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Employee Benefit Plans (Details) - Schedule of recognized in accumulated other comprehensive loss - USD ($) $ in Millions | May 31, 2018 | May 31, 2017
--- | --- | ---
Pension and postretirement adjustments: |  |
Net actuarial gain (loss) | $ (13.8) | $ (70.9)
Amount recognized in Accumulated comprehensive income (loss) before tax | (13.8) | (70.9)
Other Postretirement Benefits [Member] |  |
Pension and postretirement adjustments: |  |
Net actuarial gain (loss) | (1.3) | (3.3)
Amount recognized in Accumulated comprehensive income (loss) before tax | (1.3) | (3.3)
U.S. [Member] | Pension Plans [Member] |  |
Pension and postretirement adjustments: |  |
Net actuarial gain (loss) | 0.0 | (51.3)
Amount recognized in Accumulated comprehensive income (loss) before tax | 0.0 | (51.3)
U.K. [Member] | Pension Plans [Member] |  |
Pension and postretirement adjustments: |  |
Net actuarial gain (loss) | (12.5) | (16.3)
Amount recognized in Accumulated comprehensive income (loss) before tax | $ (12.5) | $ (16.3)

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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