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Significant Segment Financial Data (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Other Operating Revenue - Non-Regulated | $ 0.0 | $ 0.0 |  | $ 0.9 |
Total Operating Revenues | 83.9 | 84.4 | $ 214.3 | 236.5 |
Segment Profit (Loss) | 3.1 | 4.0 | 18.3 | 30.5 |
Capital Expenditures | 32.0 | 27.8 | 48.8 | 38.7 |
Segment Assets | 1,384.5 | 1,279.3 | 1,384.5 | 1,279.3 | $ 1,370.8
Billed and Unbilled Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 86.7 | 93.1 | 223.7 | 255.0 |
Rate Adjustment Mechanism Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | (2.8) | (8.7) | (9.4) | (19.4) |
Gas Segment |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 33.7 | 32.6 | 103.9 | 119.0 |
Segment Profit (Loss) | (0.1) | 0.3 | 12.2 | 14.0 |
Capital Expenditures | 16.8 | 18.1 | 22.6 | 21.4 |
Segment Assets | 821.1 | 760.0 | 821.1 | 760.0 |
Gas Segment | Billed and Unbilled Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 34.5 | 40.3 | 110.9 | 139.5 |
Gas Segment | Rate Adjustment Mechanism Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | (0.8) | (7.7) | (7.0) | (20.5) |
Electric |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 50.2 | 51.8 | 110.4 | 116.6 |
Segment Profit (Loss) | 3.1 | 3.4 | 5.7 | 5.3 |
Capital Expenditures | 14.0 | 8.3 | 23.9 | 14.9 |
Segment Assets | 543.8 | 500.4 | 543.8 | 500.4 |
Electric | Billed and Unbilled Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 52.2 | 52.8 | 112.8 | 115.5 |
Electric | Rate Adjustment Mechanism Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | (2.0) | (1.0) | (2.4) | 1.1 |
All Other Segments |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Segment Profit (Loss) | 0.1 | 0.2 | 0.4 | 1.0 |
Capital Expenditures | 1.2 | 1.4 | 2.3 | 2.4 |
Segment Assets | $ 19.6 | 18.3 | $ 19.6 | 18.3 |
Unregulated Operation |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Other Operating Revenue - Non-Regulated |  |  |  | 0.9 |
Total Operating Revenues |  |  |  | 0.9 |
Segment Profit (Loss) |  | 0.1 |  | 10.2 |
Segment Assets |  | $ 0.6 |  | $ 0.6 |

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