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Employee Benefit Plans (Details) - Schedule for measurement of benefit plan assets at fair value - Pension Plans [Member] - USD ($) $ in Millions | May 31, 2017 | May 31, 2016 | May 31, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | $ 161.7 | $ 164.2 |
Cash and cash equivalents [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 18.9 | 4.2 |
Equity securities, U.S. [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 13.7 | 34.1 |
Equity securities, International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [2] | 10.3 | 14.9 |
Pooled, Common and Collective Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [3] | 101.4 | 93.5 |
Fixed Income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [4] | 9.6 | 9.8 |
Annuities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 5.8 | 5.5 |
Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [5] | 2.0 | 2.2 |
U.S. [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 132.5 | 135.1 | $ 143.2
U.S. [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 31.1 | 41.6 |
U.S. [Member] | Level 1 [Member] | Cash and cash equivalents [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 18.4 | 3.3 |
U.S. [Member] | Level 1 [Member] | Equity securities, U.S. [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 12.7 | 34.1 |
U.S. [Member] | Level 1 [Member] | Equity securities, International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [2] | 0.0 | 4.2 |
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 |
U.S. [Member] | Level 1 [Member] | Fixed Income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [4] | 0.0 | 0.0 |
U.S. [Member] | Level 1 [Member] | Annuities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0.0 | 0.0 |
U.S. [Member] | Level 1 [Member] | Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [5] | 0.0 | 0.0 |
U.S. [Member] | Level 2 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 101.4 | 93.5 |
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 2 [Member] | Equity securities, U.S. [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 0.0 | 0.0 |
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 |
U.S. [Member] | Level 2 [Member] | Pooled, Common and Collective Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [3] | 101.4 | 93.5 |
U.S. [Member] | Level 2 [Member] | Fixed Income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [4] | 0.0 | 0.0 |
U.S. [Member] | Level 2 [Member] | Annuities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0.0 | 0.0 |
U.S. [Member] | Level 2 [Member] | Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [5] | 0.0 | 0.0 |
U.S. [Member] | Level 3 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0.0 | 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 |  |
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 |
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 |
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 |
U.S. [Member] | Level 3 [Member] | Fixed Income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [4] | 0.0 | 0.0 |
U.S. [Member] | Level 3 [Member] | Annuities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0.0 | 0.0 |
U.S. [Member] | Level 3 [Member] | Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [5] | 0.0 | 0.0 |
U.K. [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 29.2 | 29.1 | $ 30.5
U.K. [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1.5 | 0.9 |
U.K. [Member] | Level 1 [Member] | Cash and cash equivalents [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0.5 | 0.9 |
U.K. [Member] | Level 1 [Member] | Equity securities, U.S. [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 1.0 | 0.0 |
U.K. [Member] | Level 1 [Member] | Equity securities, International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [2] | 0.0 | 0.0 |
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 |
U.K. [Member] | Level 1 [Member] | Fixed Income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [4] | 0.0 | 0.0 |
U.K. [Member] | Level 1 [Member] | Annuities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0.0 | 0.0 |
U.K. [Member] | Level 1 [Member] | Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [5] | 0.0 | 0.0 |
U.K. [Member] | Level 2 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 21.9 | 22.7 |
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 |
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 |
U.K. [Member] | Level 2 [Member] | Equity securities, International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [2] | 10.3 | 10.7 |
U.K. [Member] | Level 2 [Member] | Pooled, Common and Collective Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [3] | 0.0 | 0.0 |
U.K. [Member] | Level 2 [Member] | Fixed Income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [4] | 9.6 | 9.8 |
U.K. [Member] | Level 2 [Member] | Annuities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0.0 | 0.0 |
U.K. [Member] | Level 2 [Member] | Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [5] | 2.0 | 2.2 |
U.K. [Member] | Level 3 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 5.8 | 5.5 |
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 |
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 |
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 |
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 |
U.K. [Member] | Level 3 [Member] | Fixed Income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [4] | 0.0 | 0.0 |
U.K. [Member] | Level 3 [Member] | Annuities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 5.8 | 5.5 |
U.K. [Member] | Level 3 [Member] | Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
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 Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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=64937038&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=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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