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Segments Of Business (Tables) | 12 Months Ended
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Dec. 31, 2014
Segment Reporting Information [Line Items] |
Schedule of Segments of Business | Certain financial information relating to Alliant Energy’s business segments, products and services and geographic information was as follows (in millions):
| Utility |  | Non-Regulated, |  | Alliant Energy
2014 | Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
Operating revenues |  | $2,713.6 |  |  |  | $517.5 |  |  |  | $66.1 |  |  |  | $3,297.2 |  |  |  | $53.1 |  |  |  | $3,350.3 |
Depreciation and amortization | 347.0 |  |  | 29.9 |  |  | 1.8 |  |  | 378.7 |  |  | 9.4 |  |  | 388.1 |
Operating income | 442.4 |  |  | 53.8 |  |  | 14.0 |  |  | 510.2 |  |  | 33.4 |  |  | 543.6 |
Interest expense |  |  |  |  |  |  | 176.3 |  |  | 4.3 |  |  | 180.6 |
Equity income from unconsolidated investments, net | (42.8 | ) |  | — |  |  | — |  |  | (42.8 | ) |  | 2.4 |  |  | (40.4 | )
Income taxes |  |  |  |  |  |  | 33.9 |  |  | 10.4 |  |  | 44.3 |
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 364.5 |  |  | 18.6 |  |  | 383.1 |
Total assets | 9,660.4 |  |  | 913.5 |  |  | 1,016.1 |  |  | 11,590.0 |  |  | 495.9 |  |  | 12,085.9 |
Investments in equity method subsidiaries | 294.3 |  |  | — |  |  | — |  |  | 294.3 |  |  | 2.3 |  |  | 296.6 |
Construction and acquisition expenditures | 774.8 |  |  | 63.2 |  |  | 0.9 |  |  | 838.9 |  |  | 63.9 |  |  | 902.8 |
| Utility |  | Non-Regulated, |  | Alliant Energy
2013 | Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
Operating revenues |  | $2,689.0 |  |  |  | $464.8 |  |  |  | $71.3 |  |  |  | $3,225.1 |  |  |  | $51.7 |  |  |  | $3,276.8 |
Depreciation and amortization | 333.0 |  |  | 28.8 |  |  | 1.5 |  |  | 363.3 |  |  | 7.6 |  |  | 370.9 |
Operating income | 444.5 |  |  | 57.3 |  |  | 6.3 |  |  | 508.1 |  |  | 25.8 |  |  | 533.9 |
Interest expense |  |  |  |  |  |  | 166.3 |  |  | 6.5 |  |  | 172.8 |
Equity income from unconsolidated investments, net | (43.7 | ) |  | — |  |  | — |  |  | (43.7 | ) |  | — |  |  | (43.7 | )
Income taxes |  |  |  |  |  |  | 49.3 |  |  | 4.6 |  |  | 53.9 |
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 349.5 |  |  | 8.8 |  |  | 358.3 |
Total assets | 9,018.6 |  |  | 859.3 |  |  | 732.5 |  |  | 10,610.4 |  |  | 502.0 |  |  | 11,112.4 |
Investments in equity method subsidiaries | 279.1 |  |  | — |  |  | — |  |  | 279.1 |  |  | 2.3 |  |  | 281.4 |
Construction and acquisition expenditures | 677.3 |  |  | 47.0 |  |  | 7.3 |  |  | 731.6 |  |  | 66.7 |  |  | 798.3 |
| Utility |  | Non-Regulated, |  | Alliant Energy
2012 | Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
Operating revenues |  | $2,589.3 |  |  |  | $396.3 |  |  |  | $56.7 |  |  |  | $3,042.3 |  |  |  | $52.2 |  |  |  | $3,094.5 |
Depreciation and amortization | 299.3 |  |  | 29.1 |  |  | 1.4 |  |  | 329.8 |  |  | 2.6 |  |  | 332.4 |
Operating income | 426.2 |  |  | 51.5 |  |  | 7.4 |  |  | 485.1 |  |  | 34.6 |  |  | 519.7 |
Interest expense |  |  |  |  |  |  | 158.7 |  |  | (2.0 | ) |  | 156.7 |
Equity (income) loss from unconsolidated investments, net | (42.1 | ) |  | — |  |  | — |  |  | (42.1 | ) |  | 0.8 |  |  | (41.3 | )
Income taxes |  |  |  |  |  |  | 74.8 |  |  | 14.6 |  |  | 89.4 |
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 300.0 |  |  | 19.8 |  |  | 319.8 |
Total assets | 8,438.8 |  |  | 814.8 |  |  | 966.0 |  |  | 10,219.6 |  |  | 565.9 |  |  | 10,785.5 |
Investments in equity method subsidiaries | 264.3 |  |  | — |  |  | — |  |  | 264.3 |  |  | 2.3 |  |  | 266.6 |
Construction and acquisition expenditures | 994.0 |  |  | 31.4 |  |  | 0.1 |  |  | 1,025.5 |  |  | 132.6 |  |  | 1,158.1 |
Schedule of Products and Services | Alliant Energy’s consolidated operating revenues by segment, which were substantially all related to services, were as follows:
| 2014 |  | 2013 |  | 2012
Utility electric operations | 81 | % |  | 82 | % |  | 84 | %
Utility gas operations | 15 | % |  | 14 | % |  | 13 | %
Utility other | 2 | % |  | 2 | % |  | 2 | %
Other | 2 | % |  | 2 | % |  | 1 | %
| 100 | % |  | 100 | % |  | 100 | %
IPL [Member] |
Segment Reporting Information [Line Items] |
Schedule of Segments of Business | Certain financial information relating to IPL’s business segments was as follows (in millions):
2014 | Electric |  | Gas |  | Other |  | Total
Operating revenues |  | $1,493.3 |  |  |  | $296.5 |  |  |  | $58.3 |  |  |  | $1,848.1 |
Depreciation and amortization | 178.7 |  |  | 17.0 |  |  | 1.8 |  |  | 197.5 |
Operating income | 166.8 |  |  | 25.7 |  |  | 16.7 |  |  | 209.2 |
Interest expense |  |  |  |  |  |  | 89.9 |
Income tax benefit |  |  |  |  |  |  | (51.7 | )
Earnings available for common stock |  |  |  |  |  |  | 184.4 |
Total assets | 5,398.3 |  |  | 544.1 |  |  | 519.4 |  |  | 6,461.8 |
Construction and acquisition expenditures | 490.0 |  |  | 35.1 |  |  | 0.9 |  |  | 526.0 |
2013 | Electric |  | Gas |  | Other |  | Total
Operating revenues |  | $1,491.8 |  |  |  | $273.9 |  |  |  | $53.1 |  |  |  | $1,818.8 |
Depreciation and amortization | 173.1 |  |  | 16.5 |  |  | 1.5 |  |  | 191.1 |
Operating income | 173.1 |  |  | 29.8 |  |  | 9.1 |  |  | 212.0 |
Interest expense |  |  |  |  |  |  | 81.3 |
Income tax benefit |  |  |  |  |  |  | (37.9 | )
Earnings available for common stock |  |  |  |  |  |  | 173.6 |
Total assets | 4,905.3 |  |  | 518.8 |  |  | 381.9 |  |  | 5,806.0 |
Construction and acquisition expenditures | 365.4 |  |  | 27.5 |  |  | 7.3 |  |  | 400.2 |
2012 | Electric |  | Gas |  | Other |  | Total
Operating revenues |  | $1,371.1 |  |  |  | $226.7 |  |  |  | $52.5 |  |  |  | $1,650.3 |
Depreciation and amortization | 171.2 |  |  | 16.3 |  |  | 1.4 |  |  | 188.9 |
Operating income | 166.2 |  |  | 24.2 |  |  | 9.9 |  |  | 200.3 |
Interest expense |  |  |  |  |  |  | 78.5 |
Income tax benefit |  |  |  |  |  |  | (19.8 | )
Earnings available for common stock |  |  |  |  |  |  | 137.6 |
Total assets | 4,500.9 |  |  | 479.5 |  |  | 476.6 |  |  | 5,457.0 |
Construction and acquisition expenditures | 291.0 |  |  | 16.4 |  |  | 0.1 |  |  | 307.5 |
WPL [Member] |
Segment Reporting Information [Line Items] |
Schedule of Segments of Business | Certain financial information relating to WPL’s business segments was as follows (in millions):
2014 | Electric |  | Gas |  | Other |  | Total
Operating revenues |  | $1,220.3 |  |  |  | $221.0 |  |  |  | $7.8 |  |  |  | $1,449.1 |
Depreciation and amortization | 168.3 |  |  | 12.9 |  |  | — |  |  | 181.2 |
Operating income (loss) | 275.6 |  |  | 28.1 |  |  | (2.7 | ) |  | 301.0 |
Interest expense |  |  |  |  |  |  | 86.4 |
Equity income from unconsolidated investments | (42.8 | ) |  | — |  |  | — |  |  | (42.8 | )
Income taxes |  |  |  |  |  |  | 85.6 |
Earnings available for common stock |  |  |  |  |  |  | 180.1 |
Total assets | 4,262.1 |  |  | 369.4 |  |  | 496.7 |  |  | 5,128.2 |
Investments in equity method subsidiaries | 294.3 |  |  | — |  |  | — |  |  | 294.3 |
Construction and acquisition expenditures | 284.8 |  |  | 28.1 |  |  | — |  |  | 312.9 |
2013 | Electric |  | Gas |  | Other |  | Total
Operating revenues |  | $1,197.2 |  |  |  | $190.9 |  |  |  | $18.2 |  |  |  | $1,406.3 |
Depreciation and amortization | 159.9 |  |  | 12.3 |  |  | — |  |  | 172.2 |
Operating income (loss) | 271.4 |  |  | 27.5 |  |  | (2.8 | ) |  | 296.1 |
Interest expense |  |  |  |  |  |  | 85.0 |
Equity income from unconsolidated investments | (43.7 | ) |  | — |  |  | — |  |  | (43.7 | )
Income taxes |  |  |  |  |  |  | 87.2 |
Earnings available for common stock |  |  |  |  |  |  | 175.9 |
Total assets | 4,113.3 |  |  | 340.5 |  |  | 350.6 |  |  | 4,804.4 |
Investments in equity method subsidiaries | 279.1 |  |  | — |  |  | — |  |  | 279.1 |
Construction and acquisition expenditures | 311.9 |  |  | 19.5 |  |  | — |  |  | 331.4 |
2012 | Electric |  | Gas |  | Other |  | Total
Operating revenues |  | $1,218.2 |  |  |  | $169.6 |  |  |  | $4.2 |  |  |  | $1,392.0 |
Depreciation and amortization | 128.1 |  |  | 12.8 |  |  | — |  |  | 140.9 |
Operating income (loss) | 260.0 |  |  | 27.3 |  |  | (2.5 | ) |  | 284.8 |
Interest expense |  |  |  |  |  |  | 80.2 |
Equity income from unconsolidated investments | (42.1 | ) |  | — |  |  | — |  |  | (42.1 | )
Income taxes |  |  |  |  |  |  | 94.6 |
Earnings available for common stock |  |  |  |  |  |  | 162.4 |
Total assets | 3,937.9 |  |  | 335.3 |  |  | 489.4 |  |  | 4,762.6 |
Investments in equity method subsidiaries | 264.3 |  |  | — |  |  | — |  |  | 264.3 |
Construction and acquisition expenditures | 703.0 |  |  | 15.0 |  |  | — |  |  | 718.0 |

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