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Goodwill and Intangible Assets - Changes in Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Goodwill [Roll Forward]    
Goodwill, Beginning Balance $ 967.3 $ 970.6
Additions from acquired businesses 147.8 0.0
Foreign currency translation adjustments 0.4 (3.7)
Goodwill, Ending Balance $ 1,115.5 $ 966.9