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Commitments and Contingencies (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]    
Guarantor Obligations, Current Carrying Value $ 59.2  
Sales and Use Tax [Member]    
Loss Contingencies [Line Items]    
Loss Contingency Accrual $ 1.2 $ 0.6