Financial Instruments (Narrative) (Details)	12 Months Ended								12 Months Ended				12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2010 USD ($)	Jun. 30, 2008 GBP (£)	Dec. 31, 2001	Dec. 31, 2011 Commodity Contract [Member] USD ($)	Dec. 31, 2010 Commodity Contract [Member] USD ($)	Sep. 30, 2008 Senior Notes Due In Two Thousand Thirteen And Eighteen [Member] USD ($)	Dec. 31, 2011 Senior Notes Due In Two Thousand Thirteen And Eighteen [Member] Third Quarter 2008 Interest Rate Locks [Member] USD ($)	Dec. 31, 2010 Senior Notes Due In Two Thousand Thirteen And Eighteen [Member] Third Quarter 2008 Interest Rate Locks [Member] USD ($)	Mar. 31, 2005 Senior Notes Due in 2015 [Member] USD ($)	Dec. 31, 2001 Senior Notes Due in 2015 [Member]	Dec. 31, 2011 Senior Notes Due In 2015 [Member] March 2005 Interest Rate Locks [Member] USD ($)	Dec. 31, 2010 Senior Notes Due In 2015 [Member] March 2005 Interest Rate Locks [Member] USD ($)	Dec. 31, 2011 Designated as Hedging Instrument [Member] USD ($)	Dec. 31, 2010 Designated as Hedging Instrument [Member] USD ($)
Notional amounts of currency derivatives	$ 1,818,500,000		$ 1,280,400,000
Accumulated other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(553,600,000)		(325,000,000)												2,300,000	300,000
Currency derivatives expected to be reclassified into earnings over the next twelve months	2,300,000
Approximate maximum term of currency derivatives, in months	12
Debt Instrument, Face Amount				60,000,000				1,400,000,000			300,000,000
Debt Instrument, Interest Rate, Stated Percentage				8.25%	11.00%							4.75%
Deferred losses remaining in AOCI related to the interest rate locks									(9,000,000)	(10,800,000)			(4,300,000)	(5,400,000)
Amount expected to be reclassified into interest expense over the next twelve months									1,800,000				1,200,000
Cash Outflow Due To Decrease In Net Interests In Receivables Sold		63,000,000
Commodity derivatives outstanding						$ 0	$ 0