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New Accounting Pronouncements (Details) - USD ($)
$ in Millions
Feb. 28, 2021
Nov. 30, 2020
Sep. 01, 2020
Aug. 31, 2020
Feb. 29, 2020
Nov. 30, 2019
Aug. 31, 2019
New Accounting Pronouncement, Early Adoption [Line Items]              
Cumulative-effect adjustment $ (1,932.5) $ (1,937.0)   $ (2,127.5) $ (2,045.1) $ (1,987.3) $ (1,918.9)
Retained Earnings              
New Accounting Pronouncement, Early Adoption [Line Items]              
Cumulative-effect adjustment $ (2,635.9) $ (2,577.7)   (2,523.3) $ (2,399.6) $ (2,347.6) $ (2,295.8)
Cumulative effect of adoption of ASC 326              
New Accounting Pronouncement, Early Adoption [Line Items]              
Cumulative-effect adjustment       0.2      
Cumulative effect of adoption of ASC 326 | Retained Earnings              
New Accounting Pronouncement, Early Adoption [Line Items]              
Cumulative-effect adjustment     $ 0.2 $ 0.2