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Discontinued Operations (Income Statement Disclosures) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Jun. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015
Net Revenues |  |  |  |  |  |  |  |  |
Transportation and storage revenues |  |  |  |  | $ 0.0 |  |  |  | $ 561.4
Other revenues |  |  |  |  | 0.0 |  |  |  | 94.3
Total Sales Revenues |  |  |  |  | 0.0 |  |  |  | 655.7
Less: Cost of sales (excluding depreciation and amortization) |  |  |  |  | 0.0 |  |  |  | 0.2
Net Revenues |  |  |  |  | 0.0 |  |  |  | 655.5
Operating Expenses |  |  |  |  |  |  |  |  |
Operation and maintenance |  |  |  |  | 5.5 |  |  |  | 374.8
Depreciation and amortization |  |  |  |  | 0.0 |  |  |  | 66.4
Gain on sale of assets |  |  |  |  | 0.0 |  |  |  | (13.6)
Other taxes |  |  |  |  | 0.0 |  |  |  | 38.0
Total Operating Expenses |  |  |  |  | 5.5 |  |  |  | 465.6
Equity Earnings in Unconsolidated Affiliates |  |  |  |  | 0.0 |  |  |  | 29.1
Operating Income (Loss) from Discontinued Operations |  |  |  |  | (5.5) |  |  |  | 219.0
Other Income (Deductions) |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  | 0.0 |  |  |  | (37.1)
Other, net |  |  |  |  | 0.0 |  |  |  | (7.2)
Total Other Deductions |  |  |  |  | 0.0 |  |  |  | (29.9)
Income (Loss) from Discontinued Operations before Income Taxes |  |  |  |  | (5.5) |  |  |  | 189.1
Income Taxes |  |  |  |  | 14.2 |  |  |  | 80.6
Income (Loss) from Discontinued Operations - net of taxes |  | $ 3.5 | $ (0.1) | $ 0.0 | (19.7) |  | $ (0.1) | $ 3.4 | 108.5
Columbia Pipeline Group Operations | Discontinued Operations, Spinoff |  |  |  |  |  |  |  |  |
Net Revenues |  |  |  |  |  |  |  |  |
Transportation and storage revenues |  |  |  |  | 0.0 |  |  |  | 561.4
Other revenues |  |  |  |  | 0.0 |  |  |  | 94.3
Total Sales Revenues |  |  |  |  | 0.0 |  |  |  | 655.7
Less: Cost of sales (excluding depreciation and amortization) |  |  |  |  | 0.0 |  |  |  | 0.2
Net Revenues |  |  |  |  | 0.0 |  |  |  | 655.5
Operating Expenses |  |  |  |  |  |  |  |  |
Operation and maintenance | [1] |  |  |  | 5.5 |  |  |  | 374.8
Depreciation and amortization |  |  |  |  | 0.0 |  |  |  | 66.4
Gain on sale of assets |  |  |  |  | 0.0 |  |  |  | (13.6)
Other taxes |  |  |  |  | 0.0 |  |  |  | 38.0
Total Operating Expenses |  |  |  |  | 5.5 |  |  |  | 465.6
Equity Earnings in Unconsolidated Affiliates |  |  |  |  | 0.0 |  |  |  | 29.1
Operating Income (Loss) from Discontinued Operations |  |  |  |  | (5.5) |  |  |  | 219.0
Other Income (Deductions) |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  | 0.0 |  |  |  | (37.1)
Other, net |  |  |  |  | 0.0 |  |  |  | (7.8)
Total Other Deductions |  |  |  |  | 0.0 |  |  |  | (29.3)
Income (Loss) from Discontinued Operations before Income Taxes |  |  |  |  | (5.5) |  |  |  | 189.7
Income Taxes |  |  |  |  | 14.2 | [2] |  |  | 80.9
Income (Loss) from Discontinued Operations - net of taxes |  |  |  |  | (19.7) |  |  |  | 108.8
Corporate and Other | Discontinued Operations, Spinoff |  |  |  |  |  |  |  |  |
Net Revenues |  |  |  |  |  |  |  |  |
Transportation and storage revenues |  |  |  |  | 0.0 |  |  |  | 0.0
Other revenues |  |  |  |  | 0.0 |  |  |  | 0.0
Total Sales Revenues |  |  |  |  | 0.0 |  |  |  | 0.0
Less: Cost of sales (excluding depreciation and amortization) |  |  |  |  | 0.0 |  |  |  | 0.0
Net Revenues |  |  |  |  | 0.0 |  |  |  | 0.0
Operating Expenses |  |  |  |  |  |  |  |  |
Operation and maintenance |  |  |  |  | 0.0 |  |  |  | 0.0
Depreciation and amortization |  |  |  |  | 0.0 |  |  |  | 0.0
Gain on sale of assets |  |  |  |  | 0.0 |  |  |  | 0.0
Other taxes |  |  |  |  | 0.0 |  |  |  | 0.0
Total Operating Expenses |  |  |  |  | 0.0 |  |  |  | 0.0
Equity Earnings in Unconsolidated Affiliates |  |  |  |  | 0.0 |  |  |  | 0.0
Operating Income (Loss) from Discontinued Operations |  |  |  |  | 0.0 |  |  |  | 0.0
Other Income (Deductions) |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  | 0.0 |  |  |  | 0.0
Other, net |  |  |  |  | 0.0 |  |  |  | (0.6)
Total Other Deductions |  |  |  |  | 0.0 |  |  |  | (0.6)
Income (Loss) from Discontinued Operations before Income Taxes |  |  |  |  | 0.0 |  |  |  | (0.6)
Income Taxes |  |  |  |  | 0.0 |  |  |  | (0.3)
Income (Loss) from Discontinued Operations - net of taxes |  |  |  |  | $ 0.0 |  |  |  | $ (0.3)
[1] | Includes approximately $5.5 million and $54.4 million of transaction costs related to the Separation for the three and nine months ended September 30, 2015, respectively.
[2] | Primarily attributable to the write-off of consolidated state income tax benefits resulting from the Separation.

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