Income Taxes (Income Tax Provision) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Federal	$ 170,000,000	$ 168,300,000	$ 182,800,000
Foreign	23,300,000	31,800,000	33,600,000
State	7,800,000	10,300,000	8,700,000
Current provision, total	201,100,000	210,400,000	225,100,000
Federal	(18,900,000)	3,700,000	(13,300,000)
Foreign	(2,700,000)	(7,200,000)	(100,000)
State	3,300,000	1,200,000	(1,600,000)
Deferred (benefit) provision, total	(18,300,000)	(2,300,000)	(15,000,000)
Income tax provision	$ 182,800,000	$ 208,100,000	$ 210,100,000