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Taxes (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 29, 2016 | May 31, 2017 | May 31, 2016 | May 31, 2015 | Feb. 28, 2017 | May 31, 2014
Income Tax And Non Income Tax Disclosure [Abstract] |  |  |  |  |  |
Settlements during the period | $ 4.9 | $ 0.6 | $ 2.9 | $ 0.0 |  |
Undistributed earnings of foreign subsidiaries indefinitely reinvested |  | 63.2 |  |  |  |
Net deferred tax assets |  | 53.7 | 68.5 |  |  |
Decrease in deferred tax asset valuation allowance |  | 1.6 |  |  |  |
Increase in deferred tax asset valuation allowance |  |  | 0.1 |  |  |
Foreign operating loss carryforwards |  | 112.3 |  |  |  |
Unrecognized tax benefits |  | 14.1 | 17.9 | 17.3 |  | $ 14.4
Income tax penalties and interest accrued |  | 1.7 | 2.3 | 1.6 |  |
Unrecognized tax benefits that would impact effective tax rate |  | 14.1 | 17.0 | 14.6 |  |
Tax (expense) benefit from income tax penalties and interest expense |  | 0.6 | (0.7) | $ (0.5) |  |
Period increase (decrease) in unrecognized tax benefits |  | $ (3.8) | $ (0.6) |  |  |
State Sales Tax Assessment [Member] | Wisconsin [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Sales and Excise Tax Payable |  |  |  |  | $ 5.4 |

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