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Revenues - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Aug. 31, 2020
Revenue from Contract with Customer [Abstract]          
Revenue recognized $ 34.2 $ 50.5 $ 126.2 $ 182.0  
Contract liabilities $ 318.8   $ 318.8   $ 139.1