Nature of Operations and Basis of Presentation - Narrative Remaining Performance Obligations (Details) $ in Billions	Sep. 30, 2021 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized as of period end	$ 2.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01 | One Year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Period of recognition for remaining performance obligation	12 months
Remaining performance obligation (as a percent)	50.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01 | Two Years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Period of recognition for remaining performance obligation	24 months
Remaining performance obligation (as a percent)	75.00%