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Equity and Noncontrolling Interests (Details) - $ / shares | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2018 | Oct. 31, 2018 | Aug. 31, 2018 | Jun. 30, 2018 | May 31, 2018 | Mar. 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Sep. 30, 2017 | Aug. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per share (in dollars per share) |  | $ 0.275 |  | $ 0.275 |  | $ 0.275 |  | $ 0.275 | $ 0.275 |  | $ 0.275 |  | $ 0.275 | $ 0.275 | $ 0.825
Cash dividends paid (in dollars per share) | $ 0.275 |  | $ 0.275 |  | $ 0.275 |  | $ 0.275 | $ 0.275 |  | $ 0.275 |  | $ 0.275 |  |  |

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