Commitments and Contingencies (Details) ft² in Thousands		3 Months Ended		6 Months Ended
	Jul. 10, 2015 USD ($) ft²	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Feb. 29, 2016 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2011 USD ($)
Summarization of principal contractual obligations
Future minimum payments under the non-cancelable operating leases	$ 118,100,000	$ 129,400,000		$ 129,400,000
Rent expense		10,500,000	$ 10,900,000	19,600,000	$ 22,400,000
Lease term, option to extend	20 years
Square feet of leased space | ft²	63
Term of lease	10 years
Tenant allowance	$ 6,000,000
Property and equipment, net		1,066,600,000		1,066,600,000			$ 1,021,000,000
Total purchase commitments		578,000,000		578,000,000
Accrual for estimated carrying charges or obsolete materials charges		19,700,000		19,700,000
Long-term debt, carrying value		2,132,500,000		2,132,500,000			1,637,500,000
Indemnity-related and service-related escrows		85,300,000		85,300,000
Campus build out commitments		3,500,000		3,500,000
Other contractual obligations		42,100,000		42,100,000
Long-term income taxes payable		199,800,000		199,800,000			187,300,000
Construction in Progress [Member]
Summarization of principal contractual obligations
Property and equipment, net							$ 45,600,000
Addition to build-to-suit asset				15,300,000
Assets Held under Capital Leases [Member]
Summarization of principal contractual obligations
Property and equipment, net		60,900,000		60,900,000
Fixed Rate Note Due 2019 [Member]
Summarization of principal contractual obligations
Long-term debt, gross		$ 350,000,000		$ 350,000,000		$ 350,000,000
Short-term and Long-term debt, stated interest rate		3.125%		3.125%		3.125%
Fixed rate note due 2020 [Member]
Summarization of principal contractual obligations
Long-term debt, gross		$ 300,000,000		$ 300,000,000				$ 300,000,000
Short-term and Long-term debt, stated interest rate		3.30%		3.30%				3.30%
Fixed rate note due 2021 [Member]
Summarization of principal contractual obligations
Long-term debt, gross		$ 300,000,000		$ 300,000,000					$ 300,000,000
Short-term and Long-term debt, stated interest rate		4.60%		4.60%					4.60%
Fixed rate note due 2024 [Member]
Summarization of principal contractual obligations
Long-term debt, gross		$ 500,000,000		$ 500,000,000
Short-term and Long-term debt, stated interest rate		4.50%		4.50%
Fixed rate note due 2025 [Member]
Summarization of principal contractual obligations
Long-term debt, gross		$ 300,000,000		$ 300,000,000				$ 300,000,000
Short-term and Long-term debt, stated interest rate		4.35%		4.35%				4.35%
Fixed rate note due 2041 [Member]
Summarization of principal contractual obligations
Long-term debt, gross		$ 400,000,000		$ 400,000,000					$ 400,000,000
Short-term and Long-term debt, stated interest rate		5.95%		5.95%					5.95%
Minimum [Member]
Summarization of principal contractual obligations
Increment for lease extension	5 years
Maximum [Member]
Summarization of principal contractual obligations
Increment for lease extension	10 years