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Discontinued Operations, Goodwill and Intangible Assets (Tables)
 6 Months Ended
Mar. 31, 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):

                            March 31,
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$21.9 $— 
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$21.9 $— 
Accounts payable and accrued expenses$— $35.6 
  Current liabilities held for sale$— $35.6 
The following table represents summarized income statement information of discontinued operations (in millions):
Three Months EndedSix Months Ended
March 31,
2025		March 31,
2024		March 31,
2025		March 31,
2024
Revenue$55.0 $46.5 $97.6 $101.1 
Cost of revenue51.1 45.0 101.4 97.7 
Gross profit (loss)3.9 1.5 (3.8)3.4 
Equity in losses of joint ventures(6.0)(3.4)(6.0)(3.4)
Loss on disposal activities(11.9)(109.6)(16.8)(113.1)
Transaction costs— (0.2)— (0.2)
Loss from operations(14.0)(111.7)(26.6)(113.3)
Other expense— (0.5)(0.4)(1.1)
Loss before taxes(14.0)(112.2)(27.0)(114.4)
Income tax benefit(3.7)(2.8)(7.1)(3.7)
Net loss from discontinuing operations$(10.3)$(109.4)$(19.9)$(110.7)
The significant components included in our Consolidated Statement of Cash Flows for the discontinued operations are as follows (in millions):
Three Months EndedSix Months Ended
March 31,
2025		March 31,
2024		March 31,
2025		March 31,
2024
Payments for capital expenditures$— $2.1 $0.4 $2.1 
Noncash increase in noncurrent assets held for sale due to deconsolidation of a joint venture
41.6 — 41.6 — 
Noncash decrease in noncontrolling interest due to deconsolidation of a joint venture$(13.8)$— $(13.8)$— 
Schedule of Changes in Carrying Value of Goodwill by Reportable Segment
The changes in the carrying value of goodwill by reportable segment for the six months ended March 31, 2025 were as follows:
September 30,
2024		Foreign
Exchange
Impact		AcquiredMarch 31,
2025
(in millions)
Americas$2,625.7 $(9.7)$— $2,616.0 
International854.5 (26.4)— 828.1 
Total$3,480.2 $(36.1)$— $3,444.1 
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 March 31, 2025 and September 30, 2024, included in intangible assets—net, in the accompanying consolidated balance sheets, were as follows:
March 31, 2025September 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 $(1.8)$5.6 $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 (six months remaining)$0.8 
20261.5 
20271.5 
20281.5 
20290.3 
Total$5.6