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Liabilities - Other Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Other Assets    
Other liabilities    
Deferred compensation plan assets $ 3.5 $ 3.2
Other Liabilities    
Other liabilities    
Deferred compensation plan liabilities 3.0 3.5
Asset retirement obligations 3.2 3.2
Medical and dental benefits 2.0 2.2
Income taxes payable $ 1.0 $ 1.0