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LONG-TERM DEBT, DERIVATIVES AND LETTERS OF CREDIT - Derivatives and Hedging, Additional Information (Details)
€ in Millions, $ in Millions
Dec. 31, 2019
USD ($)
Dec. 31, 2019
EUR (€)
May 17, 2018
USD ($)
Net investment hedge      
Debt Instrument [Line Items]      
Borrowing under credit facility $ 13.8 € 12.3  
Credit Facility | Not Designated as Hedging Instrument      
Debt Instrument [Line Items]      
Embedded derivative liability     $ 45.4