Intangible Assets, Goodwill, Acquisitions, and Divestitures (Tables)

6 Months Ended

Mar. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

Intangible assets, net, as of March 31, 2025 and September 30, 2024 consisted of the following:

		March 31, 2025					September 30, 2024
	Estimated Useful Life	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Customer relationships	6-21 yrs.	$	715.9	$	(635.3	)	$	715.9	$	(620.1	)
Total intangible assets		$	715.9	$	(635.3	)	$	715.9	$	(620.1	)

Summary of Goodwill

The following is a summary of the goodwill activity for the periods ended September 30, 2024 and March 31, 2025:

	Maintenance Services			Development Services		Total
Balance, September 30, 2023	$	1,803.4		$	218.0	$	2,021.4
Acquisitions (1)		0.1			—		0.1
Divestiture		(5.8	)		—		(5.8	)
Balance, September 30, 2024	$	1,797.7		$	218.0	$	2,015.7
Acquisitions (1)		(0.1	)		—		(0.1	)
Balance, March 31, 2025	$	1,797.6		$	218.0	$	2,015.6

(1)The acquisitions adjustment includes the immaterial impact of foreign currency adjustments during the period.