Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2016

Receivables [Abstract]

Transactions Affecting Allowance for Doubtful Accounts

Transactions affecting the allowance for doubtful accounts receivable during the years ended December 31, 2016, 2015 and 2014 were as follows:

	2016			2015			2014
Balance, beginning of year	$	26.0		$	27.0		$	28.3
Provisions charged to expense		12.1			17.8			14.9
Write-offs and other		(2.2	)		(18.8	)		(16.2	)
Balance, end of year	$	35.9		$	26.0		$	27.0