Debt Facilities - Senior Notes (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 14, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long term debt, gross	$ 1,504,582		$ 1,466,224
Total long term debt	9,494,941
Senior Notes [Member]
Debt Instrument [Line Items]
Long term debt, gross	7,988,275		7,002,000
Unamortized debt issuance costs	(87,664)		(78,151)
Total long term debt	$ 7,900,611		6,923,849
Senior Notes [Member] \| 5.375% Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.375%
Long term debt, gross	$ 750,000		$ 750,000
Effective interest rate	5.56%		5.56%
Senior Notes [Member] \| 5.375% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.375%
Long term debt, gross	$ 1,000,000		$ 1,000,000
Effective interest rate	5.51%		5.51%
Senior Notes [Member] \| 2.875% Euro Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	2.875%	2.875%
Long term debt, gross	$ 924,075		$ 0
Effective interest rate	3.08%		0.00%
Unamortized debt issuance costs		$ (11,600)
Senior Notes [Member] \| 5.750% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.75%
Long term debt, gross	$ 500,000		$ 500,000
Effective interest rate	5.88%		5.88%
Senior Notes [Member] \| 2.875% Euro Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	2.875%
Long term debt, gross	$ 1,232,100		$ 1,201,000
Effective interest rate	3.04%		3.04%
Senior Notes [Member] \| 5.875% Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.875%
Long term debt, gross	$ 1,100,000		$ 1,100,000
Effective interest rate	6.03%		6.03%
Senior Notes [Member] \| 2.875% Euro Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	2.875%
Long term debt, gross	$ 1,232,100		$ 1,201,000
Effective interest rate	3.04%		3.04%
Senior Notes [Member] \| 5.375% Senior Notes due 2027 [Member]
Debt Instrument [Line Items]
Interest rate (percent)	5.375%
Long term debt, gross	$ 1,250,000		$ 1,250,000
Effective interest rate	5.51%		5.51%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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