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Components of Gas and Electric Operating Revenue (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues $ 98.9 $ 96.6 $ 291.5 $ 235.4
Billed and Unbilled Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 113.7 96.3 312.1 255.3
Rate Adjustment Mechanism Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues (14.8) 0.3 (20.6) (19.9)
Electric        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 54.3 56.6 143.5 116.7
Electric | Billed and Unbilled Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 64.1 58.3 148.8 124.1
Electric | Rate Adjustment Mechanism Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues (9.8) (1.7) (5.3) (7.4)
Gas Segment        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 44.6 40.0 148.0 118.7
Gas Segment | Billed and Unbilled Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 49.6 38.0 163.3 131.2
Gas Segment | Rate Adjustment Mechanism Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues (5.0) 2.0 (15.3) (12.5)
Residential | Billed and Unbilled Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 51.9 45.7 146.6 121.5
Residential | Electric | Billed and Unbilled Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 33.8 30.8 83.0 68.9
Residential | Gas Segment | Billed and Unbilled Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 18.1 14.9 63.6 52.6
Commercial & Industrial | Billed and Unbilled Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 53.7 47.3 149.4 123.3
Commercial & Industrial | Electric | Billed and Unbilled Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 25.7 25.5 56.7 51.4
Commercial & Industrial | Gas Segment | Billed and Unbilled Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 28.0 21.8 92.7 71.9
Other | Billed and Unbilled Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 8.1 3.3 16.1 10.5
Other | Electric | Billed and Unbilled Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues 4.6 2.0 9.1 3.8
Other | Gas Segment | Billed and Unbilled Revenue        
Operating Revenues [Line Items]        
Total Gas and Electric Operating Revenues $ 3.5 $ 1.3 $ 7.0 $ 6.7