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FAIR VALUE MEASUREMENTS (Tables)
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets Measured on Recurring Basis As of June 30, 2021 and December 31, 2020, the assets measured at fair value on a recurring basis were as set forth in the table below:
 
 
 
(In millions)
June 30, 2021Quoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs (Level 3)
Cash equivalents$5.9 $5.9 $— $— 
December 31, 2020Quoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Cash equivalents$20.2 $20.2 $— $—