Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2012

Transactions Affecting Allowance for Doubtful Accounts

Transactions affecting the allowance for doubtful accounts during the years ended December 31, 2012, 2011 and 2010 were as follows:

	2012			2011			2010
Balance, beginning of year	$	62.6		$	71.0		$	70.3
Provisions charged to expense		8.7			18.8			22.8
Write-offs and other		(21.7	)		(27.2	)		(22.1	)
Balance, end of year	$	49.6		$	62.6		$	71.0