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Leases (Schedule Of Lease Expenses Included In Consolidated Statements Of Income) (Details) (WPL [Member], Sheboygan Falls Energy Facility [Member], USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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WPL [Member] | Sheboygan Falls Energy Facility [Member]
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| Property, Plant and Equipment [Line Items] | |||
| Interest expense | $ 11.3 | $ 11.7 | $ 12.0 |
| Depreciation and amortization | 6.2 | 6.2 | 6.2 |
| Total lease expenses included in Consolidated Statements of Income | $ 17.5 | $ 17.9 | $ 18.2 |