Discontinued Operations, Goodwill and Intangible Assets (Tables)

12 Months Ended

Sep. 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):

	September 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	$	18.9	$	—
Property and equipment, net	$	—	$	16.7
Other	0.1		1.2
Write-down of assets to fair value less cost to sell	—		(17.9)
Non-current assets held for sale	$	19.0	$	—
Accounts payable and accrued expenses	$	—	$	35.6
Current liabilities held for sale	$	—	$	35.6
Long-term liabilities held for sale	$	—	$	—

The following table represents summarized income statement information of discontinued operations (in millions):

	Fiscal Year Ended
	September 30, 2025		September 30, 2024		September 30, 2023
Revenue	$	97.6	$	178.2	$	212.8
Cost of revenue	101.4		181.1		223.2
Gross loss	(3.8)		(2.9)		(10.4)
Equity in losses of joint ventures	(10.1)		(3.4)		(2.9)
Loss on disposal activities	(83.8)		(97.1)		(50.6)
Transaction costs	—		(0.2)		(0.2)
Loss from operations	(97.7)		(103.6)		(64.1)
Other expense	(0.3)		(1.5)		(1.0)
Loss before taxes	(98.0)		(105.1)		(65.1)
Income tax benefit	(22.6)		(0.1)		(7.9)
Net loss from discontinued operations	$	(75.4)	$	(105.0)	$	(57.2)

The significant components included in the Consolidated Statement of Cash Flows for the discontinued operations are as follows (in millions):

	Fiscal Year Ended
	September 30, 2025		September 30, 2024		September 30, 2023
Payments for capital expenditures	$	—	$	(2.5)	$	(6.2)
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 year ended September 30, 2025 were as follows:

	September 30, 2024		Foreign Exchange Impact		Acquired		September 30, 2025
	(in millions)
Americas	$	2,625.7	$	(5.4)	$	150.1	$	2,770.4
International	854.5		0.4		75.3		930.2
Total	$	3,480.2	$	(5.0)	$	225.4	$	3,700.6

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 September 30, 2025 and 2024, included in intangible assets—net, in the accompanying consolidated balance sheets, were as follows:

	September 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	$	(2.5)	$	4.9	$	671.7	$	(664.8)	$	6.9	1 - 11
Intellectual property	178.4		—		178.4		—		—		—		5
Total	$	185.8	$	(2.5)	$	183.3	$	671.7	$	(664.8)	$	6.9

Schedule of Estimated Amortization Expense of Intangible Assets

The following table presents estimated amortization expense of existing intangible assets for the succeeding years:

Fiscal Year	(in millions)
2026	$	37.2
2027	37.2
2028	37.2
2029	36.0
2030	35.7
Total	$	183.3