Summary of Significant Accounting Policies, Risk Management (Details) $ in Millions	Sep. 30, 2016 USD ($) MMBTU	Dec. 31, 2015 USD ($) MMBTU
Energy Related Derivative [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of open natural gas positions | MMBTU	0	0
Cleco Power [Member] | Energy Related Derivative [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of open natural gas positions | MMBTU	0	0
Energy risk management asset | Cleco Power [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
FTRs in Energy risk management asset | $	$ 10.0	$ 7.7
Energy risk management liabilities | Cleco Power [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
FTRs in Energy risk management liability | $	$ 0.4	$ 0.3