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Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 28, 2018 | Feb. 28, 2017 | Nov. 30, 2017 | Feb. 28, 2018 | Feb. 28, 2017 | Dec. 31, 2018 | May 31, 2018 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Effective income tax rate | 11.70% | 34.20% |  | 27.70% | 34.10% |  |  |
Corporate income tax rate |  |  |  |  |  |  |  | 35.00%
Subsequent Event [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Blended statutory tax rate |  |  |  |  |  |  | 29.20% |
Diluted earnings per share related to change in net deferred tax liabilities | $ 0.06 |  |  | $ 0.06 |  |  |  |
Diluted earnings per share related to change in annual effective tax rate |  |  | $ 0.10 |  |  |  |  |
Scenario, Plan [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Corporate income tax rate |  |  |  |  |  | 21.00% |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Estimated tax benefits | $ 56.9 |  |  | $ 56.9 |  |  |  |
Net tax benefit related to change in net deferred tax liabilities | $ 20.8 |  |  | $ 20.8 |  |  |  |
Net tax benefit related to change in annual effective tax rate |  |  | $ 36.1 |  |  |  |  |

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