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Debt | 3 Months Ended
--- | ---
Mar. 31, 2013
Debt Instrument [Line Items] |
Debt | DEBT (a) Short-term Debt - Information regarding commercial paper classified as short-term debt and back-stopped by Alliant Energy’s, IPL’s and WPL’s credit facilities was as follows (dollars in millions):
| Alliant Energy |  | Parent |  |  |  |
March 31, 2013 | (Consolidated) |  | Company |  | IPL |  | WPL
Commercial paper: |  |  |  |  |  |  |
Amount outstanding | $243.4 |  | $83.4 |  | $— |  | $160.0
Weighted average remaining maturity | 3 days |  | 2 days |  | N/A |  | 3 days
Weighted average interest rates | 0.2% |  | 0.3% |  | N/A |  | 0.2%
Available credit facility capacity (a) | $721.6 |  | $216.6 |  | $265.0 |  | $240.0
| Alliant Energy |  | IPL |  | WPL
Three Months Ended March 31 | 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012
Maximum amount outstanding (based on daily outstanding balances) |  | $243.4 |  |  |  | $102.8 |  |  |  | $26.3 |  |  |  | $35.4 |  |  |  | $160.0 |  |  |  | $32.7 |
Average amount outstanding (based on daily outstanding balances) |  | $170.8 |  |  |  | $66.4 |  |  |  | $4.8 |  |  |  | $12.8 |  |  |  | $72.9 |  |  |  | $13.1 |
Weighted average interest rates | 0.3 | % |  | 0.3 | % |  | 0.4 | % |  | 0.4 | % |  | 0.2 | % |  | 0.2 | %
(a) | Alliant Energy’s and IPL’s available credit facility capacities reflect outstanding commercial paper classified as both short- and long-term debt at March 31, 2013. Refer to Note 8(b) for further discussion of $35 million of commercial paper outstanding at March 31, 2013 classified as long-term debt on Alliant Energy’s and IPL’s Condensed Consolidated Balance Sheets.
(b) Long-term Debt - As of March 31, 2013, $35 million of commercial paper was recorded in “Long-term debt, net” on Alliant Energy’s and IPL’s Condensed 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. As of March 31, 2013, this commercial paper balance had a remaining maturity of 3 days and a 0.3% interest rate.
IPL [Member] |
Debt Instrument [Line Items] |
Debt | DEBT (a) Short-term Debt - Information regarding commercial paper classified as short-term debt and back-stopped by Alliant Energy’s, IPL’s and WPL’s credit facilities was as follows (dollars in millions):
| Alliant Energy |  | Parent |  |  |  |
March 31, 2013 | (Consolidated) |  | Company |  | IPL |  | WPL
Commercial paper: |  |  |  |  |  |  |
Amount outstanding | $243.4 |  | $83.4 |  | $— |  | $160.0
Weighted average remaining maturity | 3 days |  | 2 days |  | N/A |  | 3 days
Weighted average interest rates | 0.2% |  | 0.3% |  | N/A |  | 0.2%
Available credit facility capacity (a) | $721.6 |  | $216.6 |  | $265.0 |  | $240.0
| Alliant Energy |  | IPL |  | WPL
Three Months Ended March 31 | 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012
Maximum amount outstanding (based on daily outstanding balances) |  | $243.4 |  |  |  | $102.8 |  |  |  | $26.3 |  |  |  | $35.4 |  |  |  | $160.0 |  |  |  | $32.7 |
Average amount outstanding (based on daily outstanding balances) |  | $170.8 |  |  |  | $66.4 |  |  |  | $4.8 |  |  |  | $12.8 |  |  |  | $72.9 |  |  |  | $13.1 |
Weighted average interest rates | 0.3 | % |  | 0.3 | % |  | 0.4 | % |  | 0.4 | % |  | 0.2 | % |  | 0.2 | %
(a) | Alliant Energy’s and IPL’s available credit facility capacities reflect outstanding commercial paper classified as both short- and long-term debt at March 31, 2013. Refer to Note 8(b) for further discussion of $35 million of commercial paper outstanding at March 31, 2013 classified as long-term debt on Alliant Energy’s and IPL’s Condensed Consolidated Balance Sheets.
(b) Long-term Debt - As of March 31, 2013, $35 million of commercial paper was recorded in “Long-term debt, net” on Alliant Energy’s and IPL’s Condensed 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. As of March 31, 2013, this commercial paper balance had a remaining maturity of 3 days and a 0.3% interest rate.
WPL [Member] |
Debt Instrument [Line Items] |
Debt | DEBT (a) Short-term Debt - Information regarding commercial paper classified as short-term debt and back-stopped by Alliant Energy’s, IPL’s and WPL’s credit facilities was as follows (dollars in millions):
| Alliant Energy |  | Parent |  |  |  |
March 31, 2013 | (Consolidated) |  | Company |  | IPL |  | WPL
Commercial paper: |  |  |  |  |  |  |
Amount outstanding | $243.4 |  | $83.4 |  | $— |  | $160.0
Weighted average remaining maturity | 3 days |  | 2 days |  | N/A |  | 3 days
Weighted average interest rates | 0.2% |  | 0.3% |  | N/A |  | 0.2%
Available credit facility capacity (a) | $721.6 |  | $216.6 |  | $265.0 |  | $240.0
| Alliant Energy |  | IPL |  | WPL
Three Months Ended March 31 | 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012
Maximum amount outstanding (based on daily outstanding balances) |  | $243.4 |  |  |  | $102.8 |  |  |  | $26.3 |  |  |  | $35.4 |  |  |  | $160.0 |  |  |  | $32.7 |
Average amount outstanding (based on daily outstanding balances) |  | $170.8 |  |  |  | $66.4 |  |  |  | $4.8 |  |  |  | $12.8 |  |  |  | $72.9 |  |  |  | $13.1 |
Weighted average interest rates | 0.3 | % |  | 0.3 | % |  | 0.4 | % |  | 0.4 | % |  | 0.2 | % |  | 0.2 | %
(a) | Alliant Energy’s and IPL’s available credit facility capacities reflect outstanding commercial paper classified as both short- and long-term debt at March 31, 2013. Refer to Note 8(b) for further discussion of $35 million of commercial paper outstanding at March 31, 2013 classified as long-term debt on Alliant Energy’s and IPL’s Condensed Consolidated Balance Sheets.
(b) Long-term Debt - As of March 31, 2013, $35 million of commercial paper was recorded in “Long-term debt, net” on Alliant Energy’s and IPL’s Condensed 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. As of March 31, 2013, this commercial paper balance had a remaining maturity of 3 days and a 0.3% interest rate.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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