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Note 4 - Earnings Per Common Share (Tables) | 12 Months Ended
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Sep. 30, 2023
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  |  | 2023 |  |  | 2022 |  |  | 2021 |
Basic Earnings Per Common Share: |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  | $ | 217.5 |  |  | $ | 220.8 |  |  | $ | 271.7 |
Less: | Provision for preferred dividends |  |  | 14.8 |  |  |  | 14.8 |  |  |  | 14.8 |
| Income allocated to participating securities |  |  | 0.3 |  |  |  | 0.3 |  |  |  | 0.4 |
Net Income Available to Common Shareholders |  | $ | 202.4 |  |  | $ | 205.7 |  |  | $ | 256.5 |
Weighted Average Common Shares Outstanding (in millions) |  |  | 52.5 |  |  |  | 52.0 |  |  |  | 51.6 |
Basic Earnings Per Share of Common Stock |  | $ | 3.86 |  |  | $ | 3.96 |  |  | $ | 4.97 |
Diluted Earnings per Common Share: |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  | $ | 217.5 |  |  | $ | 220.8 |  |  | $ | 271.7 |
Less: | Provision for preferred dividends |  |  | 14.8 |  |  |  | 14.8 |  |  |  | 14.8 |
| Income allocated to participating securities |  |  | 0.3 |  |  |  | 0.3 |  |  |  | 0.4 |
Net Income Available to Common Shareholders |  | $ | 202.4 |  |  | $ | 205.7 |  |  | $ | 256.5 |
Weighted Average Common Shares Outstanding (in millions) |  |  | 52.5 |  |  |  | 52.0 |  |  |  | 51.6 |
Dilutive Effect of Restricted Stock and Restricted Stock Units (in millions)* |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.1 |
Weighted Average Diluted Common Shares (in millions) |  |  | 52.6 |  |  |  | 52.1 |  |  |  | 51.7 |
Diluted Earnings Per Share of Common Stock |  | $ | 3.85 |  |  | $ | 3.95 |  |  | $ | 4.96 |
* Calculation excludes certain outstanding common shares (shown in millions by period at the right) attributable to common stock forward contracts, stock units subject to performance or market conditions, and restricted stock, which could have a dilutive effect in the future |  |  | 1.9 |  |  |  | 0.1 |  |  |  | 0.1 |

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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/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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