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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of Company's Goodwill and Intangible Assets
Goodwill and intangible assets comprise the following: 
 
 
June 30,
2018
 
September 30,
2017
 
June 30,
2017
Goodwill (not subject to amortization)
 
$
3,169.0

 
$
3,107.2

 
$
3,032.3

Intangible assets:
 
 
 
 
 
 
Customer relationships, noncompete agreements and other
 
$
852.5

 
$
817.8

 
$
801.6

Trademarks and tradenames
 
7.9

 
—

 
—

Accumulated amortization
 
(381.2
)
 
(340.2
)
 
(362.8
)
Intangible assets, net (definite-lived)
 
479.2

 
477.6

 
438.8

Trademarks and tradenames (indefinite-lived)
 
50.6

 
134.1

 
132.4

Total intangible assets, net
 
$
529.8

 
$
611.7

 
$
571.2