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FINANCIAL INSTRUMENTS - Gross Notional Amounts for Outstanding Derivatives (Details) - Forward contracts - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Derivatives Designated as Hedging Instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notional amount, forward contracts $ 138.1 $ 128.5
Gross fair value of derivative assets 4.5 0.9
Gross fair value of derivative liabilities 0.8 2.9
Derivatives Not Designated as Hedging Instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notional amount, forward contracts 143.3 168.4
Gross fair value of derivative assets 2.9 1.2
Gross fair value of derivative liabilities $ 0.8 $ 4.6