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Segments Of Business | 6 Months Ended
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Jun. 30, 2015
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 |  | Non-Regulated, |  | Alliant Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Three Months Ended June 30, 2015 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $640.4 |  |  |  | $51.7 |  |  |  | $14.8 |  |  |  | $706.9 |  |  |  | $10.3 |  |  |  | $717.2 |
Operating income (loss) | 100.9 |  |  | (2.0 | ) |  | 3.2 |  |  | 102.1 |  |  | 6.9 |  |  | 109.0 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 55.7 |  |  | 13.2 |  |  | 68.9 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (1.3 | ) |  | (1.3 | )
Net income |  |  |  |  |  |  | 55.7 |  |  | 11.9 |  |  | 67.6 |
Three Months Ended June 30, 2014 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $643.9 |  |  |  | $76.9 |  |  |  | $15.6 |  |  |  | $736.4 |  |  |  | $13.9 |  |  |  | $750.3 |
Operating income | 89.1 |  |  | 2.7 |  |  | 2.2 |  |  | 94.0 |  |  | 9.3 |  |  | 103.3 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 53.0 |  |  | 9.1 |  |  | 62.1 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (0.3 | ) |  | (0.3 | )
Net income |  |  |  |  |  |  | 53.0 |  |  | 8.8 |  |  | 61.8 |
| Utility |  | Non-Regulated, |  | Alliant Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Six Months Ended June 30, 2015 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $1,311.7 |  |  |  | $250.1 |  |  |  | $31.2 |  |  |  | $1,593.0 |  |  |  | $21.6 |  |  |  | $1,614.6 |
Operating income | 205.6 |  |  | 34.3 |  |  | 8.5 |  |  | 248.4 |  |  | 13.5 |  |  | 261.9 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 148.1 |  |  | 17.4 |  |  | 165.5 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (1.3 | ) |  | (1.3 | )
Net income |  |  |  |  |  |  | 148.1 |  |  | 16.1 |  |  | 164.2 |
Six Months Ended June 30, 2014 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $1,319.7 |  |  |  | $317.6 |  |  |  | $38.4 |  |  |  | $1,675.7 |  |  |  | $27.4 |  |  |  | $1,703.1 |
Operating income | 183.4 |  |  | 45.7 |  |  | 10.1 |  |  | 239.2 |  |  | 18.3 |  |  | 257.5 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 151.2 |  |  | 18.9 |  |  | 170.1 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (0.3 | ) |  | (0.3 | )
Net income |  |  |  |  |  |  | 151.2 |  |  | 18.6 |  |  | 169.8 |
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 June 30, 2015 |  |  |  |  |  |  |
Operating revenues |  | $339.4 |  |  |  | $29.8 |  |  |  | $13.0 |  |  |  | $382.2 |
Operating income (loss) | 33.9 |  |  | (2.4 | ) |  | 2.3 |  |  | 33.8 |
Earnings available for common stock |  |  |  |  |  |  | 16.7 |
Three Months Ended June 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $354.6 |  |  |  | $43.7 |  |  |  | $13.6 |  |  |  | $411.9 |
Operating income | 29.0 |  |  | 1.6 |  |  | 3.4 |  |  | 34.0 |
Earnings available for common stock |  |  |  |  |  |  | 18.4 |
Six Months Ended June 30, 2015 |  |  |  |  |  |  |
Operating revenues |  | $702.0 |  |  |  | $141.0 |  |  |  | $28.2 |  |  |  | $871.2 |
Operating income | 74.2 |  |  | 18.2 |  |  | 6.9 |  |  | 99.3 |
Earnings available for common stock |  |  |  |  |  |  | 64.5 |
Six Months Ended June 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $728.8 |  |  |  | $179.4 |  |  |  | $32.6 |  |  |  | $940.8 |
Operating income | 55.5 |  |  | 24.9 |  |  | 11.1 |  |  | 91.5 |
Earnings available for common stock |  |  |  |  |  |  | 61.8 |
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 June 30, 2015 |  |  |  |  |  |  |
Operating revenues |  | $301.0 |  |  |  | $21.9 |  |  |  | $1.8 |  |  |  | $324.7 |
Operating income | 67.0 |  |  | 0.4 |  |  | 0.9 |  |  | 68.3 |
Earnings available for common stock |  |  |  |  |  |  | 39.0 |
Three Months Ended June 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $289.3 |  |  |  | $33.2 |  |  |  | $2.0 |  |  |  | $324.5 |
Operating income (loss) | 60.1 |  |  | 1.1 |  |  | (1.2 | ) |  | 60.0 |
Earnings available for common stock |  |  |  |  |  |  | 34.6 |
Six Months Ended June 30, 2015 |  |  |  |  |  |  |
Operating revenues |  | $609.7 |  |  |  | $109.1 |  |  |  | $3.0 |  |  |  | $721.8 |
Operating income | 131.4 |  |  | 16.1 |  |  | 1.6 |  |  | 149.1 |
Earnings available for common stock |  |  |  |  |  |  | 83.6 |
Six Months Ended June 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $590.9 |  |  |  | $138.2 |  |  |  | $5.8 |  |  |  | $734.9 |
Operating income (loss) | 127.9 |  |  | 20.8 |  |  | (1.0 | ) |  | 147.7 |
Earnings available for common stock |  |  |  |  |  |  | 89.4 |
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 |  | Non-Regulated, |  | Alliant Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Three Months Ended June 30, 2015 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $640.4 |  |  |  | $51.7 |  |  |  | $14.8 |  |  |  | $706.9 |  |  |  | $10.3 |  |  |  | $717.2 |
Operating income (loss) | 100.9 |  |  | (2.0 | ) |  | 3.2 |  |  | 102.1 |  |  | 6.9 |  |  | 109.0 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 55.7 |  |  | 13.2 |  |  | 68.9 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (1.3 | ) |  | (1.3 | )
Net income |  |  |  |  |  |  | 55.7 |  |  | 11.9 |  |  | 67.6 |
Three Months Ended June 30, 2014 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $643.9 |  |  |  | $76.9 |  |  |  | $15.6 |  |  |  | $736.4 |  |  |  | $13.9 |  |  |  | $750.3 |
Operating income | 89.1 |  |  | 2.7 |  |  | 2.2 |  |  | 94.0 |  |  | 9.3 |  |  | 103.3 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 53.0 |  |  | 9.1 |  |  | 62.1 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (0.3 | ) |  | (0.3 | )
Net income |  |  |  |  |  |  | 53.0 |  |  | 8.8 |  |  | 61.8 |
| Utility |  | Non-Regulated, |  | Alliant Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Six Months Ended June 30, 2015 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $1,311.7 |  |  |  | $250.1 |  |  |  | $31.2 |  |  |  | $1,593.0 |  |  |  | $21.6 |  |  |  | $1,614.6 |
Operating income | 205.6 |  |  | 34.3 |  |  | 8.5 |  |  | 248.4 |  |  | 13.5 |  |  | 261.9 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 148.1 |  |  | 17.4 |  |  | 165.5 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (1.3 | ) |  | (1.3 | )
Net income |  |  |  |  |  |  | 148.1 |  |  | 16.1 |  |  | 164.2 |
Six Months Ended June 30, 2014 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $1,319.7 |  |  |  | $317.6 |  |  |  | $38.4 |  |  |  | $1,675.7 |  |  |  | $27.4 |  |  |  | $1,703.1 |
Operating income | 183.4 |  |  | 45.7 |  |  | 10.1 |  |  | 239.2 |  |  | 18.3 |  |  | 257.5 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 151.2 |  |  | 18.9 |  |  | 170.1 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (0.3 | ) |  | (0.3 | )
Net income |  |  |  |  |  |  | 151.2 |  |  | 18.6 |  |  | 169.8 |
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 June 30, 2015 |  |  |  |  |  |  |
Operating revenues |  | $339.4 |  |  |  | $29.8 |  |  |  | $13.0 |  |  |  | $382.2 |
Operating income (loss) | 33.9 |  |  | (2.4 | ) |  | 2.3 |  |  | 33.8 |
Earnings available for common stock |  |  |  |  |  |  | 16.7 |
Three Months Ended June 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $354.6 |  |  |  | $43.7 |  |  |  | $13.6 |  |  |  | $411.9 |
Operating income | 29.0 |  |  | 1.6 |  |  | 3.4 |  |  | 34.0 |
Earnings available for common stock |  |  |  |  |  |  | 18.4 |
Six Months Ended June 30, 2015 |  |  |  |  |  |  |
Operating revenues |  | $702.0 |  |  |  | $141.0 |  |  |  | $28.2 |  |  |  | $871.2 |
Operating income | 74.2 |  |  | 18.2 |  |  | 6.9 |  |  | 99.3 |
Earnings available for common stock |  |  |  |  |  |  | 64.5 |
Six Months Ended June 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $728.8 |  |  |  | $179.4 |  |  |  | $32.6 |  |  |  | $940.8 |
Operating income | 55.5 |  |  | 24.9 |  |  | 11.1 |  |  | 91.5 |
Earnings available for common stock |  |  |  |  |  |  | 61.8 |
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 June 30, 2015 |  |  |  |  |  |  |
Operating revenues |  | $301.0 |  |  |  | $21.9 |  |  |  | $1.8 |  |  |  | $324.7 |
Operating income | 67.0 |  |  | 0.4 |  |  | 0.9 |  |  | 68.3 |
Earnings available for common stock |  |  |  |  |  |  | 39.0 |
Three Months Ended June 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $289.3 |  |  |  | $33.2 |  |  |  | $2.0 |  |  |  | $324.5 |
Operating income (loss) | 60.1 |  |  | 1.1 |  |  | (1.2 | ) |  | 60.0 |
Earnings available for common stock |  |  |  |  |  |  | 34.6 |
Six Months Ended June 30, 2015 |  |  |  |  |  |  |
Operating revenues |  | $609.7 |  |  |  | $109.1 |  |  |  | $3.0 |  |  |  | $721.8 |
Operating income | 131.4 |  |  | 16.1 |  |  | 1.6 |  |  | 149.1 |
Earnings available for common stock |  |  |  |  |  |  | 83.6 |
Six Months Ended June 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $590.9 |  |  |  | $138.2 |  |  |  | $5.8 |  |  |  | $734.9 |
Operating income (loss) | 127.9 |  |  | 20.8 |  |  | (1.0 | ) |  | 147.7 |
Earnings available for common stock |  |  |  |  |  |  | 89.4 |
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 |  | Non-Regulated, |  | Alliant Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Three Months Ended June 30, 2015 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $640.4 |  |  |  | $51.7 |  |  |  | $14.8 |  |  |  | $706.9 |  |  |  | $10.3 |  |  |  | $717.2 |
Operating income (loss) | 100.9 |  |  | (2.0 | ) |  | 3.2 |  |  | 102.1 |  |  | 6.9 |  |  | 109.0 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 55.7 |  |  | 13.2 |  |  | 68.9 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (1.3 | ) |  | (1.3 | )
Net income |  |  |  |  |  |  | 55.7 |  |  | 11.9 |  |  | 67.6 |
Three Months Ended June 30, 2014 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $643.9 |  |  |  | $76.9 |  |  |  | $15.6 |  |  |  | $736.4 |  |  |  | $13.9 |  |  |  | $750.3 |
Operating income | 89.1 |  |  | 2.7 |  |  | 2.2 |  |  | 94.0 |  |  | 9.3 |  |  | 103.3 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 53.0 |  |  | 9.1 |  |  | 62.1 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (0.3 | ) |  | (0.3 | )
Net income |  |  |  |  |  |  | 53.0 |  |  | 8.8 |  |  | 61.8 |
| Utility |  | Non-Regulated, |  | Alliant Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Six Months Ended June 30, 2015 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $1,311.7 |  |  |  | $250.1 |  |  |  | $31.2 |  |  |  | $1,593.0 |  |  |  | $21.6 |  |  |  | $1,614.6 |
Operating income | 205.6 |  |  | 34.3 |  |  | 8.5 |  |  | 248.4 |  |  | 13.5 |  |  | 261.9 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 148.1 |  |  | 17.4 |  |  | 165.5 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (1.3 | ) |  | (1.3 | )
Net income |  |  |  |  |  |  | 148.1 |  |  | 16.1 |  |  | 164.2 |
Six Months Ended June 30, 2014 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $1,319.7 |  |  |  | $317.6 |  |  |  | $38.4 |  |  |  | $1,675.7 |  |  |  | $27.4 |  |  |  | $1,703.1 |
Operating income | 183.4 |  |  | 45.7 |  |  | 10.1 |  |  | 239.2 |  |  | 18.3 |  |  | 257.5 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 151.2 |  |  | 18.9 |  |  | 170.1 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (0.3 | ) |  | (0.3 | )
Net income |  |  |  |  |  |  | 151.2 |  |  | 18.6 |  |  | 169.8 |
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 June 30, 2015 |  |  |  |  |  |  |
Operating revenues |  | $339.4 |  |  |  | $29.8 |  |  |  | $13.0 |  |  |  | $382.2 |
Operating income (loss) | 33.9 |  |  | (2.4 | ) |  | 2.3 |  |  | 33.8 |
Earnings available for common stock |  |  |  |  |  |  | 16.7 |
Three Months Ended June 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $354.6 |  |  |  | $43.7 |  |  |  | $13.6 |  |  |  | $411.9 |
Operating income | 29.0 |  |  | 1.6 |  |  | 3.4 |  |  | 34.0 |
Earnings available for common stock |  |  |  |  |  |  | 18.4 |
Six Months Ended June 30, 2015 |  |  |  |  |  |  |
Operating revenues |  | $702.0 |  |  |  | $141.0 |  |  |  | $28.2 |  |  |  | $871.2 |
Operating income | 74.2 |  |  | 18.2 |  |  | 6.9 |  |  | 99.3 |
Earnings available for common stock |  |  |  |  |  |  | 64.5 |
Six Months Ended June 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $728.8 |  |  |  | $179.4 |  |  |  | $32.6 |  |  |  | $940.8 |
Operating income | 55.5 |  |  | 24.9 |  |  | 11.1 |  |  | 91.5 |
Earnings available for common stock |  |  |  |  |  |  | 61.8 |
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 June 30, 2015 |  |  |  |  |  |  |
Operating revenues |  | $301.0 |  |  |  | $21.9 |  |  |  | $1.8 |  |  |  | $324.7 |
Operating income | 67.0 |  |  | 0.4 |  |  | 0.9 |  |  | 68.3 |
Earnings available for common stock |  |  |  |  |  |  | 39.0 |
Three Months Ended June 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $289.3 |  |  |  | $33.2 |  |  |  | $2.0 |  |  |  | $324.5 |
Operating income (loss) | 60.1 |  |  | 1.1 |  |  | (1.2 | ) |  | 60.0 |
Earnings available for common stock |  |  |  |  |  |  | 34.6 |
Six Months Ended June 30, 2015 |  |  |  |  |  |  |
Operating revenues |  | $609.7 |  |  |  | $109.1 |  |  |  | $3.0 |  |  |  | $721.8 |
Operating income | 131.4 |  |  | 16.1 |  |  | 1.6 |  |  | 149.1 |
Earnings available for common stock |  |  |  |  |  |  | 83.6 |
Six Months Ended June 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $590.9 |  |  |  | $138.2 |  |  |  | $5.8 |  |  |  | $734.9 |
Operating income (loss) | 127.9 |  |  | 20.8 |  |  | (1.0 | ) |  | 147.7 |
Earnings available for common stock |  |  |  |  |  |  | 89.4 |

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