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Investments (Tables)
 3 Months Ended
Mar. 31, 2017
Schedule of Investments [Line Items]  
Unconsolidated Equity Investments
Equity (income) loss from unconsolidated investments accounted for under the equity method of accounting for the three months ended March 31 was as follows (in millions):
 
Alliant Energy
 
WPL
 
2017
 
2016
 
2017
 
2016
ATC Investment

($11.5
)
 

($10.7
)
 

$—

 

($10.7
)
Other
—

 
0.2

 
—

 
—

 

($11.5
)
 

($10.5
)
 

$—

 

($10.7
)
WPL [Member]  
Schedule of Investments [Line Items]  
Unconsolidated Equity Investments
Equity (income) loss from unconsolidated investments accounted for under the equity method of accounting for the three months ended March 31 was as follows (in millions):
 
Alliant Energy
 
WPL
 
2017
 
2016
 
2017
 
2016
ATC Investment

($11.5
)
 

($10.7
)
 

$—

 

($10.7
)
Other
—

 
0.2

 
—

 
—

 

($11.5
)
 

($10.5
)
 

$—

 

($10.7
)