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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of Company's Goodwill and Intangible Assets
Goodwill and intangible assets comprise the following: 
 
 
December 31,
2017
 
September 30,
2017
 
December 31,
2016
Goodwill (not subject to amortization)
 
$
3,185.5

 
$
3,107.2

 
$
2,935.8

Intangible assets:
 
 
 
 
 
 
Customer relationships, noncompete agreements and other
 
$
862.0

 
$
817.8

 
$
759.4

Accumulated amortization
 
(355.0
)
 
(340.2
)
 
(329.0
)
Intangible assets, net (definite-lived)
 
507.0

 
477.6

 
430.4

Trademarks and tradenames (indefinite-lived)
 
134.9

 
134.1

 
128.5

Total intangible assets, net
 
$
641.9

 
$
611.7

 
$
558.9