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Significant Segment Financial Data (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 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 |  | $ 2.4 |  |
Revenues | 84.5 | $ 80.8 | 230.3 | $ 206.8 |
Segment Profit (Loss) | 3.6 | 3.1 | 19.2 | 15.5 |
Capital Expenditures | 27.1 | 27.4 | 37.2 | 44.9 |
Segment Assets | 1,234.6 | 1,137.7 | 1,234.6 | 1,137.7 | $ 1,241.9
Billed and Unbilled Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 93.8 |  | 246.8 |  |
Rate Adjustment Mechanism Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | (10.4) |  | (18.9) |  |
Gas Segment |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 34.7 | 32.0 | 121.7 | 106.8 |
Segment Profit (Loss) | (0.3) | 0.1 | 12.3 | 10.0 |
Capital Expenditures | 18.6 | 17.0 | 22.2 | 22.7 |
Segment Assets | 703.2 | 637.0 | 703.2 | 637.0 | 714.3
Gas Segment | Billed and Unbilled Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 40.1 |  | 131.5 |  |
Gas Segment | Rate Adjustment Mechanism Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | (5.4) |  | (9.8) |  |
Electric |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 48.7 | 47.4 | 106.2 | 96.9 |
Segment Profit (Loss) | 2.7 | 3.1 | 5.7 | 5.2 |
Capital Expenditures | 7.6 | 5.5 | 13.6 | 13.8 |
Segment Assets | 479.3 | 446.4 | 479.3 | 446.4 | 476.9
Electric | Billed and Unbilled Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | 53.7 |  | 115.3 |  |
Electric | Rate Adjustment Mechanism Revenue |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Revenues | (5.0) |  | (9.1) |  |
All Other Segments |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |
Segment Profit (Loss) | 1.0 | (0.2) | 0.6 | (0.2) |
Capital Expenditures | 0.9 | 4.9 | 1.4 | 8.4 |
Segment Assets | 45.7 | 47.2 | 45.7 | 47.2 | 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 |  | 2.4 |  |
Revenues | 1.1 | 1.4 | 2.4 | 3.1 |
Segment Profit (Loss) | 0.2 | 0.1 | 0.6 | 0.5 |
Segment Assets | $ 6.4 | $ 7.1 | $ 6.4 | $ 7.1 | $ 6.7

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