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Earnings Per Share (Tables) | 6 Months Ended
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Mar. 31, 2020
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,
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019
​ | ​ | (in millions)
Denominator for basic earnings per share |  | 158.6 |  | 156.6 |  | 157.9 |  | 156.5
Potential common shares |  | 2.1 |  | 1.8 |  | 2.8 |  | 2.5
Denominator for diluted earnings per share |  | 160.7 |  | 158.4 |  | 160.7 |  | 159.0

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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=6371337&loc=d3e3550-109257 + Details
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