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Business Combination (Details) - USD ($)
9 Months Ended
Apr. 13, 2016
Sep. 30, 2016
Apr. 07, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Accumulated Depreciation $ 0      
Deferred Tax Liabilities, Goodwill 0      
Preliminary Purchase Price Allocation [Abstract]        
Current assets 455,016,000      
Property, plant, and equipment, net 3,432,144,000      
Goodwill 1,491,519,000      
Other long-term assets 1,022,312,000      
Current liabilities 228,515,000      
Net deferred income tax liabilities 1,059,486,000      
Other deferred credits 279,379,000      
Long-term debt, net 1,470,126,000      
Total purchase price $ 3,363,485,000      
Cleco Holdings [Member]        
Business Acquisition [Line Items]        
Common stock, par value (in dollars per share) $ 1.00      
Share price at the time of the Merger (in dollars per share) $ 55.37      
Purchase Price Consideration $ 3,360,000,000      
Cleco Power [Member]        
Business Acquisition [Line Items]        
Accumulated Depreciation   $ 1,593,398,000   $ 1,525,298,000
Property, Plant and Equipment [Member]        
Preliminary Fair Value Adjustments [Abstract]        
Assets (1,334,932,000)      
Accumulated Depreciation [Member]        
Preliminary Fair Value Adjustments [Abstract]        
Assets 1,565,776,000      
Goodwill [Member]        
Preliminary Fair Value Adjustments [Abstract]        
Assets 1,491,519,000      
Intangible Assets [Member]        
Preliminary Fair Value Adjustments [Abstract]        
Assets 90,651,000      
Regulatory Asset [Member]        
Preliminary Fair Value Adjustments [Abstract]        
Assets 250,409,000      
Accumulated Deferred Federal and State Income Taxes [Member]        
Preliminary Fair Value Adjustments [Abstract]        
Liabilities 126,400,000      
Other Deferred Credits [Member]        
Preliminary Fair Value Adjustments [Abstract]        
Liabilities 21,175,000      
Long-term Debt [Member]        
Preliminary Fair Value Adjustments [Abstract]        
Liabilities 198,599,000      
Cash Paid to Cleco shareholders [Member] | Cleco Holdings [Member]        
Business Acquisition [Line Items]        
Purchase Price Consideration, Cash Paid 3,350,000,000      
Cash Paid for Cleco LTIP equity awards [Member] | Cleco Holdings [Member]        
Business Acquisition [Line Items]        
Purchase Price Consideration, Cash Paid $ 9,500,000      
Merger Commitments, rate credits [Member] | LPSC [Member]        
Business Acquisition [Line Items]        
Merger Commitments     $ 136,000,000  
Merger Commitments, rate credits [Member] | LPSC [Member] | Cleco Power [Member]        
Business Acquisition [Line Items]        
Merger Commitments     136,000,000  
Merger Commitments, economic development contribution [Member] | LPSC [Member]        
Business Acquisition [Line Items]        
Merger Commitments     7,000,000  
Merger Commitments, economic development contribution [Member] | LPSC [Member] | Cleco Power [Member]        
Business Acquisition [Line Items]        
Merger Commitments     7,000,000  
Merger Commitments, charitable contribution, disbursed over 5 years [Member] | LPSC [Member]        
Business Acquisition [Line Items]        
Merger Commitments     6,000,000  
Merger Commitments, charitable contribution, disbursed over 5 years [Member] | LPSC [Member] | Cleco Power [Member]        
Business Acquisition [Line Items]        
Merger Commitments     6,000,000  
Merger Commitments, economic development contribution, disbursed over 5 years [Member] | LPSC [Member]        
Business Acquisition [Line Items]        
Merger Commitments     2,500,000  
Merger Commitments, economic development contribution, disbursed over 5 years [Member] | LPSC [Member] | Cleco Power [Member]        
Business Acquisition [Line Items]        
Merger Commitments     2,500,000  
Merger Commitments, cost savings [Member] | LPSC [Member]        
Business Acquisition [Line Items]        
Merger Commitments     1,200,000  
Merger Commitments, cost savings [Member] | LPSC [Member] | Cleco Power [Member]        
Business Acquisition [Line Items]        
Merger Commitments     $ 1,200,000  
Non-vested Stock [Member]        
Business Acquisition [Line Items]        
Remaining LTIP equity awards 0      
Cleco Trade Name [Member]        
Preliminary Purchase Price Allocation [Abstract]        
Intangible Asset, Useful Life   20 years