Summary of Significant Accounting Policies (Schedule of Useful Lives of Finite Lived Intangible Assets) (Details)	12 Months Ended
	Dec. 31, 2020
Acquired methodologies and technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life (in years)	2 years
Acquired methodologies and technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life (in years)	7 years
Acquired software
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life (in years)	3 years
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life (in years)	3 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life (in years)	7 years
Intellectual property | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life (in years)	2 years
Intellectual property | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life (in years)	13 years
Panel | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life (in years)	1 year
Panel | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life (in years)	7 years
Trade Names | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life (in years)	2 years
Trade Names | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life (in years)	6 years
Other | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life (in years)	6 years
Other | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life (in years)	8 years