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Discontinued Operations, Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Jun. 30, 2025
Discontinued Operations, Goodwill, and Intangible Assets [Abstract] |
Schedule of Balance Sheet of Assets and Liabilities Held for Sale and Income Statement and Cash Flow Information of Discontinued Operations | The following table represents summarized balance sheet information of assets and liabilities held for sale (in millions):
| June 30, 2025 |  | September 30, 2024
Cash and cash equivalents | $ | — |  |  | $ | 4.0 |
Receivables and contract assets | — |  |  | 73.2 |
Current assets held for sale | $ | — |  |  | $ | 77.2 |
Investment in unconsolidated joint venture | $ | 16.9 |  |  | $ | — |
Property and equipment, net | — |  |  | 16.7 |
Other | — |  |  | 1.2 |
Write-down of assets to fair value less cost to sell | — |  |  | (17.9) |
Non-current assets held for sale | $ | 16.9 |  |  | $ | — |
Accounts payable and accrued expenses | $ | — |  |  | $ | 35.6 |
Current liabilities held for sale | $ | — |  |  | $ | 35.6 |
The following table represents summarized income statement information of discontinued operations (in millions):
| Three Months Ended |  | Nine Months Ended
| June 30, 2025 |  | June 30, 2024 |  | June 30, 2025 |  | June 30, 2024
Revenue | $ | — |  |  | $ | 37.3 |  |  | $ | 102.7 |  |  | $ | 138.4 |
Cost of revenue | — |  |  | 41.8 |  |  | 106.6 |  |  | 139.5 |
Gross loss | — |  |  | (4.5) |  |  | (3.9) |  |  | (1.1) |
Equity in losses of joint ventures | (0.1) |  |  | — |  |  | (6.1) |  |  | (3.4) |
(Loss) income on disposal activities | (58.3) |  |  | 12.7 |  |  | (75.0) |  |  | (100.4) |
Transaction costs | — |  |  | — |  |  | — |  |  | (0.2) |
(Loss) income from operations | (58.4) |  |  | 8.2 |  |  | (85.0) |  |  | (105.1) |
Other expense | (0.4) |  |  | (0.6) |  |  | (0.8) |  |  | (1.7) |
(Loss) income before taxes | (58.8) |  |  | 7.6 |  |  | (85.8) |  |  | (106.8) |
Income tax (benefit) expense | (14.9) |  |  | 1.9 |  |  | (22.0) |  |  | (1.8) |
Net (loss) income from discontinuing operations | $ | (43.9) |  |  | $ | 5.7 |  |  | $ | (63.8) |  |  | $ | (105.0) |
The significant components included in our Consolidated Statement of Cash Flows for the discontinued operations are as follows (in millions):
| Three Months Ended |  | Nine Months Ended |  |  |
| June 30, 2025 |  | June 30, 2024 |  | June 30, 2025 |  | June 30, 2024 |  |  |  |  |
Payments for capital expenditures | $ | — |  |  | $ | (0.3) |  |  | $ | — |  |  | $ | (2.4) |  |  |  |  |  |
Noncash increase in noncurrent assets held for sale due to deconsolidation of a joint venture | $ | — |  |  | $ | — |  |  | $ | 41.6 |  |  | $ | — |  |  |  |  |  |
Noncash decrease in noncontrolling interest due to deconsolidation of a joint venture | $ | — |  |  | $ | — |  |  | $ | (13.8) |  |  | $ | — |  |  |  |  |  |
Schedule of Changes in Carrying Value of Goodwill by Reportable Segment | The changes in the carrying value of goodwill by reportable segment for the nine months ended June 30, 2025 were as follows:
| September 30, 2024 |  | Foreign Exchange Impact |  | Acquired |  | June 30, 2025 |
| (in millions)
Americas | $ | 2,625.7 |  |  | $ | (2.2) |  |  | $ | — |  |  | $ | 2,623.5 |  |
International | 854.5 |  |  | 7.4 |  |  | 1.3 |  |  | 863.2 |  |
Total | $ | 3,480.2 |  |  | $ | 5.2 |  |  | $ | 1.3 |  |  | $ | 3,486.7 |  |
Schedule of Gross Amount and Accumulated Amortization of Acquired Identifiable Intangible Assets with Finite Useful Lives | The gross amounts and accumulated amortization of the Company’s acquired identifiable intangible assets with finite useful lives as of June 30, 2025 and September 30, 2024, included in intangible assets—net, in the accompanying consolidated balance sheets, were as follows:
| June 30, 2025 |  | September 30, 2024 |  |
| Gross Amount |  | Accumulated Amortization |  | Intangible Assets, Net |  | Gross Amount |  | Accumulated Amortization |  | Intangible Assets, Net |  | Amortization Period
| (in millions) |  | (years)
Backlog and Customer relationships | $ | 7.4 |  |  | $ | (2.2) |  |  | $ | 5.2 |  |  | $ | 671.7 |  |  | $ | (664.8) |  |  | $ | 6.9 |  |  | 1 - 11
Schedule of Future Amortization Expense of Intangible Assets | The following table presents estimated amortization expense of existing intangible assets for the remainder of fiscal 2025 and for the succeeding years:
Fiscal Year |  | (in millions)
2025 (three months remaining) |  | $ | 0.4 |
2026 |  | 1.5 |
2027 |  | 1.5 |
2028 |  | 1.5 |
2029 |  | 0.3 |
Total |  | $ | 5.2 |

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