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Discontinued Operations, Goodwill and Intangible Assets - Schedule of Balance Sheet Information of Assets and Liabilities Held for Sale (Details) - Held for Sale - USD ($) $ in Millions | Dec. 31, 2024 | Sep. 30, 2024
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Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract] |  |
Cash and cash equivalents | $ 4.1 | $ 4.0
Receivables and contract assets | 63.0 | 73.2
Current assets held for sale | 67.1 | 77.2
Property and equipment, net | 17.1 | 16.7
Other | 1.0 | 1.2
Write-down of assets to fair value less cost to sell | (18.1) | (17.9)
Non-current assets held for sale | 0.0 | 0.0
Accounts payable and accrued expenses | 25.3 | 35.6
Current liabilities held for sale | 25.3 | 35.6
Long-term liabilities held for sale | $ 0.0 | $ 0.0

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