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Description of Business Asset Sales (Details) - USD ($)
$ in Millions
3 Months Ended
Oct. 22, 2014
Jun. 30, 2015
Apr. 16, 2015
Sep. 17, 2014
Photovoltaics Business | Photovoltaics        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Asset purchase agreement, selling price       $ 150.0
Working capital adjustment, payment   $ 0.1    
Digital Products Business        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Asset purchase agreement, selling price $ 17.5      
Asset sale, cash consideration 1.5      
Asset sale, promissory note, principal amount $ 16.0   $ 15.5  
Asset sale, promissory note, accrued interest     $ 0.2