Summary of Significant Accounting Policies, Risk Management (Details) $ in Millions	Jun. 30, 2017 USD ($) contract MMBTU	Dec. 31, 2016 USD ($) MMBTU	Jun. 30, 2016 contract	Apr. 12, 2016 contract
Other Current Assets [Member] | Cleco Power
Derivative Instruments and Hedging Activities Disclosures [Line Items]
FTRs in Energy risk management asset | $	$ 18.2	$ 7.9
Other Current Liabilities [Member] | Cleco Power
Derivative Instruments and Hedging Activities Disclosures [Line Items]
FTRs in Energy risk management liability | $	$ 0.3	$ 0.2
Open Natural Gas Positions | Cleco Power
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of instruments held to mitigate risk | MMBTU	0	0
Interest Rate Contract [Member] | Cleco Power
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of instruments held to mitigate risk	0		0
Successor | Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of instruments held to mitigate risk	0		0
Predecessor | Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of instruments held to mitigate risk				0