XML 96 R34.htm IDEA: XBRL DOCUMENT
v3.3.0.814

Segments Of Business (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2015
Segment Reporting Information [Line Items] |
Schedule Of Segments Of Business | Certain financial information relating to Alliant Energy’s business segments is as follows. Intersegment revenues were not material to Alliant Energy’s operations.
| Utility |  | Non-Regulated, |  | Alliant Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Three Months Ended September 30, 2015 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $835.8 |  |  |  | $38.0 |  |  |  | $13.4 |  |  |  | $887.2 |  |  |  | $11.7 |  |  |  | $898.9 |
Operating income (loss) | 232.8 |  |  | (5.7 | ) |  | 0.2 |  |  | 227.3 |  |  | 8.6 |  |  | 235.9 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax |  |  |  |  |  |  | 184.9 |  |  | (4.9 | ) |  | 180.0 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (0.1 | ) |  | (0.1 | )
Net income (loss) |  |  |  |  |  |  | 184.9 |  |  | (5.0 | ) |  | 179.9 |
Three Months Ended September 30, 2014 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $771.2 |  |  |  | $47.2 |  |  |  | $12.2 |  |  |  | $830.6 |  |  |  | $12.5 |  |  |  | $843.1 |
Operating income (loss) | 190.8 |  |  | (4.4 | ) |  | 1.4 |  |  | 187.8 |  |  | 7.0 |  |  | 194.8 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax |  |  |  |  |  |  | 164.1 |  |  | (8.9 | ) |  | 155.2 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (1.9 | ) |  | (1.9 | )
Net income (loss) |  |  |  |  |  |  | 164.1 |  |  | (10.8 | ) |  | 153.3 |
| Utility |  | Non-Regulated, |  | Alliant Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Nine Months Ended September 30, 2015 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $2,147.5 |  |  |  | $288.1 |  |  |  | $44.6 |  |  |  | $2,480.2 |  |  |  | $33.3 |  |  |  | $2,513.5 |
Operating income | 438.4 |  |  | 28.6 |  |  | 8.7 |  |  | 475.7 |  |  | 22.1 |  |  | 497.8 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 333.0 |  |  | 12.5 |  |  | 345.5 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (1.4 | ) |  | (1.4 | )
Net income |  |  |  |  |  |  | 333.0 |  |  | 11.1 |  |  | 344.1 |
Nine Months Ended September 30, 2014 |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $2,090.9 |  |  |  | $364.8 |  |  |  | $50.6 |  |  |  | $2,506.3 |  |  |  | $39.9 |  |  |  | $2,546.2 |
Operating income | 374.2 |  |  | 41.3 |  |  | 11.5 |  |  | 427.0 |  |  | 25.3 |  |  | 452.3 |
Amounts attributable to Alliant Energy common shareowners: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations, net of tax |  |  |  |  |  |  | 315.3 |  |  | 10.0 |  |  | 325.3 |
Loss from discontinued operations, net of tax |  |  |  |  |  |  | — |  |  | (2.2 | ) |  | (2.2 | )
Net income |  |  |  |  |  |  | 315.3 |  |  | 7.8 |  |  | 323.1 |
IPL [Member] |
Segment Reporting Information [Line Items] |
Schedule Of Segments Of Business | Certain financial information relating to IPL’s business segments is as follows. Intersegment revenues were not material to IPL’s operations.
| Electric |  | Gas |  | Other |  | Total
| (in millions)
Three Months Ended September 30, 2015 |  |  |  |  |  |  |
Operating revenues |  | $468.6 |  |  |  | $23.1 |  |  |  | $12.9 |  |  |  | $504.6 |
Operating income (loss) | 119.4 |  |  | (2.9 | ) |  | 0.5 |  |  | 117.0 |
Earnings available for common stock |  |  |  |  |  |  | 117.4 |
Three Months Ended September 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $435.9 |  |  |  | $28.7 |  |  |  | $11.6 |  |  |  | $476.2 |
Operating income (loss) | 94.7 |  |  | (2.8 | ) |  | 2.0 |  |  | 93.9 |
Earnings available for common stock |  |  |  |  |  |  | 102.5 |
Nine Months Ended September 30, 2015 |  |  |  |  |  |  |
Operating revenues |  | $1,170.6 |  |  |  | $164.1 |  |  |  | $41.1 |  |  |  | $1,375.8 |
Operating income | 193.6 |  |  | 15.3 |  |  | 7.4 |  |  | 216.3 |
Earnings available for common stock |  |  |  |  |  |  | 181.9 |
Nine Months Ended September 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $1,164.7 |  |  |  | $208.1 |  |  |  | $44.2 |  |  |  | $1,417.0 |
Operating income | 150.2 |  |  | 22.1 |  |  | 13.1 |  |  | 185.4 |
Earnings available for common stock |  |  |  |  |  |  | 164.3 |
WPL [Member] |
Segment Reporting Information [Line Items] |
Schedule Of Segments Of Business | Certain financial information relating to WPL’s business segments is as follows. Intersegment revenues were not material to WPL’s operations.
| Electric |  | Gas |  | Other |  | Total
| (in millions)
Three Months Ended September 30, 2015 |  |  |  |  |  |  |
Operating revenues |  | $367.2 |  |  |  | $14.9 |  |  |  | $0.5 |  |  |  | $382.6 |
Operating income (loss) | 113.4 |  |  | (2.8 | ) |  | (0.3 | ) |  | 110.3 |
Earnings available for common stock |  |  |  |  |  |  | 67.5 |
Three Months Ended September 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $335.3 |  |  |  | $18.5 |  |  |  | $0.6 |  |  |  | $354.4 |
Operating income (loss) | 96.1 |  |  | (1.6 | ) |  | (0.6 | ) |  | 93.9 |
Earnings available for common stock |  |  |  |  |  |  | 61.6 |
Nine Months Ended September 30, 2015 |  |  |  |  |  |  |
Operating revenues |  | $976.9 |  |  |  | $124.0 |  |  |  | $3.5 |  |  |  | $1,104.4 |
Operating income | 244.8 |  |  | 13.3 |  |  | 1.3 |  |  | 259.4 |
Earnings available for common stock |  |  |  |  |  |  | 151.1 |
Nine Months Ended September 30, 2014 |  |  |  |  |  |  |
Operating revenues |  | $926.2 |  |  |  | $156.7 |  |  |  | $6.4 |  |  |  | $1,089.3 |
Operating income (loss) | 224.0 |  |  | 19.2 |  |  | (1.6 | ) |  | 241.6 |
Earnings available for common stock |  |  |  |  |  |  | 151.0 |

X
- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 + Details
Name: | us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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: |