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Components of Gas and Electric Operating Revenue (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues $ 95.7 $ 103.4 $ 274.4 $ 323.6
Billed and Unbilled Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 105.8 115.1 277.1 334.6
Rate Adjustment Mechanism Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues (10.1) (11.7) (2.7) (11.0)
Electric        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 56.4 64.5 130.0 172.7
Electric | Billed and Unbilled Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 58.8 69.8 129.8 167.4
Electric | Rate Adjustment Mechanism Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues (2.4) (5.3) 0.2 5.3
Gas Segment        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 39.3 38.9 144.4 150.9
Gas Segment | Billed and Unbilled Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 47.0 45.3 147.3 167.2
Gas Segment | Rate Adjustment Mechanism Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues (7.7) (6.4) (2.9) (16.3)
Residential        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 48.8 57.7 130.4 166.9
Residential | Electric        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 30.4 39.8 71.0 99.9
Residential | Gas Segment        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 18.4 17.9 59.4 67.0
Commercial & Industrial        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 53.3 54.5 136.5 158.5
Commercial & Industrial | Electric        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 26.3 28.1 54.3 62.9
Commercial & Industrial | Gas Segment        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 27.0 26.4 82.2 95.6
Other        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 3.7 2.9 10.2 9.2
Other | Electric        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 2.1 1.9 4.5 4.6
Other | Gas Segment        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues $ 1.6 $ 1.0 $ 5.7 $ 4.6