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Earnings Per Common Share | 12 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Earnings Per Common Share | 4. EARNINGS PER COMMON SHARE
|  | 2020 |  |  | 2019 |  |  | 2018 |
Basic Earnings Per Common Share: |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  | $ | 88.6 |  |  | $ | 184.6 |  |  | $ | 214.2 |
Less: Provision for preferred dividends |  |  | 14.8 |  |  |  | 5.3 |  |  |  | — |
Income allocated to participating securities |  |  | 0.1 |  |  |  | 0.4 |  |  |  | 0.5 |
Net Income Available to Common Shareholders |  | $ | 73.7 |  |  | $ | 178.9 |  |  | $ | 213.7 |
Weighted Average Common Shares Outstanding (in millions) |  |  | 51.2 |  |  |  | 50.7 |  |  |  | 49.1 |
Basic Earnings Per Share of Common Stock |  | $ | 1.44 |  |  | $ | 3.53 |  |  | $ | 4.35 |
Diluted Earnings per Common Share: |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  | $ | 88.6 |  |  | $ | 184.6 |  |  | $ | 214.2 |
Less: Provision for preferred dividends |  |  | 14.8 |  |  |  | 5.3 |  |  |  | — |
Income allocated to participating securities |  |  | 0.1 |  |  |  | 0.4 |  |  |  | 0.5 |
Net Income Available to Common Shareholders |  | $ | 73.7 |  |  | $ | 178.9 |  |  | $ | 213.7 |
Weighted Average Common Shares Outstanding (in millions) |  |  | 51.2 |  |  |  | 50.7 |  |  |  | 49.1 |
Dilutive Effect of Restricted Stock and Restricted Stock Units (in millions)* |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.2 |
Weighted Average Diluted Common Shares (in millions) |  |  | 51.3 |  |  |  | 50.8 |  |  |  | 49.3 |
Diluted Earnings Per Share of Common Stock |  | $ | 1.44 |  |  | $ | 3.52 |  |  | $ | 4.33 |
* 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 |  |  |  | 0.4 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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