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Debt (Long-term Debt) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Senior Debentures [Member]
Dec. 31, 2012
Senior Debentures [Member]
Dec. 31, 2013
Senior Debentures [Member]
3.3% senior debenture, due 2015 [Member]
Dec. 31, 2012
Senior Debentures [Member]
3.3% senior debenture, due 2015 [Member]
Dec. 31, 2013
Senior Debentures [Member]
5.875% senior debenture, due 2018 [Member]
Dec. 31, 2012
Senior Debentures [Member]
5.875% senior debenture, due 2018 [Member]
Dec. 31, 2013
Senior Debentures [Member]
7.25% senior debenture, due 2018 [Member]
Dec. 31, 2012
Senior Debentures [Member]
7.25% senior debenture, due 2018 [Member]
Dec. 31, 2013
Senior Debentures [Member]
3.65% senior debenture, due 2020 [Member]
Dec. 31, 2012
Senior Debentures [Member]
3.65% senior debenture, due 2020 [Member]
Dec. 31, 2013
Senior Debentures [Member]
5.5% senior debenture, due 2025 [Member]
Dec. 31, 2012
Senior Debentures [Member]
5.5% senior debenture, due 2025 [Member]
Dec. 31, 2013
Senior Debentures [Member]
6.45% senior debenture, due 2033 [Member]
Dec. 31, 2012
Senior Debentures [Member]
6.45% senior debenture, due 2033 [Member]
Dec. 31, 2013
Senior Debentures [Member]
6.3% senior debenture, due 2034 [Member]
Dec. 31, 2012
Senior Debentures [Member]
6.3% senior debenture, due 2034 [Member]
Dec. 31, 2013
Senior Debentures [Member]
6.25% senior debenture, due 2039 [Member]
Dec. 31, 2012
Senior Debentures [Member]
6.25% senior debenture, due 2039 [Member]
Dec. 31, 2013
Senior Debentures [Member]
4.7% senior debenture, due 2043 [Member]
Dec. 31, 2012
Senior Debentures [Member]
4.7% senior debenture, due 2043 [Member]
Dec. 31, 2013
Debentures [Member]
Dec. 31, 2012
Debentures [Member]
Dec. 31, 2013
Debentures [Member]
5% debenture, due 2019 [Member]
Dec. 31, 2012
Debentures [Member]
5% debenture, due 2019 [Member]
Dec. 31, 2013
Debentures [Member]
4.6% debenture, due 2020 [Member]
Dec. 31, 2012
Debentures [Member]
4.6% debenture, due 2020 [Member]
Dec. 31, 2013
Debentures [Member]
2.25% debenture, due 2022 [Member]
Dec. 31, 2012
Debentures [Member]
2.25% debenture, due 2022 [Member]
Dec. 31, 2013
Debentures [Member]
6.25% debenture, due 2034 [Member]
Dec. 31, 2012
Debentures [Member]
6.25% debenture, due 2034 [Member]
Dec. 31, 2013
Debentures [Member]
6.375% debenture, due 2037 [Member]
Dec. 31, 2012
Debentures [Member]
6.375% debenture, due 2037 [Member]
Dec. 31, 2013
Debentures [Member]
7.6% debenture, due 2038 [Member]
Dec. 31, 2012
Debentures [Member]
7.6% debenture, due 2038 [Member]
Dec. 31, 2013
Pollution Control Revenue Bonds [Member]
Dec. 31, 2012
Pollution Control Revenue Bonds [Member]
Dec. 31, 2013
Pollution Control Revenue Bonds [Member]
5% pollution control revenue bond, due 2014 [Member]
Dec. 31, 2012
Pollution Control Revenue Bonds [Member]
5% pollution control revenue bond, due 2014 [Member]
Dec. 31, 2013
Pollution Control Revenue Bonds [Member]
5% pollution control revenue bond, due 2014 and 2015 [Member]
Dec. 31, 2012
Pollution Control Revenue Bonds [Member]
5% pollution control revenue bond, due 2014 and 2015 [Member]
Dec. 31, 2013
Pollution Control Revenue Bonds [Member]
5.375% pollution control revenue bond, due 2015 [Member]
Dec. 31, 2012
Pollution Control Revenue Bonds [Member]
5.375% pollution control revenue bond, due 2015 [Member]
Dec. 31, 2013
Other Long Term Debt [Member]
Dec. 31, 2012
Other Long Term Debt [Member]
Mar. 31, 2013
Long-term debt [Member]
Dec. 31, 2013
Long-term debt [Member]
Dec. 31, 2012
Long-term debt [Member]
Dec. 31, 2013
Senior Notes [Member]
4% senior notes, due 2014 [Member]
Dec. 31, 2012
Senior Notes [Member]
4% senior notes, due 2014 [Member]
Dec. 31, 2013
Senior Notes [Member]
3.45% senior notes, due 2022 [Member]
Dec. 31, 2012
Senior Notes [Member]
3.45% senior notes, due 2022 [Member]
Dec. 31, 2013
Term Loan Credit Agreement [Member]
Term loan credit agreement through 2014, 1% at December 31, 2013 [Member]
Dec. 31, 2012
Term Loan Credit Agreement [Member]
Term loan credit agreement through 2014, 1% at December 31, 2013 [Member]
Dec. 31, 2013
Senior Secured Notes [Member]
5.06% senior secured notes, due 2014 to 2024 [Member]
Dec. 31, 2012
Senior Secured Notes [Member]
5.06% senior secured notes, due 2014 to 2024 [Member]
Dec. 31, 2013
Other [Member]
Other, 1% at December 31, 2013, due 2014 to 2025 [Member]
Dec. 31, 2012
Other [Member]
Other, 1% at December 31, 2013, due 2014 to 2025 [Member]
Dec. 31, 2013
IPL [Member]
Dec. 31, 2012
IPL [Member]
Dec. 31, 2011
IPL [Member]
Dec. 31, 2013
IPL [Member]
Senior Debentures [Member]
Dec. 31, 2012
IPL [Member]
Senior Debentures [Member]
Dec. 31, 2013
IPL [Member]
Senior Debentures [Member]
3.3% senior debenture, due 2015 [Member]
Dec. 31, 2012
IPL [Member]
Senior Debentures [Member]
3.3% senior debenture, due 2015 [Member]
Dec. 31, 2013
IPL [Member]
Senior Debentures [Member]
5.875% senior debenture, due 2018 [Member]
Dec. 31, 2012
IPL [Member]
Senior Debentures [Member]
5.875% senior debenture, due 2018 [Member]
Dec. 31, 2013
IPL [Member]
Senior Debentures [Member]
7.25% senior debenture, due 2018 [Member]
Dec. 31, 2012
IPL [Member]
Senior Debentures [Member]
7.25% senior debenture, due 2018 [Member]
Dec. 31, 2013
IPL [Member]
Senior Debentures [Member]
3.65% senior debenture, due 2020 [Member]
Dec. 31, 2012
IPL [Member]
Senior Debentures [Member]
3.65% senior debenture, due 2020 [Member]
Dec. 31, 2013
IPL [Member]
Senior Debentures [Member]
5.5% senior debenture, due 2025 [Member]
Dec. 31, 2012
IPL [Member]
Senior Debentures [Member]
5.5% senior debenture, due 2025 [Member]
Dec. 31, 2013
IPL [Member]
Senior Debentures [Member]
6.45% senior debenture, due 2033 [Member]
Dec. 31, 2012
IPL [Member]
Senior Debentures [Member]
6.45% senior debenture, due 2033 [Member]
Dec. 31, 2013
IPL [Member]
Senior Debentures [Member]
6.3% senior debenture, due 2034 [Member]
Dec. 31, 2012
IPL [Member]
Senior Debentures [Member]
6.3% senior debenture, due 2034 [Member]
Dec. 31, 2013
IPL [Member]
Senior Debentures [Member]
6.25% senior debenture, due 2039 [Member]
Dec. 31, 2012
IPL [Member]
Senior Debentures [Member]
6.25% senior debenture, due 2039 [Member]
Dec. 31, 2013
IPL [Member]
Senior Debentures [Member]
4.7% senior debenture, due 2043 [Member]
Dec. 31, 2012
IPL [Member]
Senior Debentures [Member]
4.7% senior debenture, due 2043 [Member]
Dec. 31, 2013
IPL [Member]
Pollution Control Revenue Bonds [Member]
Dec. 31, 2012
IPL [Member]
Pollution Control Revenue Bonds [Member]
Dec. 31, 2013
IPL [Member]
Pollution Control Revenue Bonds [Member]
5% pollution control revenue bond, due 2014 [Member]
Dec. 31, 2012
IPL [Member]
Pollution Control Revenue Bonds [Member]
5% pollution control revenue bond, due 2014 [Member]
Dec. 31, 2013
IPL [Member]
Other Long Term Debt [Member]
Dec. 31, 2012
IPL [Member]
Other Long Term Debt [Member]
Dec. 31, 2013
IPL [Member]
Long-term debt [Member]
Dec. 31, 2012
IPL [Member]
Long-term debt [Member]
Dec. 31, 2013
WPL [Member]
Dec. 31, 2012
WPL [Member]
Dec. 31, 2011
WPL [Member]
Dec. 31, 2013
WPL [Member]
Debentures [Member]
Dec. 31, 2012
WPL [Member]
Debentures [Member]
Dec. 31, 2013
WPL [Member]
Debentures [Member]
5% debenture, due 2019 [Member]
Dec. 31, 2012
WPL [Member]
Debentures [Member]
5% debenture, due 2019 [Member]
Dec. 31, 2013
WPL [Member]
Debentures [Member]
4.6% debenture, due 2020 [Member]
Dec. 31, 2012
WPL [Member]
Debentures [Member]
4.6% debenture, due 2020 [Member]
Dec. 31, 2013
WPL [Member]
Debentures [Member]
2.25% debenture, due 2022 [Member]
Dec. 31, 2012
WPL [Member]
Debentures [Member]
2.25% debenture, due 2022 [Member]
Dec. 31, 2013
WPL [Member]
Debentures [Member]
6.25% debenture, due 2034 [Member]
Dec. 31, 2012
WPL [Member]
Debentures [Member]
6.25% debenture, due 2034 [Member]
Dec. 31, 2013
WPL [Member]
Debentures [Member]
6.375% debenture, due 2037 [Member]
Dec. 31, 2012
WPL [Member]
Debentures [Member]
6.375% debenture, due 2037 [Member]
Dec. 31, 2013
WPL [Member]
Debentures [Member]
7.6% debenture, due 2038 [Member]
Dec. 31, 2012
WPL [Member]
Debentures [Member]
7.6% debenture, due 2038 [Member]
Dec. 31, 2013
WPL [Member]
Pollution Control Revenue Bonds [Member]
Dec. 31, 2012
WPL [Member]
Pollution Control Revenue Bonds [Member]
Dec. 31, 2013
WPL [Member]
Pollution Control Revenue Bonds [Member]
5% pollution control revenue bond, due 2014 and 2015 [Member]
Dec. 31, 2012
WPL [Member]
Pollution Control Revenue Bonds [Member]
5% pollution control revenue bond, due 2014 and 2015 [Member]
Dec. 31, 2013
WPL [Member]
Pollution Control Revenue Bonds [Member]
5.375% pollution control revenue bond, due 2015 [Member]
Dec. 31, 2012
WPL [Member]
Pollution Control Revenue Bonds [Member]
5.375% pollution control revenue bond, due 2015 [Member]
Debt Instrument [Line Items]                                                                                                                                                                                                                                    
Long-term debt, carrying value $ 3,348.4 $ 3,149.9   $ 1,525.0 $ 1,275.0 $ 150.0 $ 150.0 $ 100.0 $ 100.0 $ 250.0 $ 250.0 $ 200.0 $ 200.0 $ 50.0 $ 50.0 $ 100.0 $ 100.0 $ 125.0 $ 125.0 $ 300.0 $ 300.0 $ 250.0 [1] $ 0 [1] $ 1,300.0 $ 1,300.0 $ 250.0 $ 250.0 $ 150.0 $ 150.0 $ 250.0 $ 250.0 $ 100.0 $ 100.0 $ 300.0 $ 300.0 $ 250.0 $ 250.0 $ 77.5 $ 77.5 $ 38.4 $ 38.4 $ 24.5 $ 24.5 $ 14.6 $ 14.6 $ 445.9 $ 497.4       $ 250.0 $ 250.0 $ 75.0 $ 75.0 $ 60.0 $ 60.0 $ 60.5 $ 61.9 $ 0.4 $ 0.5 $ 1,563.4 $ 1,363.4   $ 1,525.0 $ 1,275.0 $ 150.0 $ 150.0 $ 100.0 $ 100.0 $ 250.0 $ 250.0 $ 200.0 $ 200.0 $ 50.0 $ 50.0 $ 100.0 $ 100.0 $ 125.0 $ 125.0 $ 300.0 $ 300.0 $ 250.0 [1] $ 0 [1] $ 38.4 $ 38.4 $ 38.4 $ 38.4 $ 0 $ 50.0     $ 1,339.1 $ 1,339.1   $ 1,300.0 $ 1,300.0 $ 250.0 $ 250.0 $ 150.0 $ 150.0 $ 250.0 $ 250.0 $ 100.0 $ 100.0 $ 300.0 $ 300.0 $ 250.0 $ 250.0 $ 39.1 $ 39.1 $ 24.5 $ 24.5 $ 14.6 $ 14.6
Reduction in commercial paper 11.9 164.7 55.4                                                                                         65.0                         (76.3) 69.2 7.1                                                         97.1 60.9 (21.7)                                        
Commercial paper 279.4 217.5                                                                                             0 [2] 50.0 [2]                     0 26.3                                                       0 [2] 50.0 [2] 183.7 86.6                                          
Current maturities (358.5) (1.5)                                                                                                                     (38.4) 0                                                           (8.5) 0                                          
Unamortized debt (discount) and premium, net (12.1) (11.8)                                                                                                                     (5.0) (3.9)                                                           (7.0) (7.6)                                          
Long-term debt, net $ 2,977.8 $ 3,136.6                                                                                                                     $ 1,520.0 $ 1,359.5                                                           $ 1,323.6 $ 1,331.5                                          
Interest rate           3.30%   5.875%   7.25%   3.65%   5.50%   6.45%   6.30%   6.25%   4.70%       5.00%   4.60%   2.25%   6.25%   6.375%   7.60%       5.00%   5.00%   5.375%           0.40% 4.00%   3.45%   1.00%   5.06%   1.00%             3.30%   5.875%   7.25%   3.65%   5.50%   6.45%   6.30%   6.25%   4.70%       5.00%       0.40%             5.00%   4.60%   2.25%   6.25%   6.375%   7.60%       5.00%   5.375%  
[1] In 2013, IPL issued $250.0 million of 4.7% senior debentures due 2043. The proceeds from the issuance were used by IPL to reduce cash proceeds received from its sales of accounts receivable program, reduce commercial paper classified as long-term debt by $65 million and for general working capital purposes.
[2] At December 31, 2012, $50.0 million of commercial paper was recorded in “Long-term debt, net” on Alliant Energy’s and IPL’s Consolidated Balance Sheets due to the existence of long-term credit facilities that back-stop this commercial paper balance, along with Alliant Energy’s and IPL’s intent and ability to refinance these balances on a long-term basis.