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Revenue (Disaggregation of Revenues) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 763.1 $ 790.2 $ 1,678.8 $ 1,777.4
Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 675.2 691.2 1,405.5 1,434.6
Electric [Member] | Retail - residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 249.7 233.3 516.5 508.0
Electric [Member] | Retail - commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 164.0 171.3 346.3 352.4
Electric [Member] | Retail - industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 197.3 214.2 407.2 422.9
Electric [Member] | Wholesale [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 39.1 41.0 80.0 87.5
Electric [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 25.1 31.4 55.5 63.8
Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 58.9 65.2 211.1 281.0
Gas [Member] | Retail - residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 33.6 35.2 124.1 167.0
Gas [Member] | Retail - commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 14.7 16.1 60.4 79.7
Gas [Member] | Retail - industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1.7 2.0 5.9 7.4
Gas [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 8.9 11.9 20.7 26.9
Other Utility [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 10.1 10.9 21.7 22.0
Other Utility [Member] | Steam [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 8.6 9.2 18.6 17.6
Other Utility [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1.5 1.7 3.1 4.4
Non-utility and Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 18.9 22.9 40.5 39.8
Non-utility and Other [Member] | Transportation and other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 18.9 22.9 40.5 39.8
IPL [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 431.9 441.2 950.8 996.3
IPL [Member] | Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 388.4 392.3 813.2 812.1
IPL [Member] | Electric [Member] | Retail - residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 135.3 125.9 282.7 273.4
IPL [Member] | Electric [Member] | Retail - commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 109.0 111.4 228.7 228.0
IPL [Member] | Electric [Member] | Retail - industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 114.3 118.4 235.5 234.5
IPL [Member] | Electric [Member] | Wholesale [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 13.0 14.6 27.4 31.5
IPL [Member] | Electric [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 16.8 22.0 38.9 44.7
IPL [Member] | Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 33.9 38.4 116.9 163.0
IPL [Member] | Gas [Member] | Retail - residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 18.5 20.0 67.3 97.9
IPL [Member] | Gas [Member] | Retail - commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 8.3 8.8 32.4 43.6
IPL [Member] | Gas [Member] | Retail - industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1.3 1.6 3.6 4.8
IPL [Member] | Gas [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 5.8 8.0 13.6 16.7
IPL [Member] | Other Utility [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 9.6 10.5 20.7 21.2
IPL [Member] | Other Utility [Member] | Steam [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 8.6 9.2 18.6 17.6
IPL [Member] | Other Utility [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1.0 1.3 2.1 3.6
WPL [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 312.3 326.1 687.5 741.3
WPL [Member] | Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 286.8 298.9 592.3 622.5
WPL [Member] | Electric [Member] | Retail - residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 114.4 107.4 233.8 234.6
WPL [Member] | Electric [Member] | Retail - commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 55.0 59.9 117.6 124.4
WPL [Member] | Electric [Member] | Retail - industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 83.0 95.8 171.7 188.4
WPL [Member] | Electric [Member] | Wholesale [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 26.1 26.4 52.6 56.0
WPL [Member] | Electric [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 8.3 9.4 16.6 19.1
WPL [Member] | Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 25.0 26.8 94.2 118.0
WPL [Member] | Gas [Member] | Retail - residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 15.1 15.2 56.8 69.1
WPL [Member] | Gas [Member] | Retail - commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 6.4 7.3 28.0 36.1
WPL [Member] | Gas [Member] | Retail - industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0.4 0.4 2.3 2.6
WPL [Member] | Gas [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3.1 3.9 7.1 10.2
WPL [Member] | Other Utility [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0.5 0.4 1.0 0.8
WPL [Member] | Other Utility [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 0.5 $ 0.4 $ 1.0 $ 0.8