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Fair Value Accounting - Net Changes in Net Fair Value of FTR Assets and Liabilities Classified as Level 3 (Details) - Commodity-related contracts - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance $ 3,180 $ 5,778
Unrealized gains (losses) 16,123 (1,398)
Purchases 849 466
Settlements (19,129) (3,750)
Ending balance 1,023 1,096
CLECO POWER    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance 3,216 5,725
Unrealized gains (losses) (37) (1,311)
Purchases 849 466
Settlements (2,940) (3,731)
Ending balance $ 1,088 $ 1,149