Employee Benefit Plans (Tables)

3 Months Ended

Aug. 31, 2012

Schedule of Net Benefit Costs [Table Text Block]

Schedule of net periodic costs

	Pension Plans Three months ended						Post-Retirement Benefits Three months ended
	August 31, 2012			August 31, 2011			August 31, 2012			August 31, 2011
Components of net periodic benefit (credit) cost:
Service cost	$	—		$	—		$	0.0		$	0.0
Interest cost		1.7			2.1			0.4			0.5
Expected return on assets		(2.6	)		(2.7	)		—			—
Net amortization of prior service credit		—			—			(0.1	)		(0.2	)
Amortization of loss		0.5			0.3			0.9			1.0
Net periodic benefit (credit) cost	$	(0.4	)	$	(0.3	)	$	1.2		$	1.3