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Debt (Details) € in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 EUR (€) | Dec. 31, 2014 USD ($) | Sep. 30, 2015 USD ($)
Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior Note Agreements, aggregate principal amount |  |  | $ 600,000,000
Senior notes payable, consolidated leverage ratio, maximum | 3.5 |  |
Series A Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes payable |  | $ 75,000,000 |
Senior notes payable, stated interest rate |  | 3.25% |
Senior notes payable, term |  | 7 years |
Series B Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes payable |  | $ 75,000,000 |
Senior notes payable, stated interest rate |  | 3.72% |
Senior notes payable, term |  | 12 years |
Series C Senior Note [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes payable | € 88.9 |  | $ 100,000,000
Senior notes payable, stated interest rate | 1.785% |  | 1.785%
Shelf Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes payable |  |  | $ 75,000,000
Senior notes payable, term | 12 years |  |

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- Definition 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=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References 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 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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