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v3.20.2

Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions | 3 Months Ended
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Jun. 30, 2020 USD ($)
Accounting Policies [Abstract] |
Lease rent deferred | $ 2.0
Lease rent deferrals continued to recognize rental income | 1.8
Lease rent waived | $ 0.4

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

X
- Definition Lease rent deferred. + References No definition available. + Details
Name: | cdr_LeaseRentDeferred
Namespace Prefix: | cdr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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