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Revenue Recognition - Remaining Performance Obligations - (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-12-31
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Revenue Recognition  
Transaction price allocated to unsatisfied performance obligations $ 12.1
Period to satisfy the remaining performance obligations and recognize the transaction price 24 months
Right to invoice and wholly unsatisfied performance obligation practical expedients true