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Accounts Receivable (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Accounts Receivable [Line Items]    
Less allowance for doubtful accounts and sales discounts $ (0.4) $ (0.3)
Total accounts receivable 119.4 93.9
Trade receivables [Member]    
Accounts Receivable [Line Items]    
Accounts receivable, gross 97.7 69.8
Business tax credits, including VAT [Member]    
Accounts Receivable [Line Items]    
Accounts receivable, gross 3.7 4.2
Hedge contracts receivable [Member]    
Accounts Receivable [Line Items]    
Accounts receivable, gross 0.8 0.4
Other receivables [Member]    
Accounts Receivable [Line Items]    
Accounts receivable, gross $ 17.6 $ 19.8