Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summarization of principal contractual obligations
Operating leases	$ 352,700,000
Purchase commitments	150,600,000
Long-term income taxes payable	108,500,000
Senior Notes	1,000,000,000
Interest Payable	873,100,000
Other contractual obligations	73,100,000
Total	2,558,000,000
Commitments Textuals [Abstract]
Rent expense	65,700,000	55,900,000	56,500,000
Accrual for estimated carrying charges or obsolete materials charges	14,800,000
Long-term debt	999,034,000	0
Indemnity-related and service-related escrows	25,100,000
Campus Build Out Commitments	30,700,000
Principal Contractual Obligations Maturity Period Current Year [Member]
Summarization of principal contractual obligations
Operating leases	57,900,000
Purchase commitments	150,600,000
Long-term income taxes payable	0
Senior Notes	0
Interest Payable	46,900,000
Other contractual obligations	63,300,000
Total	318,700,000
Principal Contractual Obligations Maturity Period Year One [Member]
Summarization of principal contractual obligations
Operating leases	50,800,000
Purchase commitments	0
Long-term income taxes payable	0
Senior Notes	0
Interest Payable	46,900,000
Other contractual obligations	4,800,000
Total	102,500,000
Principal Contractual Obligations Maturity Period Year Two [Member]
Summarization of principal contractual obligations
Operating leases	63,800,000
Purchase commitments	0
Long-term income taxes payable	0
Senior Notes	0
Interest Payable	46,900,000
Other contractual obligations	3,000,000
Total	113,700,000
Principal Contractual Obligations Maturity Period Year Three [Member]
Summarization of principal contractual obligations
Operating leases	53,400,000
Purchase commitments	0
Long-term income taxes payable	0
Senior Notes	0
Interest Payable	46,900,000
Other contractual obligations	2,000,000
Total	102,300,000
Principal Contractual Obligations Maturity Period Year Four [Member]
Summarization of principal contractual obligations
Operating leases	26,600,000
Purchase commitments	0
Long-term income taxes payable	0
Senior Notes	300,000,000
Interest Payable	41,900,000
Other contractual obligations	0
Total	368,500,000
Principal Contractual Obligations Maturity Period After Year Four [Member]
Summarization of principal contractual obligations
Operating leases	100,200,000
Purchase commitments	0
Long-term income taxes payable	0
Senior Notes	700,000,000
Interest Payable	643,600,000
Other contractual obligations	0
Total	1,443,800,000
Principal Contractual Obligations Other [Member]
Summarization of principal contractual obligations
Operating leases	0
Purchase commitments	0
Long-term income taxes payable	108,500,000
Senior Notes	0
Interest Payable	0
Other contractual obligations	0
Total	$ 108,500,000