XML 65 R54.htm IDEA: XBRL DOCUMENT v3.22.1
Regulatory Matters (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Apr. 06, 2022
Public Utilities, General Disclosures [Line Items]      
Regulatory Deferral - Joint Venture $ 2.9 $ 0.0  
Minimum | Subsequent Event      
Public Utilities, General Disclosures [Line Items]      
Recommended Rate increase, percentage     4.00%
Recommended Rate Increase, Amount     $ 35.2
Maximum | Subsequent Event      
Public Utilities, General Disclosures [Line Items]      
Recommended Rate increase, percentage     6.30%
Recommended Rate Increase, Amount     $ 57.6
Columbia Of Ohio      
Public Utilities, General Disclosures [Line Items]      
Public Utilities, Requested Rate Increase (Decrease), Percentage 21.30%    
Public Utilities, Requested Rate Increase (Decrease), Amount $ 221.4