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Earnings Per Share (Tables) | 6 Months Ended
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Mar. 31, 2022
Earnings Per Share |
Reconciliation of the denominators for basic and diluted EPS | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | March 31, | ​ | March 31, |  | March 31, |  | March 31,
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021
​ | ​ | (in millions)
Denominator for basic earnings per share | ​ | 141.1 | ​ | 147.8 | ​ | 141.4 | ​ | 149.6
Potential common shares | ​ | 1.5 | ​ | 1.7 | ​ | 2.2 | ​ | 2.0
Denominator for diluted earnings per share | ​ | 142.6 | ​ | 149.5 | ​ | 143.6 | ​ | 151.6

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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