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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Mar. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Component of company's intangible assets
Goodwill and intangible assets comprise the following:
 
 
 
March 31,
2013
 
September 30,
2012
 
March 31,
2012
Goodwill (not subject to amortization)
 
$
2,813.8

 
$
2,818.3

 
$
2,795.2

Intangible assets:
 
 
 
 
 
 
Customer relationships, noncompete agreements and other
 
$
690.0

 
$
691.9

 
$
693.8

Trademarks and tradenames (not subject to amortization)
 
137.0

 
137.2

 
192.0

     Gross carrying amount
 
827.0

 
829.1

 
885.8

     Accumulated amortization
 
(197.1
)
 
(170.9
)
 
(152.6
)
       Intangible assets, net
 
$
629.9

 
$
658.2

 
$
733.2