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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounting for Non-qualified Deferred Compensation Plan (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Non-qualified deferred compensation plan payout period | 15 years |  |
SG&A |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Executive deferred compensation program, compensation expense (benefit) | $ 27.6 | $ (44.2) | $ 56.5
Net gains (losses) on Deferred Savings Plan assets | $ 27.6 | $ (44.3) | $ 56.8

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