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Revenue Recognition - Summary of Effect of Adoption of ASC 606 Impact on Condensed Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Oct. 01, 2018
Sep. 30, 2018
Disaggregation Of Revenue [Line Items]      
Inventories $ 2,096.9   $ 1,829.6
Other current assets 562.4   248.5
Other current liabilities 541.6   476.5
Retained earnings 1,671.2   $ 1,573.3
ASC 606 [Member] | Balances Without Adoption of ASC 606 [Member]      
Disaggregation Of Revenue [Line Items]      
Inventories 2,237.9    
Other current assets 368.4    
Other current liabilities 541.3    
Retained earnings 1,626.6    
ASC 606 [Member] | Impact of Adoption Increase/(Decrease) [Member]      
Disaggregation Of Revenue [Line Items]      
Inventories (141.0)    
Other current assets 194.0    
Other current liabilities 0.3    
Retained earnings $ 44.6 $ 43.5