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GOODWILL AND INTANGIBLE ASSETS (Tables)
 12 Months Ended
Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in the Carrying Amount of Goodwill by Reporting Segment
Goodwill, by segment, consists of the following.
(in millions)GPCH&GTotal
As of September 30, 2023$512.1 $342.6 $854.7 
Foreign currency impact10.2 — 10.2 
As of September 30, 2024522.3 342.6 864.9 
Foreign currency impact1.9 — 1.9 
As of September 30, 2025$524.2 $342.6 $866.8 
Schedule of Carrying Value and Accumulated Amortization for Intangible Assets
The carrying value of indefinite lived intangible assets and definite lived intangible assets subject to amortization and accumulated amortization are as follows.
20252024
(in millions)
Gross Carrying AmountAccumulated AmortizationNetGross Carrying AmountAccumulated AmortizationNet
Amortizable intangible assets
Customer relationships
$621.3 $(465.9)$155.4 $641.8 $(452.3)$189.5 
Technology assets
75.3 (46.1)29.2 75.3 (41.0)34.3 
Tradenames
44.4 (12.9)31.5 27.9 (10.9)17.0 
Total amortizable intangible assets741.0 (524.9)216.1 745.0 (504.2)240.8 
Indefinite-lived intangible assets - tradenames721.5 — 721.5 749.6 — 749.6 
Total intangible assets$1,462.5 $(524.9)$937.6 $1,494.6 $(504.2)$990.4 
Amortization expense on intangible assets for the years ended September 30, 2025, 2024, and 2023 is as follows.
(in millions)202520242023
Amortization expense$41.6 $44.5 $42.3 
Schedule of Future Amortization Expense
Excluding the impact of any future acquisitions or changes in foreign currency, the Company anticipates the annual amortization expense of intangible assets for the next five fiscal years will be as follows:
(in millions)
Amortization
2026$41.2 
202741.1 
202839.4 
202936.1 
203015.7