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Financial Instruments (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Offsetting Assets [Line Items]          
Document Period End Date     Sep. 30, 2018    
Margin Deposit Assets $ 4.8   $ 4.8   $ 1.9
Derivative Asset, Fair Value, Amount Offset Against Collateral 1.7   1.7   0.5
Largest Customer [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member]          
Offsetting Assets [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 147.1   $ 492.5    
Largest Customer [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]          
Offsetting Assets [Line Items]          
Concentration Risk, Percentage     25.00%    
Largest Customer [Member] | Supplier Concentration Risk [Member] | Cost of Sales [Member]          
Offsetting Assets [Line Items]          
Purchases of Product 64.1   $ 158.1    
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]          
Offsetting Assets [Line Items]          
Derivative, Notional Amount 524.3   524.3   491.1
Derivative, Gain (Loss) on Derivative, Net (0.3) $ (0.6) 1.5 $ 0.6  
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]          
Offsetting Assets [Line Items]          
Derivative, Notional Amount 73.9   73.9   197.7
Derivative, Gain (Loss) on Derivative, Net 1.0   (5.5)    
Other Current Assets [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]          
Offsetting Assets [Line Items]          
Derivative Asset 0.2   0.2   1.2
Other Current Liabilities [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]          
Offsetting Assets [Line Items]          
Derivative Asset         $ 2.6
Derivative Liability $ 1.0   $ 1.0