Consolidated Statements of Changes in Member's Equity - USD ($) $ in Thousands	Total	MEMBERSHIP INTEREST	RETAINED EARNINGS	AOCI	CLECO POWER	CLECO POWER MEMBERSHIP INTEREST	CLECO POWER AOCI
Balance, beginning at Dec. 31, 2017	$ 2,096,357	$ 2,069,376	$ 29,902	$ (2,921)	$ 1,550,679	$ 1,564,362	$ (13,683)
Increase (Decrease) in Equity [Roll Forward]
Distributions to member	(71,350)		(71,350)		(121,400)	(121,400)
Net income	94,437		94,437		162,257	162,257
Other comprehensive income (loss), net of tax	5,296			5,296	2,997		2,997
Reclassification of effect of tax rate change	0		589	(589)	0	2,496	(2,496)
Balance, ending at Dec. 31, 2018	2,124,740	2,069,376	53,578	1,786	1,594,533	1,607,715	(13,182)
Increase (Decrease) in Equity [Roll Forward]
Distributions to member					(20,000)	(20,000)
Contributions from member	384,900	384,900	0
Net income	152,665		152,665		148,262	148,262
Other comprehensive income (loss), net of tax	(19,299)			(19,299)	(9,403)		(9,403)
Balance, ending at Dec. 31, 2019	2,643,006	2,454,276	206,243	(17,513)	1,713,392	1,735,977	(22,585)
Increase (Decrease) in Equity [Roll Forward]
Net income	122,300		122,300		96,655	96,655
Other comprehensive income (loss), net of tax	(8,283)			(8,283)	(2,168)		(2,168)
Balance, ending at Dec. 31, 2020	$ 2,757,023	$ 2,454,276	$ 328,543	$ (25,796)	$ 1,807,879	$ 1,832,632	$ (24,753)