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Fair Value Accounting, Interest Rate Derivatives (Details) (Cleco Power [Member], Swap [Member], USD $)
In Millions, unless otherwise specified
0 Months Ended 1 Months Ended
Nov. 14, 2011
May 30, 2013
Jun. 30, 2013
May 07, 2013
Mar. 30, 2013
Cleco Power [Member] | Swap [Member]
         
Forward Starting Interest Rate Swap [Abstract]          
Notional amount of forward starting interest rate derivative $ 50.0        
Forward starting interest rate spot period 30 years        
Foward starting interest rate 3.05%        
Gain (Loss) on the settlement of Forward Starting Interest Rate Derivative       (3.3)  
Gain (loss) on forward starting interest rate swap remaining in accumulated other comprehensive income (loss)         (0.4)
Deferred Gain (Loss) as a Regulatory Asset on settlement of Forward Starting Interest Rate Derivative     $ (2.9)    
Amortization Period of Gain (Loss) on settlement of the Forward Starting Interest Rate Derivative   25 years