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Employee Benefit Plans (Details) - Schedule of net periodic costs - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Pension Plans [Member]
Components of net periodic (benefit) cost:
Service cost	$ 0.0	$ 0.0	$ 0.0
Interest cost	6.7	7.2	6.9
Expected return on assets	(9.3)	(12.7)	(10.5)
Net amortization and deferrals	0.0	0.0	0.0
Lump sum settlement charge	4.3	1.7	0.0
Recognized net actuarial loss	1.4	1.8	2.2
Net periodic (benefit) cost	3.1	(2.0)	(1.4)
Other Postretirement Benefits [Member]
Components of net periodic (benefit) cost:
Service cost	0.0	0.0	0.0
Interest cost	1.3	1.3	1.4
Expected return on assets	0.0	0.0	0.0
Net amortization and deferrals	(0.2)	(0.2)	(0.4)
Lump sum settlement charge	0.0	0.0	0.0
Recognized net actuarial loss	1.3	2.2	3.0
Net periodic (benefit) cost	$ 2.4	$ 3.3	$ 4.0

X

- Definition

Amount of recognized net actuarial loss during the period.

+ References

No definition available.

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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to net amortization and deferrals.

+ References

No definition available.

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Expected Return on Plan Assets



-URI http://asc.fasb.org/extlink&oid=6512171



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 715



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (h)(3)



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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 715



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (h)(2)



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- Definition

The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 715



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (h)



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- Definition

Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 715



-SubTopic 30



-Section 15



-Paragraph 6



-Subparagraph (a)(1)



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- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Service Cost (Component of Net Periodic Pension Cost)



-URI http://asc.fasb.org/extlink&oid=6525008



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