Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income before income taxes (benefit):
Domestic	$ 1,408,900,000	$ 846,400,000	$ 1,073,800,000
Foreign	302,300,000	383,500,000	258,900,000
Total	1,711,214,000	1,229,906,000	1,332,679,000
Current
Federal	231,700,000	357,700,000	439,900,000
State	15,100,000	19,600,000	3,100,000
Foreign	44,100,000	35,400,000	50,000,000
Total	290,900,000	412,700,000	493,000,000
Deferred
Federal	160,900,000	(70,600,000)	(94,800,000)
State	(8,100,000)	(6,600,000)	(39,000,000)
Foreign	800,000	(4,200,000)	(3,600,000)
Total	153,576,000	(81,410,000)	(137,351,000)
Total income tax expense	$ 444,528,000	$ 331,333,000	$ 355,617,000