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Report of Business Segments (Tables) | 9 Months Ended
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Sep. 30, 2015
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] | The following tables summarize the results of the Company's business segments during the three and nine months ended September 30, 2015 and 2014.
Three Months Ended September 30, 2015 | Electric Utility | Natural Gas Midstream Operations | Other Operations | Eliminations | Total
(In millions) |  |  |  |  |
Operating revenues | $ | 719.8 |  | $ | — |  | $ | — |  | $ | — |  | $ | 719.8 |
Cost of sales | 259.8 |  | — |  | — |  | — |  | 259.8 |
Other operation and maintenance | 107.4 |  | 4.9 |  | (2.9 | ) | — |  | 109.4 |
Depreciation and amortization | 75.9 |  | — |  | 2.0 |  | — |  | 77.9 |
Taxes other than income | 21.0 |  | — |  | 0.9 |  | — |  | 21.9 |
Operating income (loss) | 255.7 |  | (4.9 | ) | — |  | — |  | 250.8 |
Equity in earnings of unconsolidated affiliates (A) | — |  | (71.9 | ) | — |  | — |  | (71.9 | )
Other income (expense) | 6.6 |  | — |  | (0.7 | ) | (0.1 | ) | 5.8 |
Interest expense | 36.4 |  | — |  | 0.7 |  | (0.1 | ) | 37.0 |
Income tax expense | 63.0 |  | (26.8 | ) | 0.3 |  | — |  | 36.5 |
Net income (loss) | $ | 162.9 |  | $ | (50.0 | ) | $ | (1.7 | ) | $ | — |  | $ | 111.2 |
Investment in unconsolidated affiliates | $ | — |  | $ | 1,202.2 |  | $ | — |  | $ | — |  | $ | 1,202.2 |
Total assets | $ | 8,570.7 |  | $ | 1,541.5 |  | $ | 134.0 |  | $ | (628.4 | ) | $ | 9,617.8 |
Three Months Ended September 30, 2014 | Electric Utility | Natural Gas Midstream Operations | Other Operations | Eliminations | Total
(In millions) |  |  |  |  |
Operating revenues | $ | 754.7 |  | $ | — |  | $ | — |  | $ | — |  | $ | 754.7 |
Cost of sales | 305.3 |  | — |  | — |  | — |  | 305.3 |
Other operation and maintenance | 111.0 |  | 0.3 |  | (3.2 | ) | — |  | 108.1 |
Depreciation and amortization | 69.4 |  | — |  | 2.3 |  | — |  | 71.7 |
Taxes other than income | 20.6 |  | — |  | 0.9 |  | — |  | 21.5 |
Operating income (loss) | 248.4 |  | (0.3 | ) | — |  | — |  | 248.1 |
Equity in earnings of unconsolidated affiliates (A) | — |  | 44.7 |  | — |  | — |  | 44.7 |
Other income (expense) | 2.9 |  | — |  | (0.3 | ) | (0.1 | ) | 2.5 |
Interest expense | 35.3 |  | — |  | 2.0 |  | (0.1 | ) | 37.2 |
Income tax expense | 58.7 |  | 16.2 |  | (4.1 | ) | — |  | 70.8 |
Net income (loss) | $ | 157.3 |  | $ | 28.2 |  | $ | 1.8 |  | $ | — |  | $ | 187.3 |
Investment in unconsolidated affiliates | $ | — |  | $ | 1,311.1 |  | $ | — |  | $ | — |  | $ | 1,311.1 |
Total assets | $ | 8,003.1 |  | $ | 1,427.2 |  | $ | 204.1 |  | $ | (171.7 | ) | $ | 9,462.7 |
(A) | The Company recorded a $108.4 million pre-tax charge during the three months ended September 30, 2015 for its share of Enable's goodwill impairment, as adjusted for the basis differences. See Note 3 for further discussion of Enable's goodwill impairment.
Nine Months Ended September 30, 2015 | Electric Utility | Natural Gas Midstream Operations | Other Operations | Eliminations | Total
(In millions) |  |  |  |  |
Operating revenues | $ | 1,749.8 |  | $ | — |  | $ | — |  | $ | — |  | $ | 1,749.8 |
Cost of sales | 682.3 |  | — |  | — |  | — |  | 682.3 |
Other operation and maintenance | 337.3 |  | 5.9 |  | (8.9 | ) | — |  | 334.3 |
Depreciation and amortization | 224.0 |  | — |  | 6.0 |  | — |  | 230.0 |
Taxes other than income | 65.7 |  | — |  | 3.1 |  | — |  | 68.8 |
Operating income (loss) | 440.5 |  | (5.9 | ) | (0.2 | ) | — |  | 434.4 |
Equity in earnings of unconsolidated affiliates (A) | — |  | (12.0 | ) | — |  | — |  | (12.0 | )
Other income (expense) | 13.9 |  | — |  | 2.6 |  | (0.2 | ) | 16.3 |
Interest expense | 110.5 |  | — |  | 2.1 |  | (0.2 | ) | 112.4 |
Income tax expense | 94.9 |  | (8.7 | ) | (1.8 | ) | — |  | 84.4 |
Net income (loss) | $ | 249.0 |  | $ | (9.2 | ) | $ | 2.1 |  | $ | — |  | $ | 241.9 |
Investment in unconsolidated affiliates | $ | — |  | $ | 1,202.2 |  | $ | — |  | $ | — |  | $ | 1,202.2 |
Total assets | $ | 8,570.7 |  | $ | 1,541.5 |  | $ | 134.0 |  | $ | (628.4 | ) | $ | 9,617.8 |
Nine Months Ended September 30, 2014 | Electric Utility | Natural Gas Midstream Operations | Other Operations | Eliminations | Total
(In millions) |  |  |  |  |
Operating revenues | $ | 1,926.9 |  | $ | — |  | $ | — |  | $ | — |  | $ | 1,926.9 |
Cost of sales | 869.6 |  | — |  | — |  | — |  | 869.6 |
Other operation and maintenance | 343.1 |  | 0.7 |  | (11.9 | ) | — |  | 331.9 |
Depreciation and amortization | 198.7 |  | — |  | 8.5 |  | — |  | 207.2 |
Taxes other than income | 63.1 |  | — |  | 3.4 |  | — |  | 66.5 |
Operating income (loss) | 452.4 |  | (0.7 | ) | — |  | — |  | 451.7 |
Equity in earnings of unconsolidated affiliates (A) | — |  | 131.9 |  | — |  | — |  | 131.9 |
Other income (expense) | 4.5 |  | — |  | (0.8 | ) | (0.2 | ) | 3.5 |
Interest expense | 106.7 |  | — |  | 6.0 |  | (0.2 | ) | 112.5 |
Income tax expense | 95.3 |  | 49.6 |  | (7.7 | ) | — |  | 137.2 |
Net income (loss) | $ | 254.9 |  | $ | 81.6 |  | $ | 0.9 |  | $ | — |  | $ | 337.4 |
Investment in unconsolidated affiliates | $ | — |  | $ | 1,311.1 |  | $ | — |  | $ | — |  | $ | 1,311.1 |
Total assets | $ | 8,003.1 |  | $ | 1,427.2 |  | $ | 204.1 |  | $ | (171.7 | ) | $ | 9,462.7 |
(A) | The Company recorded a $108.4 million pre-tax charge during the nine months ended September 30, 2015 for its share of Enable's goodwill impairment, as adjusted for the basis differences. See Note 3 of this Form 10-Q for further discussion of Enable's goodwill impairment.

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8736-108599 + Details
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