XML 35 R81.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Segments Of Business (Schedule Of Segment Of Business) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Segment Reporting Information [Line Items] |  |
Operating revenues | $ 952.8 | $ 859.6
Operating income (loss) | 154.2 | 120.7
Income (loss) from continuing operations, net of tax | 108.0 | 72.9
Income (loss) from discontinued operations, net of tax | 0 | (3.0)
Net income (loss) attributable to Alliant Energy common shareowners | 108.0 | 69.9
IPL [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 528.9 | 477.9
Operating income (loss) | 57.5 | 41.1
Net income (loss) attributable to Alliant Energy common shareowners | 43.4 | 22.9
WPL [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 410.4 | 369.8
Operating income (loss) | 87.7 | 72.7
Net income (loss) attributable to Alliant Energy common shareowners | 54.8 | 42.0
Electric [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 675.8 | 633.2
Operating income (loss) | 94.3 | 73.6
Electric [Member] | IPL [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 374.2 | 350.2
Operating income (loss) | 26.5 | 17.2
Electric [Member] | WPL [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 301.6 | 283.0
Operating income (loss) | 67.8 | 56.4
Gas [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 240.7 | 197.3
Operating income (loss) | 43.0 | 37.3
Gas [Member] | IPL [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 135.7 | 114.3
Operating income (loss) | 23.3 | 20.7
Gas [Member] | WPL [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 105.0 | 83.0
Operating income (loss) | 19.7 | 16.6
Other Utilities [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 22.8 | 17.2
Operating income (loss) | 7.9 | 2.9
Other Utilities [Member] | IPL [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 19.0 | 13.4
Operating income (loss) | 7.7 | 3.2
Other Utilities [Member] | WPL [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 3.8 | 3.8
Operating income (loss) | 0.2 | (0.3)
Utilities Business [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 939.3 | 847.7
Operating income (loss) | 145.2 | 113.8
Income (loss) from continuing operations, net of tax |  | 64.9
Income (loss) from discontinued operations, net of tax |  | 0
Net income (loss) attributable to Alliant Energy common shareowners | 98.2 | 64.9
Non-Regulated, Parent and Other [Member] | Other Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 13.5 | 11.9
Operating income (loss) | 9.0 | 6.9
Income (loss) from continuing operations, net of tax |  | 8.0
Income (loss) from discontinued operations, net of tax |  | (3.0)
Net income (loss) attributable to Alliant Energy common shareowners | $ 9.8 | $ 5.0

X
- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_IncomeLossFromContinuingOperations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.14) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 5 + Details
Name: | us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
Name: | us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
Name: | us-gaap_OperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration