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Business Combinations (Details) - USD ($)
9 Months Ended
Apr. 13, 2016
Dec. 31, 2016
Dec. 31, 2017
Apr. 07, 2016
Business Acquisition [Line Items]        
Accumulated Depreciation $ 0 $ 75,816,000 $ 192,348,000  
Deferred Tax Liabilities, Goodwill 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  
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      
Property, Plant and Equipment [Member]        
Fair Value, Adjustment Disclosure [Abstract]        
Assets (1,334,932,000)      
Accumulated Depreciation [Member]        
Fair Value, Adjustment Disclosure [Abstract]        
Assets (1,565,776,000)      
Goodwill [Member]        
Fair Value, Adjustment Disclosure [Abstract]        
Assets 1,490,797,000      
Intangible Assets [Member]        
Fair Value, Adjustment Disclosure [Abstract]        
Assets 91,826,000      
Regulatory Assets [Member]        
Fair Value, Adjustment Disclosure [Abstract]        
Assets 250,409,000      
Deferred Income Tax Liabilities [Member]        
Fair Value, Adjustment Disclosure [Abstract]        
Liabilities 126,853,000      
Other Deferred Credits [Member]        
Fair Value, Adjustment Disclosure [Abstract]        
Liabilities 21,175,000      
Long-term Debt [Member]        
Fair Value, Adjustment Disclosure [Abstract]        
Liabilities $ 198,599,000      
Merger Commitments, rate credits [Member] | Louisiana Public Service Commission [Member]        
Business Acquisition [Line Items]        
Merger Commitments       $ 136,000,000
Merger Commitments, economic development contribution [Member] | Louisiana Public Service Commission [Member]        
Business Acquisition [Line Items]        
Merger Commitments       7,000,000
Merger Commitments, charitable contribution, disbursed over 5 years [Member] | Louisiana Public Service Commission [Member]        
Business Acquisition [Line Items]        
Merger Commitments       6,000,000
Merger Commitments, economic development contribution, disbursed over 5 years [Member] | Louisiana Public Service Commission [Member]        
Business Acquisition [Line Items]        
Merger Commitments       2,500,000
Merger Commitments, cost savings [Member] | Louisiana Public Service Commission [Member]        
Business Acquisition [Line Items]        
Merger Commitments       1,200,000
Restricted Stock [Member]        
Business Acquisition [Line Items]        
Remaining LTIP equity awards 0      
Trade Names [Member]        
Business Acquisition [Line Items]        
Intangible asset expected useful life (in years) 20 years 20 years    
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 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 $ 1,712,590,000  
Cleco Power [Member] | Merger Commitments, rate credits [Member] | Louisiana Public Service Commission [Member]        
Business Acquisition [Line Items]        
Merger Commitments       136,000,000
Cleco Power [Member] | Merger Commitments, economic development contribution [Member] | Louisiana Public Service Commission [Member]        
Business Acquisition [Line Items]        
Merger Commitments       7,000,000
Cleco Power [Member] | Merger Commitments, charitable contribution, disbursed over 5 years [Member] | Louisiana Public Service Commission [Member]        
Business Acquisition [Line Items]        
Merger Commitments       6,000,000
Cleco Power [Member] | Merger Commitments, economic development contribution, disbursed over 5 years [Member] | Louisiana Public Service Commission [Member]        
Business Acquisition [Line Items]        
Merger Commitments       2,500,000
Cleco Power [Member] | Merger Commitments, cost savings [Member] | Louisiana Public Service Commission [Member]        
Business Acquisition [Line Items]        
Merger Commitments       $ 1,200,000