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INVESTMENTS IN AFFILIATES, AT EQUITY METHOD (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Investments in affiliates, at equity method      
Investments in affiliates, at equity method $ 476.3 $ 425.5  
Changes in equity method investments      
Equity method investments balance at beginning of period 425.5    
Add: Capital contributions (37.6) (6.9) (34.1)
Equity method investments balance at end of period 476.3 425.5  
ATC
      
Investments in affiliates, at equity method      
Investments in affiliates, at equity method 439.4 416.3 395.9
Equity method investment, ownership interest (as a percent) 34.00%    
Changes in equity method investments      
Equity method investments balance at beginning of period 416.3 395.9 346.9
Add: Equity in net income (loss) 79.1 77.6 75.3
Add: Capital contributions 8.5 6.8 34.1
Less: Dividends received 64.5 64.0 60.4
Equity method investments balance at end of period 439.4 416.3 395.9
Related party transactions      
Revenues from services provided to related party 13.5 14.0 10.1
Expenses related to services received from related party 102.7 103.0 90.7
INDU Solar Holdings, LLC
      
Investments in affiliates, at equity method      
Investments in affiliates, at equity method 28.4 0.1  
Equity method investment, ownership interest (as a percent) 50.00%    
Changes in equity method investments      
Equity method investments balance at beginning of period 0.1    
Add: Equity in net income (loss) (0.7) (0.4)  
Add: Capital contributions 29.0 0.5  
Equity method investments balance at end of period 28.4 0.1  
WRPC
      
Investments in affiliates, at equity method      
Investments in affiliates, at equity method 7.7 8.1 8.5
Changes in equity method investments      
Equity method investments balance at beginning of period 8.1 8.5 8.4
Add: Equity in net income (loss) 0.9 1.0 1.0
Less: Dividends received 1.3 1.4 0.9
Equity method investments balance at end of period 7.7 8.1 8.5
Other;
      
Investments in affiliates, at equity method      
Investments in affiliates, at equity method 0.8 1.0  
Changes in equity method investments      
Equity method investments balance at end of period $ 0.8 $ 1.0