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Revenue from Contracts with Customers (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Business Acquisition [Line Items]    
Performance obligation satisfied in previous period $ 0 $ 0
Change in estimate of transaction price 0 0
Change in total estimated cost 0 0
Loss on contracts 0 $ 0
Change in net contract liabilities 36,000,000.0  
Contract asset impairment 0  
Remaining performance obligations 4,156,591,000  
2019Acquisitions [Member]    
Business Acquisition [Line Items]    
Increase (decrease) in contract assets from acquisitions 700,000  
Increase (decrease) in contract liabilities from acquisitions $ 7,300,000