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Allowance for Doubtful Accounts
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Allowance for Doubtful Accounts Allowance for Doubtful Accounts
Allowance for doubtful accounts consists of the following at December 31:
 
2019
 
2018
 
2017
Beginning balance
$
4.6

 
$
5.4

 
$
4.0

Provision for doubtful accounts
6.1

 
5.1

 
5.4

Recovery of bad debts
2.4

 
1.9

 
—

Write-offs of bad debt
(9.1
)
 
(8.1
)
 
(4.6
)
Other
0.5

 
0.3

 
0.6

Balance at December 31,
$
4.5

 
$
4.6

 
$
5.4