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Identifiable Intangible Assets (Tables)
 12 Months Ended
Sep. 30, 2022
Goodwill [Line Items]  
Schedule of Goodwill [Table Text Block] Changes in the carrying amount of goodwill for the years ended September 30, 2022 and 2021 were as follows:
Schedule of Intangible Assets and Goodwill [Table Text Block] Intangible assets are presented below.
 September 30,
 20222021
 (in millions)
Capitalized internal-use software:
Cost$35.5 $34.1 
Accumulated amortization(26.8)(24.1)
Capitalized internal-use software, net$8.7 $10.0 
Business combination-related:
Cost:
Finite-lived intangible assets:
Technology119.9 123.5 
Customer relationships and other371.6 373.0 
Indefinite-lived intangible assets:
Trade names and trademarks272.7 273.8 
$764.2 $770.3 
Accumulated amortization:
Technology(89.5)(85.8)
Customer relationships and other(322.2)(302.0)
(411.7)(387.8)
Business combination-related intangible assets, net352.5 382.5 
Intangible assets, net$361.2 $392.5