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DELL APPRAISAL RIGHTS MATTER. (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |
Operating expenses | $ 3,461.0 | $ 3,230.9 | $ 3,011.2 |  |
Dell appraisal rights matter |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |
Nonrecurring charge related to Dell appraisal rights matter |  |  |  |  | $ 166.2
Insurance proceeds |  |  |  | $ 150.0 |
Reversal of charge related to Dell appraisal rights matter |  |  | 15.2 |  |
Operating expenses |  |  | $ 1.0 |  |

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