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Goodwill and Intangible Assets - Changes in Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Goodwill [Roll Forward]    
Goodwill, Beginning Balance $ 1,080.0 $ 967.3
Provisional additions from acquired businesses 0.0 147.8
Foreign currency translation adjustments 0.6 0.4
Goodwill, Ending Balance $ 1,080.6 $ 1,115.5