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Receivables, Net - Receivables, Net (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Insurance Settlements Receivable $ 19.0      
Trade accounts receivable 601.4 $ 513.5    
Notes receivable 3.9 4.2    
Other 40.4 [1] 21.6    
Receivables, gross 645.7 539.3    
Less: allowance for doubtful accounts 16.1 15.4 $ 16.1 $ 13.3
Receivables, net $ 629.6 $ 523.9    
[1] (a)Other includes an insurance-related settlement receivable of $19.0 recorded in 2017.