Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings.

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Long-term Borrowings, Capital Lease Obligations and License Agreements - Summary of Long-term Debt (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
	May 11, 2018	Jun. 30, 2018	Dec. 31, 2017
Long-Term Borrowings
Total debt		$ 4,027,773	$ 3,150,999
Less current portion		(12,854)	(559,050)
Noncurrent portion of long-term debt		4,014,919	2,591,949
3.800% Senior Notes due April 1, 2021
Long-Term Borrowings
Total debt		$ 745,708	$ 745,000
Debt instruments
Stated interest rate (as a percent)		3.80%	3.80%
Term		5 years	5 years
4.800% Senior Notes due April 1, 2026
Long-Term Borrowings
Total debt		$ 743,384	$ 743,042
Debt instruments
Stated interest rate (as a percent)		4.80%	4.80%
Term		10 years	10 years
2.375% Senior Notes due June 1, 2018
Long-Term Borrowings
Total debt			$ 549,532
Net proceeds	$ 1,340,000
Debt instruments
Stated interest rate (as a percent)			2.375%
Term			5 years
3.750% Senior Notes due June 1, 2023
Long-Term Borrowings
Total debt		$ 545,210	$ 544,780
Debt instruments
Stated interest rate (as a percent)		3.75%	3.75%
Term		10 years	10 years
4.000% Senior Notes due June 1, 2023
Long-Term Borrowings
Total debt		$ 545,394
Principal amount	$ 550,000
Debt instruments
Stated interest rate (as a percent)	4.00%	4.00%
Term		5 years
4.450% Senior Notes due June 1, 2028
Long-Term Borrowings
Total debt		$ 445,261
Principal amount	$ 450,000
Debt instruments
Stated interest rate (as a percent)	4.45%	4.45%
Term		10 years
Unsecured term facility, due February 23, 2021
Long-Term Borrowings
Total debt			$ 368,645
Unsecured revolving loan, due February 23, 2021
Long-Term Borrowings
Total debt			$ 200,000
Unsecured revolving loan variable, due April 2023
Long-Term Borrowings
Total debt		$ 980,000
3.760% note payable due March 20, 2020
Long-Term Borrowings
Total debt		$ 22,816
Debt instruments
Stated interest rate (as a percent)		3.76%
LIBOR \| Unsecured term facility, due February 23, 2021
Debt instruments
Stated interest rate (as a percent)			1.50%
LIBOR \| Unsecured revolving loan, due February 23, 2021
Debt instruments
Stated interest rate (as a percent)			1.30%
LIBOR \| Unsecured revolving loan variable, due April 2023
Debt instruments
Stated interest rate (as a percent)		1.30%