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Investments (Unconsolidated Equity Investments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Schedule of Investments [Line Items]
Equity (income) loss from unconsolidated investments, net	$ (6.5)	$ (11.4)
WPL [Member]
Schedule of Investments [Line Items]
Equity (income) loss from unconsolidated investments, net	(7.8)	(11.4)
ATC [Member]
Schedule of Investments [Line Items]
Equity (income) loss from unconsolidated investments, net	(7.8)	(11.2)
ATC [Member] \| WPL [Member]
Schedule of Investments [Line Items]
Equity (income) loss from unconsolidated investments, net	(7.8)	(11.2)
Other [Member]
Schedule of Investments [Line Items]
Equity (income) loss from unconsolidated investments, net	1.3	(0.2)
Other [Member] \| WPL [Member]
Schedule of Investments [Line Items]
Equity (income) loss from unconsolidated investments, net	$ 0	$ (0.2)

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.

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