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Income Taxes (Components of Provision for Income Taxes) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2016 | Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2015 | May 31, 2017 | May 31, 2016 | May 31, 2015
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 362.0 | $ 336.4 | $ 341.4
State |  |  |  |  |  |  |  |  | 48.1 | 50.8 | 47.8
Total current |  |  |  |  |  |  |  |  | 410.1 | 387.2 | 389.2
Federal |  |  |  |  |  |  |  |  | 15.9 | 5.5 | (5.1)
State |  |  |  |  |  |  |  |  | 1.5 | 1.6 | 1.0
Total deferred |  |  |  |  |  |  |  |  | 17.4 | 7.1 | (4.1)
Income taxes | $ 105.2 | $ 105.3 | $ 109.9 | $ 107.1 | $ 98.0 | $ 101.3 | $ 106.6 | $ 88.4 | $ 427.5 | $ 394.3 | $ 385.1

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- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details
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