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Share-Based Payments (Tables) | 12 Months Ended
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Sep. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Schedule of Restricted Stock Units and PEP Units Activity | Restricted stock unit and PEP unit activity for the year ended September 30 was as follows:
| Restricted Stock Units |  | Weighted Average Grant-Date Fair Value |  | PEP Units |  | Weighted Average Grant-Date Fair Value
| (in millions) |  |  |  | (in millions) |  |
Outstanding at September 30, 2022 | 1.0 |  | $ | 53.05 |  |  | 0.7 |  | $ | 60.60 |
Granted | 0.3 |  | $ | 83.64 |  |  | 0.2 |  | $ | 94.64 |
PEP units earned (unearned) | — |  | $ | — |  |  | 0.2 |  | $ | 43.19 |
Vested | (0.4) |  | $ | 44.35 |  |  | (0.4) |  | $ | 43.19 |
Cancelled | (0.1) |  | $ | 62.09 |  |  | — |  | $ | 71.71 |
Outstanding at September 30, 2023 | 0.8 |  | $ | 68.34 |  |  | 0.7 |  | $ | 75.54 |
Granted | 0.3 |  | $ | 92.30 |  |  | 0.2 |  | $ | 104.66 |
PEP units earned (unearned) | — |  | $ | — |  |  | 0.2 |  | $ | 52.50 |
Vested | (0.3) |  | $ | 50.14 |  |  | (0.4) |  | $ | 52.50 |
Cancelled | 0.0 |  | $ | 77.32 |  |  | — |  | $ | 89.76 |
Outstanding at September 30, 2024 | 0.8 |  | $ | 83.96 |  |  | 0.7 |  | $ | 95.38 |
Granted | 0.2 |  | $ | 110.65 |  |  | 0.2 |  | $ | 129.28 |
PEP units earned (unearned) | — |  | $ | — |  |  | 0.1 |  | $ | 85.46 |
Vested | (0.2) |  | $ | 75.72 |  |  | (0.3) |  | $ | 85.46 |
Cancelled | (0.1) |  | $ | 95.85 |  |  | (0.1) |  | $ | 109.53 |
Outstanding at September 30, 2025 | 0.7 |  | $ | 95.64 |  |  | 0.6 |  | $ | 109.74 |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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