Allowance for Doubtful Accounts (Tables)

9 Months Ended

Sep. 30, 2020

Receivables [Abstract]

Summary of Allowance for Doubtful Accounts

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

	September 30,
	2020			2019
Balance at beginning of year	$	3.1		$	2.1
Provision charged to expense		0.2			0.6
Write-offs, less recoveries		(0.3	)		(0.1	)
Balance at end of period	$	3.0		$	2.6