Goodwill and Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

Changes in the carrying amount of goodwill for the years ended September 30, 2025, and 2024 were as follows (in millions):

Balance as of September 30, 2023:
Goodwill	$	817.8
Accumulated impairment	(724.1)
Net goodwill	93.7
2024 Activity:
Goodwill impairment	(16.3)
Change in foreign currency exchange rates	3.3
Balance as of September 30, 2024:
Goodwill	821.1
Accumulated impairment	(740.4)
Net goodwill	80.7
2025 Activity:
Change in foreign currency exchange rates	8.5
Balance as of September 30, 2025:
Goodwill	829.6
Accumulated impairment	(740.4)
Net goodwill	$	89.2

Schedule of Intangible Assets and Goodwill [Table Text Block]

Intangible assets are presented below:

	September 30,
	2025		2024
	(in millions)
Capitalized internal-use software:
Cost	$	42.3	$	40.1
Accumulated amortization	(34.4)		(32.4)
Capitalized internal-use software, net	$	7.9	$	7.7
Business combination-related:
Cost:
Finite-lived intangible assets:
Technology	$	122.4	$	118.6
Customer relationships and other	371.9		371.5
Indefinite-lived intangible assets:
Trade names and trademarks	273.0		272.5
	$	767.3	$	762.6
Accumulated amortization:
Technology	$	(103.2)	$	(97.9)
Customer relationships and other	(364.7)		(362.7)
	(467.9)		(460.6)
Business combination-related intangible assets, net	299.4		302.0
Intangible assets, net	$	307.3	$	309.7