Receivables (Summary Of Net Receivables) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Receivables [Abstract]
Client receivables	$ 1,307,167	$ 1,322,278
Less: Provision for expected credit losses	145,806	153,566
Total receivables, net	$ 1,161,361	$ 1,168,712

The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant