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Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2014 | Feb. 29, 2016 | May 31, 2016 | May 31, 2015 | May 31, 2014 | May 31, 2013
Income Tax And Non Income Tax Disclosure [Abstract] |  |  |  |  |  |
Settlements during the period |  | $ 4.9 | $ 2.9 | $ 0.0 | $ 1.8 |
Unrecognized tax settlement | $ 13.8 |  |  |  |  |
Undistributed earnings of foreign subsidiaries indefinitely reinvested |  |  | 63.2 |  |  |
Net deferred tax assets |  |  | 68.5 | 87.5 |  |
Noncurrent deferred income taxes |  |  |  | 6.5 |  |
Current deferred income taxes |  |  |  | 81.0 |  |
Decrease in deferred tax valuation allowance |  |  | 0.1 | 1.7 |  |
Foreign operating loss carryforwards |  |  | 115.5 |  |  |
Unrecognized tax benefits |  |  | 17.9 | 17.3 | 14.4 | $ 35.5
Income tax penalties and interest accrued |  |  | 2.3 | 1.6 | 1.1 |
Unrecognized tax benefits that would impact effective tax rate |  |  | 17.0 | 14.6 | 11.7 |
Tax (expense) benefit from income tax penalties and interest expense |  |  | (0.7) | (0.5) | $ 5.3 |
Period increase (decrease) in unrecognized tax benefits |  |  | $ (0.6) | $ (2.9) |  |

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