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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

X
- Definition The fair value per share of a company at the time of a merger that was determined by a court during the period. + References No definition available. + Details
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- Definition The amount per share that was determined to be paid to affected clients during the period which was intended to make them whole for the voting discrepancy that resulted in the denial of their appraisal rights. + References No definition available. + Details
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