Investments

3 Months Ended

Mar. 31, 2015

Schedule of Investments [Line Items]

Investments

INVESTMENTS

Unconsolidated Equity Investments - Equity (income) loss from unconsolidated investments accounted for under the equity method of accounting for the three months ended March 31 was as follows (in millions):

	Alliant Energy						WPL
	2015			2014			2015			2014
ATC		($7.8	)		($11.2	)		($7.8	)		($11.2	)
Other	1.3			(0.2		)	—			(0.2		)
		($6.5	)		($11.4	)		($7.8	)		($11.4	)

WPL [Member]

Schedule of Investments [Line Items]

Investments

INVESTMENTS

Unconsolidated Equity Investments - Equity (income) loss from unconsolidated investments accounted for under the equity method of accounting for the three months ended March 31 was as follows (in millions):

	Alliant Energy						WPL
	2015			2014			2015			2014
ATC		($7.8	)		($11.2	)		($7.8	)		($11.2	)
Other	1.3			(0.2		)	—			(0.2		)
		($6.5	)		($11.4	)		($7.8	)		($11.4	)