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Common Stock, Long-Term Incentive Compensation Plan, Non-vested Stock and Common Stock Equivalent Units (Details) - Predecessor [Member] - Restricted Stock [Member] - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Apr. 12, 2016
Dec. 31, 2015
Dec. 31, 2014
Non-Vested Stock, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted average grant date fair value, non-vested, beginning of period (in dollars per share) $ 48.11    
Weighted average grant date fair value, non-vested, vested (in dollars per share) 46.53    
Weighted average grant date fair value, non-vested, forfeited (in dollars per share) 54.64    
Weighted average grant date fair value, non-vested, end of period (in dollars per share) $ 0.00 $ 48.11  
Non-Vested Stock, Activity [Roll Forward]      
Shares, non-vested, beginning of period (in shares) 269,988    
Shares, vested (in shares) (217,588)    
Shares, forfeited (in shares) (52,400)    
Shares, non-vested, end of period (in shares) 0 269,988  
Non-Vested Stock, Fair Value Assumptions [Abstract]      
Expected term (in years)   3 years 3 years
Volatility of Cleco stock (in hundredths)   15.80% 17.30%
Correlation between Cleco stock volatility and peer group (in hundredths)   63.10% 66.50%
Expected dividend yield (in hundredths)   2.90% 3.00%
Weighted average fair value (Monte Carlo model) (in dollars per share)   $ 45.60 $ 54.58
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Fair value of shares of non-vested stock vested during period $ 10.1 $ 3.3 $ 5.6
2010 Long-Term Incentive Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Non-vested shares of common stock granted during the year (in shares) 0