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Goodwill and Intangible Assets
3 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Note 5 — Goodwill and Intangible Assets

Goodwill and intangible assets comprise the following: 
 
 
December 31,
2016
 
September 30,
2016
 
December 31,
2015
Goodwill (not subject to amortization)
 
$
2,935.8

 
$
2,989.0

 
$
2,965.1

Intangible assets:
 
 
 
 
 
 
Customer relationships, noncompete agreements and other
 
$
759.4

 
$
773.5

 
$
764.6

Accumulated amortization
 
(329.0
)
 
(324.8
)
 
(292.2
)
Intangible assets, net (definite-lived)
 
430.4

 
448.7

 
472.4

Trademarks and tradenames (indefinite-lived)
 
128.5

 
131.6

 
130.0

Total intangible assets, net
 
$
558.9

 
$
580.3

 
$
602.4


The changes in goodwill and intangible assets are primarily due to acquisitions and the effects of currency translation. Amortization expense of intangible assets was $12.5 and $12.8 for the three months ended December 31, 2016 and 2015, respectively. Amortization expense included in “cost of sales” on the Condensed Consolidated Statements of Income is 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$36.1; Fiscal 2018$46.7; Fiscal 2019$44.8; Fiscal 2020$43.5; Fiscal 2021$41.6.