Allowance for Doubtful Accounts (Tables)

3 Months Ended

Mar. 31, 2022

Receivables [Abstract]

Summary of Allowance for Doubtful Accounts

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

	March 31,
	2022		2021
Balance at beginning of year	$	2.1	$	3.0
Provision charged to expense		0.4		0.1
Write-offs, less recoveries		—		(0.5	)
Balance at end of period	$	2.5	$	2.6