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Commitments And Contingencies (Schedule Of Environmental Liabilities) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Current environmental liabilities	$ 2.0	$ 3.6
Non-current environmental liabilities	13.5	15.4
Total environmental liabilities	15.5	19.0
Minimum range of estimated future cost incurred for investigation, remediation and monitoring	12
Maximum remaining estimated cost incurred for investigation, remediation and monitoring	31
IPL [Member]
Current environmental liabilities	1.7	2.8
Non-current environmental liabilities	11.9	13.6
Total environmental liabilities	13.6	16.4
Minimum range of estimated future cost incurred for investigation, remediation and monitoring	11
Maximum remaining estimated cost incurred for investigation, remediation and monitoring	29
WPL [Member]
Current environmental liabilities	0.3	0.8
Non-current environmental liabilities	1.6	1.7
Total environmental liabilities	1.9	2.5
Minimum range of estimated future cost incurred for investigation, remediation and monitoring	1
Maximum remaining estimated cost incurred for investigation, remediation and monitoring	2
Natural Gas Processing Plant [Member]
Total environmental liabilities	16.0
Natural Gas Processing Plant [Member] \| IPL [Member]
Total environmental liabilities	14.0
Natural Gas Processing Plant [Member] \| WPL [Member]
Total environmental liabilities	$ 2.0

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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- Definition

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

+ References+ Details