End date of current fiscal year in the format --MM-DD.

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This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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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

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Average period remaining before foreign currency exchange rate derivatives mature or expire, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Face (par) amount of debt instrument at time of issuance.

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Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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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.

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Derivative Instruments and Hedging Activities (Details)	12 Months Ended
Derivative Instruments and Hedging Activities (Details)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 EUR (€)	Nov. 15, 2016 EUR (€)	Oct. 17, 2016 EUR (€)
Derivative [Line Items]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	$ 100,000	$ 5,800,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	$ 200,000	200,000	$ (1,200,000)
Current Fiscal Year End Date	--12-31
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	$ 2,000,000
Nonoperating gains	$ 1,900,000	(200,000)
Document Fiscal Year Focus	2017
Other non-operating expense, net [Member]
Derivative [Line Items]
Derivative instruments, net gain	$ (6,000,000)	1,600,000
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Derivative [Line Items]
Comprehensive income/(loss) before reclassification, net	200,000	0	(1,300,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	(200,000)	$ (100,000)
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount of derivative	323,000,000
Foreign exchange contract [Member] \| Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount of derivative \| €				€ 308,000,000	€ 440,000,000
Derivative instruments, net gain	(200,000)	9,300,000
ERROR in label resolution.
Derivative [Line Items]
Notional amount of derivative	10,000,000
Foreign Exchange Forward [Member]
Derivative [Line Items]
Notional amount of derivative	$ 497,700,000	$ 154,100,000		€ 416,400,000	€ 146,900,000
Average duration of derivatives	1 month
Senior EUR Notes [Member] \| Senior Notes [Member]
Derivative [Line Items]
Face value \| €							€ 440,000,000
Senior EUR Notes [Member] \| Senior Notes [Member] \| EUR Senior Notes, Partial Foreign Currency Hedge [Member]
Derivative [Line Items]
Face value \| €						€ 440,000,000