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Receivables (Tables) | 6 Months Ended
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Jun. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Maximum And Average Outstanding Cash Proceeds | IPL’s maximum and average outstanding cash proceeds, and costs incurred related to the sales of accounts receivable program for the three and six months ended June 30 were as follows (in millions):
| Three Months |  | Six Months
| 2013 |  | 2012 |  | 2013 |  | 2012
Maximum outstanding aggregate cash proceeds (based on daily outstanding balances) | $150.0 |  | $150.0 |  | $170.0 |  | $160.0
Average outstanding aggregate cash proceeds (based on daily outstanding balances) | 125.6 |  | 135.1 |  | 132.4 |  | 139.0
Costs incurred | 0.4 |  | 0.3 |  | 0.7 |  | 0.7
Receivables Sold Under The Agreement | The attributes of IPL’s receivables sold under the Agreement were as follows (in millions):
| June 30, 2013 |  | December 31, 2012
Customer accounts receivable | $128.2 |  | $118.2
Unbilled utility revenues | 78.0 |  | 77.4
Other receivables | 0.1 |  | 2.8
Receivables sold | 206.3 |  | 198.4
Less: cash proceeds (a) | 135.0 |  | 130.0
Deferred proceeds | 71.3 |  | 68.4
Less: allowance for doubtful accounts | 2.0 |  | 1.6
Fair value of deferred proceeds | $69.3 |  | $66.8
Outstanding receivables past due | $19.1 |  | $16.1
(a) | Changes in cash proceeds are recorded in “Sales of accounts receivable” in operating activities in Alliant Energy’s and IPL’s Condensed Consolidated Statements of Cash Flows.
Additional Attributes Of Receivables Sold Under The Agreement | Additional attributes of IPL’s receivables sold under the Agreement for the three and six months ended June 30 were as follows (in millions):
| Three Months |  | Six Months
| 2013 |  | 2012 |  | 2013 |  | 2012
Collections reinvested in receivables | $435.0 |  | $369.5 |  | $926.3 |  | $811.8
Credit losses, net of recoveries | 2.0 |  | 2.2 |  | 3.9 |  | 4.3
IPL [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Maximum And Average Outstanding Cash Proceeds | IPL’s maximum and average outstanding cash proceeds, and costs incurred related to the sales of accounts receivable program for the three and six months ended June 30 were as follows (in millions):
| Three Months |  | Six Months
| 2013 |  | 2012 |  | 2013 |  | 2012
Maximum outstanding aggregate cash proceeds (based on daily outstanding balances) | $150.0 |  | $150.0 |  | $170.0 |  | $160.0
Average outstanding aggregate cash proceeds (based on daily outstanding balances) | 125.6 |  | 135.1 |  | 132.4 |  | 139.0
Costs incurred | 0.4 |  | 0.3 |  | 0.7 |  | 0.7
Receivables Sold Under The Agreement | The attributes of IPL’s receivables sold under the Agreement were as follows (in millions):
| June 30, 2013 |  | December 31, 2012
Customer accounts receivable | $128.2 |  | $118.2
Unbilled utility revenues | 78.0 |  | 77.4
Other receivables | 0.1 |  | 2.8
Receivables sold | 206.3 |  | 198.4
Less: cash proceeds (a) | 135.0 |  | 130.0
Deferred proceeds | 71.3 |  | 68.4
Less: allowance for doubtful accounts | 2.0 |  | 1.6
Fair value of deferred proceeds | $69.3 |  | $66.8
Outstanding receivables past due | $19.1 |  | $16.1
(a) | Changes in cash proceeds are recorded in “Sales of accounts receivable” in operating activities in Alliant Energy’s and IPL’s Condensed Consolidated Statements of Cash Flows.
Additional Attributes Of Receivables Sold Under The Agreement | Additional attributes of IPL’s receivables sold under the Agreement for the three and six months ended June 30 were as follows (in millions):
| Three Months |  | Six Months
| 2013 |  | 2012 |  | 2013 |  | 2012
Collections reinvested in receivables | $435.0 |  | $369.5 |  | $926.3 |  | $811.8
Credit losses, net of recoveries | 2.0 |  | 2.2 |  | 3.9 |  | 4.3

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