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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 |
--- | --- | --- | --- | ---
Nov. 05, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2020
Dividends Payable |  |  |  |  |  |  |  |
Cash dividends declared (in dollars per share) | $ 0.90 | $ 0.90 | $ 0.90 | $ 0.85 | $ 0.75 |  |  |
Payment of dividends |  | $ 139.6 |  | $ 134.7 |  | $ 280.7 | $ 256.3 |
Restricted stock unit, Performance-based and Service-based |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  |  |
Dividends payable |  | $ 9.5 |  |  |  | $ 9.5 |  | $ 8.3

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