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FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Investments) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Fair Value Disclosures [Abstract]      
Gain (Loss) on Investments $ 0.2 $ 1.7 $ 0.2