Employee Benefit Plans (Tables)

9 Months Ended

Feb. 29, 2012

Schedule of Net Benefit Costs [Table Text Block]

	Pension Plans Three months ended						Post-Retirement Benefits Three months ended
	February 29, 2012			February 28, 2011			February 29, 2012			February 28, 2011
Components of net periodic benefit costs:
Service cost	$	—		$	0.1		$	0.0		$	0.0
Interest cost		2.1			2.2			0.4			0.5
Expected return on assets		(2.7	)		(2.3	)		—			—
Net amortization of prior service credit		—			—			(0.2	)		(0.2	)
Amortization of loss		0.3			0.3			0.9			0.7
Settlement of Canadian plan		—			0.2			—			—
Net periodic benefit (credit) costs	$	(0.3	)	$	0.5		$	1.1		$	1.0

	Pension Plans Nine months ended						Post-Retirement Benefits Nine months ended
	February 29, 2012			February 28, 2011			February 29, 2012			February 28, 2011
Components of net periodic benefit costs:
Service cost	$	—		$	0.2		$	0.0		$	0.0
Interest cost		6.3			6.6			1.4			1.4
Expected return on assets		(8.1	)		(7.0	)		—			—
Net amortization of prior service credit		—			—			(0.5	)		(0.5	)
Amortization of loss		1.0			1.4			2.9			1.9
Settlement of Canadian plan		—			3.6			—			—
Net periodic benefit (credit) costs	$	(0.8	)	$	4.8		$	3.8		$	2.8