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Earnings Per Share - Basic and Diluted Earnings per Share, Treasury Stock Method (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
May 31, 2020
Feb. 29, 2020
Nov. 30, 2019
May 31, 2019
Feb. 28, 2019
Nov. 30, 2018
May 31, 2020
May 31, 2019
Earnings Per Share [Abstract]                
Net income $ 60.4 $ 57.2 $ 57.0 $ 88.4 $ 66.3 $ 79.6 $ 174.6 $ 234.3
Basic weighted average shares outstanding (in shares) 39.5     39.7     39.5 39.8
Common stock equivalents (in shares) 0.2     0.1     0.2 0.1
Diluted weighted average shares outstanding (in shares) 39.7     39.8     39.7 39.9
Basic earnings per share (in dollars per share) $ 1.53     $ 2.23     $ 4.42 $ 5.89
Diluted earnings per share (in dollars per share) $ 1.52     $ 2.22     $ 4.40 $ 5.87