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Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2021
Revision of Prior Period, Error Correction, Adjustment | Error Correction, Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues recognized related to performance obligations from previous period | $ 10.7 | $ 8.2

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- Definition Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12A -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL108322424-203045 + Details
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