XML 52 R40.htm IDEA: XBRL DOCUMENT v3.23.2
Significant Segment Financial Data (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues $ 103.4 $ 98.9 $ 323.6 $ 291.5  
Segment Profit (Loss) 4.2 4.9 28.3 26.4  
Capital Expenditures 35.4 29.9 57.6 45.3  
Segment Assets 1,595.3 1,547.1 1,595.3 1,547.1 $ 1,590.4
Billed and Unbilled Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 115.1 113.7 334.6 312.1  
Rate Adjustment Mechanism Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues (11.7) (14.8) (11.0) (20.6)  
Gas Segment          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 38.9 44.6 150.9 148.0  
Segment Profit (Loss) 0.9 1.3 19.9 19.8  
Capital Expenditures 22.0 22.0 33.5 31.0  
Segment Assets 961.9 936.0 961.9 936.0  
Gas Segment | Billed and Unbilled Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 45.3 49.6 167.2 163.3  
Gas Segment | Rate Adjustment Mechanism Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues (6.4) (5.0) (16.3) (15.3)  
Electric          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 64.5 54.3 172.7 143.5  
Segment Profit (Loss) 3.6 3.9 8.9 7.3  
Capital Expenditures 13.4 7.9 24.0 14.2  
Segment Assets 610.5 593.0 610.5 593.0  
Electric | Billed and Unbilled Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues 69.8 64.1 167.4 148.8  
Electric | Rate Adjustment Mechanism Revenue          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Total Operating Revenues (5.3) (9.8) 5.3 (5.3)  
All Other Segments          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Segment Profit (Loss) (0.3) (0.3) (0.5) (0.7)  
Capital Expenditures     0.1 0.1  
Segment Assets $ 22.9 $ 18.1 $ 22.9 $ 18.1