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Derivatives (Derivative Instruments Classified as Level 2) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Designated as Hedging Instrument [Member] | Cash Flow Hedge [Member] | Cost of Goods Sold [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of loss reclassified from AOCL into income (effective portion) $ (0.3) $ (3.5) $ (7.3) $ (9.4)
Designated as Hedging Instrument [Member] | Cash Flow Hedge [Member] | Other Expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of loss recognized in net income (ineffective portion) 0.0 (0.1) 0.0 1.1
Not Designated as Hedging Instrument [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of loss (gain) recognized in net income 0.3 (0.6) 0.6 (5.6)
Not Designated as Hedging Instrument [Member] | Other Expense [Member] | Commodity Futures Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of loss (gain) recognized in net income 0.3 (0.2) 0.9 (1.3)
Not Designated as Hedging Instrument [Member] | Other Expense [Member] | Foreign Currency Forward Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of loss (gain) recognized in net income $ 0.0 $ (0.4) $ (0.3) $ (4.3)