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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Component of company's intangible assets
Goodwill and intangible assets comprise the following:
 
 
 
December 31,
2013
 
September 30,
2013
 
December 31,
2012
Goodwill (not subject to amortization)
 
$
2,884.5

 
$
2,871.0

 
$
2,835.0

Intangible assets:
 
 
 
 
 
 
Customer relationships, noncompete agreements and other
 
$
709.6

 
$
706.4

 
$
694.8

Trademarks and tradenames (not subject to amortization)
 
132.2

 
131.3

 
138.4

     Gross carrying amount
 
841.8

 
837.7

 
833.2

     Accumulated amortization
 
(243.0
)
 
(227.1
)
 
(186.4
)
       Intangible assets, net
 
$
598.8

 
$
610.6

 
$
646.8