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FINANCING ARRANGEMENTS - Revolving Credit Facility (Details) - USD ($)
1 Months Ended 3 Months Ended
Jul. 31, 2020
Mar. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
May 30, 2019
Debt Instrument [Line Items]          
Amount of borrowings     $ 100,000,000.0 $ 200,000,000.0  
Outstanding letters of credit     $ 23,500,000 $ 20,600,000  
2020 First Amended Credit Agreement          
Debt Instrument [Line Items]          
Unused commitment fee percentage 0.40%        
Maximum funding commitment $ 225,000,000.0        
Debt collateral, percentage of outstanding capital stock, domestic subsidiaries     100.00%    
Debt collateral, percentage of outstanding capital stock, first-tier foreign subsidiaries     65.00%    
2020 First Amended Credit Agreement | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.50%        
Commitment fee percentage, daily amount of unused commitments 0.25%        
2020 First Amended Credit Agreement | Maximum          
Debt Instrument [Line Items]          
Commitment fee percentage, daily amount of unused commitments 0.35%        
2020 First Amended Credit Agreement | Canadian Prime Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate 1.50%        
2020 First Amended Credit Agreement | Fixed Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate 2.50%        
2020 First Amended Credit Agreement | LIBOR | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate 2.00%        
Revolving Credit Facility | 2019 Credit Agreement          
Debt Instrument [Line Items]          
Aggregate principal amount         $ 400,000,000.0
Revolving Credit Facility | 2021 Second Amended Credit Agreement          
Debt Instrument [Line Items]          
Debt issuance costs     $ 3,500,000    
Minimum liquidity as a percentage of accrued merchant and supplier payables required under debt agreement   70.00%      
Monthly liquidity required as a percentage of accrued merchant and supplier payables required under debt agreement   100.00%      
Monthly liquidity required in addition to minimum   $ 50,000,000.0      
Minimum liquidity required under debt agreement   $ 250,000,000.0      
Letter of Credit | 2020 First Amended Credit Agreement          
Debt Instrument [Line Items]          
Aggregate principal amount $ 75,000,000.0