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Regulatory Matters (Schedule of Regulatory Programs) (Details) - USD ($)
$ in Millions
Apr. 27, 2020
Apr. 24, 2020
Apr. 15, 2020
Feb. 28, 2020
Feb. 25, 2020
Jan. 29, 2020
Nov. 26, 2019
Oct. 31, 2019
Oct. 18, 2019
Oct. 15, 2019
Aug. 21, 2019
Aug. 15, 2019
Jun. 25, 2019
Feb. 28, 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 | 2019 CEP                              
Regulatory Matters [Line Items]                              
Public Utilities, Approved Rate Increase (Decrease), Amount                           $ 15.0  
Regulatory Net Capital Expenditures Included In Filing                           $ 121.7  
Columbia Of Ohio | 2020 CEP                              
Regulatory Matters [Line Items]                              
Public Utilities, Approved Rate Increase (Decrease), Amount       18.1                      
Regulatory Net Capital Expenditures Included In Filing       $ 185.1                      
NIPSCO - Gas | TDSIC 10                              
Regulatory Matters [Line Items]                              
Public Utilities, Approved Rate Increase (Decrease), Amount [1]                         $ 1.6    
Regulatory Net Capital Expenditures Included In Filing [1]                         $ 12.4    
NIPSCO - Gas | TDSIC 11                              
Regulatory Matters [Line Items]                              
Public Utilities, Approved Rate Increase (Decrease), Amount [2]         $ (1.7)                    
Regulatory Net Capital Expenditures Included In Filing [2]         $ 38.7                    
NIPSCO - Gas | FMCA 3                              
Regulatory Matters [Line Items]                              
Public Utilities, Approved Rate Increase (Decrease), Amount [3]             $ 0.3                
Regulatory Net Capital Expenditures Included In Filing [3]             $ 43.0                
Columbia Of Massachusetts | 2020 GSEP                              
Regulatory Matters [Line Items]                              
Public Utilities, Approved Rate Increase (Decrease), Amount [3],[4]               $ 0.9              
Regulatory Net Capital Expenditures Included In Filing [3],[4]               $ 37.5              
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 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 | 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 [3]                 $ 1.6            
Regulatory Net Capital Expenditures Included In Filing [3]                 $ 4.7            
Subsequent Event | NIPSCO - Electric | FMCA 13                              
Regulatory Matters [Line Items]                              
Public Utilities, Approved Rate Increase (Decrease), Amount [3],[5]     $ (1.2)                        
Regulatory Net Capital Expenditures Included In Filing [3],[5]     $ 0.0                        
Subsequent Event | Columbia Of Pennsylvania [Member]                              
Regulatory Matters [Line Items]                              
Public Utilities, Requested Rate Increase (Decrease), Amount   $ 100.4                          
Subsequent Event | Columbia Of Pennsylvania [Member] | DSIC                              
Regulatory Matters [Line Items]                              
Public Utilities, Approved Rate Increase (Decrease), Amount $ 0.9                            
Regulatory Net Capital Expenditures Included In Filing $ 28.2                            
[1]
(1)Incremental capital and revenue are net of amounts included in the step 2 rates.
[2]
(2)Incremental revenue is net of amounts included in the step 2 rates and reflects a more typical 6-month filing period.
[3]
(3)Incremental revenue is inclusive of tracker eligible operations and maintenance expense.
[4]
(4)Incremental revenue reflects a 50% decrease in projected 2020 capital investments due to the October 3, 2019 order from the Massachusetts DPU that imposed work restrictions on Columbia of Massachusetts and the Massachusetts DPU's ongoing investigations.
[5]
(5)No eligible capital investments were made during the investment period.