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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Component of company's intangible assets
Goodwill and intangible assets comprise the following:
 
 
 
December 31,
2012
 
September 30,
2012
 
December 31,
2011
Goodwill (not subject to amortization)
 
$
2,835.0

 
$
2,818.3

 
$
1,624.7

Intangible assets:
 
 
 
 
 
 
Customer relationships, noncompete agreements and other
 
$
694.8

 
$
691.9

 
$
248.8

Trademarks and tradenames (not subject to amortization)
 
138.4

 
137.2

 
46.4

     Gross carrying amount
 
833.2

 
829.1

 
295.2

     Accumulated amortization
 
(186.4
)
 
(170.9
)
 
(135.5
)
       Intangible assets, net
 
$
646.8

 
$
658.2

 
$
159.7