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Intangibles - Intangible Assets Other Than Goodwill and Trade Names (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]    
Intangible assets, net of accumulated amortization $ 3,262.0 $ 3,480.9
Intellectual property, patents, non-compete and other intangibles    
Finite Lived Intangible Assets [Line Items]    
Intangible assets, net of accumulated amortization 1,032.3 1,108.9
Intangible assets, accumulated amortization 198.2 123.8
Backlog    
Finite Lived Intangible Assets [Line Items]    
Intangible assets, net of accumulated amortization 1,248.5 1,342.1
Intangible assets, accumulated amortization 177.7 92.0
Customer relationships    
Finite Lived Intangible Assets [Line Items]    
Intangible assets, net of accumulated amortization 981.2 1,029.9
Intangible assets, accumulated amortization $ 254.2 $ 212.9