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Identifiable Intangible Assets (Tables) | 12 Months Ended
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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: |
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: |
Goodwill | 817.8 |
Accumulated impairment | (724.1) |
Net goodwill | $ | 93.7 |
Schedule of Intangible Assets and Goodwill [Table Text Block] | Intangible assets are presented below.
| September 30,
| 2023 |  | 2022
| (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 other | 371.5 |  |  | 371.6 |
Indefinite-lived intangible assets: |  |  |
Trade names and trademarks | 272.6 |  |  | 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, net | 325.6 |  |  | 352.5 |
Intangible assets, net | $ | 334.0 |  |  | $ | 361.2 |

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