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Fair Value of Financial Instruments - Derivatives (Details) € in Millions, £ in Millions | Sep. 30, 2017 GBP (£) contract | Sep. 30, 2017 EUR (€) contract | Sep. 30, 2017 USD ($) contract | Dec. 31, 2016 GBP (£) contract | Dec. 31, 2016 EUR (€) contract | Dec. 31, 2016 USD ($) contract
--- | --- | --- | --- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Foreign currency contract, asset, fair value disclosure |  |  |  |  |  | $ 0
Forward Contracts |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, number of instruments held | contract | 2 | 2 | 2 | 2 | 2 | 2
Derivative, notional amount | £ 4.8 | € 6.7 |  | £ 4.6 | € 7.6 |
Foreign currency contract, asset, fair value disclosure |  |  | $ 0 |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps. + References No definition available. + Details
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- Details
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