance (32.4) (27.9) (25.6)
Internally generated [member] | All Other Segments [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 4.7 51.8 36.1
Ending balance 2.3 4.7 51.8
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 5.8 51.8 36.1
Additions 0.1 2.5 15.7
Reclassifications (2.4) (48.5)  
Ending balance 3.5 5.8 51.8
Internally generated [member] | All Other Segments [member] | Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (1.1)    
Amortization (0.1) (0.1)  
Reclassifications   (1.0)  
Ending balance (1.2) (1.1)  
Not internally generated [member] | Development [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 7.1 7.8 5.5
Ending balance 3.4 7.1 7.8
Not internally generated [member] | Development [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 13.9 13.5 10.1
Additions 2.5 1.9 10.7
Disposals   (1.5)  
Reclassifications (10.1)   (7.3)
Ending balance 6.3 13.9 13.5
Not internally generated [member] | Development [member] | Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (6.8) (5.7) (4.6)
Amortization (0.9) (1.1) (1.1)
Reclassifications 4.8    
Ending balance (2.9) (6.8) (5.7)
Not internally generated [member] | Computer software [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 136.4 131.6 102.4
Ending balance 117.5 136.4 131.6
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 343.3 311.4 263.3
Additions 8.0 56.3 48.1
Disposals (3.4)    
Reclassifications 2.4 (24.4)  
Ending balance 350.3 343.3 311.4
Not internally generated [member] | Computer software [member] | Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (206.9) (179.8) (160.9)
Amortization (28.1) (27.1) (18.9)
Disposals 2.2    
Ending balance (232.8) (206.9) (179.8)
Not internally generated [member] | Goodwill [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 12.0 21.0 16.4
Ending balance 10.4 12.0 21.0
Not internally generated [member] | Goodwill [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 12.0 21.0 16.4
Impairment   (8.7)  
Translation adjustments (1.6) (0.3) 4.6
Ending balance 10.4 12.0 21.0
Not internally generated [member] | Other intangible assets [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 41.2 29.1 20.7
Ending balance 62.5 41.2 29.1
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 45.6 32.8 24.0
Additions 25.1 16.1 8.8
Reclassifications (1.9) (1.7)  
Impairment   (1.9)  
Translation adjustments   0.3  
Ending balance 68.8 45.6 32.8
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 (4.4) (3.7) (3.3)
Amortization (1.2) (1.2) (0.4)
Reclassifications (0.7) 0.5  
Ending balance $ (6.3) $ (4.4) $ (3.7)