DERIVATIVE INSTRUMENTS - Gains and Losses Recognized in OCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Derivative [Line Items]
Gain (Loss) Recognized in OCI	$ 156.4	$ 67.5	$ (191.1)	$ 125.5
Foreign exchange forward contracts
Derivative [Line Items]
Gain (Loss) Recognized in OCI	0.0	1.5	(0.4)	0.9
Interest rate swap contracts
Derivative [Line Items]
Gain (Loss) Recognized in OCI	3.9	(27.9)	4.3	(24.3)
Cross-currency swap contracts
Derivative [Line Items]
Gain (Loss) Recognized in OCI	$ 0.0	$ 14.9	$ (25.1)	$ (3.8)