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Employee Benefit Plans (Details) - Schedule for measurement of benefit plan assets at fair value - USD ($) $ in Millions | May 31, 2018 | May 31, 2017 | May 31, 2016
--- | --- | --- | ---
U.S. [Member] | Level 2 [Member] | Cash and cash equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  |  | $ 0.0 |  |
U.S. [Member] | Level 3 [Member] | Cash and cash equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  |  | 0.0 |  |
Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | $ 32.4 |  | 161.7 |  |
Pension Plans [Member] | Cash and cash equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 2.4 |  | 18.9 |  |
Pension Plans [Member] | Equity securities, U.S. [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] | 1.5 |  | 13.7 |  |
Pension Plans [Member] | Equity securities, International [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 10.4 |  | 10.3 |  |
Pension Plans [Member] | Pooled, Common and Collective Funds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 10.1 |  | 101.4 | [4] |
Pension Plans [Member] | Fixed Income [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [5] |  |  | 9.6 |  |
Pension Plans [Member] | Annuities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 5.7 |  | 5.8 |  |
Pension Plans [Member] | Real Estate [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 2.3 | [5] | 2.0 | [6] |
Pension Plans [Member] | U.S. [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 1.6 |  | 132.5 |  | $ 135.1
Pension Plans [Member] | U.S. [Member] | Level 1 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 1.6 |  | 31.1 |  |
Pension Plans [Member] | U.S. [Member] | Level 1 [Member] | Cash and cash equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 1.6 |  | 18.4 |  |
Pension Plans [Member] | U.S. [Member] | Level 1 [Member] | Equity securities, U.S. [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] | 0.0 |  | 12.7 |  |
Pension Plans [Member] | U.S. [Member] | Level 1 [Member] | Equity securities, International [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 0.0 |  | 0.0 |  |
Pension Plans [Member] | U.S. [Member] | Level 1 [Member] | Pooled, Common and Collective Funds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 0.0 |  | 0.0 | [4] |
Pension Plans [Member] | U.S. [Member] | Level 1 [Member] | Fixed Income [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [5] |  |  | 0.0 |  |
Pension Plans [Member] | U.S. [Member] | Level 1 [Member] | Annuities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0.0 |  | 0.0 |  |
Pension Plans [Member] | U.S. [Member] | Level 1 [Member] | Real Estate [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0.0 | [5] | 0.0 | [6] |
Pension Plans [Member] | U.S. [Member] | Level 2 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0.0 |  | 101.4 |  |
Pension Plans [Member] | U.S. [Member] | Level 2 [Member] | Cash and cash equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0.0 |  |  |  |
Pension Plans [Member] | U.S. [Member] | Level 2 [Member] | Equity securities, U.S. [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] | 0.0 |  | 0.0 |  |
Pension Plans [Member] | U.S. [Member] | Level 2 [Member] | Equity securities, International [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 0.0 |  | 0.0 |  |
Pension Plans [Member] | U.S. [Member] | Level 2 [Member] | Pooled, Common and Collective Funds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 0.0 |  | 101.4 | [4] |
Pension Plans [Member] | U.S. [Member] | Level 2 [Member] | Fixed Income [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [5] |  |  | 0.0 |  |
Pension Plans [Member] | U.S. [Member] | Level 2 [Member] | Annuities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0.0 |  | 0.0 |  |
Pension Plans [Member] | U.S. [Member] | Level 2 [Member] | Real Estate [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0.0 | [5] | 0.0 | [6] |
Pension Plans [Member] | U.S. [Member] | Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0.0 |  | 0.0 |  |
Pension Plans [Member] | U.S. [Member] | Level 3 [Member] | Cash and cash equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0.0 |  |  |  |
Pension Plans [Member] | U.S. [Member] | Level 3 [Member] | Equity securities, U.S. [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] | 0.0 |  | 0.0 |  |
Pension Plans [Member] | U.S. [Member] | Level 3 [Member] | Equity securities, International [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 0.0 |  | 0.0 |  |
Pension Plans [Member] | U.S. [Member] | Level 3 [Member] | Pooled, Common and Collective Funds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 0.0 |  | 0.0 | [4] |
Pension Plans [Member] | U.S. [Member] | Level 3 [Member] | Fixed Income [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [5] |  |  | 0.0 |  |
Pension Plans [Member] | U.S. [Member] | Level 3 [Member] | Annuities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0.0 |  | 0.0 |  |
Pension Plans [Member] | U.S. [Member] | Level 3 [Member] | Real Estate [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0.0 | [5] | 0.0 | [6] |
Pension Plans [Member] | U.K. [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 30.8 |  | 29.2 |  | $ 29.1
Pension Plans [Member] | U.K. [Member] | Level 1 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 12.7 |  | 11.8 |  |
Pension Plans [Member] | U.K. [Member] | Level 1 [Member] | Cash and cash equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0.8 |  | 0.5 |  |
Pension Plans [Member] | U.K. [Member] | Level 1 [Member] | Equity securities, U.S. [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] | 1.5 |  | 1.0 |  |
Pension Plans [Member] | U.K. [Member] | Level 1 [Member] | Equity securities, International [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 10.4 |  | 10.3 |  |
Pension Plans [Member] | U.K. [Member] | Level 1 [Member] | Pooled, Common and Collective Funds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 0.0 |  | 0.0 | [4] |
Pension Plans [Member] | U.K. [Member] | Level 1 [Member] | Fixed Income [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [5] |  |  | 0.0 |  |
Pension Plans [Member] | U.K. [Member] | Level 1 [Member] | Annuities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0.0 |  | 0.0 |  |
Pension Plans [Member] | U.K. [Member] | Level 1 [Member] | Real Estate [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0.0 | [5] | 0.0 | [6] |
Pension Plans [Member] | U.K. [Member] | Level 2 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 12.4 |  | 11.6 |  |
Pension Plans [Member] | U.K. [Member] | Level 2 [Member] | Cash and cash equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0.0 |  | 0.0 |  |
Pension Plans [Member] | U.K. [Member] | Level 2 [Member] | Equity securities, U.S. [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] | 0.0 |  | 0.0 |  |
Pension Plans [Member] | U.K. [Member] | Level 2 [Member] | Equity securities, International [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 0.0 |  | 0.0 |  |
Pension Plans [Member] | U.K. [Member] | Level 2 [Member] | Pooled, Common and Collective Funds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 10.1 |  | 0.0 | [4] |
Pension Plans [Member] | U.K. [Member] | Level 2 [Member] | Fixed Income [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [5] |  |  | 9.6 |  |
Pension Plans [Member] | U.K. [Member] | Level 2 [Member] | Annuities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0.0 |  | 0.0 |  |
Pension Plans [Member] | U.K. [Member] | Level 2 [Member] | Real Estate [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 2.3 | [5] | 2.0 | [6] |
Pension Plans [Member] | U.K. [Member] | Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 5.7 |  | 5.8 |  |
Pension Plans [Member] | U.K. [Member] | Level 3 [Member] | Cash and cash equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0.0 |  | 0.0 |  |
Pension Plans [Member] | U.K. [Member] | Level 3 [Member] | Equity securities, U.S. [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] | 0.0 |  | 0.0 |  |
Pension Plans [Member] | U.K. [Member] | Level 3 [Member] | Equity securities, International [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 0.0 |  | 0.0 |  |
Pension Plans [Member] | U.K. [Member] | Level 3 [Member] | Pooled, Common and Collective Funds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 0.0 |  | 0.0 | [4] |
Pension Plans [Member] | U.K. [Member] | Level 3 [Member] | Fixed Income [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [5] |  |  | 0.0 |  |
Pension Plans [Member] | U.K. [Member] | Level 3 [Member] | Annuities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 5.7 |  | 5.8 |  |
Pension Plans [Member] | U.K. [Member] | Level 3 [Member] | Real Estate [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | $ 0.0 | [5] | $ 0.0 | [6] |
[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 stocks of non-U.S. companies, primarily in Europe and Asia. There are no restrictions on these investments.
[3] | Funds which invest in UK government bonds and bond index-linked investments and interest rate and inflation swaps. There are no restrictions on these investments.
[4] | Funds which invest in bond index funds available to certain qualified retirement plans but not traded openly in any public exchanges. There are no restrictions on these investments.
[5] | 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.
[6] | 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 Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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