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Accumulated Other Comprehensive Income (Loss) - Components (Details) - USD ($)
$ in Millions
3 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Restructuring Reserve, Translation and Other Adjustment $ 17.9      
Accumulated Other Comprehensive Income (Loss), Net of Tax (138.8) $ (122.4) $ (125.3) $ (138.5)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (19.0) (32.6) (23.1) (29.6)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (119.8) $ (89.8) $ (102.2) $ (108.9)