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REVENUES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Jan. 01, 2018
Revenue from Contract with Customer [Abstract]    
Current contract liabilities $ 99.4 $ 100.6
Noncurrent contract liabilities 8.1 $ 6.0
Deferred revenue recognized 40.6  
Net capitalized costs to obtain a contract 161.3  
Net capitalized costs to fulfill a contract $ 7.3  
Amortization period of capitalized contract costs 7 years  
Amortization of capitalized contract costs $ 10.2