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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