Annual report pursuant to Section 13 and 15(d)

Revenue recognition - Remaining Performance Obligation (Details)

v3.20.2
Revenue recognition - Remaining Performance Obligation (Details)
$ in Millions
Sep. 30, 2020
USD ($)
Revenue from Contract with Customer [Abstract]  
Revenue, remaining performance obligation, amount $ 400
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation, percentage 50.00%
Revenue, remaining performance obligation, period 12 months