Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2016

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Components Of Discontinued Operations In Consolidated Statements Of Income

A summary of the components of discontinued operations in Alliant Energy’s income statements was as follows (in millions):

	2016			2015			2014
Operating expenses		$3.9			$4.0			$3.7
Loss before income taxes	(3.9		)	(4.0		)	(3.7		)
Income tax benefit	(1.6		)	(1.5		)	(1.3		)
Loss from discontinued operations, net of tax		($2.3	)		($2.5	)		($2.4	)