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v3.21.1

Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($)
Accounting Policies [Abstract] |
Lease rent deferred | $ 3.3
Lease rent deferrals continued to recognize rental income | 2.4
Lease rent waived | $ 1.8

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- Definition Lease rent deferrals continued to recognize rental income. + References No definition available. + Details
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Namespace Prefix: | cdr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lease rent deferred. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lease rent waived. + References No definition available. + Details
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Namespace Prefix: | cdr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration