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Contract Assets and Liabilities (Narrative) (Details) - USD ($)
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]    
Contract with customer, asset, period decrease $ 23,400,000  
Contract with customer, asset, impairment loss 0 $ 0
Decrease in contract with customer, liability 2,000,000  
Contract with customer, liability, revenue recognized $ 5,300,000 $ 3,500,000