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Benefit Plans (Recognized Compensation Expense And Income Tax Benefits) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Compensation expense	$ 0.1	$ 2.6	$ 4.9	$ 6.2
Income tax benefits	0.1	1.1	2.0	2.5
IPL [Member]
Compensation expense	0.1	1.4	2.7	3.3
Income tax benefits	0.1	0.5	1.1	1.3
WPL [Member]
Compensation expense	0.1	1.1	2.0	2.5
Income tax benefits		$ 0.4	$ 0.8	$ 1.0

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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