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Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2017 | Feb. 28, 2018 | Feb. 29, 2016 | May 31, 2018 | May 31, 2017 | May 31, 2016 | May 31, 2015
Income Tax And Non Income Tax Disclosure [Abstract] |  |  |  |  |  |  |
Settlements during the period |  |  | $ 4.9 | $ 1.9 | $ 0.6 | $ 2.9 |
Net deferred tax assets |  |  |  | 25.2 | 53.7 |  |
Decrease in deferred tax asset valuation allowance |  |  |  | (0.3) |  |  |
Increase in deferred tax asset valuation allowance |  |  |  |  | 1.6 |  |
Foreign operating loss carryforwards |  |  |  | 110.2 |  |  |
Unrecognized tax benefits |  |  |  | 10.1 | 14.1 | 17.9 | $ 17.3
Income tax penalties and interest accrued |  |  |  | 1.8 | 1.7 | 2.3 |
Unrecognized tax benefits that would impact effective tax rate |  |  |  | 10.1 | 14.1 | 17.0 |
Tax (expense) benefit from income tax penalties and interest expense |  |  |  | 0.1 | (0.6) | (0.5) |
Period increase (decrease) in unrecognized tax benefits |  |  |  | (4.0) | (3.8) |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Earnings (loss) from continuing operations before income taxes |  |  |  | (1.5) | 87.9 | 68.7 |
Remeasurement expense | $ 5.7 |  |  |  |  |  |
State Sales Tax Assessment [Member] | Wisconsin [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Sales and Excise Tax Payable | $ 5.4 |  |  |  |  |  |
Pension Plans [Member] | U.S. [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Settlement charge |  | $ (57.3) |  | $ (57.3) | $ 0.0 | $ 0.0 |

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