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FINANCIAL INSTRUMENTS AND DERIVATIVES - ADDITIONAL INFORMATION (Details) - USD ($) |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
May 26, 2020 | Apr. 07, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Mar. 11, 2019
Senior Notes | Senior Unsecured Notes Maturing June 1, 2030 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Debt instrument, face amount | $ 750,000,000.0 |  |  |  |
Foreign exchange forward contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, term of contract |  |  | 18 months |  |
Net Investment Hedging | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount |  |  | $ 308,600,000 |  |
Effective portion reclassified from AOCI into income (expense) |  | $ 48,100,000 |  |  |
Cash Flow Hedging | Treasury Lock |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Repayments of debt | $ 30,500,000 |  |  |  |
Derivative, notional amount |  |  |  |  | $ 150,000,000.0
Long-term debt, term |  |  |  |  | 10 years
Term of loan | 10 years |  |  |  |
Cash Flow Hedging | Treasury Lock | Senior Unsecured Notes Maturing June 1, 2030 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | $ 150,000,000.0 |  |  |  |
Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount |  |  | 325,600,000 |  |
Effective portion reclassified from AOCI into income (expense) |  |  | $ (400,000) | $ (1,400,000) |

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