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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 28, 2019 | Aug. 31, 2018 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2018 | May 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Unrecognized tax benefits | $ 31.5 |  |  | $ 31.5 |  | $ 26.9
Provisional transition tax liability |  | $ 13.1 |  |  |  | $ 9.8
Provisional income tax expense |  | $ 3.3 |  |  |  |
Measurement period adjustment - income tax benefit | 3.1 |  |  |  |  |
Final transition tax liability | 9.9 |  |  | $ 9.9 |  |
Measurement period adjustment to deferred tax assets and liabilities - income tax expense | $ 0.4 |  |  |  |  |
Effective tax rate | 20.10% |  | (69.50%) | 19.30% | 0.90% |

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