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v3.19.3.a.u2

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] | Cumulative Preferred Stock [Member] | Cumulative Preferred Stock [Member] IPL [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2016 |  |  |  | $ 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
Beginning balance at Dec. 31, 2016 | $ 4,062.0 | $ 2,449.0 | $ 1,730.8 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareowners' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common shareowners | 457.3 | 216.8 |  |  |  |  |  |  |  | 457.3 | 216.8 |  |  |  |  |
Net income | 467.5 | 227.0 | 186.6 |  |  |  |  |  |  |  |  | 186.6 |  |  |  |
Common stock dividends | (288.3) | (156.1) | (125.9) |  |  |  |  |  |  | (288.3) | (156.1) | (125.9) |  |  |  |
Equity forward settlements, At-the-market offering program and Shareowner Direct Plan issuances | 149.6 |  |  |  |  |  | 149.6 |  |  |  |  |  |  |  |  |
Capital contribution from parent |  | 200.0 | 90.0 |  |  |  |  | 200.0 | 90.0 |  |  |  |  |  |  |
Equity-based compensation plans and 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 |  |  |  | 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
Ending balance at Dec. 31, 2017 | 4,382.2 | 2,709.7 | 1,881.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareowners' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common shareowners | 512.1 | 264.0 |  |  |  |  |  |  |  | 512.1 | 264.0 |  |  |  |  |
Net income | 522.3 | 274.2 | 208.1 |  |  |  |  |  |  |  |  | 208.1 |  |  |  |
Common stock dividends | (312.2) | (168.0) | (140.1) |  |  |  |  |  |  | (312.2) | (168.0) | (140.1) |  |  |  |
Equity forward settlements, At-the-market offering program and Shareowner Direct Plan issuances | 196.6 |  |  | 0.1 |  |  | 196.5 |  |  |  |  |  |  |  |  |
Capital contribution from parent |  | 425.0 | 200.0 |  |  |  |  | 425.0 | 200.0 |  |  |  |  |  |  |
Equity-based compensation plans and 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
Ending balance at Dec. 31, 2018 | 4,785.7 | 3,230.7 | 2,149.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Shareowners' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common shareowners | 557.2 | 284.1 |  |  |  |  |  |  |  | 557.2 | 284.1 |  |  |  |  |
Net income | 567.4 | 294.3 | 233.0 |  |  |  |  |  |  |  |  | 233.0 |  |  |  |
Common stock dividends | (337.7) | (168.0) | (143.9) |  |  |  |  |  |  | (337.7) | (168.0) | (143.9) |  |  |  |
Equity forward settlements, At-the-market offering program and Shareowner Direct Plan issuances | 390.3 |  |  | 0.1 |  |  | 390.2 |  |  |  |  |  |  |  |  |
Capital contribution from parent |  | 125.0 | 125.0 |  |  |  |  | 125.0 | 125.0 |  |  |  |  |  |  |
Equity-based compensation plans and other | 10.0 |  |  |  |  |  | 10.2 |  |  |  |  |  |  | (0.2) |  |
Other comprehensive income (loss), net of tax | (0.4) | 0.0 | 0.0 |  |  |  |  |  |  |  |  |  | (0.4) |  |  |
Ending balance at Dec. 31, 2019 | 5,205.1 | 3,271.8 | 2,363.6 | $ 2.5 | $ 33.4 | $ 66.2 | $ 2,445.9 | $ 2,347.8 | $ 1,434.0 | $ 2,765.4 | $ 890.6 | $ 863.4 | $ 1.3 | $ (10.0) | $ 200.0 | $ 200.0
Ending balance at Dec. 31, 2019 | $ 5,405.1 | $ 3,471.8 | $ 2,363.6 |  |  |  |  |  |  |  |  |  |  |  |  |

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