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v3.22.2

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

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