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Derivative Financial Instruments - Narrative (Details) - 3 months ended Mar. 31, 2019 £ in Millions, $ in Millions | USD ($) | GBP (£)
--- | --- | ---
Net Investment | Facility and 2015 Term Loan |  |
Derivative [Line Items] |  |
Borrowings designated as hedge of net investment | £ |  | £ 55
Interest-rate swap contracts | Maximum |  |
Derivative [Line Items] |  |
Estimate change in fair value of derivative for assumption of one percentage point change in the interest rate | $ | $ 1 |

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- Definition Amount of estimate change in fair value of each of the underlying derivative instruments assuming one percentage point change in the underlying derivative instruments + 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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- Definition Fair value of all derivative liabilities designated as fair value hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Details
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- Details
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- Details
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- Details
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