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Basis of Presentation - Schedule of Revision of Balance Sheet (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Receivables, less allowance for doubtful accounts $ 1,382.9 $ 1,331.3
Inventories 457.1 386.8
Accounts payable $ 996.5 985.3
As Reported    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Receivables, less allowance for doubtful accounts   1,354.4
Inventories   379.6
Accounts payable   1,001.2
Adjustments    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Receivables, less allowance for doubtful accounts   (23.1)
Inventories   7.2
Accounts payable   $ (15.9)