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ACQUISITIONS - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Jan. 16, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Business Acquisition [Line Items]        
Goodwill, expected to provide a tax benefit     $ 127.3  
Contingent consideration, liability   $ 0.0   $ 9.2
Additional consideration including interest paid   $ 8.4 1.1  
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   372.3  
ECS | Technology (15-year life)        
Business Acquisition [Line Items]        
Other intangible assets: $ 173.3   $ 173.3