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Earnings Per Common Share | 6 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Earnings Per Common Share | 3. EARNINGS PER COMMON SHARE
|  | Three Months Ended March 31, |  |  | Six Months Ended March 31, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Basic Earnings Per Common Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  | $ | 187.4 |  |  | $ | 133.6 |  |  | $ | 276.3 |  |  | $ | 200.6 |
Less: Provision for preferred dividends |  |  | 3.7 |  |  |  | 3.7 |  |  |  | 7.4 |  |  |  | 7.4 |
Income allocated to participating securities |  |  | 0.3 |  |  |  | 0.2 |  |  |  | 0.4 |  |  |  | 0.3 |
Income Available to Common Shareholders |  | $ | 183.4 |  |  | $ | 129.7 |  |  | $ | 268.5 |  |  | $ | 192.9 |
Weighted Average Common Shares Outstanding (in millions) |  |  | 51.6 |  |  |  | 51.0 |  |  |  | 51.6 |  |  |  | 51.0 |
Basic Earnings Per Common Share |  | $ | 3.56 |  |  | $ | 2.55 |  |  | $ | 5.21 |  |  | $ | 3.78 |
Diluted Earnings Per Common Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  | $ | 187.4 |  |  | $ | 133.6 |  |  | $ | 276.3 |  |  | $ | 200.6 |
Less: Provision for preferred dividends |  |  | 3.7 |  |  |  | 3.7 |  |  |  | 7.4 |  |  |  | 7.4 |
Income allocated to participating securities |  |  | 0.3 |  |  |  | 0.2 |  |  |  | 0.4 |  |  |  | 0.3 |
Income Available to Common Shareholders |  | $ | 183.4 |  |  | $ | 129.7 |  |  | $ | 268.5 |  |  | $ | 192.9 |
Weighted Average Common Shares Outstanding (in millions) |  |  | 51.6 |  |  |  | 51.0 |  |  |  | 51.6 |  |  |  | 51.0 |
Dilutive Effect of Restricted Stock and Restricted Stock Units (in millions)* |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.1 |
Weighted Average Diluted Common Shares (in millions) |  |  | 51.7 |  |  |  | 51.1 |  |  |  | 51.7 |  |  |  | 51.1 |
Diluted Earnings Per Common Share |  | $ | 3.55 |  |  | $ | 2.54 |  |  | $ | 5.20 |  |  | $ | 3.77 |
* Calculation excludes certain outstanding common 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 |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.1 |

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