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Employee Benefit Plans (Details) - Schedule for measurement of benefit plan assets at fair value - USD ($) $ in Millions | May 31, 2016 | May 31, 2015
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets |  | $ 164.2 | $ 173.7
Cash and cash equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets |  | 4.2 | 2.4
Equity securities, U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [1] | 34.1 | 34.4
Equity securities, International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [2] | 14.9 | 16.4
Pooled, Common and Collective Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [3] | 93.5 | 101.8
Equity securities, Fixed Income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [4] | 9.8 | 10.4
Annuities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets |  | 5.5 | 6.1
Real Estate [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [5] | 2.2 | 2.2
Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets |  | 42.5 | 41.5
Level 1 [Member] | Cash and cash equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets |  | 4.2 | 2.4
Level 1 [Member] | Equity securities, U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [1] | 34.1 | 34.4
Level 1 [Member] | Equity securities, International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [2] | 4.2 | 4.7
Level 1 [Member] | Pooled, Common and Collective Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [3] | 0.0 | 0.0
Level 1 [Member] | Equity securities, Fixed Income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [4] | 0.0 | 0.0
Level 1 [Member] | Annuities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets |  | 0.0 | 0.0
Level 1 [Member] | Real Estate [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [5] | 0.0 | 0.0
Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets |  | 116.2 | 126.1
Level 2 [Member] | Cash and cash equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets |  | 0.0 | 0.0
Level 2 [Member] | Equity securities, U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [1] | 0.0 | 0.0
Level 2 [Member] | Equity securities, International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [2] | 10.7 | 11.7
Level 2 [Member] | Pooled, Common and Collective Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [3] | 93.5 | 101.8
Level 2 [Member] | Equity securities, Fixed Income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [4] | 9.8 | 10.4
Level 2 [Member] | Annuities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets |  | 0.0 | 0.0
Level 2 [Member] | Real Estate [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [5] | 2.2 | 2.2
Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets |  | 5.5 | 6.1
Level 3 [Member] | Cash and cash equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets |  | 0.0 | 0.0
Level 3 [Member] | Equity securities, U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [1] | 0.0 | 0.0
Level 3 [Member] | Equity securities, International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [2] | 0.0 | 0.0
Level 3 [Member] | Pooled, Common and Collective Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [3] | 0.0 | 0.0
Level 3 [Member] | Equity securities, Fixed Income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [4] | 0.0 | 0.0
Level 3 [Member] | Annuities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets |  | 5.5 | 6.1
Level 3 [Member] | Real Estate [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | [5] | $ 0.0 | $ 0.0
[1] | Funds which invest in a diversified portfolio of publicly traded U.S. common stocks of large-cap, medium-cap and small-cap companies. There are no restrictions on these investments.
[2] | Funds which invest in a diversified portfolio of publicly traded common stock of non-U.S. companies, primarily in Europe and Asia. There are no restrictions on these investments.
[3] | Funds which invest in bond index funds available to certain qualified retirement plans but not traded openly in any public exchanges.
[4] | Funds which invest in a diversified portfolio of publicly traded government bonds, corporate bonds and mortgage-backed securities. There are no restrictions on these investments.
[5] | Represents assets of a non-U.S. entity plan invested in a fund whose underlying investments are comprised of properties. The fund has publicly available quoted market prices and there are no restrictions on these investments.

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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