FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets Measured on Recurring and Nonrecurring Basis
Total debt, carrying value	$ 196.8	$ 94.6
Recurring Basis
Fair Value, Assets Measured on Recurring and Nonrecurring Basis
Cash equivalents	6.2	20.2
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on Recurring and Nonrecurring Basis
Cash equivalents	6.2	20.2
Recurring Basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring and Nonrecurring Basis
Cash equivalents	0.0	0.0
Recurring Basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring and Nonrecurring Basis
Cash equivalents	0.0	0.0
Carrying value
Fair Value, Assets Measured on Recurring and Nonrecurring Basis
Total debt, carrying value	196.8	94.6
Fair value | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring and Nonrecurring Basis
Total debt, fair value	$ 206.7	$ 107.3