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Significant Segment Financial Data (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | $ 96.6 | $ 83.9 | $ 235.4 | $ 214.3 |
Segment Profit (Loss) | 2.7 | 3.1 | 21.6 | 18.3 |
Capital Expenditures | 28.4 | 32.0 | 42.5 | 48.8 |
Segment Assets | 1,477.1 | 1,384.5 | 1,477.1 | 1,384.5 | $ 1,477.9
Billed and Unbilled Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 96.3 | 86.7 | 255.3 | 223.7 |
Rate Adjustment Mechanism Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 0.3 | (2.8) | (19.9) | (9.4) |
Gas Segment |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 40.0 | 33.7 | 118.7 | 103.9 |
Segment Profit (Loss) | (0.2) | (0.1) | 16.2 | 12.2 |
Capital Expenditures | 18.9 | 16.8 | 23.2 | 22.6 |
Segment Assets | 878.3 | 821.1 | 878.3 | 821.1 |
Gas Segment | Billed and Unbilled Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 38.0 | 34.5 | 131.2 | 110.9 |
Gas Segment | Rate Adjustment Mechanism Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 2.0 | (0.8) | (12.5) | (7.0) |
Gas Segment | Other Operating Revenue Non-Regulated |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 0.0 | 0.0 | 0.0 | 0.0 |
Electric |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 56.6 | 50.2 | 116.7 | 110.4 |
Segment Profit (Loss) | 3.4 | 3.1 | 6.3 | 5.7 |
Capital Expenditures | 9.2 | 14.0 | 18.7 | 23.9 |
Segment Assets | 577.3 | 543.8 | 577.3 | 543.8 |
Electric | Billed and Unbilled Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 58.3 | 52.2 | 124.1 | 112.8 |
Electric | Rate Adjustment Mechanism Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | (1.7) | (2.0) | (7.4) | (2.4) |
Electric | Other Operating Revenue Non-Regulated |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 0.0 | 0.0 | 0.0 | 0.0 |
All Other Segments |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Segment Profit (Loss) | (0.6) | 0.1 | (1.0) | 0.4 |
Capital Expenditures | 0.3 | 1.2 | 0.6 | 2.3 |
Segment Assets | 21.5 | $ 19.6 | 21.5 | $ 19.6 |
Non- Regulated Operation |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Segment Profit (Loss) | $ 0.1 |  | $ 0.1 |  |

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