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Affiliate Transactions (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Affiliate Transaction [Line Items]                      
Accounts payable - affiliate $ 33,780,000       $ 0       $ 33,780,000 $ 0  
Distributions to member         10,850,000 $ 20,600,000 $ 20,400,000 $ 19,500,000   71,350,000 $ 84,065,000
Affiliate revenue                 0 0 0
Contributions from member                 384,900,000    
Cleco Cajun | Pension plan                      
Affiliate Transaction [Line Items]                      
Charges from each affiliate                 239,000 0  
Cleco Holdings                      
Affiliate Transaction [Line Items]                      
Accounts payable - affiliate 33,800,000       3,200,000       33,800,000 3,200,000  
Cleco Holdings                      
Affiliate Transaction [Line Items]                      
Accounts payable - affiliate         0         0  
Cleco Holdings | Cleco Holdings                      
Affiliate Transaction [Line Items]                      
Distributions to member                 0 71,400,000  
CLECO POWER                      
Affiliate Transaction [Line Items]                      
Accounts receivable - affiliate 14,481,000       3,318,000       14,481,000 3,318,000  
Accounts payable - affiliate 14,123,000       7,843,000       14,123,000 7,843,000  
Distributions to member 20,000,000 $ 0 $ 0 $ 0 0 $ 50,400,000 $ 43,000,000 $ 28,000,000 20,000,000 121,400,000 135,000,000
Affiliate revenue                 3,125,000 874,000 851,000
Total                 10,745,000 1,966,000 1,345,000
CLECO POWER | Support Group                      
Affiliate Transaction [Line Items]                      
Accounts receivable - affiliate 3,172,000       2,619,000       3,172,000 2,619,000  
Accounts payable - affiliate 13,890,000       7,755,000       13,890,000 7,755,000  
Affiliate revenue                 3,088,000 874,000 851,000
CLECO POWER | Support Group | Pension plan                      
Affiliate Transaction [Line Items]                      
Charges from each affiliate                 1,316,000 1,963,000  
CLECO POWER | Support Group | Other operations and maintenance                      
Affiliate Transaction [Line Items]                      
Charges from each affiliate                 73,090,000 56,669,000 50,572,000
CLECO POWER | Support Group | Taxes other than income taxes                      
Affiliate Transaction [Line Items]                      
Charges from each affiliate                 (73,000) 6,000 (13,000)
CLECO POWER | Support Group | Other expense                      
Affiliate Transaction [Line Items]                      
Charges from each affiliate                 64,000 290,000 255,000
CLECO POWER | Cleco Cajun                      
Affiliate Transaction [Line Items]                      
Accounts receivable - affiliate 958,000       0       958,000 0  
Accounts payable - affiliate 39,000       0       39,000 0  
Other operations revenue                 7,471,000 0 0
Affiliate revenue                 37,000 0 0
CLECO POWER | Cleco Holdings                      
Affiliate Transaction [Line Items]                      
Accounts receivable - affiliate 10,351,000       699,000       10,351,000 699,000  
Accounts payable - affiliate $ 194,000       $ 88,000       194,000 88,000  
Distributions to member                 20,000,000 121,400,000 135,000,000
Other income                 149,000 1,092,000 494,000
Contributions from member                 0 0 0
CLECO POWER | Cleco Holdings | Other expense                      
Affiliate Transaction [Line Items]                      
Charges from each affiliate                 $ 0 $ 1,007,000 $ 361,000