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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of Company's Goodwill and Intangible Assets
Goodwill and intangible assets comprise the following: 
 
 
March 31,
2016
 
September 30,
2015
 
March 31,
2015
Goodwill (not subject to amortization)
 
$
2,998.6

 
$
2,953.4

 
$
2,731.2

Intangible assets:
 
 
 
 
 
 
Customer relationships, noncompete agreements and other
 
$
778.3

 
$
761.1

 
$
670.2

Accumulated amortization
 
(312.3
)
 
(282.4
)
 
(254.1
)
Intangible assets, net (definite-lived)
 
466.0

 
478.7

 
416.1

Trademarks and tradenames (indefinite-lived)
 
132.2

 
131.4

 
121.4

Total intangible assets, net
 
$
598.2

 
$
610.1

 
$
537.5