Employee Benefit Plans (Tables)

12 Months Ended

May 31, 2013

Pension and Other Postretirement Benefits Disclosure [Text Block]

Schedule Of Defined Benefit Plan Weighted Average Actuarial Assumptions Used In Benefit Obligations[Table Text Block]

The following table sets forth the weighted average actuarial assumptions utilized to determine the benefit obligations for the Pension Plan and the UK Pension Plan (collectively the “Pension Plans”), including the Post-Retirement Benefits, at May 31:

	Pension Plans									Post-Retirement Benefits
	2013			2012			2011			2013			2012			2011
Weighted average assumptions used to determine benefit obligations:
Discount rate		4.0	%		4.0	%		5.1	%		3.9	%		3.9	%		5.0	%
Rate of compensation increase		4.4	%		3.3	%		4.3	%		—			—			—
Weighted average assumptions used to determine net periodic benefit cost:
Discount rate		4.0	%		5.1	%		5.4	%		3.9	%		5.0	%		5.4	%
Expected long-term return on plan assets		7.3	%		7.7	%		7.5	%		—			—			—
Rate of compensation increase		3.3	%		4.3	%		4.3	%		—			—			—

Schedule of Changes in Projected Benefit Obligations [Table Text Block]

The following table sets forth the change in benefit obligation for the Pension Plans and Post-Retirement Benefits at May 31:

	Pension Plans						Post-Retirement Benefits
	2013			2012			2013			2012
Change in benefit obligation:
Benefit obligation at beginning of year	$	182.2		$	173.9		$	39.6		$	38.3
Service cost		—			—			0.0			0.0
Interest cost		6.9			8.4			1.4			1.7
Plan participants’ contributions		—			—			0.4			0.4
Actuarial losses (gains)		7.4			11.1			(2.8	)		1.7
Foreign currency translation		(0.8	)		(1.9	)		—			—
Benefits paid, including expenses		(10.1	)		(9.3	)		(2.4	)		(2.5	)
Benefit obligation at end of year	$	185.6		$	182.2		$	36.2		$	39.6

Schedule of Changes in Fair Value of Plan Assets [Table Text Block]

The following table sets forth the change in plan assets for the Pension Plans and Post-Retirement Benefits at May 31:

	Pension Plans						Post-Retirement Benefits
	2013			2012			2013			2012
Change in plan assets:
Fair value of plan assets at beginning of year	$	145.8		$	146.7		$	—		$	—
Actual return on plan assets		29.9			(0.2	)		—			—
Employer contributions		8.8			9.9			2.0			2.2
Benefits paid, including expenses		(10.1	)		(9.3	)		(2.4	)		(2.6	)
Plan participants’ contributions		—			—			0.4			0.4
Foreign currency translation		(0.6	)		(1.3	)		—			—
Fair value of plan assets at end of year	$	173.8		$	145.8		$	—		$	—

Schedule of Amounts Recognized in Balance Sheet [Table Text Block]

The following table sets forth the net underfunded status of the Pension Plans and Post-Retirement Benefits and the related amounts recognized on the Company’s Consolidated Balance Sheets at May 31:

	Pension Plans				Post-Retirement Benefits
	2013		2012		2013		2012
Current liabilities	$	—	$	—	$	2.7	$	3.4
Non-current liabilities		11.8		36.4		33.5		36.2
Net underfunded balance	$	11.8	$	36.4	$	36.2	$	39.6

Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

The following amounts were recognized in Accumulated other comprehensive loss for the Pension Plans and Post- Retirement Benefits in the Company’s Consolidated Balance Sheets at May 31:

	2013									2012
	Pension Plans			Post - Retirement Benefits			Total			Pension Plans			Post - Retirement Benefits			Total
Net actuarial gain (loss)	$	(62.1	)	$	(13.4	)	$	(75.5	)	$	(76.4	)	$	(19.2	)	$	(95.6	)
Net prior service credit		—			0.5			0.5			—			0.8			0.8
Net amount recognized in Accumulated other comprehensive income (loss)	$	(62.1	)	$	(12.9	)	$	(75.0	)	$	(76.4	)	$	(18.4	)	$	(94.8	)

Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

The following table sets forth information with respect to the Pension Plans with accumulated benefit obligations in excess of plan assets for the fiscal years ended May 31:

	2013		2012
Projected benefit obligations	$	185.6	$	182.2
Accumulated benefit obligations		184.6		181.1
Fair value of plan assets		173.8		145.8

Schedule of Net Benefit Costs [Table Text Block]

The following table sets forth the net periodic (benefit) cost for the Pension Plans and Post-Retirement Benefits for the fiscal years ended May 31:

	Pension Plans									Post - Retirement Benefits
	2013			2012			2011			2013			2012			2011
Components of net periodic (benefit) cost:
Service cost	$	—		$	—		$	0.3		$	0.0		$	0.0		$	—
Interest cost		6.9			8.4			8.9			1.4			1.7			1.9
Expected return on assets		(10.5	)		(10.8	)		(9.4	)		—			—			—
Net amortization and deferrals		—			—			—			(0.4	)		(0.6	)		(0.7	)
Settlement		—			—			4.2			—			—			—
Recognized net actuarial loss		2.2			1.4			1.8			3.0			3.8			2.6
Net periodic (benefit) cost	$	(1.4	)	$	(1.0	)	$	5.8		$	4.0		$	4.9		$	3.8

Schedule Of Defined Benefit Plan Weighted Average Asset Allocations [Table Text Block]

The following table sets forth the total weighted average asset allocations for the Pension Plans by asset category at May 31:

	2013			2012
Equity securities		69.5	%		63.5	%
Debt securities		24.0	%		26.5	%
Real estate		1.0	%		1.0	%
Other		5.5	%		9.0	%
		100.0	%		100.0	%

Schedule Of Defined Benefit Plan Assets Target Allocations [Table Text Block]

The following table sets forth the total weighted average asset allocations for the Pension Plans by asset category at May 31:

	US Pension Plan			UK Pension Plan
Equity		70	%		40	%
Debt and cash equivalents		30	%		30	%
Real estate and other		0	%		30	%
		100	%		100	%

Schedule Of Defined Benefit Plan Measurement Assets Fair Value By Asset Category [Table Text Block]

The following table sets forth the measurement of the Company’s Pension Plans’ assets at fair value by asset category at the respective dates:

	Assets at Fair Value as of May 31, 2013
		Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	3.5	$	—	$	—	$	3.5
Equity securities:
U.S. (1)		94.0		—		—		94.0
International (2)		16.3		10.4		—		26.7
Fixed Income (3)		34.4		7.4		—		41.8
Annuities		—		—		6.1		6.1
Real estate (4)		—		1.7		—		1.7
Total	$	148.2	$	19.5	$	6.1	$	173.8

		Assets at Fair Value as of May 31, 2012
		Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	7.4	$	—	$	—	$	7.4
Equity securities:
U.S. (1)		73.0		—		—		73.0
International (2)		11.2		8.3		—		19.5
Fixed Income (3)		32.2		6.4		—		38.6
Annuities		—		—		5.8		5.8
Real estate (4)		—		1.5		—		1.5
Total	$	123.8	$	16.2	$	5.8	$	145.8

Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]

The following table summarizes the changes in fair value of these Level 3 assets for the fiscal years ended May 31, 2013 and 2012:

Balance at May 31, 2011	$	5.7
Actual Return on Plan Assets:
Relating to assets still held at May 31, 2012		0.7
Relating to assets sold during the year		—
Purchases, sales and settlements, net		(0.3	)
Transfers in and/or out of Level 3		—
Foreign currency translation		(0.3	)
Balance at May 31, 2012	$	5.8
Actual Return on Plan Assets:
Relating to assets still held at May 31, 2013		0.7
Relating to assets sold during the year		—
Purchases, sales and settlements, net		(0.3	)
Transfers in and/or out of Level 3		—
Foreign currency translation		(0.1	)
Balance at May 31, 2013	$	6.1

Schedule of Expected Benefit Payments [Table Text Block]

The following table sets forth the expected future benefit payments under the Pension Plans and the Post-Retirement Benefits by fiscal year:

			Post - Retirement
	Pension Benefits		Benefit Payments		Medicare Subsidy Receipts
2014	$	19.1	$	2.9	$	0.3
2015		11.5		2.9		0.3
2016		11.6		2.9		0.3
2017		10.9		2.9		0.3
2018		10.7		2.8		0.3
2019-2023		51.1		13.2		1.6

Assumed Health Care Cost Trend Rates [Table Text Block]

Assumed health care cost trend rates at May 31:

	2013			2012
Health care cost trend rate assumed for the next fiscal year		7.5	%		7.5	%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)		5.0	%		5.0	%
Year that the rate reaches the ultimate trend rate		2021			2020

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]

Assumed health care cost trend rates could have a significant effect on the amounts reported for the post-retirement health care plan. A one percentage point change in assumed health care cost trend rates would have the following effects:

	2013			2012
Total service and interest cost - 1% increase	$	0.2		$	0.2
Total service and interest cost - 1% decrease		(0.1	)		(0.2	)
Post-retirement benefit obligation - 1% increase		4.0			4.3
Post-retirement benefit obligation - 1% decrease		(3.4	)		(3.7	)