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Accounting Standards and Significant Accounting Policies (Details) - USD ($)
3 Months Ended
Apr. 21, 2021
Mar. 09, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle            
Recurring revenue percentage of total revenue (percent)     75.00%      
Cash and investments     $ 1,400,000,000      
Revolving line of credit     0   $ 0  
Increase in net borrowings on revolving line of credit     0 $ 0    
Cash purchase of NIC     12,049,000 $ 261,000    
Accounts receivable, net     354,600,000   403,700,000  
Allowance for losses     8,200,000      
NIC | Subsequent Event            
New Accounting Pronouncements or Change in Accounting Principle            
Cash purchase of NIC $ 2,300,000,000          
Case Management, Business Process Management, Data and Insight            
New Accounting Pronouncements or Change in Accounting Principle            
Goodwill assessed for impairment     $ 158,600,000      
Percentage of total goodwill (percent)     19.00%      
Data and Insight            
New Accounting Pronouncements or Change in Accounting Principle            
Goodwill assessed for impairment     $ 75,700,000      
Unbilled Revenues            
New Accounting Pronouncements or Change in Accounting Principle            
Accounts receivable, net     145,700,000   140,800,000  
Unbilled Revenues | Retention Receivable            
New Accounting Pronouncements or Change in Accounting Principle            
Accounts receivable, net     10,400,000   $ 13,100,000  
Convertible Senior Notes Due 2026 | Senior Notes            
New Accounting Pronouncements or Change in Accounting Principle            
Debt instrument, interest rate, stated percentage   0.25%        
Convertible senior notes   $ 600,000,000 600,000,000      
Net proceeds from issuance   $ 591,400,000 594,000,000      
Revolving Credit Facility | 2019 Credit Agreement            
New Accounting Pronouncements or Change in Accounting Principle            
Revolving line of credit     $ 0      
Revolving credit facility, maximum borrowing capacity           $ 400,000,000
Revolving Credit Facility | New Credit Agreement | Subsequent Event            
New Accounting Pronouncements or Change in Accounting Principle            
Revolving credit facility, maximum borrowing capacity 1,400,000,000          
Revolving Credit Facility | Senior Revolving Credit Facility | Subsequent Event            
New Accounting Pronouncements or Change in Accounting Principle            
Revolving credit facility, maximum borrowing capacity 500,000,000          
Increase in net borrowings on revolving line of credit 250,000,000          
Revolving Credit Facility | Term Loan | Subsequent Event            
New Accounting Pronouncements or Change in Accounting Principle            
Increase in net borrowings on revolving line of credit $ 900,000,000