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Benefit Plans (Recognized Compensation Expense And Income Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Compensation expense	$ 6.9	$ 10.1	$ 7.5
Income tax benefits	2.8	4.0	3.0
IPL [Member]
Compensation expense	3.6	5.5	4.0
Income tax benefits	1.5	2.2	1.6
WPL [Member]
Compensation expense	3.0	4.1	3.0
Income tax benefits	$ 1.2	$ 1.7	$ 1.2

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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