Business Segment and Geographic Information (Narrative) (Details)	9 Months Ended	12 Months Ended
Sep. 30, 2021 Division Customers	Dec. 31, 2020 Customers
Concentration Risk [Line Items]
Number of business segments \| Division	2
Maximum Percentage Gross Trade Receivables From One Customer	10.00%	10.00%
NumberOfCustomersExceedReceivablesThreshold \| Customers	0	0
Geographic Concentration Risk [Member] \| Accounts Receivable [Member] \| UNITED STATES
Concentration Risk [Line Items]
Concentration Risk, Percentage	27.00%	32.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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