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DISPOSITIONS - DISCONTINUED OPERATIONS (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Discontinued operations recorded in income statements      
Discontinued operations, net of tax $ (0.1) $ 6.1  
Holding Company and Other
     
Discontinued operations recorded in income statements      
Discontinued operations, net of tax   6.0  
Integrys Energy Services | Combined Locks Energy Center
     
Assets classified as held for sale on balance sheets      
Total assets 0.7   0.7
Discontinued operations recorded in income statements      
Discontinued operations, net of tax (0.1) (0.1)  
Integrys Energy Services | WPS Empire State, Inc | WPS Beaver Falls Generation, LLC and WPS Syracuse Generation, LLC
     
Discontinued operations recorded in income statements      
Discontinued operations, net of tax   $ 0.2