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Income Taxes (Components of Provision for Income Taxes) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2020 | Feb. 29, 2020 | Nov. 30, 2019 | Aug. 31, 2019 | May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2020 | May 31, 2019 | May 31, 2018
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 265.5 | $ 258.2 | $ 289.1
State |  |  |  |  |  |  |  |  | 77.5 | 70.7 | 54.1
Total current |  |  |  |  |  |  |  |  | 343.0 | 328.9 | 343.2
Federal |  |  |  |  |  |  |  |  | (0.5) | 0.7 | (38.0)
State |  |  |  |  |  |  |  |  | (3.5) | 4.0 | 0.8
Total deferred |  |  |  |  |  |  |  |  | (4.0) | 4.7 | (37.2)
Income taxes | $ 70.9 | $ 109.7 | $ 78.3 | $ 80.1 | $ 80.1 | $ 101.0 | $ 73.5 | $ 79.0 | $ 339.0 | $ 333.6 | $ 306.0

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