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Revenue Recognition (Remaining Performance Obligations) (Details)
Sep. 30, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Aggregate amount of the transaction price allocated to remaining performance obligations (percentage) 74.00%
Expected timing of satisfaction for remaining performance obligations, period 15 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Aggregate amount of the transaction price allocated to remaining performance obligations (percentage) 26.00%
Expected timing of satisfaction for remaining performance obligations, period