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Debt - Long Term Debt Outstanding (Details)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 USD ($)	Sep. 30, 2016	Jun. 30, 2015 EUR (€)
Debt Instrument [Line Items]
Total		$ 4,249,054,000		$ 3,159,336,000
Current maturities of long-term debt		(500,000,000)		0
Long-term debt, excluding current maturities		3,749,054,000		3,159,336,000
7.456% Senior Notes Due 2018
Debt Instrument [Line Items]
Total		$ 500,000,000		$ 500,000,000
Senior notes, interest rate	7.456%	7.456%	7.456%	7.456%
Senior unsecured notes principal amount		$ 500,000,000
5.95% Senior Notes Due 2020
Debt Instrument [Line Items]
Total		$ 747,829,000		$ 747,020,000
Senior notes, interest rate	5.95%	5.95%	5.95%	5.95%	5.95%
Senior unsecured notes principal amount		$ 750,000,000
2.5% Senior Notes Due 2022
Debt Instrument [Line Items]
Total		$ 774,882,000		$ 677,503,000
Senior notes, interest rate	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Senior unsecured notes principal amount | €	€ 650,000,000		€ 650,000,000			€ 650,000,000
4.5% Senior Notes Due 2024
Debt Instrument [Line Items]
Total		$ 495,159,000		$ 494,472,000
Senior notes, interest rate	4.50%	4.50%	4.50%	4.50%	4.50%
Senior unsecured notes principal amount		$ 500,000,000
5.0% Senior Notes Due 2026
Debt Instrument [Line Items]
Total		$ 741,319,000		$ 740,341,000
Senior notes, interest rate	5.00%	5.00%	5.00%	5.00%	5.00%
Senior unsecured notes principal amount		$ 750,000,000
3.8% Senior Notes Due 2028
Debt Instrument [Line Items]
Total		$ 989,865,000		$ 0
Senior notes, interest rate	3.80%	3.80%	3.80%	3.80%
Senior unsecured notes principal amount		$ 1,000,000,000

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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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

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