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SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  | 3 Months Ended | 6 Months Ended
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Mar. 04, 2020 | Mar. 02, 2020 | Dec. 13, 2019 | Dec. 02, 2019 | Sep. 04, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020 | Mar. 31, 2019
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of common shares authorized to be repurchased (up to) (in shares) |  |  |  |  |  | 4,000,000,000,000 |  |  |  | 4,000,000,000,000 |
Purchases of common shares (in shares) |  |  |  |  |  | 1,500,000 |  |  |  | 1,500,000 | 0
Purchases of common shares, value |  |  |  |  |  | $ 28.5 |  |  |  | $ 28.5 |
Cash dividends declared (in dollars per share) | $ 0.71 |  | $ 0.71 |  | $ 0.71 | $ 0.71 | $ 0.71 | $ 0.71 | $ 0.71 |  |
Cash dividends paid (in dollars per share) |  | $ 0.71 |  | $ 0.71 |  |  |  |  |  |  |
Dividends payable |  |  |  |  |  | $ 77.3 |  |  |  | $ 77.3 |

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