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Description of Business (Sale of Photovoltaics and Digital Products Business) (Details) - Discontinued Operations, Disposed of by Sale - USD ($)
$ in Millions
Sep. 30, 2015
Apr. 17, 2015
Apr. 16, 2015
Jan. 02, 2015
Photovoltaics Business | Photovoltaics        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Asset purchase agreement, selling price $ 149.9      
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, promissory note, principal amount, post-adjustment   $ 15.5 $ 15.5 $ 1.5
Asset sale, promissory note, principal amount, pre-adjustment       $ 16.0
Accrued interest on note receivable   $ 0.2