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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2018 | Aug. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |
Tax Cuts and Jobs Act, provisional income tax expense (benefit) |  |  | $ (13.3) |  | $ 142.3
Tax Cuts and Jobs Act, net provisional income tax expense |  |  |  |  | 65.9
Tax Cuts and Jobs Act, re-measurement of U.S. deferred tax |  |  |  |  | (10.5)
Tax Cuts and Jobs Act, foreign tax impact of change in indefinite reinvestment assertion |  |  |  |  | $ 85.0
U.S. federal statutory rate |  |  | 21.00% | 25.70% |
Effective tax rate | 33.00% | 56.50% | 27.90% | 47.60% |
Tax Cuts and Jobs Act, provisional income tax expense |  |  |  | $ 30.9 |
Reduction in unrecognized tax benefits for the period |  |  |  | $ 16.1 |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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