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Revenue - Concentration of Major Clients (Details) - Sales Revenue, Net - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Concentration Risk [Line Items]
Concentration risk (as a percent)	35.00%	41.00%	48.00%
Client 1
Concentration Risk [Line Items]
Concentration risk (as a percent)	18.00%	16.00%	24.00%
Client 2
Concentration Risk [Line Items]
Concentration risk (as a percent)	17.00%	15.00%	14.00%
Client 3
Concentration Risk [Line Items]
Concentration risk (as a percent)		10.00%	10.00%

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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