DERIVATIVE INSTRUMENTS - Gains and Losses Recognized in OCI (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Cash flow hedging | Foreign exchange forward contracts
Derivative [Line Items]
Gain (Loss) Recognized in OCI	$ (0.3)	$ 1.3	$ 0.9
Cash flow hedging | Interest rate swap contracts
Derivative [Line Items]
Gain (Loss) Recognized in OCI	1.0	(50.3)	(47.4)
Cash flow hedging | Cross-currency swap contracts
Derivative [Line Items]
Gain (Loss) Recognized in OCI	(25.1)	(12.5)	0.0
Net investment hedge
Derivative [Line Items]
Gain (Loss) Recognized in OCI	$ (256.5)	$ 47.1	$ 99.8