XML 54 R12.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Receivables | 12 Months Ended
--- | ---
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Receivables | RECEIVABLES (a) Accounts Receivable - Details for accounts receivable included on the balance sheets as of December 31 were as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
| 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015
Customer |  | $111.7 |  |  |  | $93.8 |  |  |  | $— |  |  |  | $4.6 |  |  |  | $104.4 |  |  |  | $81.5 |
Unbilled utility revenues | 90.2 |  |  | 83.1 |  |  | — |  |  | 1.2 |  |  | 90.2 |  |  | 81.9 |
Deferred proceeds | 211.1 |  |  | 172.0 |  |  | 211.1 |  |  | 172.0 |  |  | — |  |  | — |
Other | 89.0 |  |  | 53.5 |  |  | 30.7 |  |  | 22.8 |  |  | 38.8 |  |  | 25.7 |
Allowance for doubtful accounts | (8.7 | ) |  | (4.8 | ) |  | (1.1 | ) |  | (0.6 | ) |  | (7.1 | ) |  | (3.7 | )
|  | $493.3 |  |  |  | $397.6 |  |  |  | $240.7 |  |  |  | $200.0 |  |  |  | $226.3 |  |  |  | $185.4 |
(b) Sales of Accounts Receivable - IPL maintains a 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. IPL pays a monthly fee to the third party that varies based on interest rates, limits on cash proceeds and cash amounts received from the third party. In March 2016, IPL extended through March 2018 the purchase commitment from the third party to which it sells its receivables. The transfers of receivables meet the criteria for sale accounting established by the transfer of financial assets accounting rules. In 2016, 2015 and 2014, IPL received cash proceeds of up to $180 million from the third party in exchange for the receivables sold. Cash proceeds are used by IPL to meet short-term financing needs, and cannot exceed the current limit or amount of receivables available for sale, whichever is less. The limit on cash proceeds as of December 31, 2016 was $150 million, and effective February 2017 the limit on cash proceeds is $125 million. The Receivables Agreement can be terminated by the third party if arrears or write-offs exceed certain levels. IPL was in compliance with all related covenants as of December 31, 2016. As of December 31, 2016, IPL sold $248.1 million of receivables to the third party, received $21.0 million in cash proceeds and recorded deferred proceeds of $211.1 million. Deferred proceeds represent IPL’s interest in the receivables sold to the third party. At IPL’s request, deferred proceeds are paid to IPL from collections of receivables, after paying any required expenses incurred by the third party and the collection agent. Corporate Services acts as collection agent for the third party and receives a fee for collection services. IPL believes that the allowance for doubtful accounts related to its sales of receivables is a reasonable approximation of credit risk of the customers that generated the receivables. In 2016, 2015 and 2014, IPL’s costs incurred related to the sales of accounts receivable program were not material. Refer to Note 14 for discussion of the fair value of deferred proceeds. IPL’s maximum and average outstanding aggregate cash proceeds (based on daily outstanding balances) related to the sales of accounts receivable program were as follows (in millions):
| Maximum |  | Average
| 2016 |  | 2015 |  | 2014 |  | 2016 |  | 2015 |  | 2014
Outstanding aggregate cash proceeds | $172.0 |  | $137.0 |  | $150.0 |  | $73.2 |  | $46.7 |  | $46.4
As of December 31, the attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
| 2016 |  | 2015
Customer accounts receivable | $157.6 |  | $109.7
Unbilled utility revenues | 90.4 |  | 71.3
Other receivables | 0.1 |  | 0.1
Receivables sold to third party | 248.1 |  | 181.1
Less: cash proceeds (a) | 21.0 |  | 5.0
Deferred proceeds | 227.1 |  | 176.1
Less: allowance for doubtful accounts | 16.0 |  | 4.1
Fair value of deferred proceeds | $211.1 |  | $172.0
Outstanding receivables past due | $68.0 |  | $18.0
(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.
Additional attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
| 2016 |  | 2015 |  | 2014
Collections reinvested in receivables | $1,818.1 |  | $1,812.9 |  | $1,997.9
Write-offs, net of recoveries | 4.8 |  | 8.8 |  | 11.4
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 in 2016 and higher outstanding receivables past due as of December 31, 2016. (c) Whiting Petroleum Tax Sharing Agreement - Prior to an initial public offering of Whiting Petroleum in 2003, Alliant Energy and Whiting Petroleum entered into a tax separation and indemnification agreement pursuant to which Alliant Energy and Whiting Petroleum made certain tax elections. These tax elections had the effect of increasing the tax basis of the assets of Whiting Petroleum’s consolidated tax group based on the sales price of Whiting Petroleum’s shares in the initial public offering. The increase in the tax basis of the assets was included as income in Alliant Energy’s U.S. federal income tax return for the calendar year 2003. Pursuant to the tax separation and indemnification agreement, Whiting Petroleum paid Alliant Energy the final payment of $26 million in 2014, which represented the present value of certain future tax benefits expected to be realized by Whiting Petroleum through future tax deductions. The $26 million received by Alliant Energy is presented in operating activities in its cash flows statement in 2014.
IPL [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Receivables | RECEIVABLES (a) Accounts Receivable - Details for accounts receivable included on the balance sheets as of December 31 were as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
| 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015
Customer |  | $111.7 |  |  |  | $93.8 |  |  |  | $— |  |  |  | $4.6 |  |  |  | $104.4 |  |  |  | $81.5 |
Unbilled utility revenues | 90.2 |  |  | 83.1 |  |  | — |  |  | 1.2 |  |  | 90.2 |  |  | 81.9 |
Deferred proceeds | 211.1 |  |  | 172.0 |  |  | 211.1 |  |  | 172.0 |  |  | — |  |  | — |
Other | 89.0 |  |  | 53.5 |  |  | 30.7 |  |  | 22.8 |  |  | 38.8 |  |  | 25.7 |
Allowance for doubtful accounts | (8.7 | ) |  | (4.8 | ) |  | (1.1 | ) |  | (0.6 | ) |  | (7.1 | ) |  | (3.7 | )
|  | $493.3 |  |  |  | $397.6 |  |  |  | $240.7 |  |  |  | $200.0 |  |  |  | $226.3 |  |  |  | $185.4 |
(b) Sales of Accounts Receivable - IPL maintains a 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. IPL pays a monthly fee to the third party that varies based on interest rates, limits on cash proceeds and cash amounts received from the third party. In March 2016, IPL extended through March 2018 the purchase commitment from the third party to which it sells its receivables. The transfers of receivables meet the criteria for sale accounting established by the transfer of financial assets accounting rules. In 2016, 2015 and 2014, IPL received cash proceeds of up to $180 million from the third party in exchange for the receivables sold. Cash proceeds are used by IPL to meet short-term financing needs, and cannot exceed the current limit or amount of receivables available for sale, whichever is less. The limit on cash proceeds as of December 31, 2016 was $150 million, and effective February 2017 the limit on cash proceeds is $125 million. The Receivables Agreement can be terminated by the third party if arrears or write-offs exceed certain levels. IPL was in compliance with all related covenants as of December 31, 2016. As of December 31, 2016, IPL sold $248.1 million of receivables to the third party, received $21.0 million in cash proceeds and recorded deferred proceeds of $211.1 million. Deferred proceeds represent IPL’s interest in the receivables sold to the third party. At IPL’s request, deferred proceeds are paid to IPL from collections of receivables, after paying any required expenses incurred by the third party and the collection agent. Corporate Services acts as collection agent for the third party and receives a fee for collection services. IPL believes that the allowance for doubtful accounts related to its sales of receivables is a reasonable approximation of credit risk of the customers that generated the receivables. In 2016, 2015 and 2014, IPL’s costs incurred related to the sales of accounts receivable program were not material. Refer to Note 14 for discussion of the fair value of deferred proceeds. IPL’s maximum and average outstanding aggregate cash proceeds (based on daily outstanding balances) related to the sales of accounts receivable program were as follows (in millions):
| Maximum |  | Average
| 2016 |  | 2015 |  | 2014 |  | 2016 |  | 2015 |  | 2014
Outstanding aggregate cash proceeds | $172.0 |  | $137.0 |  | $150.0 |  | $73.2 |  | $46.7 |  | $46.4
As of December 31, the attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
| 2016 |  | 2015
Customer accounts receivable | $157.6 |  | $109.7
Unbilled utility revenues | 90.4 |  | 71.3
Other receivables | 0.1 |  | 0.1
Receivables sold to third party | 248.1 |  | 181.1
Less: cash proceeds (a) | 21.0 |  | 5.0
Deferred proceeds | 227.1 |  | 176.1
Less: allowance for doubtful accounts | 16.0 |  | 4.1
Fair value of deferred proceeds | $211.1 |  | $172.0
Outstanding receivables past due | $68.0 |  | $18.0
(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.
Additional attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
| 2016 |  | 2015 |  | 2014
Collections reinvested in receivables | $1,818.1 |  | $1,812.9 |  | $1,997.9
Write-offs, net of recoveries | 4.8 |  | 8.8 |  | 11.4
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 in 2016 and higher outstanding receivables past due as of December 31, 2016.
WPL [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Receivables | RECEIVABLES (a) Accounts Receivable - Details for accounts receivable included on the balance sheets as of December 31 were as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
| 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015
Customer |  | $111.7 |  |  |  | $93.8 |  |  |  | $— |  |  |  | $4.6 |  |  |  | $104.4 |  |  |  | $81.5 |
Unbilled utility revenues | 90.2 |  |  | 83.1 |  |  | — |  |  | 1.2 |  |  | 90.2 |  |  | 81.9 |
Deferred proceeds | 211.1 |  |  | 172.0 |  |  | 211.1 |  |  | 172.0 |  |  | — |  |  | — |
Other | 89.0 |  |  | 53.5 |  |  | 30.7 |  |  | 22.8 |  |  | 38.8 |  |  | 25.7 |
Allowance for doubtful accounts | (8.7 | ) |  | (4.8 | ) |  | (1.1 | ) |  | (0.6 | ) |  | (7.1 | ) |  | (3.7 | )
|  | $493.3 |  |  |  | $397.6 |  |  |  | $240.7 |  |  |  | $200.0 |  |  |  | $226.3 |  |  |  | $185.4 |

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5066-111524 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(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(6)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 4: 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(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5162-111524 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524 + Details
Name: | us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=lnt_IplMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=lnt_WplMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |