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Discontinued Operations And Assets And Liabilities Held For Sale (Tables) | 9 Months Ended
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Sep. 30, 2013
Discontinued Operations and Disposal Groups [Abstract] |
Components Of Discontinued Operations In Condensed Consolidated Statements Of Income | A summary of the components of discontinued operations in Alliant Energy’s Condensed Consolidated Statements of Income for the three and nine months ended September 30 was as follows (in millions):
| Three Months |  | Nine Months
| 2013 |  | 2012 |  | 2013 |  | 2012
Operating revenues |  | $— |  |  |  | $94.5 |  |  |  | $0.9 |  |  |  | $243.0 |
Operating expenses | 2.1 |  |  | 91.7 |  |  | 8.6 |  |  | 246.6 |
Interest expense and other | — |  |  | 0.2 |  |  | — |  |  | 0.4 |
Income (loss) before income taxes | (2.1 | ) |  | 2.6 |  |  | (7.7 | ) |  | (4.0 | )
Income tax expense (benefit) | (0.8 | ) |  | 0.9 |  |  | (2.8 | ) |  | (1.7 | )
Income (loss) from discontinued operations, net of tax |  | ($1.3 | ) |  |  | $1.7 |  |  |  | ($4.9 | ) |  |  | ($2.3 | )
Components Of Assets And Liabilities Held For Sale In Condensed Consolidated Balance Sheets | As of December 31, 2012, Alliant Energy’s Condensed Consolidated Balance Sheet included assets held for sale recorded in “Other current assets” and liabilities held for sale recorded in “Other current liabilities” as follows (in millions):
Current assets |  | $27.9 |
Current liabilities | 31.4 |
Net liabilities held for sale |  | ($3.5 | )

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- Definition Tabular disclosure of disposal groups, which may include the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the classification and carrying value of the assets and liabilities comprising the disposal group, and the segment in which the disposal group was reported. Also may include the amount of adjustments to amounts previously reported in discontinued operations such as resolution of contingencies arising from the disposal transaction or the operations of the component prior to disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1510-107760 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1474-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 43, 44, 45, 47, 48 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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