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Accounts and Other Receivables - Accounts and Other Receivables (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]    
Allowance for doubtful accounts $ (0.7) $ (1.1)
Total 241.1 218.3
Trade receivables    
Accounts Notes And Loans Receivable [Line Items]    
Accounts and other receivables 224.8 194.8
Recoverable VAT and other receivables    
Accounts Notes And Loans Receivable [Line Items]    
Accounts and other receivables 16.7 17.8
Refundable income taxes    
Accounts Notes And Loans Receivable [Line Items]    
Refundable income taxes $ 0.3 $ 6.8