Summary of Significant Accounting Policies - Changes in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Jan. 01, 2020
ACCOUNTS RECEIVABLE
Balances, Dec. 31, 2019	$ 3,005
Current period provision	2,498
Charge-offs	(4,092)
Recovery	641
Balances, Mar. 31, 2020	2,123
OTHERS
Balances, Dec. 31, 2019	1,250
Current period provision	388
Charge-offs	0
Recovery	0
Balances, Mar. 31, 2020	1,638
TOTAL
Balances, Dec. 31, 2019	4,255
Current period provision	2,886
Charge-offs	(4,092)
Recovery	641
Balances, Mar. 31, 2020	3,761
Accounting Standards Update 2016-13
ACCOUNTS RECEIVABLE
CECL adoption		$ 71
TOTAL
CECL adoption		71
CLECO POWER
ACCOUNTS RECEIVABLE
Balances, Dec. 31, 2019	3,005
Current period provision	2,498
Charge-offs	(4,092)
Recovery	641
Balances, Mar. 31, 2020	$ 2,123
CLECO POWER | Accounting Standards Update 2016-13
ACCOUNTS RECEIVABLE
CECL adoption		71
TOTAL
CECL adoption		$ 71