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Significant Segment Financial Data (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Other Operating Revenue - Non-Regulated |  | $ 1.1 | $ 0.9 | $ 3.5 |
Total Operating Revenues | $ 85.3 | 88.2 | 321.8 | 318.5 |
Segment Profit (Loss) | 2.3 | 2.8 | 32.8 | 22.0 |
Capital Expenditures | 38.0 | 39.1 | 76.7 | 76.3 |
Segment Assets | 1,309.7 | 1,264.5 | 1,309.7 | 1,264.5 | $ 1,298.3
Billed and Unbilled Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 77.8 | 80.5 | 332.8 | 327.3 |
Rate Adjustment Mechanism Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 7.5 | 6.6 | (11.9) | (12.3) |
Gas Segment |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 24.9 | 25.7 | 143.9 | 147.4 |
Segment Profit (Loss) | (3.9) | (3.2) | 10.1 | 9.1 |
Capital Expenditures | 26.9 | 30.9 | 48.3 | 53.1 |
Segment Assets | 780.7 | 730.0 | 780.7 | 730.0 |
Gas Segment | Billed and Unbilled Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 20.5 | 19.6 | 160.0 | 151.1 |
Gas Segment | Rate Adjustment Mechanism Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 4.4 | 6.1 | (16.1) | (3.7) |
Electric |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 60.4 | 61.4 | 177.0 | 167.6 |
Segment Profit (Loss) | 4.4 | 4.5 | 9.7 | 10.2 |
Capital Expenditures | 9.2 | 7.2 | 24.1 | 20.8 |
Segment Assets | 507.6 | 485.7 | 507.6 | 485.7 |
Electric | Billed and Unbilled Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 57.3 | 60.9 | 172.8 | 176.2 |
Electric | Rate Adjustment Mechanism Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Total Operating Revenues | 3.1 | 0.5 | 4.2 | (8.6) |
All Other Segments |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Segment Profit (Loss) | 1.8 | 1.2 | 2.8 | 1.8 |
Capital Expenditures | 1.9 | 1.0 | 4.3 | 2.4 |
Segment Assets | 21.1 | 42.2 | 21.1 | 42.2 |
Unregulated Operation |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Other Operating Revenue - Non-Regulated |  | 1.1 | 0.9 | 3.5 |
Total Operating Revenues |  | 1.1 | 0.9 | 3.5 |
Segment Profit (Loss) |  | 0.3 | 10.2 | 0.9 |
Segment Assets | $ 0.3 | $ 6.6 | $ 0.3 | $ 6.6 |

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