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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of Company's Goodwill and Intangible Assets
Goodwill and intangible assets comprise the following: 
 
 
March 31,
2018
 
September 30,
2017
 
March 31,
2017
Goodwill (not subject to amortization)
 
$
3,218.1

 
$
3,107.2

 
$
2,948.4

Intangible assets:
 
 
 
 
 
 
Customer relationships, noncompete agreements and other
 
$
867.0

 
$
817.8

 
$
764.3

Accumulated amortization
 
(376.2
)
 
(340.2
)
 
(342.4
)
Intangible assets, net (definite-lived)
 
490.8

 
477.6

 
421.9

Trademarks and tradenames (indefinite-lived)
 
136.3

 
134.1

 
129.1

Total intangible assets, net
 
$
627.1

 
$
611.7

 
$
551.0