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Income Taxes (Components of Provision for Income Taxes) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2018 | [3],[4] | Feb. 28, 2018 | [3],[4] | Nov. 30, 2017 | [3],[4] | Aug. 31, 2017 | [3],[4] | May 31, 2019 | May 31, 2018 | May 31, 2017 | [1]
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 258.2 | $ 289.1 | [1] | $ 362.0 |
State |  |  |  |  |  |  |  |  | 70.7 | 54.1 | [1] | 48.1 |
Total current |  |  |  |  |  |  |  |  | 328.9 | 343.2 | [1] | 410.1 |
Federal |  |  |  |  |  |  |  |  | 0.7 | (38.0) | [1] | 21.2 |
State |  |  |  |  |  |  |  |  | 4.0 | 0.8 | [1] | 1.5 |
Total deferred |  |  |  |  |  |  |  |  | 4.7 | (37.2) | [1],[2] | 22.7 | [2]
Income taxes | $ 80.1 | $ 101.0 | $ 73.5 | $ 79.0 | $ 86.9 | $ 4.1 | $ 106.0 | $ 109.0 | $ 333.6 | $ 306.0 | [3],[4],[5] | $ 432.8 | [5]
[1] | Amounts have been adjusted to reflect the adoption of ASC Topic 606.
[2] | Amounts have been adjusted to reflect the adoption of Accounting Standards Update ("ASU") No. 2016-18, "Statement of Cash Flows (Topic 230): Restricted Cash (a consensus of the FASB Emerging Issues Task Force)."
[3] | Amounts have been adjusted to reflect the adoption of ASC Topic 606.
[4] | As a result of the Tax Act, the effective income tax rate for the three months ended February 28, 2018 was significantly impacted by certain one-time net tax benefits. Refer to Note K of this Item 8 for further details.
[5] | Amounts have been adjusted to reflect the adoption of Accounting Standards Codification ("ASC") Topic 606, "Revenue from Contracts with Customers" ("ASC Topic 606").

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