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Employee Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
May 31, 2021 | May 31, 2020 | May 31, 2019 | Feb. 28, 2021
Employee Benefit Plans (Details) [Line Items] |  |  |  |
Reduction in benefit obligation |  |  |  | $ 7.6
Amount recognized in Accumulated comprehensive income (loss) net of tax |  |  |  | $ 7.6
Remaining life of plan | 12 years |  |  |
Percentage of federal subsidy to sponsors of retiree health care benefit plans | 28.00% |  |  |
Cumulative reduction of its accumulated post-retirement benefit obligation | $ 0.2 | $ 1.2 | $ 1.5 |
Defined benefit plans tax expense recognized in AOCI | 2.0 | (0.1) | (0.5) |
Estimated employer contributions in 2015 | 1.7 |  |  |
Contribution to retirement plan | 6.0 | 6.7 | 7.6 |
Annuities | Level 3 |  |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |  |
Fair value of annuities | 6.0 | 5.6 |  |
U.S. | Other Postretirement Benefits |  |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |  |
Reduction in benefit obligation | $ 12.1 | $ 20.8 | $ 23.4 |
Expected long-term return on plan assets | 0.00% | 0.00% | 0.00% |
U.K. | Pension Plans |  |  |  |
Employee Benefit Plans (Details) [Line Items] |  |  |  |
Reduction in benefit obligation | $ 47.0 | $ 41.7 | $ 40.9 |
Expected long-term return on plan assets | 2.20% | 3.10% | 3.40% |

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