Summary of Significant Accounting Policies, Risk Management (Details) $ in Millions	Mar. 31, 2017 USD ($) contract MMBTU	Dec. 31, 2016 USD ($) MMBTU	Mar. 31, 2016 contract
Other Current Assets [Member] | Cleco Power [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
FTRs in Energy risk management asset | $	$ 5.0	$ 7.9
Other Current Liabilities [Member] | Cleco Power [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
FTRs in Energy risk management liability | $	$ 0.5	$ 0.2
Open Natural Gas Positions [Member] | Cleco Power [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of instruments held to mitigate risk | MMBTU	0	0
Interest Rate Contract [Member] | Cleco Power [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of instruments held to mitigate risk	0		0
Successor [Member] | Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of instruments held to mitigate risk	0
Predecessor [Member] | Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of instruments held to mitigate risk			0