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Regulatory Matters (Rate Case Action) (Details) - USD ($)
$ in Millions
Oct. 31, 2018
Aug. 28, 2018
Apr. 13, 2018
Mar. 16, 2018
Feb. 13, 2018
Sep. 27, 2017
NIPSCO - Gas            
Regulatory Matters [Line Items]            
Public Utilities, Requested Rate Increase (Decrease), Amount [1]           $ 138.1
Public Utilities, Approved Rate Increase (Decrease), Amount [1]           $ 107.3
Columbia Of Pennsylvania            
Regulatory Matters [Line Items]            
Public Utilities, Requested Rate Increase (Decrease), Amount       $ 46.9    
Public Utilities, Approved Rate Increase (Decrease), Amount       $ 26.0    
Columbia Of Virginia            
Regulatory Matters [Line Items]            
Public Utilities, Requested Rate Increase (Decrease), Amount [2]   $ 14.2        
Columbia Of Maryland            
Regulatory Matters [Line Items]            
Public Utilities, Requested Rate Increase (Decrease), Amount     $ 4.6      
Public Utilities, Approved Rate Increase (Decrease), Amount     2.2   $ (1.3)  
Columbia Of Massachusetts            
Regulatory Matters [Line Items]            
Public Utilities, Requested Rate Increase (Decrease), Amount     $ 24.1      
NIPSCO - Electric            
Regulatory Matters [Line Items]            
Public Utilities, Requested Rate Increase (Decrease), Amount $ 21.4          
[1] Rates will be implemented in three steps, with implementation of step 1 rates effective October 1, 2018. Step 2 rates will be effective on or about March 1, 2019, and step 3 rates will be effective on January 1, 2020. The IURC’s order also dismissed NIPSCO from phase 2 of the IURC’s TCJA investigation.
[2] Rates implemented subject to refund pending a final order from the VSCC.