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Goodwill and Intangible Assets - Changes in Goodwill (Details) - USD ($)
$ in Millions
9 Months Ended
May 31, 2021
May 31, 2020
Goodwill [Roll Forward]    
Goodwill, Beginning Balance $ 1,080.0 $ 967.3
Provisional additions from acquired businesses 3.1 147.8
Adjustments to provisional amounts from acquired businesses 0.0 (21.6)
Foreign currency translation adjustments 13.1 (7.1)
Goodwill, Ending Balance $ 1,096.2 $ 1,086.4