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Earnings Per Share (Tables) | 12 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Computation of basic and diluted earnings per share |
| Year Ended September 30,
| 2025 |  | 2024 |  | 2023
Net earnings | $ | 216.2 |  |  | $ | 246.5 |  |  | $ | 165.5 |
shares in millions |  |  |  |  |
Weighted-average shares for basic earnings per share | 126.9 |  |  | 130.3 |  |  | 133.0 |
Effect of dilutive securities: |  |  |  |  |
Stock options | 0.2 |  |  | 0.2 |  |  | 0.1 |
Restricted stock units | 0.3 |  |  | 0.3 |  |  | 0.3 |
Performance-based restricted stock units | 1.1 |  |  | 1.5 |  |  | 0.7 |
Weighted-average shares for diluted earnings per share | 128.5 |  |  | 132.3 |  |  | 134.1 |
Basic earnings per share | $ | 1.70 |  |  | $ | 1.89 |  |  | $ | 1.24 |
Diluted earnings per share | $ | 1.68 |  |  | $ | 1.86 |  |  | $ | 1.23 |
Antidilutive securities excluded from computation of earnings per share |
| Year Ended September 30,
shares in millions | 2025 |  | 2024 |  | 2023
Restricted stock units | 0.1 |  |  | — |  |  | 0.1 |
Performance-based restricted stock units | — |  |  | — |  |  | 0.1 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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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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