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Debt (Details)	Jun. 22, 2018 EUR (€)
Debt Instrument [Line Items]
Proceeds from debt	€ 495,700,000
Senior Notes | Notes Due June 2026 - 1.750%
Debt Instrument [Line Items]
Principal amount	€ 500,000,000
Interest rate	1.75%
Debt instrument, discount percentage	99.564%
Effective rate	1.809%
Senior Notes | Notes due June 2018
Debt Instrument [Line Items]
Principal amount	€ 350,000,000

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

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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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-Section 45
-Paragraph 2
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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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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(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

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-SubTopic 10
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-Subparagraph (SX 210.5-02.22(a)(1))
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