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SCHEDULE I - CONDENSED PARENT COMPANY FINANCIAL STATEMENTS SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash and Cash Equivalents      
Maximum term of original maturity to classify instruments as cash equivalent 3 months    
Cash Flow, Noncash Investing and Financing Activities      
Equity issued for reinvested dividends $ 12.0 $ 0 $ 5.4
Equity issued for stock-based compensation plans 16.3 0 10.6
Integrys Energy Group, Inc.
     
Cash and Cash Equivalents      
Maximum term of original maturity to classify instruments as cash equivalent 3 months    
Cash Flow, Noncash Investing and Financing Activities      
Equity issued for reinvested dividends 12.0 0 5.4
Equity issued for stock-based compensation plans $ 16.3 $ 0 $ 10.6