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Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2018 | Dec. 31, 2016 | May 31, 2019 | May 31, 2018 | May 31, 2017
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
NOL carry forwards | $ 5.9 | [1] |  | $ 10.6 | $ 5.9 | [1] |  |
Corporate income tax rate |  |  |  | 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 | 14.7 |  |  | $ 21.6 | $ 14.7 |  |  |
Income tax expense, current |  |  |  | 328.9 | 343.2 | [1] | $ 410.1 | [1]
Impact of uncertain tax positions, if recognized, on effective income tax rate | 14.7 |  |  | 21.6 | $ 14.7 |  |  |
Fiscal 2012 Through Fiscal 2014 [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Decreased reserve for uncertain tax positions |  |  | $ 28.9 |  |  |  |  |
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 |  |  |  | $ 5.6 |  |  |  |
Federal [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
NOL carry forwards, Expiration date |  |  |  | May 31, 2020 |  |  |  |
Federal [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
NOL carry forwards, Expiration date |  |  |  | May 31, 2036 |  |  |  |
State [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
NOL carry forwards |  |  |  | $ 5.0 |  |  |  |
State [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
NOL carry forwards, Expiration date |  |  |  | May 31, 2020 |  |  |  |
State [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
NOL carry forwards, Expiration date |  |  |  | May 31, 2039 |  |  |  |
[1] | Amounts have been adjusted to reflect the adoption of ASC Topic 606.

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