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Report of Business Segments | 9 Months Ended
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Sep. 30, 2015
Segment Reporting [Abstract] |
Report of Business Segments | Report of Business Segments The Company reports its operations in two business segments: (i) the electric utility segment, which is engaged in the generation, transmission, distribution and sale of electric energy, and (ii) the natural gas midstream operations segment. Intersegment revenues are recorded at prices comparable to those of unaffiliated customers and are affected by regulatory considerations. The following tables summarize the results of the Company's business segments during the three and nine months ended September 30, 2016 and 2015.
Three Months Ended September 30, 2016 | Electric Utility | Natural Gas Midstream Operations | Other Operations | Eliminations | Total
(In millions) |  |  |  |  |
Operating revenues | $ | 743.9 |  | $ | — |  | $ | — |  | $ | — |  | $ | 743.9 |
Cost of sales | 269.8 |  | — |  | — |  | — |  | 269.8 |
Other operation and maintenance | 115.2 |  | (0.1 | ) | (2.0 | ) | — |  | 113.1 |
Depreciation and amortization | 80.8 |  | — |  | 1.4 |  | — |  | 82.2 |
Taxes other than income | 20.9 |  | — |  | 0.6 |  | — |  | 21.5 |
Operating income | 257.2 |  | 0.1 |  | — |  | — |  | 257.3 |
Equity in earnings of unconsolidated affiliates | — |  | 34.5 |  | — |  | — |  | 34.5 |
Other income | 6.0 |  | — |  | 0.3 |  | — |  | 6.3 |
Interest expense | 34.3 |  | — |  | 1.1 |  | — |  | 35.4 |
Income tax expense (benefit) | 69.0 |  | 12.1 |  | (2.0 | ) | — |  | 79.1 |
Net income | $ | 159.9 |  | $ | 22.5 |  | $ | 1.2 |  | $ | — |  | $ | 183.6 |
Investment in unconsolidated affiliates | $ | — |  | $ | 1,168.0 |  | $ | — |  | $ | — |  | $ | 1,168.0 |
Total assets | $ | 8,511.5 |  | $ | 1,503.1 |  | $ | 93.3 |  | $ | (323.9 | ) | $ | 9,784.0 |
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 | 255.7 |  | (4.9 | ) | — |  | — |  | 250.8 |
Equity in earnings of unconsolidated affiliates (A) | — |  | (71.9 | ) | — |  | — |  | (71.9 | )
Other income | 6.6 |  | — |  | (0.7 | ) | (0.1 | ) | 5.8 |
Interest expense | 36.4 |  | — |  | 0.7 |  | (0.1 | ) | 37.0 |
Income tax expense (benefit) | 63.0 |  | (26.8 | ) | 0.3 |  | — |  | 36.5 |
Net income | $ | 162.9 |  | $ | (50.0 | ) | $ | (1.7 | ) | $ | — |  | $ | 111.2 |
Investment in unconsolidated affiliates | $ | — |  | $ | 1,202.2 |  | $ | — |  | $ | — |  | $ | 1,202.2 |
Total assets | $ | 8,554.1 |  | $ | 1,541.5 |  | $ | 133.5 |  | $ | (628.4 | ) | $ | 9,600.7 |
(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.
Nine Months Ended September 30, 2016 | Electric Utility | Natural Gas Midstream Operations | Other Operations | Eliminations | Total
(In millions) |  |  |  |  |
Operating revenues | $ | 1,728.4 |  | $ | — |  | $ | — |  | $ | — |  | $ | 1,728.4 |
Cost of sales | 645.4 |  | — |  | — |  | — |  | 645.4 |
Other operation and maintenance | 356.3 |  | 7.9 |  | (9.6 | ) | — |  | 354.6 |
Depreciation and amortization | 235.9 |  | — |  | 4.9 |  | — |  | 240.8 |
Taxes other than income | 63.6 |  | — |  | 2.9 |  | — |  | 66.5 |
Operating income | 427.2 |  | (7.9 | ) | 1.8 |  | — |  | 421.1 |
Equity in earnings of unconsolidated affiliates | — |  | 79.5 |  | — |  | — |  | 79.5 |
Other income | 18.3 |  | — |  | (0.8 | ) | (0.2 | ) | 17.3 |
Interest expense | 104.8 |  | — |  | 3.1 |  | (0.2 | ) | 107.7 |
Income tax expense (benefit) | 102.4 |  | 31.5 |  | (4.0 | ) | — |  | 129.9 |
Net income | $ | 238.3 |  | $ | 40.1 |  | $ | 1.9 |  | $ | — |  | $ | 280.3 |
Investment in unconsolidated affiliates | $ | — |  | $ | 1,168.0 |  | $ | — |  | $ | — |  | $ | 1,168.0 |
Total assets | $ | 8,511.5 |  | $ | 1,503.1 |  | $ | 93.3 |  | $ | (323.9 | ) | $ | 9,784.0 |
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 | 440.5 |  | (5.9 | ) | (0.2 | ) | — |  | 434.4 |
Equity in earnings of unconsolidated affiliates (A) | — |  | (12.0 | ) | — |  | — |  | (12.0 | )
Other income | 13.9 |  | — |  | 2.6 |  | (0.2 | ) | 16.3 |
Interest expense | 110.5 |  | — |  | 2.1 |  | (0.2 | ) | 112.4 |
Income tax expense (benefit) | 94.9 |  | (8.7 | ) | (1.8 | ) | — |  | 84.4 |
Net income | $ | 249.0 |  | $ | (9.2 | ) | $ | 2.1 |  | $ | — |  | $ | 241.9 |
Investment in unconsolidated affiliates | $ | — |  | $ | 1,202.2 |  | $ | — |  | $ | — |  | $ | 1,202.2 |
Total assets | $ | 8,554.1 |  | $ | 1,541.5 |  | $ | 133.5 |  | $ | (628.4 | ) | $ | 9,600.7 |
(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.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8981-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8971-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8595-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8380-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8984-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8538-108599 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8864-108599 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8924-108599 Reference 14: 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=68060357&loc=d3e8906-108599 + Details
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