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Supplemental Balance Sheet Information (Tables)
12 Months Ended
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Other Current Liabilities

Other current liabilities (included as a separate line item in our Consolidated Balance Sheets) include the following:

 

    December 31,  
    2020     2019  
    (In millions)  
Accrued payroll   $ 0.5     $ 0.1  
Other current liabilities     1.3       1.4  
Total other current liabilities   $ 1.8     $ 1.5