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Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2018 | May 31, 2020 | May 31, 2019 | May 31, 2018 | May 31, 2017
Income Tax Contingency [Line Items] |  |  |  |  |
NOL carry forwards |  | $ 9.7 | $ 10.6 |  |
Corporate income tax rate |  | 21.00% | 21.00% | 29.20% | 35.00%
Blended statutory tax rate |  |  |  | 29.20% |
Estimated tax benefits from Tax Act |  |  | $ 160.5 |  |
Net tax benefit related to revaluation of net deferred tax liabilities |  |  | 83.5 |  |
Net tax benefit related to change in annual effective tax rate |  |  | $ 77.0 |  |
Diluted earnings per share related to revaluation of net deferred tax liabilities |  |  | $ 0.23 |  |
Diluted earnings per share related to change in annual effective tax rate |  |  | $ 0.21 |  |
Reserve for uncertain tax positions |  | $ 26.5 | $ 21.6 |  |
Income tax expense, current |  | 343.0 | 328.9 | $ 343.2 |
Impact of uncertain tax positions, if recognized, on effective income tax rate |  | 26.5 | $ 21.6 |  |
Fiscal 2012 Through Fiscal 2017 [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Decreased reserve for uncertain tax positions | $ 27.2 |  |  |  |
Income tax expense, current | $ 2.7 |  |  |  |
Federal [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
NOL carry forwards |  | $ 4.4 |  |  |
Federal [Member] | Minimum [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
NOL carry forwards, Expiration date |  | May 31, 2022 |  |  |
Federal [Member] | Maximum [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
NOL carry forwards, Expiration date |  | May 31, 2037 |  |  |
State [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
NOL carry forwards |  | $ 5.3 |  |  |
State [Member] | Minimum [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
NOL carry forwards, Expiration date |  | May 31, 2021 |  |  |
State [Member] | Maximum [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
NOL carry forwards, Expiration date |  | May 31, 2039 |  |  |

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