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Accrued Expenses and Other Liabilities - Other liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Other liabilities    
Accrued social security taxes $ 3.6  
Other Assets    
Other liabilities    
Deferred compensation plan assets 2.4 $ 2.7
Accrued expenses and other current liabilities    
Other liabilities    
Accrued social security taxes 1.8  
Other Liabilities    
Other liabilities    
Deferred compensation plan liabilities 2.5 3.1
Asset retirement obligations 2.7 3.2
Income taxes payable 1.4 1.0
Medical and dental benefits 1.9 $ 2.0
Accrued social security taxes $ 1.8