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LONG-TERM DEBT - Senior Notes (Details) - Senior Notes | Apr. 30, 2021 USD ($) | Feb. 11, 2019 USD ($) | Jul. 15, 2011 EUR (€)
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Senior Notes due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Debt issued |  | $ 500,000,000.0 |
Interest of senior notes |  | 6.50% |
Deferred financing cost | $ 2,100,000 |  |
Senior Notes due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Debt issued | € |  |  | € 200,000,000.0
Interest of senior notes |  |  | 7.375%

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