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Benefit Plans (Amounts Recognized On The Consolidated Balance Sheets) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Amounts recognized on the Consolidated Balance Sheets consist of:    
Pension and other benefit obligations $ (206.6) $ (364.0)
Amounts recognized in Regulatory Assets, Regulatory Liabilities and AOCL consist of (a):    
Regulatory liability recognized related to other postretirement benefit plans 5.1 2.7
Pension Plans, Defined Benefit [Member]
    
Amounts recognized on the Consolidated Balance Sheets consist of:    
Non-current assets 0 0
Other current liabilities (2.4) (2.4)
Pension and other benefit obligations (88.1) (239.5)
Net amount recognized at December 31 (90.5) (241.9)
Amounts recognized in Regulatory Assets, Regulatory Liabilities and AOCL consist of (a):    
Net actuarial loss 348.6 [1] 533.4 [1]
Prior service credit (7.4) [1] (7.2) [1]
Net amount recognized at December 31 341.2 [1] 526.2 [1]
Other Postretirement Benefits Plans [Member]
    
Amounts recognized on the Consolidated Balance Sheets consist of:    
Non-current assets 14.5 3.5
Other current liabilities (4.8) (2.8)
Pension and other benefit obligations (93.5) (100.8)
Net amount recognized at December 31 (83.8) (100.1)
Amounts recognized in Regulatory Assets, Regulatory Liabilities and AOCL consist of (a):    
Net actuarial loss 38.1 [1] 62.1 [1]
Prior service credit (28.6) [1] (40.5) [1]
Net amount recognized at December 31 9.5 [1] 21.6 [1]
IPL [Member]
    
Amounts recognized on the Consolidated Balance Sheets consist of:    
Pension and other benefit obligations (48.6) (122.9)
Amounts recognized in Regulatory Assets, Regulatory Liabilities and AOCL consist of (a):    
Regulatory liability recognized related to other postretirement benefit plans 1.0 1.4
IPL [Member] | Pension Plans, Defined Benefit [Member]
    
Amounts recognized on the Consolidated Balance Sheets consist of:    
Non-current assets 0 0
Other current liabilities (0.8) (0.8)
Pension and other benefit obligations (27.3) (99.6)
Net amount recognized at December 31 (28.1) (100.4)
Amounts recognized in Regulatory Assets, Regulatory Liabilities and AOCL consist of (a):    
Net actuarial loss 146.1 [2] 231.6 [2]
Prior service credit (2.6) [2] (2.5) [2]
Net amount recognized at December 31 143.5 [2] 229.1 [2]
IPL [Member] | Other Postretirement Benefits Plans [Member]
    
Amounts recognized on the Consolidated Balance Sheets consist of:    
Non-current assets 8.8 0
Other current liabilities 0 0
Pension and other benefit obligations (15.4) (17.2)
Net amount recognized at December 31 (6.6) (17.2)
Amounts recognized in Regulatory Assets, Regulatory Liabilities and AOCL consist of (a):    
Net actuarial loss 18.2 [2] 32.0 [2]
Prior service credit (15.0) [2] (21.3) [2]
Net amount recognized at December 31 3.2 [2] 10.7 [2]
WPL [Member]
    
Amounts recognized on the Consolidated Balance Sheets consist of:    
Pension and other benefit obligations (88.4) (159.7)
Amounts recognized in Regulatory Assets, Regulatory Liabilities and AOCL consist of (a):    
Regulatory liability recognized related to other postretirement benefit plans 1.1 0.2
WPL [Member] | Pension Plans, Defined Benefit [Member]
    
Amounts recognized on the Consolidated Balance Sheets consist of:    
Non-current assets 0 0
Other current liabilities (0.2) (0.2)
Pension and other benefit obligations (21.8) (91.1)
Net amount recognized at December 31 (22.0) (91.3)
Amounts recognized in Regulatory Assets, Regulatory Liabilities and AOCL consist of (a):    
Net actuarial loss 152.2 [3] 233.7 [3]
Prior service credit (0.7) [3] (0.4) [3]
Net amount recognized at December 31 151.5 [3] 233.3 [3]
WPL [Member] | Other Postretirement Benefits Plans [Member]
    
Amounts recognized on the Consolidated Balance Sheets consist of:    
Non-current assets 5.8 3.5
Other current liabilities (4.8) (2.8)
Pension and other benefit obligations (64.9) (67.5)
Net amount recognized at December 31 (63.9) (66.8)
Amounts recognized in Regulatory Assets, Regulatory Liabilities and AOCL consist of (a):    
Net actuarial loss 18.3 [3] 24.3 [3]
Prior service credit (9.5) [3] (13.4) [3]
Net amount recognized at December 31 $ 8.8 [3] $ 10.9 [3]
[1] Refer to Note 2 and Alliant Energy’s Consolidated Statements of Common Equity for amounts recognized in “Regulatory assets” and “AOCL,” respectively, on Alliant Energy’s Consolidated Balance Sheets. At December 31, 2013 and 2012, $5.1 million and $2.7 million, respectively, of regulatory liabilities were recognized related to Alliant Energy’s other postretirement benefits plans.
[2] Refer to Note 2 for amounts recognized in “Regulatory assets” on IPL’s Consolidated Balance Sheets. At December 31, 2013 and 2012, $1.0 million and $1.4 million, respectively, of regulatory liabilities were recognized related to IPL’s other postretirement benefits plans.
[3] Refer to Note 2 for amounts recognized in “Regulatory assets” on WPL’s Consolidated Balance Sheets. At December 31, 2013 and 2012, $1.1 million and $0.2 million, respectively, of regulatory liabilities were recognized related to WPL’s other postretirement benefits plans.