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Derivative Financial Instruments (Details 2) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Fair values of derivatives on consolidated balance sheets    
Other current assets $ 13.5 $ 0.5
Other assets 9.6 0.0
Asset Derivative 23.1 0.5
Other current liabilities (22.6) (48.4)
Other liabilities (5.2) 0.0
Liability derivative (27.8) (48.4)
Foreign exchange contracts | Derivatives not designated as cash flow hedges    
Fair values of derivatives on consolidated balance sheets    
Other current assets 0.0 0.0
Other assets 0.0 0.0
Other current liabilities (19.6) (22.4)
Other liabilities 0.0 0.0
Natural gas derivatives | Derivatives not designated as cash flow hedges    
Fair values of derivatives on consolidated balance sheets    
Other current assets 13.5 0.5
Other assets 9.6 0.0
Other current liabilities (3.0) (26.0)
Other liabilities $ (5.2) $ 0.0