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FAIR VALUE MEASUREMENTS - LEVEL 3 RECONCILIATION (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]        
Balance at the beginning of the period $ 1.5 $ 1.7 $ 4.4 $ 5.1
Purchases 18.4 13.8 18.4 13.8
Settlements (3.2) (3.7) (6.1) (7.1)
Balance at the end of period $ 16.7 $ 11.8 $ 16.7 $ 11.8