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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of Company's Goodwill and Intangible Assets
Goodwill and intangible assets comprise the following: 
 
 
March 31,
2017
 
September 30,
2016
 
March 31,
2016
Goodwill (not subject to amortization)
 
$
2,948.4

 
$
2,989.0

 
$
2,998.6

Intangible assets:
 
 
 
 
 
 
Customer relationships, noncompete agreements and other
 
$
764.3

 
$
773.5

 
$
778.3

Accumulated amortization
 
(342.4
)
 
(324.8
)
 
(312.3
)
Intangible assets, net (definite-lived)
 
421.9

 
448.7

 
466.0

Trademarks and tradenames (indefinite-lived)
 
129.1

 
131.6

 
132.2

Total intangible assets, net
 
$
551.0

 
$
580.3

 
$
598.2