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Organization and Principles of Consolidation Reclassifications (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2016 USD ($)
Reclassifications [Abstract] |
Prior Period Reclassification Adjustment | $ 47.3

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- Definition Reclassifications [Abstract] + References No definition available. + Details
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Namespace Prefix: | reg_
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Period Type: | duration

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- Definition The amount of a reclassification adjustment made to prior period financial statement amounts. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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