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Discontinued Operations, Goodwill and Intangible Assets - Schedule of Significant Components Included in Statement of Cash Flows for Discontinued Operations (Details) - Held for Sale - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Discontinued Operations, Goodwill and Intangible Assets [Line Items] |  |  |  |
Payments for capital expenditures | $ 0.0 | $ (0.3) | $ 0.0 | $ (2.4)
Noncash increase in noncurrent assets held for sale due to deconsolidation of a joint venture | 0.0 | 0.0 | 41.6 | 0.0
Noncash decrease in noncontrolling interest due to deconsolidation of a joint venture | $ 0.0 | $ 0.0 | $ (13.8) | $ 0.0

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