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Segments Of Business (Schedule Of Segments Of Business) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Operating revenues $ 717.2 $ 750.3 $ 1,614.6 $ 1,703.1
Operating income (loss) 109.0 103.3 261.9 257.5
Income from continuing operations, net of tax 68.9 62.1 165.5 170.1
Loss from discontinued operations, net of tax (1.3) (0.3) (1.3) (0.3)
Net income (loss) attributable to common shareowners 67.6 61.8 164.2 169.8
IPL [Member]        
Segment Reporting Information [Line Items]        
Operating revenues 382.2 411.9 871.2 940.8
Operating income (loss) 33.8 34.0 99.3 91.5
Net income (loss) attributable to common shareowners 16.7 18.4 64.5 61.8
WPL [Member]        
Segment Reporting Information [Line Items]        
Operating revenues 324.7 324.5 721.8 734.9
Operating income (loss) 68.3 60.0 149.1 147.7
Net income (loss) attributable to common shareowners 39.0 34.6 83.6 89.4
Electric [Member]        
Segment Reporting Information [Line Items]        
Operating revenues 640.4 643.9 1,311.7 1,319.7
Operating income (loss) 100.9 89.1 205.6 183.4
Electric [Member] | IPL [Member]        
Segment Reporting Information [Line Items]        
Operating revenues 339.4 354.6 702.0 728.8
Operating income (loss) 33.9 29.0 74.2 55.5
Electric [Member] | WPL [Member]        
Segment Reporting Information [Line Items]        
Operating revenues 301.0 289.3 609.7 590.9
Operating income (loss) 67.0 60.1 131.4 127.9
Gas [Member]        
Segment Reporting Information [Line Items]        
Operating revenues 51.7 76.9 250.1 317.6
Operating income (loss) (2.0) 2.7 34.3 45.7
Gas [Member] | IPL [Member]        
Segment Reporting Information [Line Items]        
Operating revenues 29.8 43.7 141.0 179.4
Operating income (loss) (2.4) 1.6 18.2 24.9
Gas [Member] | WPL [Member]        
Segment Reporting Information [Line Items]        
Operating revenues 21.9 33.2 109.1 138.2
Operating income (loss) 0.4 1.1 16.1 20.8
Other Utilities [Member]        
Segment Reporting Information [Line Items]        
Operating revenues 14.8 15.6 31.2 38.4
Operating income (loss) 3.2 2.2 8.5 10.1
Other Utilities [Member] | IPL [Member]        
Segment Reporting Information [Line Items]        
Operating revenues 13.0 13.6 28.2 32.6
Operating income (loss) 2.3 3.4 6.9 11.1
Other Utilities [Member] | WPL [Member]        
Segment Reporting Information [Line Items]        
Operating revenues 1.8 2.0 3.0 5.8
Operating income (loss) 0.9 (1.2) 1.6 (1.0)
Utilities Business [Member]        
Segment Reporting Information [Line Items]        
Operating revenues 706.9 736.4 1,593.0 1,675.7
Operating income (loss) 102.1 94.0 248.4 239.2
Income from continuing operations, net of tax 55.7 53.0 148.1 151.2
Loss from discontinued operations, net of tax 0.0 0.0 0.0 0.0
Net income (loss) attributable to common shareowners 55.7 53.0 148.1 151.2
Non-Regulated [Member] | Other Segments [Member]        
Segment Reporting Information [Line Items]        
Operating revenues 10.3 13.9 21.6 27.4
Operating income (loss) 6.9 9.3 13.5 18.3
Income from continuing operations, net of tax 13.2 9.1 17.4 18.9
Loss from discontinued operations, net of tax (1.3) (0.3) (1.3) (0.3)
Net income (loss) attributable to common shareowners $ 11.9 $ 8.8 $ 16.1 $ 18.6