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New Accounting Pronouncements - Impact of Adopting ASU 2017-07 (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cost of products sold $ 2,193.0 $ 2,194.7 $ 2,024.0
Selling, distribution, and administrative expenses 1,015.0 1,019.0 942.3
Miscellaneous expense, net $ (4.7) (1.4) (2.4)
ASU 2017-07      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cost of products sold   2,194.7 2,024.0
Selling, distribution, and administrative expenses   1,019.0 942.3
Miscellaneous expense, net   1.4 2.4
ASU 2017-07 | Previously Reported      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cost of products sold   2,193.3 2,023.9
Selling, distribution, and administrative expenses   1,026.6 951.1
Miscellaneous expense, net   (4.8) (6.3)
ASU 2017-07 | Higher (Lower)      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cost of products sold   1.4 0.1
Selling, distribution, and administrative expenses   (7.6) (8.8)
Miscellaneous expense, net   $ 6.2 $ 8.7