Debt (Interest Rates On Outstanding Borrowings Under Term Loans) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended			12 Months Ended			6 Months Ended			6 Months Ended			6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 U.S. Term Loans	Dec. 31, 2011 U.S. Term Loans Loans Payable	Jun. 30, 2012 U.S. Term Loans Loans Payable	Nov. 14, 2011 U.S. Term Loans Loans Payable	Jun. 30, 2012 U.S. Term Loans Swapped To Fixed Rate-January 2014		Jan. 17, 2012 U.S. Term Loans Swapped To Fixed Rate-January 2014 BasisPoints	Jun. 30, 2012 U.S. Term Loans Swapped To Fixed Rate-March 2014		Mar. 19, 2012 U.S. Term Loans Swapped To Fixed Rate-March 2014 BasisPoints	Jun. 30, 2012 U.S. Term Loans Floating Rate	Jun. 19, 2012 U.S. Term Loans Swapped to Fixed Rate Two Thousand Sixteen [Member] BasisPoints
Debt Instrument [Line Items]
Outstanding	$ 4,878,125		$ 1,203,125	$ 1,250,000	$ 1,203,125		$ 500,000	[1]		$ 350,000	[1]		$ 353,125
Basis				LIBOR + 2.00%			Fixed	[1]		Fixed	[1]		LIBOR + 2.00%
Rate				2.34%			2.60%	[1]		2.45%	[1]		2.24%
Long term debt	$ 5,261,029	$ 5,168,226		$ 1,250,000	$ 1,203,125	$ 1,250,000			$ 500,000			$ 350,000		$ 750,000
Debt instrument description of fixed rate basis									0.60%			0.45%		0.91%
Debt instrument, basis spread on fixed rate									200			200		200
Debt instrument, maturity date	Sep. 15, 2015

[1] (1) Effective January 2012, $500 million of the U.S. Term Loans have been swapped to a fixed rate of 0.60% plus the specified spread under the Senior Credit Agreement (currently 200 basis points), through January 2014. Effective March 2012, an additional $350 million of the U.S. Term Loans have been swapped to a fixed rate of 0.45% plus the specified spread under the Senior Credit Agreement (currently 200 basis points), through March 2014. Effective June 2012, $750 million of the currently effective swaps have been extended to maturities ranging from March 2016 to November 2016, thereby fixing a rate of 0.91% plus the specified spread (currently 200 basis points) on the underlying U.S. Term Loans, for the extension period. These swaps have been designated as cash flow hedges of the variability in interest expense related to our variable rate debt.