Long-Term Debt (Senior Convertible Notes) (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended					12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Senior Convertible Notes [Member]	Dec. 31, 2010 Senior Convertible Notes [Member]	Mar. 31, 2007 Senior Convertible Notes [Member]	Dec. 31, 2011 Cash Convertible Notes [Member]	Dec. 31, 2010 Cash Convertible Notes [Member]	Sep. 30, 2008 Cash Convertible Notes [Member]	Sep. 15, 2008 Cash Convertible Notes [Member]	Dec. 31, 2011 Senior And Senior Convertible Notes [Member]	Jan. 31, 2012 U.S. Term Loans [Member]	Dec. 31, 2011 U.S. Term Loans [Member]	Nov. 30, 2011 U.S. Term Loans [Member]	Dec. 31, 2011 2018 Senior Notes [Member]	Jan. 31, 2011 2018 Senior Notes [Member]	Dec. 31, 2010 2018 Senior Notes [Member]	Nov. 30, 2010 2018 Senior Notes [Member]
Debt Instrument [Line Items]
Long term debt	$ 5,168,226,000	$ 5,168,226,000	$ 5,268,185,000	$ 593,983,000	$ 565,476,000	$ 600,000,000	$ 937,160,000	$ 928,344,000	$ 575,000,000	$ 575,000,000		$ 500,000,000	$ 500,000,000	$ 1,250,000,000	$ 818,774,000	$ 500,000,000	$ 787,728,000	$ 800,000,000
Fixed interest rate of debt						1.25%	3.75%								6.00%
Percentage change threshold to adjust conversion rate	1.00%
Discount on debt				6,000,000	34,500,000		97,800,000	119,100,000							11,000,000
Effective interest rate				6.40%			9.50%
Exercise price of warrants issued in a concurrent equity offering						$ 19.50
Initial conversion reference rate, per $1,000 principal amount of notes				44.5931			75.0751
Equivalent initial conversion reference price, per share				$ 22.43			$ 13.32
Convertible hedge note transactions, net cost		17,246,000	29,084,000	80,600,000
Effective conversion rate				41.678
Adjusted effective conversion ratio				41.539
Number of shares for purchased call options				26.8
Unamortized financing fees	52,400,000	52,400,000	61,800,000
Deferred financing fees written off		20.1
Debt instrument fair value					3,060,000,000		1,000,000,000	996,200,000			3,150,000,000
Letters of credit outstanding	$ 79,800,000	$ 79,800,000	$ 85,400,000
Conversion price of notes, per share				$ 23.99