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Benefit Plans (Recognized Compensation Expense And Income Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Compensation expense	$ 4.0	$ 0.1	$ 8.6	$ 3.8
Income tax benefits	1.6	0	3.5	1.5
IPL [Member]
Compensation expense	2.0	0.1	4.4	2.0
Income tax benefits	0.8	0	1.8	0.8
WPL [Member]
Compensation expense	1.7	0.1	3.7	1.7
Income tax benefits	$ 0.7	$ 0.1	$ 1.5	$ 0.7

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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