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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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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.

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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