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FAIR VALUE MEASUREMENTS - LEVEL 3 RECONCILIATION (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]        
Balance at the beginning of the period $ 10.4 $ 16.7 $ 7.4 $ 4.4
Purchases 0.0 0.0 12.8 18.4
Settlements (4.2) (5.2) (14.0) (11.3)
Balance at the end of period $ 6.2 $ 11.5 $ 6.2 $ 11.5