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Goodwill and Intangible Assets
9 Months Ended
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Note 5 — Goodwill and Intangible Assets

Goodwill and intangible assets comprise the following: 
 
 
June 30,
2017
 
September 30,
2016
 
June 30,
2016
Goodwill (not subject to amortization)
 
$
3,032.3

 
$
2,989.0

 
$
2,981.3

Intangible assets:
 
 
 
 
 
 
Customer relationships, noncompete agreements and other
 
$
801.6

 
$
773.5

 
$
778.1

Accumulated amortization
 
(362.8
)
 
(324.8
)
 
(321.3
)
Intangible assets, net (definite-lived)
 
438.8

 
448.7

 
456.8

Trademarks and tradenames (indefinite-lived)
 
132.4

 
131.6

 
131.1

Total intangible assets, net
 
$
571.2

 
$
580.3

 
$
587.9


The changes in goodwill and intangible assets are primarily due to acquisitions and the effects of currency translation. Amortization expense of intangible assets was $12.6 and $13.4 for the three months ended June 30, 2017 and 2016, respectively. Amortization expense of intangible assets was $37.5 and $41.4 for the nine months ended June 30, 2017 and 2016, 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 2017 and for the next four fiscal years is as follows: remainder of Fiscal 2017$12.6; Fiscal 2018$49.8; Fiscal 2019$47.9; Fiscal 2020$46.5; Fiscal 2021$44.6.