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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of Company's Goodwill and Intangible Assets
Goodwill and intangible assets comprise the following: 
 
 
March 31,
2019
 
September 30,
2018
 
March 31,
2018
Goodwill (not subject to amortization)
 
$
3,147.8

 
$
3,160.4

 
$
3,218.1

Intangible assets:
 
 
 
 
 
 
Customer relationships, noncompete agreements and other
 
$
837.3

 
$
848.6

 
$
867.0

Trademarks and tradenames
 
16.5

 
7.9

 
—

Accumulated amortization
 
(416.3
)
 
(393.2
)
 
(376.2
)
Intangible assets, net (definite-lived)
 
437.5

 
463.3

 
490.8

Trademarks and tradenames (indefinite-lived)
 
50.8

 
50.3

 
136.3

Total intangible assets, net
 
$
488.3

 
$
513.6

 
$
627.1