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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Nov. 30, 2018 | Nov. 30, 2017
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 |
Tax Cuts and Jobs Act, income tax expense, net | $ 129.0 |
U.S. federal statutory rate | 21.00% | 35.00%

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