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Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2014 | May. 31, 2015 | May. 31, 2014 | May. 31, 2013 | May. 31, 2012
Income Tax And Non Income Tax Disclosure [Abstract] |  |  |  |  |
Unrecognized tax settlement | $ 13.8 |  |  |  |
Undistributed earnings of foreign subsidiaries indefinitely reinvested |  | $ 63.2 |  |  |
Net deferred tax assets |  | 87.5 | $ 85.1 |  |
Current deferred income taxes |  | 81.0 | 81.0 |  |
Noncurrent deferred income taxes |  | 6.5 | 4.1 |  |
Decrease in deferred tax valuation allowance |  | 1.7 | 1.9 |  |
Foreign operating loss carryforwards |  | 109.1 |  |  |
Unrecognized tax benefits |  | 17.3 | 14.4 | $ 35.5 | $ 38.7
Income tax penalties and interest accrued |  | 1.6 | 1.1 | 6.5 |
Unrecognized tax benefits that would impact effective tax rate |  | 14.6 | 11.7 | 21.8 |
Tax (expense) benefit from income tax penalties and interest expense |  | (0.5) | 5.3 | $ (0.5) |
Period increase (decrease) in unrecognized tax benefits |  | $ (2.9) | $ (21.1) |  |

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