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Income Taxes (Narrative) (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2017
USD ($)
Income Taxes [Line Items]  
Increase in deferred tax liabilities $ 111.1
IPL [Member]  
Income Taxes [Line Items]  
Increase in deferred tax liabilities 75.1
WPL [Member]  
Income Taxes [Line Items]  
Increase in deferred tax liabilities $ 28.4