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REVENUE REVENUE (Details) - USD ($)
 6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Contract with Customer, Asset and Liability [Abstract]    
Contract with customer, asset $ 5,300,000 $ 6,200,000
Amounts invoiced in excess of revenue recognized (900,000)  
Contract with customer, asset, net, current 1,300,000 1,700,000
Contract with customer, asset, net, noncurrent 4,000,000.0 4,500,000
Contract with customer, liability 50,900,000 31,700,000
Revenue recognized included in beginning balance (14,500,000)  
Net additions 33,700,000  
Contract with customer, liability, current 30,400,000 15,600,000
Contract with customer, liability, noncurrent 20,500,000 $ 16,100,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount 1,953,300,000  
2019 [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount 182,700,000  
2020 [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount 326,900,000  
2021 [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount 279,600,000  
2022 [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount 226,500,000  
Thereafter [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 937,600,000