Litigation, Other Commitments and Contingencies, and Disclosures about Guarantees - Risk and Uncertainties (Details) - Cleco Power - USD ($) $ in Millions	1 Months Ended
	Oct. 31, 2020	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Litigation [Line Items]
Increase in ARO liabilities	$ 0.3	$ 3.3
Oxbow
Litigation [Line Items]
Costs to be billed			$ 0.3	$ 0.2
Dolet Hills Power Station
Litigation [Line Items]
Increase in ARO liabilities		$ 3.3
Investment balance			99.0
Dolet Hills Power Station | DHLC
Litigation [Line Items]
Costs to be billed			154.2
Oxbow | Oxbow
Litigation [Line Items]
Costs to be billed			$ 7.7