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Revenue from Contracts with Customers (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Business Acquisition [Line Items]          
Performance obligation satisfied in previous period $ 4,400,000 $ 0 $ 6,100,000 $ 0  
Change in estimate of transaction price 0 0 0 0  
Change in total estimated cost 0 0 0 0  
Loss on contracts 0 $ 0 0 $ 0  
Change in net contract liabilities     81,600,000    
Contract asset impairment     0   $ 0
Remaining performance obligations $ 4,530,151,000   4,530,151,000    
2020 Acquisitions          
Business Acquisition [Line Items]          
Increase (decrease) in contract assets from acquisitions     1,000,000.0    
Increase (decrease) in contract liabilities from acquisitions     $ 10,900,000