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Significant Segment Financial Data (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Other Operating Revenue - Non-Regulated | $ 1.1 |  | $ 3.5 |  |
Revenues | 88.2 | $ 84.0 | 318.5 | $ 290.8 |
Segment Profit (Loss) | 2.8 | 2.3 | 22.0 | 17.8 |
Capital Expenditures | 39.1 | 39.3 | 76.3 | 84.2 |
Segment Assets | 1,264.5 | 1,179.9 | 1,264.5 | 1,179.9 | $ 1,241.9
Billed and Unbilled Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 80.5 |  | 327.3 |  |
Rate Adjustment Mechanism Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 6.6 |  | (12.3) |  |
Gas Segment |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 25.7 | 25.1 | 147.4 | 131.9 |
Segment Profit (Loss) | (3.2) | (2.1) | 9.1 | 7.9 |
Capital Expenditures | 30.9 | 26.0 | 53.1 | 48.7 |
Segment Assets | 730.0 | 661.2 | 730.0 | 661.2 | 714.3
Gas Segment | Billed and Unbilled Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 19.6 |  | 151.1 |  |
Gas Segment | Rate Adjustment Mechanism Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 6.1 |  | (3.7) |  |
Electric |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 61.4 | 57.5 | 167.6 | 154.4 |
Segment Profit (Loss) | 4.5 | 4.1 | 10.2 | 9.3 |
Capital Expenditures | 7.2 | 10.0 | 20.8 | 23.8 |
Segment Assets | 485.7 | 461.2 | 485.7 | 461.2 | 476.9
Electric | Billed and Unbilled Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 60.9 |  | 176.2 |  |
Electric | Rate Adjustment Mechanism Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 0.5 |  | (8.6) |  |
All Other Segments |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Segment Profit (Loss) | 1.2 |  | 1.8 | (0.2) |
Capital Expenditures | 1.0 | 3.3 | 2.4 | 11.7 |
Segment Assets | 42.2 | 50.2 | 42.2 | 50.2 | 44.0
Unregulated Operation |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Other Operating Revenue - Non-Regulated | 1.1 |  | 3.5 |  |
Revenues | 1.1 | 1.4 | 3.5 | 4.5 |
Segment Profit (Loss) | 0.3 | 0.3 | 0.9 | 0.8 |
Segment Assets | $ 6.6 | $ 7.3 | $ 6.6 | $ 7.3 | $ 6.7

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