Quarterly report pursuant to Section 13 or 15(d)

Debt And Credit Facilities (Schedule Of Long-Term Debt) (Details)

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Debt And Credit Facilities (Schedule Of Long-Term Debt) (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Face Amount $ 5,459,400,000 $ 2,325,000,000
Total Long-term Debt 3,883,500,000 1,713,100,000
Revolving loans drawn 250,000,000 0
Term Loan, Amount Paid as of Reporting Date 265,600,000  
Term Loan $1.25 Billion [Member]
    
Type Variable  
Average Annual Interest Rate 1.73%  
Final Maturity 2016  
Face Amount 984,400,000 [1]  
Total Long-term Debt 922,100,000 [1]  
Amount included in Current portion of loan 62,300,000  
Senior Notes $700 Million due 2021 [Member]
    
Type Fixed  
Average Annual Interest Rate 4.88%  
Final Maturity 2021  
Face Amount 700,000,000  
Total Long-term Debt 699,300,000 [2]  
Unamortized discount 700,000  
Average annual borrowing rate for outstanding revolving and term loans 4.89%  
Senior Notes $500 Million due 2020 [Member]
    
Type Fixed Fixed
Average Annual Interest Rate 4.80% 4.80%
Final Maturity 2020 2020
Face Amount 500,000,000 500,000,000
Total Long-term Debt 499,000,000 [3] 499,000,000 [3]
Unamortized discount 1,000,000 1,000,000
Average annual borrowing rate for outstanding revolving and term loans 4.83%  
Senior Notes $500 Million due 2040 [Member]
    
Type   Fixed
Average Annual Interest Rate   6.25%
Final Maturity   2040
Face Amount   500,000,000
Total Long-term Debt   491,300,000 [4]
Unamortized discount   8,700,000
Average annual borrowing rate for outstanding revolving and term loans 6.38%  
Senior Notes $800 Million, at 6.25% due 2040 [Member]
    
Type Fixed  
Average Annual Interest Rate 6.25%  
Final Maturity 2040  
Face Amount 800,000,000  
Total Long-term Debt 790,100,000 [4]  
Unamortized discount 9,900,000  
Senior Notes $400 Million [Member]
    
Type Fixed Fixed [5]
Average Annual Interest Rate 5.90% 5.90% [5]
Final Maturity 2020 2020 [5]
Face Amount 400,000,000 400,000,000 [5]
Total Long-term Debt 398,000,000 [5] 397,800,000 [5]
Unamortized discount 2,000,000 2,200,000
Average annual borrowing rate for outstanding revolving and term loans 5.98%  
Series 2008A - Tranche A [Member]
    
Type Fixed Fixed
Average Annual Interest Rate 6.31% 6.31%
Final Maturity 2013 2013
Face Amount 270,000,000 270,000,000
Total Long-term Debt 270,000,000 270,000,000
Series 2008A - Tranche B [Member]
    
Type Fixed Fixed
Average Annual Interest Rate 6.59% 6.59%
Final Maturity 2015 2015
Face Amount 55,000,000 55,000,000
Total Long-term Debt 55,000,000 55,000,000
Revolving Credit Facility [Member]
    
Type Variable Variable
Average Annual Interest Rate 1.84% 0.00%
Final Maturity 2016 2012
Face Amount 1,750,000,000 600,000,000
Total Long-term Debt 250,000,000 [6]  
Principal amount of letter of credit obligations 23,500,000 64,700,000
Credit facility remaining capacity 1,476,500,000 535,300,000
Private Placement [Member]
    
Face Amount $ 325,000,000 $ 325,000,000
[1] As of September 30, 2011, $265.6 million had been paid down on the orgininal $1.25 billion term loan and of the remaining term loan $62.3 million was classified as Current portion of term loan. The current classification is based upon the principal payment terms of the arrangement requiring principal payments on each three-month anniversary following the funding of the term loan.
[2] As of September 30, 2011, the $700 million 4.875 percent senior notes were recorded at a par value of $700 million less unamortized discounts of $0.7 million, based on an imputed interest rate of 4.89 percent.
[3] As of September 30, 2011 and December 31, 2010, the $500 million 4.80 percent senior notes were recorded at a par value of $500 million less unamortized discounts of $1.0 million and $1.0 million, respectively, based on an imputed interest rate of 4.83 percent.
[4] As of September 30, 2011 and December 31, 2010, the $800 million and $500 million 6.25 percent senior notes were recorded at par values of $800 million and $500 million, respectively, less unamortized discounts of $9.9 million and $8.7 million, respectively, based on an imputed interest rate of 6.38 percent.
[5] As of September 30, 2011 and December 31, 2010, the $400 million 5.90 percent senior notes were recorded at a par value of $400 million less unamortized discounts of $2.0 million and $2.2 million, respectively, based on an imputed interest rate of 5.98 percent.
[6] As of September 30, 2011 and December 31, 2010, $250 million and no revolving loans were drawn under the credit facility, respectively, and the principal amount of letter of credit obligations totaled $23.5 million and $64.7 million, respectively, thereby reducing available borrowing capacity to $1,476.5 million and $535.3 million, respectively.