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FINANCING ARRANGEMENTS - Revolving Credit Facility (Details) - USD ($) | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Jul. 31, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | May 30, 2019
Debt Instrument [Line Items] |  |  |  |  |
Amount of borrowings | $ 100,000,000.0 |  | $ 100,000,000.0 | $ 200,000,000.0 |
Outstanding letters of credit | $ 23,100,000 |  | $ 23,100,000 | $ 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% |  | 100.00% |  |
Debt collateral, percentage of outstanding capital stock, first-tier foreign subsidiaries | 65.00% |  | 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 | 2020 First Amended Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount |  | $ 225,000,000.0 |  |  |
Revolving Credit Facility | 2021 Second Amended Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issuance costs | $ 3,500,000 |  | $ 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 |  | 50,000,000.0 |  |
Minimum liquidity required under debt agreement | $ 250,000,000 |  | $ 250,000,000 |  |
Letter of Credit | 2020 First Amended Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount |  | $ 75,000,000.0 |  |  |

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