Long-Term Debt And Borrowing Arrangements (3.50% Convertible Notes) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended										9 Months Ended		1 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Mar. 31, 2011 Minimum [Member] 3.50% Convertible Notes (Due May 2012) [Member]	Mar. 31, 2010 Minimum [Member] 3.50% Convertible Notes (Due May 2012) [Member]	Mar. 31, 2011 Maximum [Member] 3.50% Convertible Notes (Due May 2012) [Member]	Mar. 31, 2010 Maximum [Member] 3.50% Convertible Notes (Due May 2012) [Member]	Sep. 30, 2011 Bifurcated Conversion Feature [Member] 3.50% Convertible Notes (Due May 2012) [Member]	Dec. 31, 2010 Bifurcated Conversion Feature [Member] 3.50% Convertible Notes (Due May 2012) [Member]	Sep. 30, 2010 Bifurcated Conversion Feature [Member] 3.50% Convertible Notes (Due May 2012) [Member]	Sep. 30, 2011 Convertible Notes Related [Member] 3.50% Convertible Notes (Due May 2012) [Member]	Dec. 31, 2010 Convertible Notes Related [Member] 3.50% Convertible Notes (Due May 2012) [Member]	Sep. 30, 2010 Convertible Notes Related [Member] 3.50% Convertible Notes (Due May 2012) [Member]	Sep. 30, 2011 Call Option [Member] 3.50% Convertible Notes (Due May 2012) [Member]	Sep. 30, 2011 Warrant [Member] 3.50% Convertible Notes (Due May 2012) [Member]	May 31, 2009 3.50% Convertible Notes (Due May 2012) [Member]	Sep. 30, 2011 3.50% Convertible Notes (Due May 2012) [Member]	Dec. 31, 2010 3.50% Convertible Notes (Due May 2012) [Member]	Sep. 30, 2010 3.50% Convertible Notes (Due May 2012) [Member]
Debt instrument face value																	$ 230,000,000
Cash dividends declared per share	$ 0.15	$ 0.12	$ 0.45	$ 0.36	$ 0.12	$ 0.04	$ 0.15	$ 0.12									$ 0.04
Convertible notes coversion ratio																		80.4364
Convertible note principal amount per converted share																		1,000
Convertible notes conversion ratio															$ 12.43	$ 19.68		$ 12.43
Repurchase of convertible notes, carrying value									156,000,000	138,000,000	107,000,000	95,000,000	101,000,000	81,000,000				251,000,000	239,000,000	188,000,000
Repurchase of convertible notes																		262,000,000
Loss on repurchase of convertible notes																12,000,000
Payment for (proceed from) settlement of derivative contract			(155,000,000)	(105,000,000)											155,000,000			219,000,000
Loss on settlement of derivative contract			$ 1,000,000
Shares related to warrants																1