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Selected Consolidated Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2015
Selected Consolidated Quarterly Financial Data (Unaudited) | SELECTED CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED) Alliant Energy - All “per share” references refer to earnings per diluted share. Summation of the individual quarters may not equal annual totals due to rounding. Refer to Note 19 for additional information on discontinued operations.
| 2015 |  | 2014
| March 31 |  | June 30 |  | Sep. 30 |  | Dec. 31 |  | March 31 |  | June 30 |  | Sep. 30 |  | Dec. 31
| (in millions, except per share data)
Operating revenues |  | $897.4 |  |  |  | $717.2 |  |  |  | $898.9 |  |  |  | $740.1 |  |  |  | $952.8 |  |  |  | $750.3 |  |  |  | $843.1 |  |  |  | $804.1 |
Operating income | 152.9 |  |  | 109.0 |  |  | 235.9 |  |  | 79.2 |  |  | 154.2 |  |  | 103.3 |  |  | 194.8 |  |  | 91.3 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax | 96.6 |  |  | 68.9 |  |  | 180.0 |  |  | 35.2 |  |  | 108.0 |  |  | 62.1 |  |  | 155.2 |  |  | 60.2 |
Loss from discontinued operations, net of tax | — |  |  | (1.3 | ) |  | (0.1 | ) |  | (1.1 | ) |  | — |  |  | (0.3 | ) |  | (1.9 | ) |  | (0.2 | )
Net income | 96.6 |  |  | 67.6 |  |  | 179.9 |  |  | 34.1 |  |  | 108.0 |  |  | 61.8 |  |  | 153.3 |  |  | 60.0 |
Earnings per weighted average common share attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax | 0.87 |  |  | 0.61 |  |  | 1.59 |  |  | 0.31 |  |  | 0.97 |  |  | 0.56 |  |  | 1.40 |  |  | 0.54 |
Loss from discontinued operations, net of tax | — |  |  | (0.01 | ) |  | — |  |  | (0.01 | ) |  | — |  |  | — |  |  | (0.02 | ) |  | — |
Net income | 0.87 |  |  | 0.60 |  |  | 1.59 |  |  | 0.30 |  |  | 0.97 |  |  | 0.56 |  |  | 1.38 |  |  | 0.54 |
IPL - Earnings per share data is not disclosed for IPL given Alliant Energy is the sole shareowner of all shares of IPL’s common stock outstanding during the periods presented. Refer to Note 1(q) for discussion of IPL’s previously reported Selected Consolidated Quarterly Financial Data (Unaudited), which was impacted as a result of a change to IPL’s method of recording income taxes retrospectively adopted in the fourth quarter of 2015.
| 2015 |  | 2014
| March 31 |  | June 30 |  | Sep. 30 |  | Dec. 31 |  | March 31 |  | June 30 |  | Sep. 30 |  | Dec. 31
| (in millions)
Operating revenues |  | $489.0 |  |  |  | $382.2 |  |  |  | $504.6 |  |  |  | $398.7 |  |  |  | $528.9 |  |  |  | $411.9 |  |  |  | $476.2 |  |  |  | $431.1 |
Operating income | 65.5 |  |  | 33.8 |  |  | 117.0 |  |  | 25.6 |  |  | 57.5 |  |  | 34.0 |  |  | 93.9 |  |  | 23.8 |
Net income | 50.1 |  |  | 19.0 |  |  | 119.1 |  |  | 8.0 |  |  | 45.3 |  |  | 20.5 |  |  | 104.6 |  |  | 21.4 |
Earnings available for common stock | 47.5 |  |  | 16.5 |  |  | 116.5 |  |  | 5.5 |  |  | 42.7 |  |  | 18.0 |  |  | 102.0 |  |  | 18.9 |
WPL - Earnings per share data is not disclosed for WPL given Alliant Energy is the sole shareowner of all shares of WPL’s common stock outstanding during the periods presented. Refer to Note 1(q) for discussion of WPL’s previously reported Selected Consolidated Quarterly Financial Data (Unaudited), which was impacted as a result of a change to WPL’s method of recording income taxes retrospectively adopted in the fourth quarter of 2015.
| 2015 |  | 2014
| March 31 |  | June 30 |  | Sep. 30 |  | Dec. 31 |  | March 31 |  | June 30 |  | Sep. 30 |  | Dec. 31
| (in millions)
Operating revenues |  | $397.1 |  |  |  | $324.7 |  |  |  | $382.6 |  |  |  | $330.7 |  |  |  | $410.4 |  |  |  | $324.5 |  |  |  | $354.4 |  |  |  | $359.8 |
Operating income | 80.8 |  |  | 68.3 |  |  | 110.3 |  |  | 49.3 |  |  | 87.7 |  |  | 60.0 |  |  | 93.9 |  |  | 59.4 |
Net income | 45.1 |  |  | 39.7 |  |  | 68.4 |  |  | 24.4 |  |  | 55.2 |  |  | 34.7 |  |  | 57.9 |  |  | 33.3 |
Earnings available for common stock | 44.9 |  |  | 39.2 |  |  | 68.0 |  |  | 24.2 |  |  | 55.2 |  |  | 34.7 |  |  | 57.9 |  |  | 32.6 |
IPL [Member] |
Selected Consolidated Quarterly Financial Data (Unaudited) | SELECTED CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED) Alliant Energy - All “per share” references refer to earnings per diluted share. Summation of the individual quarters may not equal annual totals due to rounding. Refer to Note 19 for additional information on discontinued operations.
| 2015 |  | 2014
| March 31 |  | June 30 |  | Sep. 30 |  | Dec. 31 |  | March 31 |  | June 30 |  | Sep. 30 |  | Dec. 31
| (in millions, except per share data)
Operating revenues |  | $897.4 |  |  |  | $717.2 |  |  |  | $898.9 |  |  |  | $740.1 |  |  |  | $952.8 |  |  |  | $750.3 |  |  |  | $843.1 |  |  |  | $804.1 |
Operating income | 152.9 |  |  | 109.0 |  |  | 235.9 |  |  | 79.2 |  |  | 154.2 |  |  | 103.3 |  |  | 194.8 |  |  | 91.3 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax | 96.6 |  |  | 68.9 |  |  | 180.0 |  |  | 35.2 |  |  | 108.0 |  |  | 62.1 |  |  | 155.2 |  |  | 60.2 |
Loss from discontinued operations, net of tax | — |  |  | (1.3 | ) |  | (0.1 | ) |  | (1.1 | ) |  | — |  |  | (0.3 | ) |  | (1.9 | ) |  | (0.2 | )
Net income | 96.6 |  |  | 67.6 |  |  | 179.9 |  |  | 34.1 |  |  | 108.0 |  |  | 61.8 |  |  | 153.3 |  |  | 60.0 |
Earnings per weighted average common share attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax | 0.87 |  |  | 0.61 |  |  | 1.59 |  |  | 0.31 |  |  | 0.97 |  |  | 0.56 |  |  | 1.40 |  |  | 0.54 |
Loss from discontinued operations, net of tax | — |  |  | (0.01 | ) |  | — |  |  | (0.01 | ) |  | — |  |  | — |  |  | (0.02 | ) |  | — |
Net income | 0.87 |  |  | 0.60 |  |  | 1.59 |  |  | 0.30 |  |  | 0.97 |  |  | 0.56 |  |  | 1.38 |  |  | 0.54 |
IPL - Earnings per share data is not disclosed for IPL given Alliant Energy is the sole shareowner of all shares of IPL’s common stock outstanding during the periods presented. Refer to Note 1(q) for discussion of IPL’s previously reported Selected Consolidated Quarterly Financial Data (Unaudited), which was impacted as a result of a change to IPL’s method of recording income taxes retrospectively adopted in the fourth quarter of 2015.
| 2015 |  | 2014
| March 31 |  | June 30 |  | Sep. 30 |  | Dec. 31 |  | March 31 |  | June 30 |  | Sep. 30 |  | Dec. 31
| (in millions)
Operating revenues |  | $489.0 |  |  |  | $382.2 |  |  |  | $504.6 |  |  |  | $398.7 |  |  |  | $528.9 |  |  |  | $411.9 |  |  |  | $476.2 |  |  |  | $431.1 |
Operating income | 65.5 |  |  | 33.8 |  |  | 117.0 |  |  | 25.6 |  |  | 57.5 |  |  | 34.0 |  |  | 93.9 |  |  | 23.8 |
Net income | 50.1 |  |  | 19.0 |  |  | 119.1 |  |  | 8.0 |  |  | 45.3 |  |  | 20.5 |  |  | 104.6 |  |  | 21.4 |
Earnings available for common stock | 47.5 |  |  | 16.5 |  |  | 116.5 |  |  | 5.5 |  |  | 42.7 |  |  | 18.0 |  |  | 102.0 |  |  | 18.9 |
WPL - Earnings per share data is not disclosed for WPL given Alliant Energy is the sole shareowner of all shares of WPL’s common stock outstanding during the periods presented. Refer to Note 1(q) for discussion of WPL’s previously reported Selected Consolidated Quarterly Financial Data (Unaudited), which was impacted as a result of a change to WPL’s method of recording income taxes retrospectively adopted in the fourth quarter of 2015.
| 2015 |  | 2014
| March 31 |  | June 30 |  | Sep. 30 |  | Dec. 31 |  | March 31 |  | June 30 |  | Sep. 30 |  | Dec. 31
| (in millions)
Operating revenues |  | $397.1 |  |  |  | $324.7 |  |  |  | $382.6 |  |  |  | $330.7 |  |  |  | $410.4 |  |  |  | $324.5 |  |  |  | $354.4 |  |  |  | $359.8 |
Operating income | 80.8 |  |  | 68.3 |  |  | 110.3 |  |  | 49.3 |  |  | 87.7 |  |  | 60.0 |  |  | 93.9 |  |  | 59.4 |
Net income | 45.1 |  |  | 39.7 |  |  | 68.4 |  |  | 24.4 |  |  | 55.2 |  |  | 34.7 |  |  | 57.9 |  |  | 33.3 |
Earnings available for common stock | 44.9 |  |  | 39.2 |  |  | 68.0 |  |  | 24.2 |  |  | 55.2 |  |  | 34.7 |  |  | 57.9 |  |  | 32.6 |
WPL [Member] |
Selected Consolidated Quarterly Financial Data (Unaudited) | SELECTED CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED) Alliant Energy - All “per share” references refer to earnings per diluted share. Summation of the individual quarters may not equal annual totals due to rounding. Refer to Note 19 for additional information on discontinued operations.
| 2015 |  | 2014
| March 31 |  | June 30 |  | Sep. 30 |  | Dec. 31 |  | March 31 |  | June 30 |  | Sep. 30 |  | Dec. 31
| (in millions, except per share data)
Operating revenues |  | $897.4 |  |  |  | $717.2 |  |  |  | $898.9 |  |  |  | $740.1 |  |  |  | $952.8 |  |  |  | $750.3 |  |  |  | $843.1 |  |  |  | $804.1 |
Operating income | 152.9 |  |  | 109.0 |  |  | 235.9 |  |  | 79.2 |  |  | 154.2 |  |  | 103.3 |  |  | 194.8 |  |  | 91.3 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax | 96.6 |  |  | 68.9 |  |  | 180.0 |  |  | 35.2 |  |  | 108.0 |  |  | 62.1 |  |  | 155.2 |  |  | 60.2 |
Loss from discontinued operations, net of tax | — |  |  | (1.3 | ) |  | (0.1 | ) |  | (1.1 | ) |  | — |  |  | (0.3 | ) |  | (1.9 | ) |  | (0.2 | )
Net income | 96.6 |  |  | 67.6 |  |  | 179.9 |  |  | 34.1 |  |  | 108.0 |  |  | 61.8 |  |  | 153.3 |  |  | 60.0 |
Earnings per weighted average common share attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax | 0.87 |  |  | 0.61 |  |  | 1.59 |  |  | 0.31 |  |  | 0.97 |  |  | 0.56 |  |  | 1.40 |  |  | 0.54 |
Loss from discontinued operations, net of tax | — |  |  | (0.01 | ) |  | — |  |  | (0.01 | ) |  | — |  |  | — |  |  | (0.02 | ) |  | — |
Net income | 0.87 |  |  | 0.60 |  |  | 1.59 |  |  | 0.30 |  |  | 0.97 |  |  | 0.56 |  |  | 1.38 |  |  | 0.54 |
IPL - Earnings per share data is not disclosed for IPL given Alliant Energy is the sole shareowner of all shares of IPL’s common stock outstanding during the periods presented. Refer to Note 1(q) for discussion of IPL’s previously reported Selected Consolidated Quarterly Financial Data (Unaudited), which was impacted as a result of a change to IPL’s method of recording income taxes retrospectively adopted in the fourth quarter of 2015.
| 2015 |  | 2014
| March 31 |  | June 30 |  | Sep. 30 |  | Dec. 31 |  | March 31 |  | June 30 |  | Sep. 30 |  | Dec. 31
| (in millions)
Operating revenues |  | $489.0 |  |  |  | $382.2 |  |  |  | $504.6 |  |  |  | $398.7 |  |  |  | $528.9 |  |  |  | $411.9 |  |  |  | $476.2 |  |  |  | $431.1 |
Operating income | 65.5 |  |  | 33.8 |  |  | 117.0 |  |  | 25.6 |  |  | 57.5 |  |  | 34.0 |  |  | 93.9 |  |  | 23.8 |
Net income | 50.1 |  |  | 19.0 |  |  | 119.1 |  |  | 8.0 |  |  | 45.3 |  |  | 20.5 |  |  | 104.6 |  |  | 21.4 |
Earnings available for common stock | 47.5 |  |  | 16.5 |  |  | 116.5 |  |  | 5.5 |  |  | 42.7 |  |  | 18.0 |  |  | 102.0 |  |  | 18.9 |
WPL - Earnings per share data is not disclosed for WPL given Alliant Energy is the sole shareowner of all shares of WPL’s common stock outstanding during the periods presented. Refer to Note 1(q) for discussion of WPL’s previously reported Selected Consolidated Quarterly Financial Data (Unaudited), which was impacted as a result of a change to WPL’s method of recording income taxes retrospectively adopted in the fourth quarter of 2015.
| 2015 |  | 2014
| March 31 |  | June 30 |  | Sep. 30 |  | Dec. 31 |  | March 31 |  | June 30 |  | Sep. 30 |  | Dec. 31
| (in millions)
Operating revenues |  | $397.1 |  |  |  | $324.7 |  |  |  | $382.6 |  |  |  | $330.7 |  |  |  | $410.4 |  |  |  | $324.5 |  |  |  | $354.4 |  |  |  | $359.8 |
Operating income | 80.8 |  |  | 68.3 |  |  | 110.3 |  |  | 49.3 |  |  | 87.7 |  |  | 60.0 |  |  | 93.9 |  |  | 59.4 |
Net income | 45.1 |  |  | 39.7 |  |  | 68.4 |  |  | 24.4 |  |  | 55.2 |  |  | 34.7 |  |  | 57.9 |  |  | 33.3 |
Earnings available for common stock | 44.9 |  |  | 39.2 |  |  | 68.0 |  |  | 24.2 |  |  | 55.2 |  |  | 34.7 |  |  | 57.9 |  |  | 32.6 |

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=35737889&loc=d3e1280-108306 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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