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Derivative Financial Instruments - Additional Information (Details) - Forward contracts £ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 GBP (£) | Aug. 28, 2018 $ / unit
Derivative [Line Items] |  |  |  |
Cash collateral held from counterparty | $ | $ 3,100,000 | $ 3,100,000 |  |
Designated as Hedging Instrument | Net Investment Hedging |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative notional amount | 400,000,000 | 400,000,000 | £ 285.8 |
Hedge ineffectiveness recorded in investment and other income | $ | $ 0 | $ 0 |  |
Designated as Hedging Instrument | Net Investment Hedging | Minimum |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, option strike price (in dollars per unit) | $ / unit |  |  |  | 1.288
Designated as Hedging Instrument | Net Investment Hedging | Maximum |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, option strike price (in dollars per unit) | $ / unit |  |  |  | 1.535

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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 Gain (loss) on hedging derivative instrument or the foreign currency transaction gain (loss) on the nonderivative hedging instrument designated as a hedge of a net investment in foreign operations related to hedge ineffectiveness, which is included in earnings in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition The strike price on the foreign currency option contract such as a put option or a call option. + References No definition available. + 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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