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Employee Benefit Plans (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2018 | Nov. 30, 2018 | May 31, 2020 | May 31, 2019 | May 31, 2018
Employee Benefit Plans (Details) [Line Items] |  |  |  |  |
Settlement charge |  |  |  |  | $ (57.3)
Percentage of federal subsidy to sponsors of retiree health care benefit plans |  |  | 28.00% |  |
Cumulative reduction of its accumulated post-retirement benefit obligation | $ 2.7 |  | $ 1.2 | $ 1.5 | 2.3
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax |  | $ 2.7 |  |  |
Defined benefit plans tax expense recognized in AOCI |  |  | 0.4 | (0.5) | (20.9)
Estimated employer contributions in 2015 |  |  | 1.0 |  |
Contribution to retirement plan |  |  | $ 6.7 | 7.6 | 7.2
Defined Benefit Plan, Prescription Drug Benefit, Net Periodic Postretirement Benefit Cost, Remaining Life |  |  | 13 years |  |
Annuities [Member] | Level 3 [Member] |  |  |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |  |  |
Fair value of annuities |  |  | $ 5.6 | 5.5 |
Pension Plans [Member] |  |  |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |  |  |
Estimated net loss to be recognized over next twelve months |  |  | 0.5 |  |
Other Postretirement Benefits [Member] |  |  |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |  |  |
Settlement charge |  |  | $ 0.0 | $ 0.0 | $ 0.0
Expected long-term return on plan assets |  |  | 0.00% | 0.00% | 0.00%
Expected short-term return on plan assets |  |  | 0.00% | 0.00% | 0.00%
U.S. [Member] | Pension Plans [Member] |  |  |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |  |  |
Settlement charge |  |  |  |  | $ (57.3)
Expected long-term return on plan assets |  |  |  |  | 0.00%
Expected short-term return on plan assets |  |  |  |  | 4.80%
U.K. [Member] | Pension Plans [Member] |  |  |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |  |  |
Settlement charge |  |  | $ 0.0 | $ 0.0 | $ 0.0
Expected long-term return on plan assets |  |  | 3.10% | 3.40% | 3.40%
Expected short-term return on plan assets |  |  | 0.00% | 0.00% | 0.00%

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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 Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + 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 (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
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