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Accounting Standards and Significant Accounting Policies (Details) - USD ($)			6 Months Ended
	Apr. 21, 2021	Mar. 09, 2021	Jun. 30, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle
Recurring revenue percentage of total revenue (percent)			77.00%
Cash and investments			$ 347,100,000
Accounts receivable, net			599,900,000	$ 403,700,000
Allowance for losses			8,100,000	9,300,000
Data and Insight
New Accounting Pronouncements or Change in Accounting Principle
Goodwill assessed for impairment			75,700,000
Platform Technologies
New Accounting Pronouncements or Change in Accounting Principle
Goodwill assessed for impairment			78,400,000
Unbilled Revenues
New Accounting Pronouncements or Change in Accounting Principle
Accounts receivable, net			156,000,000.0	140,800,000
Unbilled Revenues | Retention Receivable
New Accounting Pronouncements or Change in Accounting Principle
Accounts receivable, net			11,000,000.0	$ 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%
Debt instrument face amount		$ 600,000,000	600,000,000
Net proceeds from issuance		$ 591,400,000	594,000,000
Revolving Credit Facility | 2021 Credit Agreement
New Accounting Pronouncements or Change in Accounting Principle
Net proceeds from issuance	$ 1,100,000,000
Long term debt, gross			965,000,000
Revolving Credit Facility | Senior Unsecured Revolving Credit Facility
New Accounting Pronouncements or Change in Accounting Principle
Long term debt, gross			65,000,000
Line of credit facility, unused borrowing capacity			$ 435,000,000

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