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Revenue Recognition - Summary of Effect of Adoption of ASC 606 Impact on Condensed Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Oct. 01, 2018
Sep. 30, 2018
Disaggregation Of Revenue [Line Items]      
Inventories $ 2,074.2   $ 1,829.6
Other current assets 515.7   248.5
Other current liabilities 676.8   476.5
Retained earnings 1,805.1   $ 1,573.3
ASC 606 [Member] | Balances Without Adoption of ASC 606 [Member]      
Disaggregation Of Revenue [Line Items]      
Inventories 2,214.3    
Other current assets 321.8    
Other current liabilities 676.2    
Retained earnings 1,759.9    
ASC 606 [Member] | Impact of Adoption Increase/(Decrease) [Member]      
Disaggregation Of Revenue [Line Items]      
Inventories (140.1)    
Other current assets 193.9    
Other current liabilities 0.6    
Retained earnings $ 45.2 $ 43.5