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Business Combinations - Narrative (Details) - USD ($)
9 Months Ended
Apr. 13, 2016
Apr. 07, 2016
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]          
Accumulated depreciation $ 0     $ 303,727,000 $ 192,348,000
Goodwill 1,490,797,000     1,490,797,000 1,490,797,000
Deferred income tax assets or liabilities recognized for goodwill 0        
Rate credits | LPSC          
Business Acquisition [Line Items]          
Merger commitments 136,000,000        
Economic development contribution | LPSC          
Business Acquisition [Line Items]          
Merger commitments 7,000,000        
Charitable contributions to be disbursed over five years | LPSC          
Business Acquisition [Line Items]          
Merger commitments 6,000,000        
Contributions for economic development | LPSC          
Business Acquisition [Line Items]          
Merger commitments 2,500,000        
Cost savings | LPSC          
Business Acquisition [Line Items]          
Merger commitments $ 1,200,000        
Restricted Stock          
Business Acquisition [Line Items]          
Remaining LTIP equity awards (in shares) 0        
Trade name          
Business Acquisition [Line Items]          
Intangible asset expected useful life (in years) 20 years   20 years    
CLECO POWER          
Business Acquisition [Line Items]          
Accumulated depreciation       $ 1,804,563,000 $ 1,712,590,000
CLECO POWER | Rate credits | LPSC          
Business Acquisition [Line Items]          
Merger commitments $ 136,000,000 $ 136,000,000      
CLECO POWER | Economic development contribution | LPSC          
Business Acquisition [Line Items]          
Merger commitments 7,000,000 7,000,000      
CLECO POWER | Charitable contributions to be disbursed over five years | LPSC          
Business Acquisition [Line Items]          
Merger commitments $ 6,000,000 $ 6,000,000      
Disbursement period 5 years 5 years      
CLECO POWER | Contributions for economic development | LPSC          
Business Acquisition [Line Items]          
Merger commitments $ 2,500,000 $ 2,500,000      
Disbursement period 5 years 5 years      
CLECO POWER | Cost savings | LPSC          
Business Acquisition [Line Items]          
Merger commitments $ 1,200,000 $ 1,200,000      
Cleco Corporation          
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 Corporation | Cash Paid to Cleco shareholders          
Business Acquisition [Line Items]          
Cash paid 3,350,000,000        
Cleco Corporation | Cash Paid for Cleco LTIP equity awards          
Business Acquisition [Line Items]          
Cash paid $ 9,500,000