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Receivables, Net - Receivables, Net (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Insurance Settlements Receivable $ 19.0      
Trade accounts receivable (See Note 2) 531.7 $ 601.4    
Notes receivable 3.7 3.9    
Other(a) 22.9 [1] 40.4    
Receivables, gross 558.3 645.7    
Less: allowance for doubtful accounts 18.3 16.1 $ 15.4 $ 16.1
Receivables, net $ 540.0 $ 629.6    
[1] (a)Other, as of December 31, 2017, includes an insurance-related settlement receivable of $19.