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Debt (Tables) | 6 Months Ended
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Jun. 30, 2013
Debt Disclosure [Line Items] |
Other Short-Term Borrowings | 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 |  |  |  |
June 30, 2013 | (Consolidated) |  | Company |  | IPL |  | WPL
Commercial paper: |  |  |  |  |  |  |
Amount outstanding | $223.1 |  | $74.2 |  | $— |  | $148.9
Weighted average remaining maturity | 2 days |  | 2 days |  | N/A |  | 2 days
Weighted average interest rates | 0.2% |  | 0.3% |  | N/A |  | 0.2%
Available credit facility capacity (a) | $721.9 |  | $225.8 |  | $245.0 |  | $251.1
| Alliant Energy |  | IPL |  | WPL
Three Months Ended June 30 | 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012
Maximum amount outstanding (based on daily outstanding balances) |  | $223.1 |  |  |  | $162.8 |  |  |  | $6.0 |  |  |  | $30.3 |  |  |  | $159.4 |  |  |  | $35.6 |
Average amount outstanding (based on daily outstanding balances) |  | $191.4 |  |  |  | $100.8 |  |  |  | $0.2 |  |  |  | $7.6 |  |  |  | $125.7 |  |  |  | $14.9 |
Weighted average interest rates | 0.2 | % |  | 0.4 | % |  | 0.3 | % |  | 0.4 | % |  | 0.2 | % |  | 0.3 | %
Six Months Ended June 30 |  |  |  |  |  |  |  |  |  |  |
Maximum amount outstanding (based on daily outstanding balances) |  | $243.4 |  |  |  | $162.8 |  |  |  | $26.3 |  |  |  | $35.4 |  |  |  | $160.0 |  |  |  | $35.6 |
Average amount outstanding (based on daily outstanding balances) |  | $181.2 |  |  |  | $83.6 |  |  |  | $2.5 |  |  |  | $10.2 |  |  |  | $99.4 |  |  |  | $14.0 |
Weighted average interest rates | 0.3 | % |  | 0.4 | % |  | 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 June 30, 2013. Refer to Note 8(b) for further discussion of $55 million of commercial paper outstanding at June 30, 2013 classified as long-term debt on Alliant Energy’s and IPL’s Condensed Consolidated Balance Sheets.
IPL [Member] |
Debt Disclosure [Line Items] |
Other Short-Term Borrowings | 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 |  |  |  |
June 30, 2013 | (Consolidated) |  | Company |  | IPL |  | WPL
Commercial paper: |  |  |  |  |  |  |
Amount outstanding | $223.1 |  | $74.2 |  | $— |  | $148.9
Weighted average remaining maturity | 2 days |  | 2 days |  | N/A |  | 2 days
Weighted average interest rates | 0.2% |  | 0.3% |  | N/A |  | 0.2%
Available credit facility capacity (a) | $721.9 |  | $225.8 |  | $245.0 |  | $251.1
| Alliant Energy |  | IPL |  | WPL
Three Months Ended June 30 | 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012
Maximum amount outstanding (based on daily outstanding balances) |  | $223.1 |  |  |  | $162.8 |  |  |  | $6.0 |  |  |  | $30.3 |  |  |  | $159.4 |  |  |  | $35.6 |
Average amount outstanding (based on daily outstanding balances) |  | $191.4 |  |  |  | $100.8 |  |  |  | $0.2 |  |  |  | $7.6 |  |  |  | $125.7 |  |  |  | $14.9 |
Weighted average interest rates | 0.2 | % |  | 0.4 | % |  | 0.3 | % |  | 0.4 | % |  | 0.2 | % |  | 0.3 | %
Six Months Ended June 30 |  |  |  |  |  |  |  |  |  |  |
Maximum amount outstanding (based on daily outstanding balances) |  | $243.4 |  |  |  | $162.8 |  |  |  | $26.3 |  |  |  | $35.4 |  |  |  | $160.0 |  |  |  | $35.6 |
Average amount outstanding (based on daily outstanding balances) |  | $181.2 |  |  |  | $83.6 |  |  |  | $2.5 |  |  |  | $10.2 |  |  |  | $99.4 |  |  |  | $14.0 |
Weighted average interest rates | 0.3 | % |  | 0.4 | % |  | 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 June 30, 2013. Refer to Note 8(b) for further discussion of $55 million of commercial paper outstanding at June 30, 2013 classified as long-term debt on Alliant Energy’s and IPL’s Condensed Consolidated Balance Sheets.
WPL [Member] |
Debt Disclosure [Line Items] |
Other Short-Term Borrowings | 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 |  |  |  |
June 30, 2013 | (Consolidated) |  | Company |  | IPL |  | WPL
Commercial paper: |  |  |  |  |  |  |
Amount outstanding | $223.1 |  | $74.2 |  | $— |  | $148.9
Weighted average remaining maturity | 2 days |  | 2 days |  | N/A |  | 2 days
Weighted average interest rates | 0.2% |  | 0.3% |  | N/A |  | 0.2%
Available credit facility capacity (a) | $721.9 |  | $225.8 |  | $245.0 |  | $251.1
| Alliant Energy |  | IPL |  | WPL
Three Months Ended June 30 | 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012
Maximum amount outstanding (based on daily outstanding balances) |  | $223.1 |  |  |  | $162.8 |  |  |  | $6.0 |  |  |  | $30.3 |  |  |  | $159.4 |  |  |  | $35.6 |
Average amount outstanding (based on daily outstanding balances) |  | $191.4 |  |  |  | $100.8 |  |  |  | $0.2 |  |  |  | $7.6 |  |  |  | $125.7 |  |  |  | $14.9 |
Weighted average interest rates | 0.2 | % |  | 0.4 | % |  | 0.3 | % |  | 0.4 | % |  | 0.2 | % |  | 0.3 | %
Six Months Ended June 30 |  |  |  |  |  |  |  |  |  |  |
Maximum amount outstanding (based on daily outstanding balances) |  | $243.4 |  |  |  | $162.8 |  |  |  | $26.3 |  |  |  | $35.4 |  |  |  | $160.0 |  |  |  | $35.6 |
Average amount outstanding (based on daily outstanding balances) |  | $181.2 |  |  |  | $83.6 |  |  |  | $2.5 |  |  |  | $10.2 |  |  |  | $99.4 |  |  |  | $14.0 |
Weighted average interest rates | 0.3 | % |  | 0.4 | % |  | 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 June 30, 2013. Refer to Note 8(b) for further discussion of $55 million of commercial paper outstanding at June 30, 2013 classified as long-term debt on Alliant Energy’s and IPL’s Condensed Consolidated Balance Sheets.

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- Definition Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -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 210.5-02.19) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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