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Goodwill and Intangible Assets - Changes in Goodwill (Details) - USD ($)
$ in Millions
9 Months Ended
May 31, 2020
May 31, 2019
Goodwill [Roll Forward]    
Goodwill, Beginning Balance $ 967.3 $ 970.6
Provisional additions from acquired businesses 147.8 0.0
Adjustments to provisional amounts from acquired businesses (21.6) (0.2)
Foreign currency translation adjustments (7.1) (6.3)
Goodwill, Ending Balance $ 1,086.4 $ 964.1