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Receivables | 3 Months Ended
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Mar. 31, 2017
Receivables [Line Items] |
Receivables | RECEIVABLES Sales of Accounts Receivable - IPL maintains a Receivables Purchase and Sale Agreement (Receivables Agreement) whereby it may sell its customer accounts receivables, unbilled revenues and certain other accounts receivables to a third party through wholly-owned and consolidated special purpose entities. The transfers of receivables meet the criteria for sale accounting established by the transfer of financial assets accounting rules. As of March 31, 2017, IPL sold $221.0 million of receivables to the third party, received $56.0 million in cash proceeds, recorded deferred proceeds of $149.0 million and had $41.8 million of available capacity under its sales of accounts receivable program. For the three months ended March 31, 2017 and 2016, IPL’s costs incurred related to the sales of accounts receivable program were not material. IPL’s maximum and average outstanding cash proceeds (based on daily outstanding balances) related to the sales of accounts receivable program for the three months ended March 31 were as follows (in millions):
| 2017 |  | 2016
Maximum outstanding aggregate cash proceeds |  | $79.0 |  |  |  | $75.0 |
Average outstanding aggregate cash proceeds | 38.4 |  |  | 39.1 |
The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
| March 31, 2017 |  | December 31, 2016
Customer accounts receivable |  | $143.7 |  |  |  | $157.6 |
Unbilled utility revenues | 76.8 |  |  | 90.4 |
Other receivables | 0.5 |  |  | 0.1 |
Receivables sold to third party | 221.0 |  |  | 248.1 |
Less: cash proceeds (a) | 56.0 |  |  | 21.0 |
Deferred proceeds | 165.0 |  |  | 227.1 |
Less: allowance for doubtful accounts | 16.0 |  |  | 16.0 |
Fair value of deferred proceeds |  | $149.0 |  |  |  | $211.1 |
(a) | Changes in cash proceeds are presented in “Sales of accounts receivable” in operating activities in Alliant Energy’s and IPL’s cash flows statements.
As of March 31, 2017, outstanding receivables past due under the Receivables Agreement were $69.9 million. Additional attributes of IPL’s receivables sold under the Receivables Agreement for the three months ended March 31 were as follows (in millions):
| 2017 |  | 2016
Collections reinvested in receivables |  | $501.2 |  |  |  | $440.2 |
Write-offs, net of recoveries | 4.6 |  |  | 0.4 |
In connection with the implementation of IPL’s new customer billing and information system in 2016, IPL postponed the write-off of customer bills for a portion of 2016, resulting in lower write-offs for the three months ended March 31, 2016.
IPL [Member] |
Receivables [Line Items] |
Receivables | RECEIVABLES Sales of Accounts Receivable - IPL maintains a Receivables Purchase and Sale Agreement (Receivables Agreement) whereby it may sell its customer accounts receivables, unbilled revenues and certain other accounts receivables to a third party through wholly-owned and consolidated special purpose entities. The transfers of receivables meet the criteria for sale accounting established by the transfer of financial assets accounting rules. As of March 31, 2017, IPL sold $221.0 million of receivables to the third party, received $56.0 million in cash proceeds, recorded deferred proceeds of $149.0 million and had $41.8 million of available capacity under its sales of accounts receivable program. For the three months ended March 31, 2017 and 2016, IPL’s costs incurred related to the sales of accounts receivable program were not material. IPL’s maximum and average outstanding cash proceeds (based on daily outstanding balances) related to the sales of accounts receivable program for the three months ended March 31 were as follows (in millions):
| 2017 |  | 2016
Maximum outstanding aggregate cash proceeds |  | $79.0 |  |  |  | $75.0 |
Average outstanding aggregate cash proceeds | 38.4 |  |  | 39.1 |
The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
| March 31, 2017 |  | December 31, 2016
Customer accounts receivable |  | $143.7 |  |  |  | $157.6 |
Unbilled utility revenues | 76.8 |  |  | 90.4 |
Other receivables | 0.5 |  |  | 0.1 |
Receivables sold to third party | 221.0 |  |  | 248.1 |
Less: cash proceeds (a) | 56.0 |  |  | 21.0 |
Deferred proceeds | 165.0 |  |  | 227.1 |
Less: allowance for doubtful accounts | 16.0 |  |  | 16.0 |
Fair value of deferred proceeds |  | $149.0 |  |  |  | $211.1 |
(a) | Changes in cash proceeds are presented in “Sales of accounts receivable” in operating activities in Alliant Energy’s and IPL’s cash flows statements.
As of March 31, 2017, outstanding receivables past due under the Receivables Agreement were $69.9 million. Additional attributes of IPL’s receivables sold under the Receivables Agreement for the three months ended March 31 were as follows (in millions):
| 2017 |  | 2016
Collections reinvested in receivables |  | $501.2 |  |  |  | $440.2 |
Write-offs, net of recoveries | 4.6 |  |  | 0.4 |
In connection with the implementation of IPL’s new customer billing and information system in 2016, IPL postponed the write-off of customer bills for a portion of 2016, resulting in lower write-offs for the three months ended March 31, 2016.

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