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DELL APPRAISAL RIGHTS MATTER. (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 30, 2016
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2017
Dell appraisal rights matter [Member]            
Unusual or Infrequent Item, or Both [Line Items]            
Nonrecurring charge related to Dell appraisal rights matter       $ 166.2 $ 166.2  
Court determined fair value per share at time of Dell merger (in dollars per share)       $ 17.62    
Price offered per share in Dell merger (in dollars per share)       13.75    
Payment per share for any shareholder perfecting appraisal rights (in dollars per share)       $ 17.62    
Insurance proceeds $ 100.0 $ 50.0 $ 100.0      
Dell appraisal rights matter [Member]            
Unusual or Infrequent Item, or Both [Line Items]            
Unrecorded gain contingency           $ 15.2