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Accrued Expenses and Other Liabilities - Other Liabilities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Other Assets    
Other liabilities    
Plan assets $ 3.4  
Other liabilities    
Other liabilities    
Plan liabilities 4.7  
Asset retirement obligations 3.3  
Medical and dental benefits 2.2  
Acquisition related accruals $ 0.4  
Income taxes payable   $ 4.9