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Revenue Recognition Service or Extended Maintenance Agreements (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Unearned revenue associated with outstanding contracts $ 4.6 $ 4.6 $ 5.0
Revenue recognized $ 1.3 $ 2.9