SHARE-BASED COMPENSATION PLANS - Summary of the Total Intrinsic Value of Stock Options Exercised and Payment to Settle Nonqualified Stock Options (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Share-based Payment Arrangement [Abstract]
Weighted-average grant date fair value of stock options (in dollars per share)	$ 3.41	$ 2.87	$ 4.87
Intrinsic value of options exercised	$ 6.1	$ 11.5	$ 32.2

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration