Allowance for Doubtful Accounts (Tables)

12 Months Ended

May 31, 2013

Allowance for Doubtful Accounts

Schedule of allowance for doubtful accounts

	May 31,
	2013			2012			2011
Balance, beginning of year	$	6.5		$	5.7		$	4.8
Provision charged to operations		6.8			2.4			1.3
Deductions for accounts written off, net of recoveries		(4.6	)		(1.6	)		(0.4	)
Balance, end of year	$	8.7		$	6.5		$	5.7