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Regulatory Matters (Schedule of Regulatory Programs) (Details) - USD ($)
$ in Millions
Oct. 29, 2020
Oct. 15, 2020
Sep. 29, 2020
Sep. 18, 2020
Aug. 25, 2020
Jul. 24, 2020
Jun. 19, 2020
May 26, 2020
May 15, 2020
Apr. 27, 2020
Apr. 24, 2020
Apr. 15, 2020
Feb. 28, 2020
Feb. 25, 2020
Jan. 29, 2020
Nov. 26, 2019
Oct. 18, 2019
Oct. 15, 2019
Aug. 21, 2019
Aug. 15, 2019
Oct. 31, 2018
Columbia Of Ohio | 2020 IRP                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Approved Rate Increase (Decrease), Amount                         $ 32.9                
Regulatory Net Capital Expenditures Included In Filing                         234.4                
Columbia Of Ohio | 2020 CEP                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Approved Rate Increase (Decrease), Amount                         18.0                
Regulatory Net Capital Expenditures Included In Filing                         $ 185.1                
NIPSCO - Gas | TDSIC 11                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Approved Rate Increase (Decrease), Amount [1]                           $ (1.7)              
Regulatory Net Capital Expenditures Included In Filing [1]                           $ 38.7              
NIPSCO - Gas | FMCA 3                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Approved Rate Increase (Decrease), Amount [2]                               $ 0.3          
Regulatory Net Capital Expenditures Included In Filing [2]                               $ 43.0          
NIPSCO - Gas | FMCA 4                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Approved Rate Increase (Decrease), Amount [2]               $ 1.6                          
Regulatory Net Capital Expenditures Included In Filing [2]               $ 43.2                          
NIPSCO - Gas | TDSIC 1                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Approved Rate Increase (Decrease), Amount         $ 1.3                                
Regulatory Net Capital Expenditures Included In Filing         $ 26.0                                
Columbia Of Virginia | 2020 SAVE                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Requested Rate Increase (Decrease), Amount                                       $ 3.8  
Regulatory Net Capital Expenditures Included In Filing                                       $ 50.0  
Columbia Of Virginia | 2021 SAVE                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Requested Rate Increase (Decrease), Amount           $ 5.2                              
Regulatory Net Capital Expenditures Included In Filing           $ 46.4                              
Columbia Of Kentucky | 2020 SMRP                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Requested Rate Increase (Decrease), Amount                                   $ 4.2      
Regulatory Net Capital Expenditures Included In Filing                                   $ 40.4      
Columbia Of Maryland                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Approved Rate Increase (Decrease), Amount                 $ 2.0                        
Public Utilities, Requested Rate Increase (Decrease), Amount                 $ 5.0                        
Columbia Of Maryland | 2020 STRIDE                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Approved Rate Increase (Decrease), Amount                             $ 1.3            
Regulatory Net Capital Expenditures Included In Filing                             $ 15.0            
NIPSCO - Electric                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Approved Rate Increase (Decrease), Amount                                         $ (53.5)
Public Utilities, Requested Rate Increase (Decrease), Amount                                         $ 21.4
NIPSCO - Electric | TDSIC 6                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Requested Rate Increase (Decrease), Amount                                     $ 28.1    
Regulatory Net Capital Expenditures Included In Filing                                     $ 131.1    
NIPSCO - Electric | FMCA 12                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Approved Rate Increase (Decrease), Amount [2]                                 $ 1.6        
Regulatory Net Capital Expenditures Included In Filing [2]                                 $ 4.7        
NIPSCO - Electric | FMCA 13                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Approved Rate Increase (Decrease), Amount [2],[3]                       $ (1.2)                  
Regulatory Net Capital Expenditures Included In Filing [2],[3]                       $ 0.0                  
NIPSCO - Electric | TDSIC 7                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Requested Rate Increase (Decrease), Amount     $ 13.0                                    
Regulatory Net Capital Expenditures Included In Filing     $ 122.3                                    
Columbia Of Pennsylvania                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Requested Rate Increase (Decrease), Amount                     $ 100.4                    
Columbia Of Pennsylvania | DSIC                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Approved Rate Increase (Decrease), Amount                   $ 0.9                      
Regulatory Net Capital Expenditures Included In Filing                   $ 28.2                      
Columbia Of Pennsylvania | DSIC Q2 2020                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Approved Rate Increase (Decrease), Amount             $ 0.8                            
Regulatory Net Capital Expenditures Included In Filing             $ 28.6                            
Columbia Of Pennsylvania | DSIC Q3 2020                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Approved Rate Increase (Decrease), Amount       $ 2.6                                  
Regulatory Net Capital Expenditures Included In Filing       $ 85.0                                  
Subsequent Event | Columbia Of Kentucky | 2021 SMRP                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 5.8                                      
Regulatory Net Capital Expenditures Included In Filing   $ 50.0                                      
Subsequent Event | Columbia Of Maryland | 2021 STRIDE                                          
Regulatory Matters [Line Items]                                          
Public Utilities, Approved Rate Increase (Decrease), Amount $ 1.3                                        
Regulatory Net Capital Expenditures Included In Filing $ 16.9                                        
[1] (2)Incremental revenue is net of amounts included in the step 2 rates and reflects a more typical 6-month filing period.
[2] (3)Incremental revenue is inclusive of tracker eligible operations and maintenance expense.
[3] (4)No eligible capital investments were made during the investment period.