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Significant Accounting Policies - Interest Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Interest Revenue (Expense), Net [Abstract]      
Interest expense $ 36.4 $ 35.5 $ 34.1
Interest income (3.1) (2.0) (1.6)
Interest expense, net $ 33.3 $ 33.5 $ 32.5