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Allowance for Doubtful Accounts
 12 Months Ended
Sep. 30, 2020
Allowance For Doubtful Accounts [Abstract]  
Allowance for Doubtful Accounts

16. Allowance for Doubtful Accounts

The following table summarizes changes in the valuation of the allowance for doubtful accounts (in millions):

 

Year Ended September 30,

 

Beginning

Balance

 

 

Charged to

Operations

 

 

Write-offs

 

 

Ending

Balance

 

2020

 

$

13.1

 

 

$

19.2

 

 

$

(13.1

)

 

$

19.2

 

2019

 

 

17.6

 

 

 

9.5

 

 

 

(14.0

)

 

 

13.1

 

2018

 

 

11.8

 

 

 

11.0

 

 

 

(5.2

)

 

 

17.6

 

The increase in valuation as of September 30, 2020 is primarily due to the recording of additional allowance in response to certain customer bankruptcies.