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Revenues (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Revenue from Contract with Customer [Abstract]    
Performance obligations satisfied or partially satisfied in previous periods $ 4.5 $ 6.5
Unfulfilled performance obligations $ 3.8 $ 3.8
Performance obligation expected duration   18 months