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Segment Information - Summary of Assets by Operating Segment (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of geographical areas [line items]          
Trade accounts receivable $ 318.0 $ 297.0      
Property, plant and equipment 1,964.7 2,104.9 $ 2,154.2 $ 2,154.2  
Intangible assets 1,898.8 1,882.4 $ 1,664.6 $ 1,664.6 $ 1,405.4
Operating Segment [member]          
Disclosure of geographical areas [line items]          
Trade accounts receivable 318.0 297.0      
Property, plant and equipment 1,964.7 2,104.9      
Intangible assets 1,898.8 1,882.4      
Total 4,181.5 4,284.3      
Commercial Aviation [member] | Operating Segment [member]          
Disclosure of geographical areas [line items]          
Trade accounts receivable 5.8 2.7      
Property, plant and equipment 688.8 781.3      
Intangible assets 862.5 793.1      
Total 1,557.1 1,577.1      
Defense and Security [member] | Operating Segment [member]          
Disclosure of geographical areas [line items]          
Trade accounts receivable 111.2 22.9      
Property, plant and equipment 295.6 578.4      
Intangible assets 11.0 5.7      
Total 417.8 607.0      
Executive Jets [member] | Operating Segment [member]          
Disclosure of geographical areas [line items]          
Trade accounts receivable 1.3 6.8      
Property, plant and equipment 544.0 298.7      
Intangible assets 829.0 881.9      
Total 1,374.3 1,187.4      
Service and support [member] | Operating Segment [member]          
Disclosure of geographical areas [line items]          
Trade accounts receivable 192.2 256.3      
Property, plant and equipment 435.6 445.8      
Total 627.8 702.1      
All Other Segments [member] | Operating Segment [member]          
Disclosure of geographical areas [line items]          
Trade accounts receivable 7.5 8.2      
Property, plant and equipment 0.7 0.7      
Intangible assets 78.4 64.9      
Total 86.6 73.8      
Total reportable Segments [member] | Operating Segment [member]          
Disclosure of geographical areas [line items]          
Trade accounts receivable 318.0 296.9      
Property, plant and equipment 1,964.7 2,104.9      
Intangible assets 1,780.9 1,745.6      
Total 4,063.6 4,147.4      
Unallocated [member] | Operating Segment [member]          
Disclosure of geographical areas [line items]          
Intangible assets 117.9 136.8      
Total $ 117.9 $ 136.8