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Goodwill and Intangible Assets
3 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Note 7 — Goodwill and Intangible Assets

Goodwill and intangible assets comprise the following: 
 
 
December 31,
2018
 
September 30,
2018
 
December 31,
2017
Goodwill (not subject to amortization)
 
$
3,154.8

 
$
3,160.4

 
$
3,185.5

Intangible assets:
 
 
 
 
 
 
Customer relationships, noncompete agreements and other
 
$
853.0

 
$
848.6

 
$
862.0

Trademarks and tradenames
 
7.9

 
7.9

 

Accumulated amortization
 
(405.4
)
 
(393.2
)
 
(355.0
)
Intangible assets, net (definite-lived)
 
455.5

 
463.3

 
507.0

Trademarks and tradenames (indefinite-lived)
 
49.7

 
50.3

 
134.9

Total intangible assets, net
 
$
505.2

 
$
513.6

 
$
641.9


The changes in goodwill and intangible assets are primarily due to acquisitions and the effects of foreign currency translation. Amortization expense of intangible assets was $14.6 and $14.8 for the three months ended December 31, 2018 and 2017, 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$43.4; Fiscal 2020$56.7; Fiscal 2021$53.4; Fiscal 2022$50.4; Fiscal 2023$48.9.