XML 100 R26.htm IDEA: XBRL DOCUMENT
v3.2.0.727

Common Equity (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2015
Stockholders' Equity Note [Abstract] |
Common Share Activity | A summary of Alliant Energy’s common stock activity was as follows:
Shares outstanding, January 1, 2015 | 110,935,680 |
At-the-market offering program | 2,186,617 |
Shareowner Direct Plan | 107,412 |
Equity-based compensation plans (Note 9(b)) | 56,378 |
Other | (22,463 | )
Shares outstanding, June 30, 2015 | 113,263,624 |

X
- Definition Tabular disclosure of an entity's capital units or capital shares, including the value of capital units or capital shares, units authorized, units outstanding and other information necessary to a fair presentation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.16) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 + Details
Name: | us-gaap_ScheduleOfCapitalUnitsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_StockholdersEquityNoteAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration