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Derivatives Derivative Assets and Liabilities (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Derivative [Line Items]    
Derivative asset $ 8.2 $ 1.7
Derivative liability 2.5 1.2
Commodity Contract [Member]    
Derivative [Line Items]    
Derivative asset 8.2 1.7
Derivative liability 2.2 1.2
Foreign Exchange Contract [Member]    
Derivative [Line Items]    
Derivative asset 0.0 0.0
Derivative liability $ 0.3 $ 0.0