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FAIR VALUE MEASUREMENTS - Fair Value Measurement on Recurring Basis (Details) - Recurring - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Level 1 Fair Value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, fair value disclosure $ 31.5 $ 31.7 $ 29.7
Level 1 Fair Value | Mutual funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, fair value disclosure 31.5 31.7 29.7
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 (1.2)
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 0.8
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) $ (2.0)