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Intangible Assets, Goodwill, Acquisitions, and Divestitures - Schedule of Intangible Assets (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Sep. 30, 2023
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Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 715.9 | $ 732.0
Accumulated Amortization | (603.2) | (599.7)
Customer Relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 715.9 | 725.5
Accumulated Amortization | $ (603.2) | (594.1)
Customer Relationships | Minimum |  |
Finite Lived Intangible Assets [Line Items] |  |
Useful Life | 6 years |
Customer Relationships | Maximum |  |
Finite Lived Intangible Assets [Line Items] |  |
Useful Life | 21 years |
Trademarks |  |
Finite Lived Intangible Assets [Line Items] |  |
Useful Life | 12 years |
Gross Carrying Amount | $ 0.0 | 3.8
Accumulated Amortization | $ 0.0 | (2.9)
Noncompete Agreements |  |
Finite Lived Intangible Assets [Line Items] |  |
Useful Life | 5 years |
Gross Carrying Amount | $ 0.0 | 2.7
Accumulated Amortization | $ 0.0 | $ (2.7)

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