FAIR VALUE MEASUREMENTS - Fair Value Measurement on Recurring Basis (Details) - Recurring - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Level 1 Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	$ 31.1	$ 31.7	$ 28.3
Level 1 Fair Value | Mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	31.1	31.7	28.3
Level 2 Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, net asset (liability)	0.8	0.2	3.4
Level 2 Fair Value | Money market mutual fund
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0.8	0.5	0.4
Level 2 Fair Value | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities, fair value disclosure	$ 0.0	$ (0.3)	$ 3.0