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REVENUE REVENUE (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Contract with Customer, Liability [Abstract]    
Contract with customer, liability $ 46.3 $ 57.1
Revenue recognized included in beginning balance (35.1)  
Net additions 24.3  
Contract with Customer, Liability, Current 27.6 22.2
Contract with Customer, Liability, Noncurrent 18.7 $ 34.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 1,798.9  
Remaining Contract Terms [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Performance Obligation, Contract Term one month to 24 years  
2020 [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 87.1  
2021 [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount 320.0  
2022 [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount 259.9  
2023 [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount 230.9  
Thereafter [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 901.0