Plan of Acquisition (Details)	Feb. 06, 2018 USD ($) MW
Cleco Holdings | Acquisition Loan Facility, NRG South Central Acquisition
Business Acquisition [Line Items]
Debt amount | $	$ 300,000,000.0
Cleco Holdings | Term Loan Facility, NRG South Central Acquisition
Business Acquisition [Line Items]
Debt amount | $	300,000,000.0
Cleco Holdings | Incremental Revolving Facility, NRG Acquisition
Business Acquisition [Line Items]
Debt amount | $	$ 75,000,000.0
New Roads, Louisiana | Coal-fired Generating Station
Business Acquisition [Line Items]
Number of megawatts in station or facility	588
Jennings, Louisiana | Natural-gas-fired Peaking Facility
Business Acquisition [Line Items]
Number of megawatts in station or facility	300
NRG South Central
Business Acquisition [Line Items]
Business acquisition, transaction price agreed upon | $	$ 1,000,000,000
NRG South Central | Sterlington, Louisiana | Natural-gas-fired Generating Station
Business Acquisition [Line Items]
Number of megawatts in station or facility	176
NRG South Central | Jarreau, Louisiana | Natural-gas-fired Facility
Business Acquisition [Line Items]
Number of megawatts in station or facility	220
NRG South Central | Jarreau, Louisiana | Natural-gas-fired Peaking Facility
Business Acquisition [Line Items]
Number of megawatts in station or facility	210
NRG South Central | New Roads, Louisiana | Natural-gas-fired Generating Station
Business Acquisition [Line Items]
Number of megawatts in station or facility	540
NRG South Central | New Roads, Louisiana | Coal-fired Generating Facility
Business Acquisition [Line Items]
Number of megawatts in station or facility	580
NRG South Central | New Roads, Louisiana | Coal-fired Generating Station
Business Acquisition [Line Items]
Percentage of voting interests acquired	58.00%
NRG South Central | Jennings, Louisiana
Business Acquisition [Line Items]
Number of megawatts in station or facility	225
NRG South Central | Deweyville, Texas | Natural-gas-fired Generating Station
Business Acquisition [Line Items]
Number of megawatts in station or facility	1,263