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Derivatives Assets and Liabilities (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Derivative [Line Items]    
Derivative asset $ 21.8 $ 8.2
Derivative liability 5.3 2.5
Commodity Contract [Member]    
Derivative [Line Items]    
Derivative asset 21.8 8.2
Derivative liability 4.4 2.2
Foreign Exchange Contract [Member]    
Derivative [Line Items]    
Derivative asset 0.0 0.0
Derivative liability $ 0.9 $ 0.3