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INTANGIBLES - Intangible Assets Other Than Goodwill and Trademarks (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]    
Intangible assets, net of accumulated amortization $ 3,218.5 $ 3,480.9
Intellectual property, patents, and other intangibles, net of accumulated amortization of $222.8 and $123.8    
Finite Lived Intangible Assets [Line Items]    
Intangible assets, net of accumulated amortization 1,007.6 1,108.9
Intangible assets, accumulated amortization 222.8 123.8
Backlog, net of accumulated amortization of $205.9 and $92.0    
Finite Lived Intangible Assets [Line Items]    
Intangible assets, net of accumulated amortization 1,224.7 1,342.1
Intangible assets, accumulated amortization 205.9 92.0
Customer relationships, net of accumulated amortization of $276.3 and $212.9    
Finite Lived Intangible Assets [Line Items]    
Intangible assets, net of accumulated amortization 986.2 1,029.9
Intangible assets, accumulated amortization $ 276.3 $ 212.9