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Intangible Assets
 12 Months Ended
Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets INTANGIBLE ASSETS
The table below summarizes the major classes of our intangible assets:
20222021
30 SeptemberGrossAccumulated
Amortization/
Impairment		NetGrossAccumulated
Amortization/
Impairment		Net
Finite-lived:
Customer relationships$487.5 ($226.3)$261.2 $552.0 ($234.7)$317.3 
Patents and technology33.1 (16.3)16.8 36.8 (16.9)19.9 
Other73.4 (37.0)36.4 80.5 (37.3)43.2 
Total finite-lived intangible assets$594.0 ($279.6)$314.4 $669.3 ($288.9)$380.4 
Indefinite-lived:
Trade names and trademarks42.2 (9.1)33.1 51.2 (10.9)40.3 
Total intangible assets$636.2 ($288.7)$347.5 $720.5 ($299.8)$420.7 
The decrease in net intangible assets in fiscal year 2022 was primarily attributable to currency impacts due to the strengthening of the U.S Dollar as well as amortization.
Amortization expense for intangible assets was $35.5, $37.2, and $34.5 in fiscal years 2022, 2021, and 2020, respectively. Refer to Note 1, Basis of Presentation and Major Accounting Policies, for the amortization periods for each major class of intangible assets.
The table below details the amount of amortization expense expected to be recorded for our finite-lived intangible assets in each of the next five years and thereafter:
2023$29.9 
202428.8 
202527.7 
202626.7 
202726.3 
Thereafter175.0 
Total$314.4 
Indefinite-lived intangible assets are subject to impairment testing at least annually or more frequently if events or changes in circumstances indicate that potential impairment exists. The impairment test for indefinite-lived intangible assets involves calculating the fair value of the indefinite-lived intangible assets and comparing the fair value to their carrying value. If the fair value is less than the carrying value, the difference is recorded as an impairment loss. During the fourth quarter of fiscal year 2022, we conducted our annual impairment test of indefinite-lived intangible assets and determined that the fair value of all our intangible assets exceeded their carrying value.