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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.