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Real Estate Investments Business Acquisitions (Parenthetical) (Details) | Sep. 30, 2019 a
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Pablo Plaza [Member] |
Business Acquisition [Line Items] |
Purchase of land for redevelopment | 0.17

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- Definition Area of a real estate property. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=reg_PabloPlazaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |