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REVENUES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]        
Revenue recognized from contract liabilities balances at beginning of the period $ 52.0 $ 37.0 $ 97.1 $ 69.9