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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of Company's Goodwill and Intangible Assets
Goodwill and intangible assets comprise the following: 
 
 
December 31,
2018
 
September 30,
2018
 
December 31,
2017
Goodwill (not subject to amortization)
 
$
3,154.8

 
$
3,160.4

 
$
3,185.5

Intangible assets:
 
 
 
 
 
 
Customer relationships, noncompete agreements and other
 
$
853.0

 
$
848.6

 
$
862.0

Trademarks and tradenames
 
7.9

 
7.9

 
—

Accumulated amortization
 
(405.4
)
 
(393.2
)
 
(355.0
)
Intangible assets, net (definite-lived)
 
455.5

 
463.3

 
507.0

Trademarks and tradenames (indefinite-lived)
 
49.7

 
50.3

 
134.9

Total intangible assets, net
 
$
505.2

 
$
513.6

 
$
641.9