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REVENUE REVENUE (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Contract with Customer, Liability [Abstract]    
Contract with customer, liability $ 50.4 $ 57.1
Revenue recognized included in beginning balance (b) (34.1)  
Net additions 27.4  
Contract with Customer, Liability, Current 31.3 22.2
Contract with Customer, Liability, Noncurrent 19.1 $ 34.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 1,744.3  
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 $ 172.4  
2021 [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount 312.4  
2022 [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount 229.9  
2023 [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount 183.0  
Thereafter [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 846.6