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Identifiable Intangible Assets (Tables)
 12 Months Ended
Sep. 30, 2023
Goodwill [Line Items]  
Schedule of Goodwill [Table Text Block] Changes in the carrying amount of goodwill for the years ended September 30, 2023 and 2022 were as follows, in millions:
Balance at September 30, 2021:
Goodwill$832.4 
Accumulated impairment (717.3)
Net goodwill 115.1 
2022 Activity:
Goodwill impairment(6.8)
Change in foreign currency exchange rates(9.7)
Balance at September 30, 2022:
Goodwill822.7 
Accumulated impairment (724.1)
Net goodwill98.6 
2023 Activity:
Change in foreign currency exchange rates(4.9)
Balance at September 30, 2023:
Goodwill817.8 
Accumulated impairment(724.1)
Net goodwill$93.7 
Schedule of Intangible Assets and Goodwill [Table Text Block]
Intangible assets are presented below.

 September 30,
 20232022
 (in millions)
Capitalized internal-use software:
Cost$38.1 $35.5 
Accumulated amortization(29.7)(26.8)
Capitalized internal-use software, net$8.4 $8.7 
Business combination-related:
Cost:
Finite-lived intangible assets:
Technology$119.6 $119.9 
Customer relationships and other371.5 371.6 
Indefinite-lived intangible assets:
Trade names and trademarks272.6 272.7 
$763.7 $764.2 
Accumulated amortization:
Technology$(95.3)$(89.5)
Customer relationships and other(342.8)(322.2)
(438.1)(411.7)
Business combination-related intangible assets, net325.6 352.5 
Intangible assets, net$334.0 $361.2