Commitments and Contingencies (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Summarization of principal contractual obligations
Operating leases	$ 286,700,000		$ 286,700,000
Operating Leases, Future Minimum Payments, Remainder of Fiscal Year	30,300,000		30,300,000
Operating Leases, Future Minimum Payments, Due in Two Years	50,000,000		50,000,000
Operating Leases, Future Minimum Payments, Due in Three Years	43,600,000		43,600,000
Operating Leases, Future Minimum Payments, Due in Four Years	35,400,000		35,400,000
Operating Leases, Future Minimum Payments, Due in Five Years	26,900,000		26,900,000
Operating Leases, Future Minimum Payments, Due Thereafter	100,500,000		100,500,000
Purchase Obligation	122,000,000		122,000,000
Purchase Obligation, Remainer of Fiscal Year	122,000,000		122,000,000
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	108,200,000		108,200,000
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	849,700,000		849,700,000
Long-term Debt, Maturities, Repayments of Interest, Remainder of Fiscal Year	23,500,000		23,500,000
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	101,800,000		101,800,000
Other contractual obligations, Remainder of Fiscal Year	89,700,000		89,700,000
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	2,468,400,000		2,468,400,000
Contractual Obligation, Remainder of Fiscal Year	265,500,000		265,500,000
Contractual Obligation, Due in Second Year	103,200,000		103,200,000
Contractual Obligation, Due in Third Year	93,900,000		93,900,000
Contractual Obligation, Due in Fourth Year	84,700,000		84,700,000
Contractual Obligation, Due in Fifth Year	368,800,000		368,800,000
Contractual Obligation, Due after Fifth Year	1,444,100,000		1,444,100,000
Commitments Textuals [Abstract]
Rent expense	15,800,000	17,800,000	31,500,000	32,600,000
Accrual for estimated carrying charges or obsolete materials charges	15,900,000		15,900,000
Long-term debt	999,108,000		999,108,000		999,034,000
Long-term Debt, Gross	1,000,000,000		1,000,000,000
Indemnity-related and service-related escrows	28,800,000		28,800,000
Campus build out commitments	58,100,000		58,100,000
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%