Other Intangible Assets, net and Goodwill - Remaining Weighted-Average Amortization Period (Details)	12 Months Ended
	Dec. 31, 2020
Schedule Of Goodwill and Intangible Assets Disclosure [Line Items]
Remaining Range of Years	19 years 8 months 23 days
Customer relationships
Schedule Of Goodwill and Intangible Assets Disclosure [Line Items]
Remaining Range of Years	22 years 2 months 19 days
Database and content
Schedule Of Goodwill and Intangible Assets Disclosure [Line Items]
Remaining Range of Years	13 years 8 months 4 days
Computer software
Schedule Of Goodwill and Intangible Assets Disclosure [Line Items]
Remaining Range of Years	9 years 7 months 13 days
Trade names
Schedule Of Goodwill and Intangible Assets Disclosure [Line Items]
Remaining Range of Years	5 years 4 months 20 days
Backlog
Schedule Of Goodwill and Intangible Assets Disclosure [Line Items]
Remaining Range of Years	4 years 14 days