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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of Company's Goodwill and Intangible Assets
Goodwill and intangible assets comprise the following: 
 
 
December 31,
2019
 
September 30,
2019
 
December 31,
2018
Goodwill
 
$
3,482.9

 
$
3,456.4

 
$
3,154.8

Intangible assets:
 
 
 
 
 
 
Customer relationships
 
$
1,054.9

 
$
1,038.4

 
$
795.4

Trademarks and tradenames
 
16.4

 
16.2

 
7.9

Noncompete agreements and other
 
54.8

 
46.4

 
57.6

Accumulated amortization
 
(473.5
)
 
(441.8
)
 
(405.4
)
Intangible assets, net (definite-lived)
 
652.6

 
659.2

 
455.5

Trademarks and tradenames (indefinite-lived)
 
50.8

 
49.4

 
49.7

Total intangible assets, net
 
$
703.4

 
$
708.6

 
$
505.2