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Segments Of Business | 9 Months Ended
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Sep. 30, 2014
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.
| Utilities |  | Non-Regulated, |  | Alliant Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Three Months Ended September 30, 2014 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $771.2 |  |  |  | $47.2 |  |  |  | $12.2 |  |  |  | $830.6 |  |  |  | $12.5 |  |  |  | $843.1 |
Operating income (loss) | 190.8 |  |  | (4.4 | ) |  | 1.4 |  |  | 187.8 |  |  | 7.0 |  |  | 194.8 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax |  |  |  |  |  |  | 164.1 |  |  | (8.9 | ) |  | 155.2 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (1.9 | ) |  | (1.9 | )
Net income (loss) attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 164.1 |  |  | (10.8 | ) |  | 153.3 |
Three Months Ended September 30, 2013 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $798.1 |  |  |  | $39.8 |  |  |  | $17.4 |  |  |  | $855.3 |  |  |  | $11.3 |  |  |  | $866.6 |
Operating income (loss) | 199.6 |  |  | (3.4 | ) |  | (0.3 | ) |  | 195.9 |  |  | 5.5 |  |  | 201.4 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax |  |  |  |  |  |  | 171.3 |  |  | (12.4 | ) |  | 158.9 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (1.3 | ) |  | (1.3 | )
Net income (loss) attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 171.3 |  |  | (13.7 | ) |  | 157.6 |
| Utilities |  | Non-Regulated, |  | Alliant Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Nine Months Ended September 30, 2014 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $2,090.9 |  |  |  | $364.8 |  |  |  | $50.6 |  |  |  | $2,506.3 |  |  |  | $39.9 |  |  |  | $2,546.2 |
Operating income | 374.2 |  |  | 41.3 |  |  | 11.5 |  |  | 427.0 |  |  | 25.3 |  |  | 452.3 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 315.3 |  |  | 10.0 |  |  | 325.3 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (2.2 | ) |  | (2.2 | )
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 315.3 |  |  | 7.8 |  |  | 323.1 |
Nine Months Ended September 30, 2013 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $2,043.4 |  |  |  | $310.5 |  |  |  | $52.4 |  |  |  | $2,406.3 |  |  |  | $37.9 |  |  |  | $2,444.2 |
Operating income | 359.1 |  |  | 39.5 |  |  | 5.5 |  |  | 404.1 |  |  | 21.2 |  |  | 425.3 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 292.8 |  |  | 4.9 |  |  | 297.7 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (4.9 | ) |  | (4.9 | )
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 292.8 |  |  | — |  |  | 292.8 |
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 September 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $435.9 |  |  |  | $28.7 |  |  |  | $11.6 |  |  |  | $476.2 |
Operating income (loss) | 94.7 |  |  | (2.8 | ) |  | 2.0 |  |  | 93.9 |
Earnings available for common stock |  |  |  |  |  |  | 102.5 |
Three Months Ended September 30, 2013 |  |  |  |  |  |  |
Operating revenues |  | $457.6 |  |  |  | $24.6 |  |  |  | $12.2 |  |  |  | $494.4 |
Operating income (loss) | 99.6 |  |  | (0.7 | ) |  | 1.1 |  |  | 100.0 |
Earnings available for common stock |  |  |  |  |  |  | 110.0 |
Nine Months Ended September 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $1,164.7 |  |  |  | $208.1 |  |  |  | $44.2 |  |  |  | $1,417.0 |
Operating income | 150.2 |  |  | 22.1 |  |  | 13.1 |  |  | 185.4 |
Earnings available for common stock |  |  |  |  |  |  | 164.3 |
Nine Months Ended September 30, 2013 |  |  |  |  |  |  |
Operating revenues |  | $1,137.4 |  |  |  | $180.9 |  |  |  | $37.4 |  |  |  | $1,355.7 |
Operating income | 146.2 |  |  | 22.6 |  |  | 7.0 |  |  | 175.8 |
Earnings available for common stock |  |  |  |  |  |  | 155.1 |
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 September 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $335.3 |  |  |  | $18.5 |  |  |  | $0.6 |  |  |  | $354.4 |
Operating income (loss) | 96.1 |  |  | (1.6 | ) |  | (0.6 | ) |  | 93.9 |
Earnings available for common stock |  |  |  |  |  |  | 61.6 |
Three Months Ended September 30, 2013 |  |  |  |  |  |  |
Operating revenues |  | $340.5 |  |  |  | $15.2 |  |  |  | $5.2 |  |  |  | $360.9 |
Operating income (loss) | 100.0 |  |  | (2.7 | ) |  | (1.4 | ) |  | 95.9 |
Earnings available for common stock |  |  |  |  |  |  | 61.3 |
Nine Months Ended September 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $926.2 |  |  |  | $156.7 |  |  |  | $6.4 |  |  |  | $1,089.3 |
Operating income (loss) | 224.0 |  |  | 19.2 |  |  | (1.6 | ) |  | 241.6 |
Earnings available for common stock |  |  |  |  |  |  | 151.0 |
Nine Months Ended September 30, 2013 |  |  |  |  |  |  |
Operating revenues |  | $906.0 |  |  |  | $129.6 |  |  |  | $15.0 |  |  |  | $1,050.6 |
Operating income (loss) | 212.9 |  |  | 16.9 |  |  | (1.5 | ) |  | 228.3 |
Earnings available for common stock |  |  |  |  |  |  | 137.7 |
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.
| Utilities |  | Non-Regulated, |  | Alliant Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Three Months Ended September 30, 2014 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $771.2 |  |  |  | $47.2 |  |  |  | $12.2 |  |  |  | $830.6 |  |  |  | $12.5 |  |  |  | $843.1 |
Operating income (loss) | 190.8 |  |  | (4.4 | ) |  | 1.4 |  |  | 187.8 |  |  | 7.0 |  |  | 194.8 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax |  |  |  |  |  |  | 164.1 |  |  | (8.9 | ) |  | 155.2 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (1.9 | ) |  | (1.9 | )
Net income (loss) attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 164.1 |  |  | (10.8 | ) |  | 153.3 |
Three Months Ended September 30, 2013 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $798.1 |  |  |  | $39.8 |  |  |  | $17.4 |  |  |  | $855.3 |  |  |  | $11.3 |  |  |  | $866.6 |
Operating income (loss) | 199.6 |  |  | (3.4 | ) |  | (0.3 | ) |  | 195.9 |  |  | 5.5 |  |  | 201.4 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax |  |  |  |  |  |  | 171.3 |  |  | (12.4 | ) |  | 158.9 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (1.3 | ) |  | (1.3 | )
Net income (loss) attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 171.3 |  |  | (13.7 | ) |  | 157.6 |
| Utilities |  | Non-Regulated, |  | Alliant Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Nine Months Ended September 30, 2014 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $2,090.9 |  |  |  | $364.8 |  |  |  | $50.6 |  |  |  | $2,506.3 |  |  |  | $39.9 |  |  |  | $2,546.2 |
Operating income | 374.2 |  |  | 41.3 |  |  | 11.5 |  |  | 427.0 |  |  | 25.3 |  |  | 452.3 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 315.3 |  |  | 10.0 |  |  | 325.3 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (2.2 | ) |  | (2.2 | )
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 315.3 |  |  | 7.8 |  |  | 323.1 |
Nine Months Ended September 30, 2013 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $2,043.4 |  |  |  | $310.5 |  |  |  | $52.4 |  |  |  | $2,406.3 |  |  |  | $37.9 |  |  |  | $2,444.2 |
Operating income | 359.1 |  |  | 39.5 |  |  | 5.5 |  |  | 404.1 |  |  | 21.2 |  |  | 425.3 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 292.8 |  |  | 4.9 |  |  | 297.7 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (4.9 | ) |  | (4.9 | )
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 292.8 |  |  | — |  |  | 292.8 |
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 September 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $435.9 |  |  |  | $28.7 |  |  |  | $11.6 |  |  |  | $476.2 |
Operating income (loss) | 94.7 |  |  | (2.8 | ) |  | 2.0 |  |  | 93.9 |
Earnings available for common stock |  |  |  |  |  |  | 102.5 |
Three Months Ended September 30, 2013 |  |  |  |  |  |  |
Operating revenues |  | $457.6 |  |  |  | $24.6 |  |  |  | $12.2 |  |  |  | $494.4 |
Operating income (loss) | 99.6 |  |  | (0.7 | ) |  | 1.1 |  |  | 100.0 |
Earnings available for common stock |  |  |  |  |  |  | 110.0 |
Nine Months Ended September 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $1,164.7 |  |  |  | $208.1 |  |  |  | $44.2 |  |  |  | $1,417.0 |
Operating income | 150.2 |  |  | 22.1 |  |  | 13.1 |  |  | 185.4 |
Earnings available for common stock |  |  |  |  |  |  | 164.3 |
Nine Months Ended September 30, 2013 |  |  |  |  |  |  |
Operating revenues |  | $1,137.4 |  |  |  | $180.9 |  |  |  | $37.4 |  |  |  | $1,355.7 |
Operating income | 146.2 |  |  | 22.6 |  |  | 7.0 |  |  | 175.8 |
Earnings available for common stock |  |  |  |  |  |  | 155.1 |
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 September 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $335.3 |  |  |  | $18.5 |  |  |  | $0.6 |  |  |  | $354.4 |
Operating income (loss) | 96.1 |  |  | (1.6 | ) |  | (0.6 | ) |  | 93.9 |
Earnings available for common stock |  |  |  |  |  |  | 61.6 |
Three Months Ended September 30, 2013 |  |  |  |  |  |  |
Operating revenues |  | $340.5 |  |  |  | $15.2 |  |  |  | $5.2 |  |  |  | $360.9 |
Operating income (loss) | 100.0 |  |  | (2.7 | ) |  | (1.4 | ) |  | 95.9 |
Earnings available for common stock |  |  |  |  |  |  | 61.3 |
Nine Months Ended September 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $926.2 |  |  |  | $156.7 |  |  |  | $6.4 |  |  |  | $1,089.3 |
Operating income (loss) | 224.0 |  |  | 19.2 |  |  | (1.6 | ) |  | 241.6 |
Earnings available for common stock |  |  |  |  |  |  | 151.0 |
Nine Months Ended September 30, 2013 |  |  |  |  |  |  |
Operating revenues |  | $906.0 |  |  |  | $129.6 |  |  |  | $15.0 |  |  |  | $1,050.6 |
Operating income (loss) | 212.9 |  |  | 16.9 |  |  | (1.5 | ) |  | 228.3 |
Earnings available for common stock |  |  |  |  |  |  | 137.7 |
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.
| Utilities |  | Non-Regulated, |  | Alliant Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Three Months Ended September 30, 2014 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $771.2 |  |  |  | $47.2 |  |  |  | $12.2 |  |  |  | $830.6 |  |  |  | $12.5 |  |  |  | $843.1 |
Operating income (loss) | 190.8 |  |  | (4.4 | ) |  | 1.4 |  |  | 187.8 |  |  | 7.0 |  |  | 194.8 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax |  |  |  |  |  |  | 164.1 |  |  | (8.9 | ) |  | 155.2 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (1.9 | ) |  | (1.9 | )
Net income (loss) attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 164.1 |  |  | (10.8 | ) |  | 153.3 |
Three Months Ended September 30, 2013 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $798.1 |  |  |  | $39.8 |  |  |  | $17.4 |  |  |  | $855.3 |  |  |  | $11.3 |  |  |  | $866.6 |
Operating income (loss) | 199.6 |  |  | (3.4 | ) |  | (0.3 | ) |  | 195.9 |  |  | 5.5 |  |  | 201.4 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax |  |  |  |  |  |  | 171.3 |  |  | (12.4 | ) |  | 158.9 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (1.3 | ) |  | (1.3 | )
Net income (loss) attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 171.3 |  |  | (13.7 | ) |  | 157.6 |
| Utilities |  | Non-Regulated, |  | Alliant Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Nine Months Ended September 30, 2014 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $2,090.9 |  |  |  | $364.8 |  |  |  | $50.6 |  |  |  | $2,506.3 |  |  |  | $39.9 |  |  |  | $2,546.2 |
Operating income | 374.2 |  |  | 41.3 |  |  | 11.5 |  |  | 427.0 |  |  | 25.3 |  |  | 452.3 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 315.3 |  |  | 10.0 |  |  | 325.3 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (2.2 | ) |  | (2.2 | )
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 315.3 |  |  | 7.8 |  |  | 323.1 |
Nine Months Ended September 30, 2013 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $2,043.4 |  |  |  | $310.5 |  |  |  | $52.4 |  |  |  | $2,406.3 |  |  |  | $37.9 |  |  |  | $2,444.2 |
Operating income | 359.1 |  |  | 39.5 |  |  | 5.5 |  |  | 404.1 |  |  | 21.2 |  |  | 425.3 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 292.8 |  |  | 4.9 |  |  | 297.7 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (4.9 | ) |  | (4.9 | )
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 292.8 |  |  | — |  |  | 292.8 |
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 September 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $435.9 |  |  |  | $28.7 |  |  |  | $11.6 |  |  |  | $476.2 |
Operating income (loss) | 94.7 |  |  | (2.8 | ) |  | 2.0 |  |  | 93.9 |
Earnings available for common stock |  |  |  |  |  |  | 102.5 |
Three Months Ended September 30, 2013 |  |  |  |  |  |  |
Operating revenues |  | $457.6 |  |  |  | $24.6 |  |  |  | $12.2 |  |  |  | $494.4 |
Operating income (loss) | 99.6 |  |  | (0.7 | ) |  | 1.1 |  |  | 100.0 |
Earnings available for common stock |  |  |  |  |  |  | 110.0 |
Nine Months Ended September 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $1,164.7 |  |  |  | $208.1 |  |  |  | $44.2 |  |  |  | $1,417.0 |
Operating income | 150.2 |  |  | 22.1 |  |  | 13.1 |  |  | 185.4 |
Earnings available for common stock |  |  |  |  |  |  | 164.3 |
Nine Months Ended September 30, 2013 |  |  |  |  |  |  |
Operating revenues |  | $1,137.4 |  |  |  | $180.9 |  |  |  | $37.4 |  |  |  | $1,355.7 |
Operating income | 146.2 |  |  | 22.6 |  |  | 7.0 |  |  | 175.8 |
Earnings available for common stock |  |  |  |  |  |  | 155.1 |
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 September 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $335.3 |  |  |  | $18.5 |  |  |  | $0.6 |  |  |  | $354.4 |
Operating income (loss) | 96.1 |  |  | (1.6 | ) |  | (0.6 | ) |  | 93.9 |
Earnings available for common stock |  |  |  |  |  |  | 61.6 |
Three Months Ended September 30, 2013 |  |  |  |  |  |  |
Operating revenues |  | $340.5 |  |  |  | $15.2 |  |  |  | $5.2 |  |  |  | $360.9 |
Operating income (loss) | 100.0 |  |  | (2.7 | ) |  | (1.4 | ) |  | 95.9 |
Earnings available for common stock |  |  |  |  |  |  | 61.3 |
Nine Months Ended September 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $926.2 |  |  |  | $156.7 |  |  |  | $6.4 |  |  |  | $1,089.3 |
Operating income (loss) | 224.0 |  |  | 19.2 |  |  | (1.6 | ) |  | 241.6 |
Earnings available for common stock |  |  |  |  |  |  | 151.0 |
Nine Months Ended September 30, 2013 |  |  |  |  |  |  |
Operating revenues |  | $906.0 |  |  |  | $129.6 |  |  |  | $15.0 |  |  |  | $1,050.6 |
Operating income (loss) | 212.9 |  |  | 16.9 |  |  | (1.5 | ) |  | 228.3 |
Earnings available for common stock |  |  |  |  |  |  | 137.7 |

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