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Allowance for Doubtful Accounts
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Allowance For Doubtful Accounts

6.    ALLOWANCE FOR DOUBTFUL ACCOUNTS

The allowance for doubtful accounts consisted of the following (in millions):

 

 

 

December 31,

 

 

 

2019

 

 

2018

 

 

2017

 

Balance at beginning of year

 

$

2.1

 

 

$

0.9

 

 

$

0.7

 

Provision charged to expense

 

 

1.1

 

 

 

1.2

 

 

 

0.2

 

Write-offs, less recoveries

 

 

(0.1

)

 

 

—

 

 

 

—

 

Balance at end of year

 

$

3.1

 

 

$

2.1

 

 

$

0.9

 

 

The Company recorded bad debt expense of less than 0.2% of net sales in each of 2019, 2018 and 2017.