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Derivative Financial Instruments - Narrative (Details) - 9 months ended Sep. 30, 2017 $ in Millions | USD ($) | GBP (£)
--- | --- | ---
Net Investment | Facility and 2015 Term Loan |  |
Derivative [Line Items] |  |
Borrowings designated as hedge of net investment | £ |  | £ 150,000,000
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 | $ | $ 2 |
Cross currency swap | Maximum |  |
Derivative [Line Items] |  |
Estimate change in fair value of derivative for assumption of one percentage point change in the interest rate | $ | $ 2 |
Cross currency swap | Net Investment |  |
Derivative [Line Items] |  |
Notional | £ |  | £ 105,000,000

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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 Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: 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=84234895&loc=SL5579245-113959 Reference 2: 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=84234895&loc=SL5580258-113959 + Details
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- Definition Fair value of all derivative liabilities designated as fair value hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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