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Summary of Significant Accounting Policies - Restricted Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Feb. 04, 2019
Dec. 31, 2018
Restricted Cash and Cash Equivalents [Abstract]      
Current $ 11,100   $ 11,241
Non-current 15,203   18,670
Total restricted cash and cash equivalents 26,303   29,911
Cleco Katrina/Rita’s storm recovery bonds      
Restricted Cash and Cash Equivalents [Abstract]      
Current 9,632   9,505
Cleco Power’s charitable contributions      
Restricted Cash and Cash Equivalents [Abstract]      
Current 1,200   1,200
Non-current 2,094   2,753
Cleco Power’s rate credit escrow      
Restricted Cash and Cash Equivalents [Abstract]      
Current 268   536
Non-current 0   505
Diversified Lands’ mitigation escrow      
Restricted Cash and Cash Equivalents [Abstract]      
Non-current 21   21
Cleco Cajun’s defense fund      
Restricted Cash and Cash Equivalents [Abstract]      
Non-current 719   0
Cleco Cajun’s margin deposits      
Restricted Cash and Cash Equivalents [Abstract]      
Non-current 100   0
Cleco Power’s future storm restoration costs      
Restricted Cash and Cash Equivalents [Abstract]      
Non-current 12,269   15,391
Katrina Rita Bond Principal Payments      
Restricted Cash and Cash Equivalents [Abstract]      
Collections 20,600    
Katrina Rita Bond Interest Payments      
Restricted Cash and Cash Equivalents [Abstract]      
Payments 1,500    
Katrina/Rita Storm Recovery Collections, Net of Administration Fees      
Restricted Cash and Cash Equivalents [Abstract]      
Administration fees received 22,200    
CLECO POWER      
Restricted Cash and Cash Equivalents [Abstract]      
Current 11,100   11,241
Non-current 14,363   18,649
Total restricted cash and cash equivalents 25,463   29,890
CLECO POWER | Cleco Katrina/Rita’s storm recovery bonds      
Restricted Cash and Cash Equivalents [Abstract]      
Current 9,632   9,505
CLECO POWER | Cleco Power’s charitable contributions      
Restricted Cash and Cash Equivalents [Abstract]      
Current 1,200   1,200
Non-current 2,094   2,753
CLECO POWER | Cleco Power’s rate credit escrow      
Restricted Cash and Cash Equivalents [Abstract]      
Current 268   536
Non-current 0   505
CLECO POWER | Cleco Power’s future storm restoration costs      
Restricted Cash and Cash Equivalents [Abstract]      
Non-current $ 12,269   $ 15,391
NRG South Central      
Restricted Cash and Cash Equivalents [Abstract]      
Restricted cash and cash equivalents   $ 707