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Long-Term Debt (Long-Term Debt Maturities) (Details) (USD $)
9 Months Ended
Sep. 30, 2011
Long-Term Debt Disclosure [Abstract] 
2011 (remainder)$ 0
20120
20130
2014445,000,000
20150
Thereafter1,350,000,000[1]
Total1,795,000,000
Unamortized premium$ 5,400,000
[1]Excludes unamortized premiums of $5.4 million as of September 30, 2011.