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Employee Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2017 | May 31, 2016 | May 31, 2015
Employee Benefit Plans (Details) [Line Items] |  |  |
Unrecognized prior service credit | $ 0.0 |  |
Percentage of federal subsidy to sponsors of retiree health care benefit plans | 28.00% |  |
Cumulative reduction of its accumulated post-retirement benefit obligation | $ 2.5 | $ 3.1 | $ 3.0
Defined benefit plans tax expense recognized in AOCI | 0.4 | (1.8) | (2.5)
Estimated employer contributions in 2015 | 1.1 |  |
Employer contributions to defined contribution plan | 7.1 | 6.8 | $ 7.9
Annuities [Member] | Level 3 [Member] |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |
Fair value of annuities | 5.8 | $ 5.5 |
Pension Plans [Member] |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |
Estimated net loss to be recognized over next twelve months | $ 2.3 |  |
Other Postretirement Benefits [Member] |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |
Expected long-term return on plan assets | 0.00% | 0.00% | 0.00%
Estimated net loss to be recognized over next twelve months | $ 0.1 |  |
U.K. [Member] | Pension Plans [Member] |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |
Expected long-term return on plan assets | 3.90% | 4.20% | 5.10%

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- Definition Percentage of federal subsidy to sponsors of retiree health care benefit plans. + References No definition available. + Details
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- Definition Amount after tax of cost (credit) due to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as a component of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + 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 (g) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount of the reduction in the accumulated postretirement benefit obligation for the government subsidy related to prescription drug benefits attributed to past service. Disclosure relates to the first period in which an employer includes the effects of the subsidy in measuring the accumulated postretirement benefit obligation and net periodic postretirement benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39689-114964 + Details
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