Revenue, Remaining Performance Obligations (Details) $ in Millions	Mar. 31, 2019 USD ($)
Remaining performance obligations [Abstract]
Remaining performance obligations	$ 5.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Remaining performance obligations [Abstract]
Remaining performance obligations	$ 4.3
Expected timing of satisfaction, period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Remaining performance obligations [Abstract]
Remaining performance obligations	$ 0.7
Expected timing of satisfaction, period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Remaining performance obligations [Abstract]
Remaining performance obligations
Expected timing of satisfaction, period	12 months