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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 | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2021 | Mar. 31, 2020 | Jun. 30, 2020
Dividends Payable |  |  |  |  |  |  |  |  |
Cash dividends declared (in dollars per share) | $ 0.90 | $ 0.90 | $ 0.90 | $ 0.85 | $ 0.85 | $ 0.75 |  |  |
Payment of dividends | $ 139.3 |  |  | $ 133.3 |  |  | $ 420.1 | $ 389.7 |
Restricted stock unit, Performance-based and Service-based |  |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  |  |  |
Dividends payable | $ 10.3 |  |  |  |  |  | $ 10.3 |  | $ 8.3

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