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Common Stock (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2016
USD ($)
Apr. 12, 2016
USD ($)
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of plans | plan       2
CLECO POWER        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Amount of stock based compensation capitalized in property, plant, and equipment     $ 0.6  
Restricted Stock | CLECO POWER        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Pre-tax compensation expense     1.0  
Tax benefit     $ 0.4  
PREDECESSOR        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Amount of stock based compensation capitalized in property, plant, and equipment   $ 0.6    
PREDECESSOR | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of shares of non-vested stock vested during period   $ 10.1    
Service period   3 years    
Pre-tax compensation expense   $ 3.2    
Tax benefit   1.2    
Merger expense due to accelerated vesting of LTIP shares $ 2.3      
Compensation expense, non-forfeitable dividends paid on non-vested stock not expected to vest and stock options   $ 0.1    
LTIP | PREDECESSOR | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-vested shares of common stock granted during the year (in shares) | shares   0