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FINANCIAL INSTRUMENTS - Gross Notional Amounts for Outstanding Derivatives (Details) - Forward contracts - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Derivatives Designated as Hedging Instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notional amounts of outstanding currency forward contracts $ 144.0 $ 154.5
Derivatives Designated as Hedging Instruments | Prepaids and other current assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notional amounts of outstanding currency forward contracts 0.9 1.3
Derivatives Designated as Hedging Instruments | Other accrued liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notional amounts of outstanding currency forward contracts 1.8 0.5
Derivatives Not Designated as Hedging Instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notional amounts of outstanding currency forward contracts 260.9 227.2
Derivatives Not Designated as Hedging Instruments | Prepaids and other current assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notional amounts of outstanding currency forward contracts 0.9 2.2
Derivatives Not Designated as Hedging Instruments | Other accrued liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notional amounts of outstanding currency forward contracts $ 1.3 $ 0.7