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EARNINGS PER COMMON SHARE (Tables) | 3 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings Per Common Share |
| Three Months Ended December 31,
| 2017 |  | 2016
Basic EPS: |  |  |
Net Income | $ | 116.0 |  |  | $ | 45.2 |
Less: Income allocated to participating securities | 0.2 |  |  | 0.1 |
Net Income Available to Common Shareholders | $ | 115.8 |  |  | $ | 45.1 |
Weighted Average Shares Outstanding (in millions) | 48.2 |  |  | 45.5 |
Basic Earnings Per Share of Common Stock | $ | 2.40 |  |  | $ | 0.99 |
Diluted EPS: |  |  |
Net Income | $ | 116.0 |  |  | $ | 45.2 |
Less: Income allocated to participating securities | 0.2 |  |  | 0.1 |
Net Income Available to Common Shareholders | $ | 115.8 |  |  | $ | 45.1 |
Weighted Average Shares Outstanding (in millions) | 48.2 |  |  | 45.5 |
Dilutive Effect of Restricted Stock and Restricted Stock Units (in millions)* | 0.2 |  |  | 0.2 |
Weighted Average Diluted Shares (in millions) | 48.4 |  |  | 45.7 |
Diluted Earnings Per Share of Common Stock | $ | 2.39 |  |  | $ | 0.99 |
* Calculation excludes certain outstanding shares (shown in millions by period at the right) attributable to stock units subject to performance or market conditions and restricted stock, which could have a dilutive effect in the future | 0.3 |  |  | 0.4 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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