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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Sep. 30, 2024
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, 2024, and 2023 were as follows, in millions:
Balance at September 30, 2022:
Goodwill$822.7 
Accumulated impairment (724.1)
Net goodwill 98.6 
2023 Activity:
Change in foreign currency exchange rates(4.9)
Balance at September 30, 2023:
Goodwill817.8 
Accumulated impairment (724.1)
Net goodwill93.7 
2024 Activity:
Goodwill impairment(16.3)
Change in foreign currency exchange rates3.3 
Balance at September 30, 2024:
Goodwill821.1 
Accumulated impairment(740.4)
Net goodwill$80.7 
Schedule of Intangible Assets and Goodwill [Table Text Block]
Intangible assets are presented below.

 September 30,
 20242023
 (in millions)
Capitalized internal-use software:
Cost$40.1 $38.1 
Accumulated amortization(32.4)(29.7)
Capitalized internal-use software, net$7.7 $8.4 
Business combination-related:
Cost:
Finite-lived intangible assets:
Technology$118.6 $119.6 
Customer relationships and other371.5 371.5 
Indefinite-lived intangible assets:
Trade names and trademarks272.5 272.6 
$762.6 $763.7 
Accumulated amortization:
Technology$(97.9)$(95.3)
Customer relationships and other(362.7)(342.8)
(460.6)(438.1)
Business combination-related intangible assets, net302.0 325.6 
Intangible assets, net$309.7 $334.0