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Employee Benefit Plans (Details) - Schedule Of Amounts Recognized In Balance Sheet - USD ($) $ in Millions | May 31, 2018 | May 31, 2017
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Other Postretirement Benefits [Member] |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |
Current liabilities | $ (2.2) | $ (2.1)
Non-current liabilities | (24.6) | (26.7)
Net funded balance | (26.8) | (28.8)
U.S. [Member] | Pension Plans [Member] |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |
Current liabilities | 0.0 | 0.0
Non-current liabilities | 0.0 | 0.0
Net funded balance | 1.6 | 4.7
U.K. [Member] | Pension Plans [Member] |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |
Current liabilities | 0.0 | 0.0
Non-current liabilities | (9.2) | (12.5)
Net funded balance | (9.2) | (12.5)
Current Assets [Member] | Other Postretirement Benefits [Member] |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |
Plan assets | 0.0 | 0.0
Current Assets [Member] | U.S. [Member] | Pension Plans [Member] |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |
Plan assets | 1.6 | 4.7
Current Assets [Member] | U.K. [Member] | Pension Plans [Member] |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |
Plan assets | 0.0 | 0.0
Noncurrent Assets [Member] | Other Postretirement Benefits [Member] |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |
Plan assets | 0.0 | 0.0
Noncurrent Assets [Member] | U.S. [Member] | Pension Plans [Member] |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |
Plan assets | 0.0 | 0.0
Noncurrent Assets [Member] | U.K. [Member] | Pension Plans [Member] |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |
Plan assets | $ 0.0 | $ 0.0

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