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Other Current Liabilities
 9 Months Ended
Sep. 30, 2020
Payables and Accruals [Abstract]  
Other Current Liabilities Other Current Liabilities
Other current liabilities consisted of the following:
September 30, 2020December 31, 2019
Current portion of environmental remediation obligation$0.4 $0.6 
Current portion of lease liabilities0.1 0.1 
Accrued interest payable - related parties0.9 4.2 
Accrued liabilities3.8 1.7 
Other current liabilities$5.2 $6.6