Annual report pursuant to Section 13 and 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 $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]    
Revolving loans drawn   $ 0
Term Loan, Amount Paid as of Reporting Date 278,000,000  
Private Placement [Member]
    
Debt Instrument [Line Items]    
Face Amount 325,000,000 325,000,000
Term Loan1.250 Million Member
    
Debt Instrument [Line Items]    
Type Variable  
Average Annual Interest Rate 1.40%  
Final Maturity 2016  
Face Amount 972,000,000  
Total Long-term Debt 897,200,000 [1]  
Current Portion of term loan 74,800,000  
Senior Notes 700 Million Due 2021 [Member]
    
Debt Instrument [Line Items]    
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  
Imputed interest rate 4.89%  
Senior Notes 500 Million Due 2020 Member
    
Debt Instrument [Line Items]    
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 499,100,000 [3] 499,000,000 [3]
Unamortized discount 900,000 1,000,000
Imputed interest rate 4.83%  
Senior Notes 500 Million Due 2040 Member
    
Debt Instrument [Line Items]    
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
Senior Notes 800 Million Due 2040 Member
    
Debt Instrument [Line Items]    
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  
Imputed interest rate 6.38%  
Senior Notes 400 Million [Member]
    
Debt Instrument [Line Items]    
Type Fixed Fixed
Average Annual Interest Rate 5.90% 5.90%
Final Maturity 2020 2020
Face Amount 400,000,000 400,000,000
Total Long-term Debt 398,000,000 [5] 397,800,000 [5]
Unamortized discount 2,000,000 2,200,000
Imputed interest rate 5.98%  
Series2008a Tranche [Member]
    
Debt Instrument [Line Items]    
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
Series2008a Tranche B [Member]
    
Debt Instrument [Line Items]    
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]
    
Debt Instrument [Line Items]    
Type Variable Variable
Final Maturity 2016 2012
Face Amount 1,750,000,000 600,000,000
Total Long-term Debt    [6]    [6]
Principal amount of letter of credit obligations 23,500,000 64,700,000
Credit facility remaining capacity 1,726,500,000 535,300,000
Outstanding bank commitments on the multi-option facility $ 23,500,000 $ 64,700,000
[1] As of December 31, 2011, $278.0 million had been paid down on the original $1.25 billion term loan and of the remaining term loan $74.8 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 December 31, 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 December 31, 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 $0.9 million and $1.0 million, respectively, based on an imputed interest rate of 4.83 percent.
[4] As of December 31, 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 December 31, 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 December 31, 2011 and December 31, 2010, no revolving loans were drawn under the credit facility and the principal amount of letter of credit obligations totaled $23.5 million and $64.7 million, respectively, thereby reducing available borrowing capacity to $1,726.5 million and $535.3 million, respectively.