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Goodwill and Intangible Assets
6 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Note 7 — Goodwill and Intangible Assets

Goodwill and intangible assets comprise the following: 
 
 
March 31,
2019
 
September 30,
2018
 
March 31,
2018
Goodwill (not subject to amortization)
 
$
3,147.8

 
$
3,160.4

 
$
3,218.1

Intangible assets:
 
 
 
 
 
 
Customer relationships, noncompete agreements and other
 
$
837.3

 
$
848.6

 
$
867.0

Trademarks and tradenames
 
16.5

 
7.9

 

Accumulated amortization
 
(416.3
)
 
(393.2
)
 
(376.2
)
Intangible assets, net (definite-lived)
 
437.5

 
463.3

 
490.8

Trademarks and tradenames (indefinite-lived)
 
50.8

 
50.3

 
136.3

Total intangible assets, net
 
$
488.3

 
$
513.6

 
$
627.1


The changes in goodwill and intangible assets are primarily due to acquisitions, the effects of foreign currency translation, and a $75.0 impairment of Partnership tradenames and trademarks recorded in April 2018. Amortization expense of intangible assets was $14.5 and $13.7 for the three months ended March 31, 2019 and 2018, respectively, and $29.1 and $28.5 for the six months ended March 31, 2019 and 2018, respectively. Amortization expense included in “Cost of sales” on the Condensed Consolidated Statements of Income was not material. The estimated aggregate amortization expense of intangible assets for the remainder of Fiscal 2019 and for the next four fiscal years is as follows: remainder of Fiscal 2019$28.9; Fiscal 2020$56.5; Fiscal 2021$53.2; Fiscal 2022$50.2; Fiscal 2023$48.7.