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Receivables (Parenthetical) (Details) $ in Millions | Dec. 31, 2021 USD ($)
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Receivables [Abstract] |
Net receivables related to deferred rent | $ 0.3

X
- Definition Net receivables related to deferred rent. + References No definition available. + Details
Name: | cdr_NetReceivablesRelatedToDeferredRent
Namespace Prefix: | cdr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration