Allowance for Doubtful Accounts

3 Months Ended

Mar. 31, 2021

Receivables [Abstract]

Allowance For Doubtful Accounts

6. ALLOWANCE FOR DOUBTFUL ACCOUNTS

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

	March 31,
	2021			2020
Balance at beginning of year	$	3.0		$	3.1
Provision charged to expense		0.1			0.1
Write-offs, less recoveries		(0.5	)		—
Balance at end of period	$	2.6		$	3.2