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Revenues - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 29, 2020
Feb. 28, 2019
Feb. 29, 2020
Feb. 28, 2019
Aug. 31, 2019
Revenue from Contract with Customer [Abstract]          
Revenue recognized $ 39.6 $ 45.8 $ 131.6 $ 130.1  
Contract liabilities $ 552.6   $ 552.6   $ 207.5