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REVENUES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]        
Revenue recognized from contract liabilities balances at beginning of the period $ 86.7 $ 52.0 $ 159.9 $ 97.1