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Goodwill and Intangible Assets (Tables)
3 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of Company's Goodwill and Intangible Assets
Goodwill and intangible assets comprise the following: 
 
 
December 31,
2015
 
September 30,
2015
 
December 31,
2014
Goodwill (not subject to amortization)
 
$
2,965.1

 
$
2,953.4

 
$
2,806.8

Intangible assets:
 
 
 
 
 
 
Customer relationships, noncompete agreements and other
 
$
764.6

 
$
761.1

 
$
709.3

Accumulated amortization
 
(292.2
)
 
(282.4
)
 
(271.9
)
Intangible assets, net (definite-lived)
 
472.4

 
478.7

 
437.4

Trademarks and tradenames (indefinite-lived)
 
130.0

 
131.4

 
126.3

Total intangible assets, net
 
$
602.4

 
$
610.1

 
$
563.7