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Goodwill and Intangible Assets
6 Months Ended
Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets

Goodwill and intangible assets comprise the following:
 
 
 
March 31,
2014
 
September 30,
2013
 
March 31,
2013
Goodwill (not subject to amortization)
 
$
2,886.0

 
$
2,871.0

 
$
2,813.8

Intangible assets:
 
 
 
 
 
 
Customer relationships, noncompete agreements and other
 
$
727.5

 
$
706.4

 
$
690.0

Trademarks and tradenames (not subject to amortization)
 
132.3

 
131.3

 
137.0

     Gross carrying amount
 
859.8

 
837.7

 
827.0

     Accumulated amortization
 
(251.6
)
 
(227.1
)
 
(197.1
)
       Intangible assets, net
 
$
608.2

 
$
610.6

 
$
629.9


We amortize customer relationship and noncompete agreement intangible assets over their estimated periods of benefit which do not exceed 15 years. Amortization expense of intangible assets was $8.9 and $22.2 in the three and six months ended March 31, 2014, respectively. Amortization expense of intangible assets was $13.6 and $26.9 in the three and six months ended March 31, 2013, respectively. No amortization is included in cost of sales in the Condensed Consolidated Statements of Income. As of March 31, 2014, our expected aggregate amortization expense of intangible assets for the remainder of Fiscal 2014 and for the next four fiscal years is as follows: remainder of Fiscal 2014$26.3; Fiscal 2015$49.9; Fiscal 2016$43.5; Fiscal 2017$36.9; Fiscal 2018$35.6.