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REVENUE (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Revenue from Contract with Customer [Abstract]            
Accounts Receivable, Less Allowance       $ 2,414.1 $ 2,078.1 $ 2,291.5
Contract Assets (Current)       61.7 52.0  
Contract Assets (Long-Term)       157.2 170.7  
Other accruals       182.6 266.3  
Other long-term liabilities       8.4 8.2  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning balance $ 53.5 $ 36.5        
Adjustment upon adoption of ASU 2016-13 58.8 60.2 $ 36.5 $ 58.8 $ 53.5 $ 60.2
Bad debt expense 6.4 30.2        
Uncollectible accounts written off, net of recoveries (1.1) (9.5)        
Ending balance $ 58.8 $ 60.2 $ 36.5      
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201613Member      
Revenue, performance obligation, description of payment terms 30 and 60 days,          
Cumulative effect, period of adoption, adjustment            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning balance   $ 3.0        
Adjustment upon adoption of ASU 2016-13   $ 3.0 $ 3.0      
Ending balance     $ 3.0