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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of Company's Goodwill and Intangible Assets
Goodwill and intangible assets comprise the following: 
 
 
June 30,
2015
 
September 30,
2014
 
June 30,
2014
Goodwill (not subject to amortization)
 
$
2,927.7

 
$
2,833.4

 
$
2,885.1

Intangible assets:
 
 
 
 
 
 
Customer relationships, noncompete agreements and other
 
$
761.9

 
$
712.0

 
$
717.3

Accumulated amortization
 
(268.4
)
 
(263.8
)
 
(259.0
)
Intangible assets, net (definite-lived)
 
493.5

 
448.2

 
458.3

Trademarks and tradenames (indefinite-lived)
 
135.0

 
128.2

 
132.0

Total intangible assets, net
 
$
628.5

 
$
576.4

 
$
590.3