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Business Combination (Details) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended
Apr. 13, 2016
Dec. 31, 2016
Nov. 30, 2016
Dec. 31, 2016
Mar. 31, 2017
Apr. 07, 2016
Business Acquisition [Line Items]            
Accumulated depreciation $ 0 $ 75,816,000   $ 75,816,000 $ 98,969,000  
Deferred tax liabilities recognized for goodwill 0          
Derecognized fair value adjustment and debt issuance costs related to debt redemption       19,800,000    
Adjustments to fair value of assets acquired as a result of the Merger         0  
Adjustments to fair value of liabilities acquired as a result of the Merger         0  
Purchase Price Allocation [Abstract]            
Current assets 455,016,000          
Property, plant, and equipment, net 3,432,144,000          
Goodwill 1,490,797,000 1,490,797,000   1,490,797,000 $ 1,490,797,000  
Other long-term assets 1,023,487,000          
Current liabilities 228,515,000          
Net deferred income tax liabilities 1,059,939,000          
Other deferred credits 279,379,000          
Long-term debt, net 1,470,126,000          
Total purchase price 3,363,485,000          
Cleco Trade Name [Member]            
Business Acquisition [Line Items]            
Trade name intangible asset, useful life         20 years  
Property, Plant and Equipment [Member]            
Fair Value Adjustments [Abstract]            
Assets (1,334,932,000)          
Accumulated Depreciation [Member]            
Fair Value Adjustments [Abstract]            
Assets 1,565,776,000          
Goodwill [Member]            
Fair Value Adjustments [Abstract]            
Assets 1,490,797,000          
Intangible Assets [Member]            
Fair Value Adjustments [Abstract]            
Assets 91,826,000          
Regulatory Asset [Member]            
Fair Value Adjustments [Abstract]            
Assets 250,409,000          
Accumulated Deferred Federal and State Income Taxes [Member]            
Fair Value Adjustments [Abstract]            
Liabilities 126,853,000          
Other Deferred Credits [Member]            
Fair Value Adjustments [Abstract]            
Liabilities 21,175,000          
Long-term Debt [Member]            
Fair Value Adjustments [Abstract]            
Liabilities $ 198,599,000          
Non-vested Stock [Member]            
Business Acquisition [Line Items]            
Remaining LTIP equity awards at close of Merger 0          
Merger Commitments, rate credits [Member] | LPSC [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, charitable contribution, disbursed over 5 years [Member] | LPSC [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, cost savings [Member] | LPSC [Member]            
Business Acquisition [Line Items]            
Merger Commitments           1,200,000
Cleco Holdings [Member]            
Business Acquisition [Line Items]            
Total purchase price consideration $ 3,360,000,000          
Cleco Holdings [Member] | Cash Paid to Cleco shareholders [Member]            
Business Acquisition [Line Items]            
Purchase price consideration, cash paid 3,350,000,000          
Cleco Holdings [Member] | Cash Paid for Cleco LTIP equity awards [Member]            
Business Acquisition [Line Items]            
Purchase price consideration, cash paid $ 9,500,000          
Cleco Power [Member]            
Business Acquisition [Line Items]            
Accumulated depreciation   1,618,241,000   1,618,241,000 $ 1,634,875,000  
Cleco Power [Member] | Cleco Power's solid waste disposal facility bonds, 4.70%, due 2036, callable after November 1, 2016 [Member] | Unsecured Debt [Member]            
Business Acquisition [Line Items]            
Redeemed long term debt     $ 60,000,000      
Cleco Power [Member] | Cleco Power's senior notes, 6.65%, due 2018 [Member] | Unsecured Debt [Member]            
Business Acquisition [Line Items]            
Redeemed long term debt   250,000,000        
Cleco Power [Member] | Merger Commitments, rate credits [Member] | LPSC [Member]            
Business Acquisition [Line Items]            
Merger Commitments           136,000,000
Cleco Power [Member] | Merger Commitments, economic development contribution [Member] | LPSC [Member]            
Business Acquisition [Line Items]            
Merger Commitments   $ 7,000,000   $ 7,000,000   7,000,000
Cleco Power [Member] | Merger Commitments, charitable contribution, disbursed over 5 years [Member] | LPSC [Member]            
Business Acquisition [Line Items]            
Merger Commitments           6,000,000
Cleco Power [Member] | Merger Commitments, economic development contribution, disbursed over 5 years [Member] | LPSC [Member]            
Business Acquisition [Line Items]            
Merger Commitments           2,500,000
Cleco Power [Member] | Merger Commitments, cost savings [Member] | LPSC [Member]            
Business Acquisition [Line Items]            
Merger Commitments           $ 1,200,000