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Intangible Assets, Goodwill, Acquisitions, and Divestitures - Summary of Goodwill (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Sep. 30, 2023
Goodwill [Line Items] |  |  |
Beginning balance |  | $ 2,021.4 | $ 2,008.8
Acquisitions | [1] | 0.1 | 12.6
Divestiture |  | (5.8) |
Ending balance |  | 2,015.7 | 2,021.4
Maintenance Services |  |  |
Goodwill [Line Items] |  |  |
Beginning balance |  | 1,803.4 | 1,792.7
Acquisitions | [1] | 0.1 | 10.7
Divestiture |  | (5.8) |
Ending balance |  | 1,797.7 | 1,803.4
Development Services |  |  |
Goodwill [Line Items] |  |  |
Beginning balance |  | 218.0 | 216.1
Acquisitions | [1] | 0.0 | 1.9
Divestiture |  | 0.0 |
Ending balance |  | $ 218.0 | $ 218.0
[1] | The acquisitions adjustment includes the immaterial impact of foreign currency adjustments during the period

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