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Regulatory Matters (Schedule of Regulatory Programs) (Details) - USD ($) $ in Millions | Oct. 29, 2020 | Oct. 15, 2020 | Sep. 29, 2020 | Sep. 18, 2020 | Aug. 25, 2020 | Jul. 24, 2020 | Jun. 19, 2020 | May 26, 2020 | May 15, 2020 | Apr. 27, 2020 | Apr. 24, 2020 | Apr. 15, 2020 | Feb. 28, 2020 | Feb. 25, 2020 | Jan. 29, 2020 | Nov. 26, 2019 | Oct. 18, 2019 | Oct. 15, 2019 | Aug. 21, 2019 | Aug. 15, 2019 | Oct. 31, 2018
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Columbia Of Ohio | 2020 IRP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 32.9 |  |  |  |  |  |  |  |
Regulatory Net Capital Expenditures Included In Filing |  |  |  |  |  |  |  |  |  |  |  |  |  | 234.4 |  |  |  |  |  |  |  |
Columbia Of Ohio | 2020 CEP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 18.0 |  |  |  |  |  |  |  |
Regulatory Net Capital Expenditures Included In Filing |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 185.1 |  |  |  |  |  |  |  |
NIPSCO - Gas | TDSIC 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1.7) |  |  |  |  |  |  |
Regulatory Net Capital Expenditures Included In Filing | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38.7 |  |  |  |  |  |  |
NIPSCO - Gas | FMCA 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.3 |  |  |  |  |
Regulatory Net Capital Expenditures Included In Filing | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 43.0 |  |  |  |  |
NIPSCO - Gas | FMCA 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | [2] |  |  |  |  |  |  |  | $ 1.6 |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Net Capital Expenditures Included In Filing | [2] |  |  |  |  |  |  |  | $ 43.2 |  |  |  |  |  |  |  |  |  |  |  |  |
NIPSCO - Gas | TDSIC 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  | $ 1.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Net Capital Expenditures Included In Filing |  |  |  |  |  | $ 26.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Columbia Of Virginia | 2020 SAVE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.8 |
Regulatory Net Capital Expenditures Included In Filing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50.0 |
Columbia Of Virginia | 2021 SAVE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  |  |  | $ 5.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Net Capital Expenditures Included In Filing |  |  |  |  |  |  | $ 46.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Columbia Of Kentucky | 2020 SMRP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.2 |  |  |
Regulatory Net Capital Expenditures Included In Filing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40.4 |  |  |
Columbia Of Maryland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  | $ 2.0 |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  | $ 5.0 |  |  |  |  |  |  |  |  |  |  |  |
Columbia Of Maryland | 2020 STRIDE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.3 |  |  |  |  |  |
Regulatory Net Capital Expenditures Included In Filing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15.0 |  |  |  |  |  |
NIPSCO - Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (53.5)
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21.4
NIPSCO - Electric | TDSIC 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 28.1 |  |
Regulatory Net Capital Expenditures Included In Filing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 131.1 |  |
NIPSCO - Electric | FMCA 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.6 |  |  |  |
Regulatory Net Capital Expenditures Included In Filing | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.7 |  |  |  |
NIPSCO - Electric | FMCA 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | [2],[3] |  |  |  |  |  |  |  |  |  |  |  | $ (1.2) |  |  |  |  |  |  |  |  |
Regulatory Net Capital Expenditures Included In Filing | [2],[3] |  |  |  |  |  |  |  |  |  |  |  | $ 0.0 |  |  |  |  |  |  |  |  |
NIPSCO - Electric | TDSIC 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  | $ 13.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Net Capital Expenditures Included In Filing |  |  |  | $ 122.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Columbia Of Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  |  | $ 100.4 |  |  |  |  |  |  |  |  |  |
Columbia Of Pennsylvania | DSIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  | $ 0.9 |  |  |  |  |  |  |  |  |  |  |
Regulatory Net Capital Expenditures Included In Filing |  |  |  |  |  |  |  |  |  |  | $ 28.2 |  |  |  |  |  |  |  |  |  |  |
Columbia Of Pennsylvania | DSIC Q2 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  | $ 0.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Net Capital Expenditures Included In Filing |  |  |  |  |  |  |  | $ 28.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Columbia Of Pennsylvania | DSIC Q3 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  | $ 2.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Net Capital Expenditures Included In Filing |  |  |  |  | $ 85.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Columbia Of Kentucky | 2021 SMRP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 5.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Net Capital Expenditures Included In Filing |  |  | $ 50.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Columbia Of Maryland | 2021 STRIDE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  | $ 1.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Net Capital Expenditures Included In Filing |  | $ 16.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | (2)Incremental revenue is net of amounts included in the step 2 rates and reflects a more typical 6-month filing period.
[2] | (3)Incremental revenue is inclusive of tracker eligible operations and maintenance expense.
[3] | (4)No eligible capital investments were made during the investment period.

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