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Business Acquisition Business Acquisition Pro Forma (Details) - DelStar [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Business Acquisition [Line Items]        
Business Acquisition, Pro Forma Revenue $ 211.0   $ 423.0  
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax   $ 25.7   $ 49.6