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EQUITY, LONG-TERM INCENTIVE COMPENSATION PLANS AND NON-CONTROLLING INTEREST - Cash Dividends (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Dec. 01, 2021 | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2021
Dividends Payable |  |  |  |  |  |  |  |
Cash dividends declared (in dollars per share) | $ 1.05 |  | $ 1.05 | $ 0.90 | $ 0.90 |  |  |
Restricted stock unit, Performance-based and Service-based |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  |  |
Dividends payable |  | $ 10.4 |  |  |  | $ 10.4 |  | $ 10.3
Additional paid-in capital |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  |  |
Payment of dividends |  | $ 159.1 |  | $ 139.6 |  | $ 322.0 | $ 280.7 |

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