Receivables Trade and Other Accounts Receivable (Policies)	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Accounts Receivable [Policy Text Block]	Client receivables represent recorded revenues that have either been billed, or for which we have an unconditional right to invoice and receive payment in the future. We periodically provide long-term financing options to creditworthy clients through extended payment terms. Generally, these extended payment terms provide for date-based payments over a fixed period, not to exceed the term of the overall arrangement. Thus, our portfolio of client contracts contains a financing component, which is recognized over time as a component of "Other income, net" in our consolidated statements of operations. We perform ongoing credit evaluations of our clients and generally do not require collateral from our clients.