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Investments (Unconsolidated Equity Investments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]
Carrying value	$ 281.4		$ 266.6		$ 249.6
Equity (income) / loss	(43.7)		(41.3)		(39.3)
WPL [Member]
Schedule of Equity Method Investments [Line Items]
Equity (income) / loss	(43.7)		(42.1)		(38.7)
ATC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	16.00%	[1]
Carrying value	272.1	[1]	257.0	[1]
Equity (income) / loss	(42.7)	[1]	(41.3)	[1]	(37.8)	[1]
ATC [Member] | WPL [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	16.00%	[1]
Carrying value	272.1	[1]	257.0	[1]
Equity (income) / loss	(42.7)	[1]	(41.3)	[1]	(37.8)	[1]
Wisconsin River Power Company [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%
Carrying value	7.0		7.3
Equity (income) / loss	(1.0)		(0.8)		(0.9)
Wisconsin River Power Company [Member] | WPL [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%
Carrying value	7.0		7.3
Equity (income) / loss	(1.0)		(0.8)		(0.9)
Other Equity [Member]
Schedule of Equity Method Investments [Line Items]
Carrying value	2.3		2.3
Equity (income) / loss	0		0.8		(0.6)
Totals [Member]
Schedule of Equity Method Investments [Line Items]
Carrying value	281.4		266.6
Equity (income) / loss	(43.7)		(41.3)		(39.3)
Totals [Member] | WPL [Member]
Schedule of Equity Method Investments [Line Items]
Carrying value	279.1		264.3
Equity (income) / loss	$ (43.7)		$ (42.1)		$ (38.7)
[1] Alliant Energy and WPL have the ability to exercise significant influence over ATC’s financial and operating policies through their participation on ATC’s Board of Directors. Refer to Note 18 for information regarding related party transactions with ATC.

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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