Debt (Interest Rates On Outstanding Borrowings Under Term Loans) (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended		3 Months Ended					12 Months Ended
	Jan. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 Swapped To Fixed Rate-January 2014 [Member]		Mar. 31, 2012 Swapped To Fixed Rate-March 2014 [Member]		Mar. 31, 2012 Floating Rate [Member]	Dec. 31, 2011 U.S. Term Loans [Member]	Mar. 31, 2012 U.S. Term Loans [Member]	Nov. 30, 2011 U.S. Term Loans [Member]	Jan. 31, 2012 U.S. Term Loans [Member] Swapped To Fixed Rate-January 2014 [Member]	Mar. 31, 2012 U.S. Term Loans [Member] Swapped To Fixed Rate-March 2014 [Member]
Debt Instrument [Line Items]
Outstanding		$ 4,151,563		$ 500,000	[1]	$ 350,000	[1]	$ 376,563	$ 1,250,000	$ 1,226,563
Basis				Fixed	[1]	Fixed	[1]	LIBOR + 2.00%	LIBOR + 2.00%
Rate				2.60%	[1]	2.45%	[1]	2.24%	2.34%
Long term debt		$ 5,001,595	$ 5,168,226						$ 1,250,000	$ 1,226,563	$ 1,250,000	$ 500,000	$ 350,000
Debt instrument description of fixed rate basis												0.60%	0.45%
Debt instrument, basis spread on fixed rate												2.00%	2.00%
Debt Instrument Maturity Period	January 2014	March 2014

[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. These swaps have been designated as cash flow hedges of the variability in interest expense related to our variable rate debt.