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Intangible Assets
 12 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets INTANGIBLE ASSETS
The table below summarizes the major classes of our intangible assets:
20212020
30 SeptemberGrossAccumulated
Amortization/
Impairment		NetGrossAccumulated
Amortization/
Impairment		Net
Finite-lived:
Customer relationships$552.0 ($234.7)$317.3 $538.0 ($209.9)$328.1 
Patents and technology36.8 (16.9)19.9 39.1 (16.3)22.8 
Other80.5 (37.3)43.2 77.6 (33.7)43.9 
Total finite-lived intangible assets669.3 (288.9)380.4 654.7 (259.9)394.8 
Indefinite-lived:
Trade names and trademarks51.2 (10.9)40.3 52.2 (11.2)41.0 
Total Intangible Assets$720.5 ($299.8)$420.7 $706.9 ($271.1)$435.8 
The decrease in net intangible assets in fiscal year 2021 was primarily attributable to amortization, partially offset by intangible assets acquired through business combinations.
Amortization expense for intangible assets was $37.2, $34.5, and $33.1 in fiscal years 2021, 2020, and 2019, respectively. Refer to Note 1, 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:
2022$34.7 
202333.2 
202432.1 
202530.8 
202629.2 
Thereafter220.4 
Total$380.4 
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 2021, 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.