Accounts Receivable

12 Months Ended

Dec. 31, 2017

Receivables [Abstract]

Accounts Receivable

Note 5. Accounts Receivable

Transactions affecting the allowances for doubtful accounts receivable during the years ended December 31, 2017, 2016 and 2015 were as follows:

	2017			2016			2015
Balance, beginning of year	$	6.4		$	4.6		$	3.9
Provisions charged to expense		3.9			3.1			0.5
Write-offs and other		(3.0	)		(1.3	)		0.2
Balance, end of year	$	7.3		$	6.4		$	4.6