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Employee Benefit Plans - Schedule of net periodic costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2018 | Feb. 28, 2017 | Feb. 28, 2018 | Feb. 28, 2017
Components of net periodic benefit (credit) cost: |  |  |  |
Amortization of (gain) loss |  |  | $ 1.8 | $ 3.1
Post-Retirement Benefits |  |  |  |
Components of net periodic benefit (credit) cost: |  |  |  |
Service cost | $ 0.0 | $ 0.0 | 0.0 | 0.0
Interest cost | 0.2 | 0.2 | 0.7 | 0.8
Expected return on assets | 0.0 | 0.0 | 0.0 | 0.0
Net amortization of prior service credit |  |  | 0.0 | 0.0
Benefit cost of settlement event | 0.0 | 0.0 | 0.0 | 0.0
Amortization of (gain) loss | 0.0 | (1.0) | 0.0 | 0.2
Net periodic benefit (credit) cost | 0.2 | (0.8) | 0.7 | 1.0
United States | Pension Plans |  |  |  |
Components of net periodic benefit (credit) cost: |  |  |  |
Service cost | 0.0 | 0.0 | 0.0 | 0.0
Interest cost | 0.5 | 0.8 | 1.9 | 2.4
Expected return on assets | (1.1) | (1.5) | (4.0) | (4.6)
Net amortization of prior service credit |  |  | 0.0 | 0.0
Benefit cost of settlement event | 39.6 | 0.0 | 55.0 | 0.0
Amortization of (gain) loss | 0.3 | 0.2 | 0.9 | 0.7
Net periodic benefit (credit) cost | 39.3 | (0.5) | 53.8 | (1.5)
United Kingdom | Pension Plans |  |  |  |
Components of net periodic benefit (credit) cost: |  |  |  |
Service cost | 0.0 | 0.0 | 0.0 | 0.0
Interest cost | 0.3 | 0.3 | 0.8 | 0.9
Expected return on assets | (0.3) | (0.3) | (0.8) | (0.8)
Net amortization of prior service credit |  |  | 0.0 | 0.0
Benefit cost of settlement event | 0.0 | 0.0 | 0.0 | 0.0
Amortization of (gain) loss | 0.3 | 0.2 | 0.9 | 0.6
Net periodic benefit (credit) cost | $ 0.3 | $ 0.2 | $ 0.9 | $ 0.7

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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