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Segments Of Business | 3 Months Ended
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Mar. 31, 2017
Segment Reporting Information [Line Items] |
Segments Of Business | SEGMENTS OF BUSINESS Alliant Energy - Certain financial information relating to Alliant Energy’s business segments is as follows. Intersegment revenues were not material to Alliant Energy’s operations.
| Utility (a) |  | Non-Regulated, |  | Alliant Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Three Months Ended March 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $677.6 |  |  |  | $154.3 |  |  |  | $11.7 |  |  |  | $843.6 |  |  |  | $10.3 |  |  |  | $853.9 |
Operating income | 107.2 |  |  | 28.0 |  |  | 0.4 |  |  | 135.6 |  |  | 7.3 |  |  | 142.9 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 89.6 |  |  | 9.4 |  |  | 99.0 |
Income from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | 1.4 |  |  | 1.4 |
Net income |  |  |  |  |  |  | 89.6 |  |  | 10.8 |  |  | 100.4 |
Three Months Ended March 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $668.9 |  |  |  | $152.2 |  |  |  | $13.2 |  |  |  | $834.3 |  |  |  | $9.5 |  |  |  | $843.8 |
Operating income | 109.8 |  |  | 28.8 |  |  | 2.2 |  |  | 140.8 |  |  | 5.1 |  |  | 145.9 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 92.1 |  |  | 5.5 |  |  | 97.6 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (1.1 | ) |  | (1.1 | )
Net income |  |  |  |  |  |  | 92.1 |  |  | 4.4 |  |  | 96.5 |
(a) | Alliant Energy’s utility business segments include: a) utility electric operations, which include Alliant Energy’s entire investment in ATC; b) utility gas operations; and c) utility other, which includes steam operations and the unallocated portions of the utility business.
IPL - Certain financial information relating to IPL’s business segments is as follows. Intersegment revenues were not material to IPL’s operations.
| Electric |  | Gas |  | Other |  | Total
| (in millions)
Three Months Ended March 31, 2017 |  |  |  |  |  |  |
Operating revenues |  | $356.2 |  |  |  | $83.1 |  |  |  | $11.2 |  |  |  | $450.5 |
Operating income | 33.8 |  |  | 14.4 |  |  | 1.4 |  |  | 49.6 |
Earnings available for common stock |  |  |  |  |  |  | 37.2 |
Three Months Ended March 31, 2016 |  |  |  |  |  |  |
Operating revenues |  | $361.6 |  |  |  | $84.2 |  |  |  | $12.9 |  |  |  | $458.7 |
Operating income | 43.4 |  |  | 15.8 |  |  | 2.8 |  |  | 62.0 |
Earnings available for common stock |  |  |  |  |  |  | 45.6 |
WPL - Certain financial information relating to WPL’s business segments is as follows. Intersegment revenues were not material to WPL’s operations.
| Electric |  | Gas |  | Other |  | Total
| (in millions)
Three Months Ended March 31, 2017 |  |  |  |  |  |  |
Operating revenues |  | $321.4 |  |  |  | $71.2 |  |  |  | $0.5 |  |  |  | $393.1 |
Operating income (loss) | 73.4 |  |  | 13.6 |  |  | (1.0 | ) |  | 86.0 |
Earnings available for common stock |  |  |  |  |  |  | 45.5 |
Three Months Ended March 31, 2016 |  |  |  |  |  |  |
Operating revenues |  | $307.3 |  |  |  | $68.0 |  |  |  | $0.3 |  |  |  | $375.6 |
Operating income (loss) | 66.4 |  |  | 13.0 |  |  | (0.6 | ) |  | 78.8 |
Earnings available for common stock |  |  |  |  |  |  | 46.5 |
IPL [Member] |
Segment Reporting Information [Line Items] |
Segments Of Business | SEGMENTS OF BUSINESS Alliant Energy - Certain financial information relating to Alliant Energy’s business segments is as follows. Intersegment revenues were not material to Alliant Energy’s operations.
| Utility (a) |  | Non-Regulated, |  | Alliant Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Three Months Ended March 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $677.6 |  |  |  | $154.3 |  |  |  | $11.7 |  |  |  | $843.6 |  |  |  | $10.3 |  |  |  | $853.9 |
Operating income | 107.2 |  |  | 28.0 |  |  | 0.4 |  |  | 135.6 |  |  | 7.3 |  |  | 142.9 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 89.6 |  |  | 9.4 |  |  | 99.0 |
Income from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | 1.4 |  |  | 1.4 |
Net income |  |  |  |  |  |  | 89.6 |  |  | 10.8 |  |  | 100.4 |
Three Months Ended March 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $668.9 |  |  |  | $152.2 |  |  |  | $13.2 |  |  |  | $834.3 |  |  |  | $9.5 |  |  |  | $843.8 |
Operating income | 109.8 |  |  | 28.8 |  |  | 2.2 |  |  | 140.8 |  |  | 5.1 |  |  | 145.9 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 92.1 |  |  | 5.5 |  |  | 97.6 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (1.1 | ) |  | (1.1 | )
Net income |  |  |  |  |  |  | 92.1 |  |  | 4.4 |  |  | 96.5 |
(a) | Alliant Energy’s utility business segments include: a) utility electric operations, which include Alliant Energy’s entire investment in ATC; b) utility gas operations; and c) utility other, which includes steam operations and the unallocated portions of the utility business.
IPL - Certain financial information relating to IPL’s business segments is as follows. Intersegment revenues were not material to IPL’s operations.
| Electric |  | Gas |  | Other |  | Total
| (in millions)
Three Months Ended March 31, 2017 |  |  |  |  |  |  |
Operating revenues |  | $356.2 |  |  |  | $83.1 |  |  |  | $11.2 |  |  |  | $450.5 |
Operating income | 33.8 |  |  | 14.4 |  |  | 1.4 |  |  | 49.6 |
Earnings available for common stock |  |  |  |  |  |  | 37.2 |
Three Months Ended March 31, 2016 |  |  |  |  |  |  |
Operating revenues |  | $361.6 |  |  |  | $84.2 |  |  |  | $12.9 |  |  |  | $458.7 |
Operating income | 43.4 |  |  | 15.8 |  |  | 2.8 |  |  | 62.0 |
Earnings available for common stock |  |  |  |  |  |  | 45.6 |
WPL - Certain financial information relating to WPL’s business segments is as follows. Intersegment revenues were not material to WPL’s operations.
| Electric |  | Gas |  | Other |  | Total
| (in millions)
Three Months Ended March 31, 2017 |  |  |  |  |  |  |
Operating revenues |  | $321.4 |  |  |  | $71.2 |  |  |  | $0.5 |  |  |  | $393.1 |
Operating income (loss) | 73.4 |  |  | 13.6 |  |  | (1.0 | ) |  | 86.0 |
Earnings available for common stock |  |  |  |  |  |  | 45.5 |
Three Months Ended March 31, 2016 |  |  |  |  |  |  |
Operating revenues |  | $307.3 |  |  |  | $68.0 |  |  |  | $0.3 |  |  |  | $375.6 |
Operating income (loss) | 66.4 |  |  | 13.0 |  |  | (0.6 | ) |  | 78.8 |
Earnings available for common stock |  |  |  |  |  |  | 46.5 |
WPL [Member] |
Segment Reporting Information [Line Items] |
Segments Of Business | SEGMENTS OF BUSINESS Alliant Energy - Certain financial information relating to Alliant Energy’s business segments is as follows. Intersegment revenues were not material to Alliant Energy’s operations.
| Utility (a) |  | Non-Regulated, |  | Alliant Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Three Months Ended March 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $677.6 |  |  |  | $154.3 |  |  |  | $11.7 |  |  |  | $843.6 |  |  |  | $10.3 |  |  |  | $853.9 |
Operating income | 107.2 |  |  | 28.0 |  |  | 0.4 |  |  | 135.6 |  |  | 7.3 |  |  | 142.9 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 89.6 |  |  | 9.4 |  |  | 99.0 |
Income from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | 1.4 |  |  | 1.4 |
Net income |  |  |  |  |  |  | 89.6 |  |  | 10.8 |  |  | 100.4 |
Three Months Ended March 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $668.9 |  |  |  | $152.2 |  |  |  | $13.2 |  |  |  | $834.3 |  |  |  | $9.5 |  |  |  | $843.8 |
Operating income | 109.8 |  |  | 28.8 |  |  | 2.2 |  |  | 140.8 |  |  | 5.1 |  |  | 145.9 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 92.1 |  |  | 5.5 |  |  | 97.6 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (1.1 | ) |  | (1.1 | )
Net income |  |  |  |  |  |  | 92.1 |  |  | 4.4 |  |  | 96.5 |
(a) | Alliant Energy’s utility business segments include: a) utility electric operations, which include Alliant Energy’s entire investment in ATC; b) utility gas operations; and c) utility other, which includes steam operations and the unallocated portions of the utility business.
IPL - Certain financial information relating to IPL’s business segments is as follows. Intersegment revenues were not material to IPL’s operations.
| Electric |  | Gas |  | Other |  | Total
| (in millions)
Three Months Ended March 31, 2017 |  |  |  |  |  |  |
Operating revenues |  | $356.2 |  |  |  | $83.1 |  |  |  | $11.2 |  |  |  | $450.5 |
Operating income | 33.8 |  |  | 14.4 |  |  | 1.4 |  |  | 49.6 |
Earnings available for common stock |  |  |  |  |  |  | 37.2 |
Three Months Ended March 31, 2016 |  |  |  |  |  |  |
Operating revenues |  | $361.6 |  |  |  | $84.2 |  |  |  | $12.9 |  |  |  | $458.7 |
Operating income | 43.4 |  |  | 15.8 |  |  | 2.8 |  |  | 62.0 |
Earnings available for common stock |  |  |  |  |  |  | 45.6 |
WPL - Certain financial information relating to WPL’s business segments is as follows. Intersegment revenues were not material to WPL’s operations.
| Electric |  | Gas |  | Other |  | Total
| (in millions)
Three Months Ended March 31, 2017 |  |  |  |  |  |  |
Operating revenues |  | $321.4 |  |  |  | $71.2 |  |  |  | $0.5 |  |  |  | $393.1 |
Operating income (loss) | 73.4 |  |  | 13.6 |  |  | (1.0 | ) |  | 86.0 |
Earnings available for common stock |  |  |  |  |  |  | 45.5 |
Three Months Ended March 31, 2016 |  |  |  |  |  |  |
Operating revenues |  | $307.3 |  |  |  | $68.0 |  |  |  | $0.3 |  |  |  | $375.6 |
Operating income (loss) | 66.4 |  |  | 13.0 |  |  | (0.6 | ) |  | 78.8 |
Earnings available for common stock |  |  |  |  |  |  | 46.5 |

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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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