Long-Term Debt (Convertible Debt Instruments and Terms) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 Days
Subordinated Convertible Notes Due 2029 [Member]
Debt Instrument [Line Items]
Contingent, conversion price	$ 47.78	[1]
Debt instrument, beginning date	Aug. 31, 2029	[1]
Conversion price per share	$ 36.75	[1]
Conversion, shares per $1,000 principal amount of notes	27.2109	[1]
Principal amount of notes	$ 1,000	[1]
Common stock covered under note hedges	11,686,075	[1]
Consecutive trading days	30
Subordinated Convertible Notes Due 2029 [Member] | Make-Whole [Member]
Debt Instrument [Line Items]
Common stock covered under note hedges	14,315,419	[1]
Subordinated Convertible Notes Due 2029 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Trading days	20
1.00% Senior Convertible Notes Due 2012 [Member]
Debt Instrument [Line Items]
Contingent, conversion price	$ 109.11	[1]
Debt instrument, beginning date	Sep. 15, 2012	[1]
Conversion price per share	$ 83.93	[1]
Conversion, shares per $1,000 principal amount of notes	11.9142	[1]
Principal amount of notes	1,000	[1]
Common stock covered under note hedges	5,659,245	[1]
Consecutive trading days	30
1.00% Senior Convertible Notes Due 2012 [Member] | Make-Whole [Member]
Debt Instrument [Line Items]
Common stock covered under note hedges	7,215,535	[1]
1.00% Senior Convertible Notes Due 2012 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Trading days	20
0.875% Convertible Notes Due 2013 [Member]
Debt Instrument [Line Items]
Contingent, conversion price	$ 65.47	[1]
Debt instrument, beginning date	Oct. 15, 2013	[1]
Conversion price per share	$ 50.36	[1]
Conversion, shares per $1,000 principal amount of notes	19.856	[1]
Principal amount of notes	$ 1,000	[1]
Common stock covered under note hedges	7,048,880	[1]
Consecutive trading days	30
0.875% Convertible Notes Due 2013 [Member] | Make-Whole [Member]
Debt Instrument [Line Items]
Common stock covered under note hedges	8,987,322	[1]
0.875% Convertible Notes Due 2013 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Trading days	20

[1] In the event of a “fundamental change” or exceeding the aforementioned average pricing thresholds, the Company would be required to classify the amount outstanding as a current liability.