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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 | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Discontinued Operations, Goodwill and Intangible Assets |  |  |
Payments for capital expenditures | $ 0.0 | $ (2.5) | $ (6.2)
Noncash increase in noncurrent assets held for sale due to deconsolidation of a joint venture | 41.6 | 0.0 | 0.0
Noncash decrease in noncontrolling interest due to deconsolidation of a joint venture | $ (13.8) | $ 0.0 | $ 0.0

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