XML 38 R62.htm IDEA: XBRL DOCUMENT v2.4.0.6
SHORT-TERM DEBT AND LINES OF CREDIT (Details 2) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Short-term borrowings    
Total short-term credit capacity $ 1,810.0 $ 1,610.0
Letters of credit issued inside credit facilities 29.1 25.5
Short-term borrowings 756.4 482.4
Available capacity under existing agreements 1,024.4 1,102.1
Revolving credit facility maturing on May 17, 2014 | INTEGRYS ENERGY GROUP, INC.
    
Short-term borrowings    
Total short-term credit capacity 275.0 275.0
Revolving credit facility maturing on May 17, 2014 | WPS
    
Short-term borrowings    
Total short-term credit capacity 135.0 135.0
Revolving credit facility maturing on May 17, 2016 | INTEGRYS ENERGY GROUP, INC.
    
Short-term borrowings    
Total short-term credit capacity 200.0 200.0
Revolving credit facility maturing on June 13, 2017 | INTEGRYS ENERGY GROUP, INC.
    
Short-term borrowings    
Total short-term credit capacity 635.0 635.0
Revolving credit facility maturing on June 13, 2017 | WPS
    
Short-term borrowings    
Total short-term credit capacity 115.0 115.0
Revolving credit facility maturing on June 13, 2017 | PGL
    
Short-term borrowings    
Total short-term credit capacity 250.0 250.0
Term credit facility maturing on December 31, 2013
    
Short-term borrowings    
Short-term borrowings 200.0  
Term credit facility maturing on December 31, 2013 | WPS
    
Short-term borrowings    
Total short-term credit capacity 200.0  
Short-term borrowings 200.0  
Commercial paper
    
Short-term borrowings    
Short-term borrowings 556.4 482.4
Accrued interest or original discount on outstanding debt $ 0.1