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Goodwill and Intangible Assets - Changes in Goodwill (Details) - USD ($)
$ in Millions
6 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Goodwill [Roll Forward]    
Goodwill, Beginning Balance $ 1,080.0 $ 967.3
Provisional additions from acquired businesses 0.0 147.8
Adjustments to provisional amounts from acquired businesses 0.0 (23.9)
Foreign currency translation adjustments 4.2 (1.6)
Goodwill, Ending Balance $ 1,084.2 $ 1,089.6