Commitments and Contingencies (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Summarization of principal contractual obligations
Operating leases	$ 280,600,000		$ 280,600,000
Operating Leases, Future Minimum Payments, Remainder of Fiscal Year	15,900,000		15,900,000
Operating Leases, Future Minimum Payments, Due in Two Years	52,100,000		52,100,000
Operating Leases, Future Minimum Payments, Due in Three Years	45,600,000		45,600,000
Operating Leases, Future Minimum Payments, Due in Four Years	37,200,000		37,200,000
Operating Leases, Future Minimum Payments, Due in Five Years	28,600,000		28,600,000
Operating Leases, Future Minimum Payments, Due Thereafter	101,200,000		101,200,000
Purchase Obligation	105,000,000		105,000,000
Purchase Obligation, Remainer of Fiscal Year	105,000,000		105,000,000
Purchase Obligation, Due in Second Year	0		0
Purchase Obligation, Due in Third Year	0		0
Purchase Obligation, Due in Fourth Year	0		0
Purchase Obligation, Due in Fifth Year	0		0
Purchase Obligation, Due after Fifth Year	0		0
Tax liabilities	116,900,000		116,900,000
Long-term Debt, Gross	1,000,000,000		1,000,000,000
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	0		0
Long-term Debt, Maturities, Repayments of Principal in Year Two	0		0
Long-term Debt, Maturities, Repayments of Principal in Year Three	0		0
Long-term Debt, Maturities, Repayments of Principal in Year Four	0		0
Long-term Debt, Maturities, Repayments of Principal in Year Five	300,000,000		300,000,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	700,000,000		700,000,000
Long-term Debt, Future Interest Payment Due	826,200,000		826,200,000
Long-term Debt, Maturities, Repayments of Interest, Remainder of Fiscal Year	0		0
Long-term Debt, Maturities, Repayments of Interest in Year Two	46,900,000		46,900,000
Long-term Debt, Maturities, Repayments of Interest in Year Three	46,900,000		46,900,000
Long-term Debt, Maturities, Repayments of Interest in Year Four	46,900,000		46,900,000
Long-term Debt, Maturities, Repayments of Interest in Year Five	41,900,000		41,900,000
Long-term Debt, Maturities, Repayments of Interest after Year Five	643,600,000		643,600,000
Other contractual obligations	143,300,000		143,300,000
Other contractual obligations, Remainder of Fiscal Year	131,200,000		131,200,000
Other contractual obligations, Due in Second Year	6,300,000		6,300,000
Other contractual obligations, Due in Third Year	3,400,000		3,400,000
Other contractual obligations, Due in Fourth Year	2,400,000		2,400,000
Other contractual obligations, Due in Fifth Year	0		0
Other contractual obligations, Due after Fifth Year	0		0
Total	2,472,000,000		2,472,000,000
Contractual Obligation, Remainder of Fiscal Year	252,100,000		252,100,000
Contractual Obligation, Due in Second Year	105,300,000		105,300,000
Contractual Obligation, Due in Third Year	95,900,000		95,900,000
Contractual Obligation, Due in Fourth Year	86,500,000		86,500,000
Contractual Obligation, Due in Fifth Year	370,500,000		370,500,000
Contractual Obligation, Due after Fifth Year	1,444,800,000		1,444,800,000
Commitments Textuals [Abstract]
Rent expense	15,700,000	17,000,000	47,200,000	49,600,000
Accrual for estimated carrying charges or obsolete materials charges	18,500,000		18,500,000
Long-term debt	999,145,000		999,145,000		999,034,000
Long-term Debt, Gross	1,000,000,000		1,000,000,000
Indemnity-related and service-related escrows	48,700,000		48,700,000
Campus build out commitments	81,100,000		81,100,000
Fixed Rate Note Due 2016 [Member]
Summarization of principal contractual obligations
Long-term Debt, Gross	300,000,000		300,000,000
Commitments Textuals [Abstract]
Long-term Debt, Gross	300,000,000		300,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.10%		3.10%
Fixed Rate Note Due 2021 [Member]
Summarization of principal contractual obligations
Long-term Debt, Gross	300,000,000		300,000,000
Commitments Textuals [Abstract]
Long-term Debt, Gross	300,000,000		300,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.60%		4.60%
Fixed Rate Note Due 2041 [Member]
Summarization of principal contractual obligations
Long-term Debt, Gross	400,000,000		400,000,000
Commitments Textuals [Abstract]
Long-term Debt, Gross	$ 400,000,000		$ 400,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.95%		5.95%