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Liabilities - Performance Obligations Amount (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Liabilities  
Remaining performance obligations $ 49.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01  
Performance obligations  
Remaining performance obligations, expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01  
Performance obligations  
Remaining performance obligations, expected timing of satisfaction 2 years