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Employee Benefit Plans (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 30, 2018 | Feb. 14, 2018 | Nov. 30, 2018 | May 31, 2019 | May 31, 2018 | May 31, 2017
Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
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 |  |  | $ 1.5 | $ 2.3 | $ 2.5
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax |  |  | $ 2.7 |  |  |
Defined benefit plans tax expense recognized in AOCI |  |  |  | 0.5 | (20.9) | (0.4)
Estimated employer contributions in 2015 |  |  |  | 1.1 |  |
Contribution to retirement plan |  |  |  | $ 7.6 | 7.2 | 7.1
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 |  |  |  | $ 5.5 | 5.7 |
Pension Plans [Member] |  |  |  |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Cost of contracts |  |  |  | 0.0 | 0.0 |
Estimated net loss to be recognized over next twelve months |  |  |  | 1.0 |  |
Other Postretirement Benefits [Member] |  |  |  |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Cost of contracts |  |  |  | 0.0 | 0.0 |
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%
Estimated net loss to be recognized over next twelve months |  |  |  | $ 0.2 |  |
U.S. [Member] | Pension Plans [Member] |  |  |  |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Lump sum benefit payments |  |  |  |  | $ 0.0 |
Cost of contracts |  | $ 86.3 |  |  | 125.2 |
Settlement charge |  |  |  |  | $ (57.3) | $ 0.0
Expected long-term return on plan assets |  |  |  |  | 0.00% | 0.00%
Expected short-term return on plan assets |  |  |  | 4.80% | 4.80% | 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 |  |  |  | 3.40% | 3.40% | 3.90%
Expected short-term return on plan assets |  |  |  | 0.00% | 0.00% | 0.00%
Amount reclassified from Accumulated other comprehensive income (loss) [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Accumulated other comprehensive loss reversed |  |  |  |  | $ (55.0) |
Current Assets [Member] | Other Postretirement Benefits [Member] |  |  |  |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Plan assets |  |  |  | $ 0.0 | 0.0 |
Current Assets [Member] | U.S. [Member] | Pension Plans [Member] |  |  |  |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Plan assets |  |  |  |  | 1.6 |
Current Assets [Member] | U.K. [Member] | Pension Plans [Member] |  |  |  |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |  |  |  |
Plan assets |  |  |  | $ 0.0 | $ 0.0 |

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