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Employee Benefit Plans (Details) - Schedule of net periodic costs - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Components of net periodic benefit (credit) cost:
Amortization of (gain) loss			$ 3.3	$ 6.2
Pension Plans
Components of net periodic benefit (credit) cost:
Service cost	$ 0.0	$ 0.0	0.0	0.0
Interest cost	1.5	1.7	4.6	5.0
Expected return on assets	(1.9)	(2.3)	(5.8)	(7.0)
Net amortization of prior service credit	0.0	0.0	0.0	0.0
Benefit cost of settlement event	0.0	0.6	0.0	4.3
Amortization of (gain) loss	0.4	0.4	1.2	1.1
Net periodic benefit (credit) cost	0.0	0.4	0.0	3.4
Post-Retirement Benefits
Components of net periodic benefit (credit) cost:
Service cost	0.0	0.0	0.0	0.0
Interest cost	0.3	0.3	1.0	1.0
Expected return on assets	0.0	0.0	0.0	0.0
Net amortization of prior service credit	0.0	(0.1)	0.0	(0.2)
Benefit cost of settlement event	0.0	0.0	0.0	0.0
Amortization of (gain) loss	0.7	0.4	2.1	1.0
Net periodic benefit (credit) cost	$ 1.0	$ 0.6	$ 3.1	$ 1.8

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- Definition

The amount of gains or losses recognized in net periodic benefit cost.

+ 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)(4)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

+ 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)(1)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=49177896

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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

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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.

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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.

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

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6525008

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