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LONG-TERM OBLIGATIONS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 10 Months Ended 14 Months Ended 36 Months Ended 60 Months Ended
Feb. 04, 2019
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Feb. 04, 2024
Mar. 31, 2020
Mar. 31, 2023
Feb. 04, 2024
Dec. 31, 2020
Debt Instrument [Line Items]                    
Consolidated leverage ratio   0.5   0.5            
Consolidated interest coverage ratio   41.9   41.9            
Principal amount   $ 191.8   $ 191.8           $ 217.7
Term Loan [Member] | One Hundred Seventy Five Million Term Loan Facility [Member]                    
Debt Instrument [Line Items]                    
Debt instrument, face amount   $ 175.0   $ 175.0            
Weighted average interest rate (percent)   1.40% 2.00% 1.50% 2.60%          
Maturity Date       Feb. 04, 2024            
Principal amount   $ 159.7   $ 159.7           164.1
Revolving Credit Facility [Member] | Five Hundred Fifty Million Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Debt instrument, face amount   $ 550.0   $ 550.0            
Weighted average interest rate (percent)   1.70% 2.10% 1.80% 2.50%          
Maturity Date       Feb. 04, 2024            
Remaining availability under revolving credit facility   $ 490.3   $ 490.3            
Principal amount   30.0   30.0           $ 51.0
Line of Credit [Member] | Five Hundred Fifty Million Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Outstanding letters of credit   $ 29.7   $ 29.7            
Amended Credit Agreement [Member]                    
Debt Instrument [Line Items]                    
Credit facility, maximum borrowing capacity $ 725.0                  
Additional interest rate above Federal Fund rate 0.50%                  
Additional interest rate above Eurodollar rate 1.00%                  
Percentage of consolidated revenue and adjusted EBITDA that guarantor wholly-owned subsidiaries represent 95.00%                  
Percentage of adjusted EBITDA that guarantor subsidiaries represent 70.00%                  
Amended Credit Agreement [Member] | Five Hundred Fifty Million Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Debt instrument, face amount $ 550.0                  
Amended Credit Agreement [Member] | One Hundred Seventy Five Million Term Loan Facility [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument Periodic Payment Percentage             0.625%      
Debt instrument, face amount $ 175.0                  
Base Rate [Member] | Amended Credit Agreement [Member]                    
Debt Instrument [Line Items]                    
Description of variable rate basis Fluctuating rate per annum equal to the highest of (a) the federal funds rate plus 0.50% per annum, (b) the prime rate of interest established by the Administrative Agent, and (c) the Eurodollar Rate for an interest period of one month plus 1% per annum.                  
Base Rate [Member] | Amended Credit Agreement [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate       0.25%            
Eurodollar [Member] | Amended Credit Agreement [Member]                    
Debt Instrument [Line Items]                    
Description of variable rate basis Rate at which Eurodollar deposits in the London interbank market for an interest period of one, two, three or six months                  
Eurodollar [Member] | Term Loan [Member] | One Hundred Seventy Five Million Term Loan Facility [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument Interest Rate at Period End   1.40%   1.40%            
Eurodollar [Member] | Revolving Credit Facility [Member] | Five Hundred Fifty Million Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument Interest Rate at Period End   1.30%   1.30%            
Eurodollar [Member] | Amended Credit Agreement [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate       1.25%            
Minimum [Member] | Amended Credit Agreement [Member]                    
Debt Instrument [Line Items]                    
Proceeds Received From Loan Party Of Subsidiary $ 5.0                  
Subsequent Event | Amended Credit Agreement [Member]                    
Debt Instrument [Line Items]                    
Maturity Date                 Feb. 04, 2024  
Subsequent Event | Amended Credit Agreement [Member] | One Hundred Seventy Five Million Term Loan Facility [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument Periodic Payment Percentage           1.875%   1.25%