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Employee Benefit Plans (Tables) | 12 Months Ended
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May. 31, 2015
Compensation and Retirement Disclosure [Abstract] |
Schedule of assumptions used | The following table sets forth the weighted average actuarial assumptions utilized to determine the benefit obligations for the Pension Plan and the UK Pension Plan (collectively the “Pension Plans”), including the Post-Retirement Benefits, at May 31:
| Pension Plans |  | Post-Retirement Benefits
| 2015 |  | 2014 |  | 2013 |  | 2015 |  | 2014 |  | 2013
Weighted average assumptions used to determine benefit obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate | 3.7 | % |  | 4.1 | % |  | 4.0 | % |  | 3.8 | % |  | 4.0 | % |  | 3.9 | %
Rate of compensation increase | 4.1 | % |  | 4.2 | % |  | 4.4 | % |  | — |  |  | — |  |  | — |
Weighted average assumptions used to determine net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate | 4.1 | % |  | 4.0 | % |  | 4.0 | % |  | 4.0 | % |  | 3.9 | % |  | 3.9 | %
Expected long-term return on plan assets | 5.4 | % |  | 7.5 | % |  | 7.3 | % |  | — |  |  | — |  |  | — |
Rate of compensation increase | 4.2 | % |  | 4.4 | % |  | 3.3 | % |  | — |  |  | — |  |  | — |
Schedule of changes in projected benefit obligations | The following table sets forth the change in benefit obligation for the Pension Plans and Post-Retirement Benefits at May 31:
| Pension Plans |  | Post-Retirement Benefits
| 2015 |  | 2014 |  | 2015 |  | 2014
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of year | $ | 180.5 |  |  | $ | 185.6 |  |  | $ | 33.4 |  |  | $ | 36.2 |
Service cost | — |  |  | — |  |  | 0.0 |  |  | 0.0 |
Interest cost | 6.7 |  |  | 7.2 |  |  | 1.3 |  |  | 1.3 |
Plan participants’ contributions | — |  |  | — |  |  | 0.3 |  |  | 0.4 |
Actuarial losses (gains) | 11.4 |  |  | (2.5 | ) |  | 3.8 |  |  | (1.9 | )
Foreign currency translation | (3.6 | ) |  | 3.7 |  |  | — |  |  | — |
Settlement | (14.4 | ) |  | (6.4 | ) |  | — |  |  | — |
Curtailment due to sale of segment | 0.1 |  |  | — |  |  | — |  |  | — |
Benefits paid, including expenses | (7.6 | ) |  | (7.1 | ) |  | (2.5 | ) |  | (2.6 | )
Benefit obligation at end of year | $ | 173.1 |  |  | $ | 180.5 |  |  | $ | 36.3 |  |  | $ | 33.4 |
Schedule of changes in fair value of plan assets | The following table sets forth the change in plan assets for the Pension Plans and Post-Retirement Benefits at May 31:
| Pension Plans |  | Post-Retirement Benefits
| 2015 |  | 2014 |  | 2015 |  | 2014
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 188.6 |  |  | $ | 173.8 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets | 8.5 |  |  | 21.1 |  |  | — |  |  | — |
Employer contributions | 1.3 |  |  | 4.6 |  |  | 2.2 |  |  | 2.2 |
Settlement | (14.4 | ) |  | (6.4 | ) |  | — |  |  | — |
Benefits paid, including expenses | (7.6 | ) |  | (7.1 | ) |  | (2.5 | ) |  | (2.6 | )
Plan participants’ contributions | — |  |  | — |  |  | 0.3 |  |  | 0.4 |
Foreign currency translation | (2.7 | ) |  | 2.6 |  |  | — |  |  | — |
Fair value of plan assets at end of year | $ | 173.7 |  |  | $ | 188.6 |  |  | $ | — |  |  | $ | — |
Schedule of amounts recognized in balance sheets | The following table sets forth the net funded status of the Pension Plans and Post-Retirement Benefits and the related amounts recognized on the Company’s Consolidated Balance Sheets at May 31:
| Pension Plans |  | Post-Retirement Benefits
| 2015 |  | 2014 |  | 2015 |  | 2014
Non-current assets | $ | 13.3 |  |  | $ | 19.4 |  |  | $ | — |  |  | $ | — |
Current liabilities | — |  |  | — |  |  | (2.6 | ) |  | (2.6 | )
Non-current liabilities | (12.6 | ) |  | (11.4 | ) |  | (33.7 | ) |  | (30.8 | )
Net funded balance | $ | 0.7 |  |  | $ | 8.0 |  |  | $ | (36.3 | ) |  | $ | (33.4 | )
Schedule of amounts recognized in other comprehensive income (loss) | The following amounts were recognized in Accumulated other comprehensive income (loss) for the Pension Plans and Post-Retirement Benefits in the Company’s Consolidated Balance Sheets at May 31:
| 2015 |  | 2014
| Pension Plans |  | Post - Retirement Benefits |  | Total |  | Pension Plans |  | Post - Retirement Benefits |  | Total
Net actuarial gain (loss) | $ | (54.0 | ) |  | $ | (11.7 | ) |  | $ | (65.7 | ) |  | $ | (47.6 | ) |  | $ | (9.3 | ) |  | $ | (56.9 | )
Net prior service credit | — |  |  | (0.0 | ) |  | — |  |  | — |  |  | 0.3 |  |  | 0.3 |
Net amount recognized in Accumulated other comprehensive income (loss) | $ | (54.0 | ) |  | $ | (11.7 | ) |  | $ | (65.7 | ) |  | $ | (47.6 | ) |  | $ | (9.0 | ) |  | $ | (56.6 | )
Schedule of impact on earnings of reclassifications out of Accumulated other comprehensive income (loss) | The following table presents the impact on earnings of reclassifications out of Accumulated other comprehensive income (loss) for the periods indicated:
| 2015 | 2014 |  | 2013
| Pension Plans |  | Post - Retirement Benefits |  | Pension Plans |  | Post - Retirement Benefits |  | Pension Plans |  | Post - Retirement Benefits
Service cost | $ | — |  |  | $ | 0.0 |  |  | $ | — |  |  | $ | 0.0 |  |  | $ | — |  |  | $ | 0.0 |
Net amortization and deferrals | — |  |  | (0.2 | ) |  | — |  |  | (0.2 | ) |  | — |  |  | (0.4 | )
Lump sum settlement charge | 4.3 |  |  | — |  |  | 1.7 |  |  | — |  |  | — |  |  | — |
Recognized net actuarial loss | 1.4 |  |  | 1.3 |  |  | 1.8 |  |  | 2.2 |  |  | 2.2 |  |  | 3.0 |
Amounts reclassified from Accumulated other comprehensive income (loss) | $ | 5.7 |  |  | $ | 1.1 |  |  | $ | 3.5 |  |  | $ | 2.0 |  |  | $ | 2.2 |  |  | $ | 2.6 |
Schedule of accumulated benefit obligations in excess of fair value of plan assets | The following table sets forth information with respect to the Pension Plans with plan assets in excess of accumulated benefit obligations for the fiscal years ended May 31:
| 2015 |  | 2014
Projected benefit obligations | $ | 173.1 |  |  | $ | 180.5 |
Accumulated benefit obligations | 172.2 |  |  | 179.5 |
Fair value of plan assets | 173.7 |  |  | 188.6 |
Schedule of net benefit costs | The following table sets forth the net periodic (benefit) cost for the Pension Plans and Post-Retirement Benefits for the fiscal years ended May 31:
| Pension Plans |  | Post - Retirement Benefits
| 2015 |  | 2014 |  | 2013 |  | 2015 |  | 2014 |  | 2013
Components of net periodic (benefit) cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 0.0 |  |  | $ | 0.0 |  |  | $ | 0.0 |
Interest cost | 6.7 |  |  | 7.2 |  |  | 6.9 |  |  | 1.3 |  |  | 1.3 |  |  | 1.4 |
Expected return on assets | (9.3 | ) |  | (12.7 | ) |  | (10.5 | ) |  | — |  |  | — |  |  | — |
Net amortization and deferrals | — |  |  | — |  |  | — |  |  | (0.2 | ) |  | (0.2 | ) |  | (0.4 | )
Lump sum settlement charge | 4.3 |  |  | 1.7 |  |  | — |  |  | — |  |  | — |  |  | — |
Recognized net actuarial loss | 1.4 |  |  | 1.8 |  |  | 2.2 |  |  | 1.3 |  |  | 2.2 |  |  | 3.0 |
Net periodic (benefit) cost | $ | 3.1 |  |  | $ | (2.0 | ) |  | $ | (1.4 | ) |  | $ | 2.4 |  |  | $ | 3.3 |  |  | $ | 4.0 |
Schedule of plan asset allocations | The following table sets forth the measurement of the Company’s Pension Plans’ assets at fair value by asset category at the respective dates:
| Assets at Fair Value as of May 31, 2015
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash and cash equivalents | $ | 2.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 2.4 |
Equity securities: |  |  |  |  |  |  |  |  |  |  |
U.S. (1) | 34.4 |  |  | — |  |  | — |  |  | 34.4 |
International (2) | 4.7 |  |  | 11.7 |  |  | — |  |  | 16.4 |
Pooled, Common and Collective Funds (3) | — |  |  | 101.8 |  |  | — |  |  | 101.8 |
Fixed Income (4) | — |  |  | 10.4 |  |  | — |  |  | 10.4 |
Annuities | — |  |  | — |  |  | 6.1 |  |  | 6.1 |
Real estate (5) | — |  |  | 2.2 |  |  | — |  |  | 2.2 |
Total | $ | 41.5 |  |  | $ | 126.1 |  |  | $ | 6.1 |  |  | $ | 173.7 |
| Assets at Fair Value as of May 31, 2014
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash and cash equivalents | $ | 7.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 7.1 |
Equity securities: |  |  |  |  |  |  |  |  |  |  |
U.S. (1) | 39.8 |  |  | — |  |  | — |  |  | 39.8 |
International (2) | 10.3 |  |  | 12.1 |  |  | — |  |  | 22.4 |
Pooled, Common and Collective Funds (3) | — |  |  | 101.3 |  |  | — |  |  | 101.3 |
Fixed Income (4) | — |  |  | 9.7 |  |  | — |  |  | 9.7 |
Annuities | — |  |  | — |  |  | 6.2 |  |  | 6.2 |
Real estate (5) | — |  |  | 2.1 |  |  | — |  |  | 2.1 |
Total | $ | 57.2 |  |  | $ | 125.2 |  |  | $ | 6.2 |  |  | $ | 188.6 |
(1) | Funds which invest in a diversified portfolio of publicly traded U.S. common stocks of large-cap, medium-cap and small-cap companies. There are no restrictions on these investments.
(2) | Funds which invest in a diversified portfolio of publicly traded common stock of non-U.S. companies, primarily in Europe and Asia. There are no restrictions on these investments.
(3) | Funds which invest in bond index funds available to certain qualified retirement plans but not traded openly in any public exchanges.
(4) | Funds which invest in a diversified portfolio of publicly traded government bonds, corporate bonds and mortgage-backed securities. There are no restrictions on these investments.
(5) | Represents assets of a non-U.S. entity plan invested in a fund whose underlying investments are comprised of properties. The fund has publicly available quoted market prices and there are no restrictions on these investments.
The following table sets forth the total weighted average asset allocations for the Pension Plans by asset category at May 31:
| 2015 |  | 2014
Equity securities | 29.2 | % |  | 33.0 | %
Debt securities | 64.6 | % |  | 58.8 | %
Real estate | 1.3 | % |  | 1.1 | %
Other | 4.9 | % |  | 7.1 | %
| 100.0 | % |  | 100.0 | %
The following table sets forth the targeted weighted average asset allocations for the Pension Plans included in the Company’s investment policy:
| U.S. Pension Plan |  | UK Pension Plan
Equity | 30 | % |  | 40 | %
Debt and cash equivalents | 70 | % |  | 30 | %
Real estate and other | 0 | % |  | 30 | %
| 100 | % |  | 100 | %
Schedule of changes in level 3 plan assets | The following table summarizes the changes in fair value of these Level 3 assets for the fiscal years ended May 31, 2015 and 2014:
Balance at May 31, 2013 | $ | 6.1 |
Actual Return on Plan Assets: |  |
Relating to assets still held at May 31, 2014 | (0.1 | )
Relating to assets sold during the year | — |
Purchases, sales and settlements, net | (0.3 | )
Transfers in and/or out of Level 3 | — |
Foreign currency translation | 0.5 |
Balance at May 31, 2014 | $ | 6.2 |
Actual Return on Plan Assets: |  |
Relating to assets still held at May 31, 2015 | 0.7 |
Relating to assets sold during the year | — |
Purchases, sales and settlements, net | (0.3 | )
Transfers in and/or out of Level 3 | — |
Foreign currency translation | (0.5 | )
Balance at May 31, 2015 | $ | 6.1 |
Schedule of expected benefit payments | The following table sets forth the expected future benefit payments under the Pension Plans and the Post-Retirement Benefits by fiscal year:
|  |  |  | Post - Retirement
| Pension Benefits |  | Benefit Payments |  | Medicare Subsidy Receipts
2016 | $ | 16.8 |  |  | $ | 2.9 |  |  | $ | 0.3 |
2017 | 10.9 |  |  | 2.8 |  |  | 0.3 |
2018 | 10.6 |  |  | 2.8 |  |  | 0.3 |
2019 | 10.5 |  |  | 2.7 |  |  | 0.3 |
2020 | 10.2 |  |  | 2.6 |  |  | 0.3 |
2020-2024 | 47.3 |  |  | 12.9 |  |  | 1.5 |
Schedule of health care cost trend rates | Assumed health care cost trend rates at May 31:
| 2015 |  | 2014
Health care cost trend rate assumed for the next fiscal year | 7.0 | % |  | 7.0 | %
Rate to which the cost trend is assumed to decline (the ultimate trend rate) | 5.0 | % |  | 5.0 | %
Year that the rate reaches the ultimate trend rate | 2022 |  |  | 2021 |
Schedule of effect of one-percentage-point change in assumed health care cost trend rates | A one percentage point change in assumed health care cost trend rates would have the following effects:
| 2015 |  | 2014
Total service and interest cost - 1% increase | $ | 0.1 |  |  | $ | 0.1 |
Total service and interest cost - 1% decrease | (0.1 | ) |  | (0.1 | )
Post-retirement benefit obligation - 1% increase | 4.2 |  |  | 3.6 |
Post-retirement benefit obligation - 1% decrease | (3.6 | ) |  | (3.1 | )

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- Definition Tabular disclosure of accumulated benefit obligations and fair values of plan assets of pension plans and/or other employee benefit plans where the accumulated benefit obligation exceeds the fair value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 + Details
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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + 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 (d)(5) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + 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 (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + 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 (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + 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 (a) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + 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) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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