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v3.21.2

Organization and Significant Accounting Policies - Revenues and Tenant and Other Receivables (Parentheticals) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021
Other transaction fees [Member] |  |
Schedule Of Lease Income And Tenant Receivables [Line Items] |  |
Business acquisition consideration transferred, Net | $ 13.6 | $ 13.6

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- Definition Business acquisition consideration transferred, net. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Schedule of lease income and tenant receivables. + References No definition available. + Details
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Namespace Prefix: | reg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=reg_OthertransactionfeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |