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 $)
6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Face Amount $ 4,575,000,000 $ 2,325,000,000
Total Long-term Debt 3,898,800,000 1,713,100,000
Term Loan $1.25 Billion [Member]
   
Type Variable  
Average Annual Interest Rate 2.052%  
Final Maturity 2016  
Face Amount 1,250,000,000  
Total Long-term Debt 1,187,500,000  
Amount included in Current portion of loan 62,500,000  
Senior Notes $700 Million due 2021 [Member]
   
Type Fixed  
Average Annual Interest Rate 4.875%  
Final Maturity 2021  
Face Amount 700,000,000  
Total Long-term Debt 699,300,000  
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 499,000,000 499,000,000
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
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  
Unamortized discount 9,900,000  
Senior Notes $400 Million [Member]
   
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 397,900,000 397,800,000
Unamortized discount 2,100,000 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
Final Maturity 2012 2012
Face Amount 600,000,000 600,000,000
Total Long-term Debt 0 0
Principal amount of letter of credit obligations 66,600,000 64,700,000
Credit facility remaining capacity 533,400,000 535,300,000
Private Placement [Member]
   
Face Amount $ 325,000,000 $ 325,000,000