DERIVATIVE INSTRUMENTS - Amount of Gains and Losses Related Derivative Financial Instruments Not Designated as Hedging Instruments (Details) - Derivatives not designated as hedges - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Selling, general and administrative
Derivative Instruments, Gain (Loss) [Line Items]
Consolidated Statements of Operations Classification of Gain (Loss) Recognized in Operations	$ 0.1	$ (0.8)	$ (0.1)
Interest income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Consolidated Statements of Operations Classification of Gain (Loss) Recognized in Operations	0.1	17.5	(6.5)
Other income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Consolidated Statements of Operations Classification of Gain (Loss) Recognized in Operations	$ 0.0	$ 0.2	$ (1.1)