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ACQUISITIONS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 16, 2019
Mar. 31, 2019
Mar. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Goodwill, expected to provide a tax benefit     $ 126.4  
Contingent consideration, liability     $ 7.9 $ 9.2
ECS        
Business Acquisition [Line Items]        
Purchase price $ 1,244.3 $ 1,244.3    
Goodwill acquired 559.3      
ECS | Customer relationships (15-year life)        
Business Acquisition [Line Items]        
Other intangible assets: 372.3 372.7    
ECS | Technology (15-year life)        
Business Acquisition [Line Items]        
Other intangible assets: $ 173.3 $ 173.3