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v3.10.0.1

Consolidated Statements of Common Equity - USD ($) $ in Millions | Total | IPL [Member] | WPL [Member] | Common Stock [Member] | Common Stock [Member] IPL [Member] | Common Stock [Member] WPL [Member] | Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member] IPL [Member] | Additional Paid-in Capital [Member] WPL [Member] | Retained Earnings [Member] | Retained Earnings [Member] IPL [Member] | Retained Earnings [Member] WPL [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Shares in Deferred Compensation Trust [Member] | Preferred Stock [Member] | Preferred Stock [Member] IPL [Member] | Noncontrolling Interest [Member] WPL [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2015 |  |  |  | $ 2.3 | $ 33.4 | $ 66.2 | $ 1,661.8 | $ 1,407.8 | $ 959.0 | $ 2,068.9 | $ 554.1 | $ 731.1 | $ (0.4) | $ (8.5) | $ 200.0 | $ 200.0 | $ 11.3
Beginning balance at Dec. 31, 2015 | $ 3,924.1 | $ 2,195.3 | $ 1,767.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareowners' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common shareowners | 371.5 | 215.6 | 190.4 |  |  |  |  |  |  | 371.5 | 215.6 | 190.4 |  |  |  |  | 2.4
Net income | 381.7 | 225.8 | 192.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends | (266.5) | (151.9) | (135.0) |  |  |  |  |  |  | (266.5) | (151.9) | (135.0) |  |  |  |  |
Common stock issued, net | 26.6 |  |  |  |  |  | 26.6 |  |  |  |  |  |  |  |  |  |
Capital contributions from parent |  | 190.0 | 60.0 |  |  |  |  | 190.0 | 60.0 |  |  |  |  |  |  |  |
Contributions from noncontrolling interest |  |  | 11.5 |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.5
Distributions to noncontrolling interest |  |  | (2.5) |  |  |  |  |  |  |  |  |  |  |  |  |  | (2.5)
Transfer of investment in ATC to ATI |  |  | (163.6) |  |  |  |  |  |  |  |  | (140.9) |  |  |  |  | (22.7)
Other | 6.3 |  |  |  |  |  | 4.7 |  |  | 3.1 |  |  |  | (1.5) |  |  |
Other comprehensive income (loss), net of tax | 0.0 | 0.0 | 0.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2016 | 4,062.0 |  |  | 2.3 | 33.4 | 66.2 | 1,693.1 | 1,597.8 | 1,019.0 | 2,177.0 | 617.8 | 645.6 | (0.4) | (10.0) | 200.0 | 200.0 | 0.0
Ending balance at Dec. 31, 2016 |  | 2,449.0 | 1,730.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareowners' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common shareowners | 457.3 | 216.8 | 186.6 |  |  |  |  |  |  | 457.3 | 216.8 | 186.6 |  |  |  |  |
Net income | 467.5 | 227.0 | 186.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends | (288.3) | (156.1) | (125.9) |  |  |  |  |  |  | (288.3) | (156.1) | (125.9) |  |  |  |  |
Common stock issued, net | 149.6 |  |  |  |  |  | 149.6 |  |  |  |  |  |  |  |  |  |
Capital contributions from parent |  | 200.0 | 90.0 |  |  |  |  | 200.0 | 90.0 |  |  |  |  |  |  |  |
Transfer of investment in ATC to ATI |  |  | 0.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other | 1.7 |  |  |  |  |  | 2.8 |  |  |  |  |  |  | (1.1) |  |  |
Other comprehensive income (loss), net of tax | (0.1) | 0.0 | 0.0 |  |  |  |  |  |  |  |  |  | (0.1) |  |  |  |
Ending balance at Dec. 31, 2017 | 4,182.2 | 2,509.7 | 1,881.5 | 2.3 | 33.4 | 66.2 | 1,845.5 | 1,797.8 | 1,109.0 | 2,346.0 | 678.5 | 706.3 | (0.5) | (11.1) | 200.0 | 200.0 | 0.0
Ending balance at Dec. 31, 2017 | 4,382.2 | 2,709.7 | 1,881.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareowners' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common shareowners | 512.1 | 264.0 | 208.1 |  |  |  |  |  |  | 512.1 | 264.0 | 208.1 |  |  |  |  |
Net income | 522.3 | 274.2 | 208.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends | (312.2) | (168.0) | (140.1) |  |  |  |  |  |  | (312.2) | (168.0) | (140.1) |  |  |  |  |
Common stock issued, net | 196.6 |  |  | 0.1 |  |  | 196.5 |  |  |  |  |  |  |  |  |  |
Capital contributions from parent |  | 425.0 | 200.0 |  |  |  |  | 425.0 | 200.0 |  |  |  |  |  |  |  |
Transfer of investment in ATC to ATI |  |  | 0.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other | 4.8 |  |  |  |  |  | 3.5 |  |  |  |  |  |  | 1.3 |  |  |
Other comprehensive income (loss), net of tax | 2.2 | 0.0 | 0.0 |  |  |  |  |  |  |  |  |  | 2.2 |  |  |  |
Ending balance at Dec. 31, 2018 | 4,585.7 | 3,030.7 | 2,149.5 | $ 2.4 | $ 33.4 | $ 66.2 | $ 2,045.5 | $ 2,222.8 | $ 1,309.0 | $ 2,545.9 | $ 774.5 | $ 774.3 | $ 1.7 | $ (9.8) | $ 200.0 | $ 200.0 | $ 0.0
Ending balance at Dec. 31, 2018 | $ 4,785.7 | $ 3,230.7 | $ 2,149.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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