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Liabilities - Other Liabilities (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Other Liabilities    
Deferred compensation $ 4.5  
Asset retirement obligations 3.3  
Medical and dental benefits 2.5  
Acquisition related accruals $ 0.7  
Income taxes payable   $ 4.9