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

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

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

+ Details

Name:	us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

Name:	us-gaap_DerivativeInstrumentsGainLossLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as 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 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

+ Details

Name:	us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeRemainingMaturity1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CurrencyAxis=currency_GBP
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CurrencyAxis=currency_AUD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CurrencyAxis=currency_EUR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CurrencyAxis=currency_BRL
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CurrencyAxis=currency_XXX
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_FairValueHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CurrencyAxis=currency_CHF
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CurrencyAxis=currency_IDR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Derivative Instruments (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
Derivative Instruments (Narrative) (Details) - USD ($)	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Net assets associated with foreign currency derivatives	$ 4,900,000		$ 4,900,000		$ (8,800,000)
Maturity period of derivatives (in months)			18 months
Estimated amount of net gains (losses) associated with derivative instruments, net of tax, in next twelve months			$ 1,700,000
Designated as Hedging Instrument [Member] \| Foreign Exchange Forward [Member] \| Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	173,700,000		173,700,000
Designated as Hedging Instrument [Member] \| United Kingdom, Pounds \| Foreign Exchange Forward [Member] \| Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	81,700,000		81,700,000
Designated as Hedging Instrument [Member] \| Australia, Dollars \| Foreign Exchange Forward [Member] \| Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	33,700,000		33,700,000
Designated as Hedging Instrument [Member] \| Euro Member Countries, Euro \| Foreign Exchange Forward [Member] \| Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	22,800,000		22,800,000
Designated as Hedging Instrument [Member] \| Brazil, Brazil Real \| Foreign Exchange Forward [Member] \| Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	22,300,000		22,300,000
Designated as Hedging Instrument [Member] \| No currency \| Foreign Exchange Forward [Member] \| Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	13,200,000		13,200,000
Not Designated [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on derivatives not designated as hedging instruments	5,700,000	$ (3,500,000)	6,200,000	$ 900,000
Not Designated [Member] \| Foreign Exchange Forward [Member] \| Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	131,300,000		131,300,000
Not Designated [Member] \| United Kingdom, Pounds \| Foreign Exchange Forward [Member] \| Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	6,900,000		6,900,000
Not Designated [Member] \| Australia, Dollars \| Foreign Exchange Forward [Member] \| Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	8,400,000		8,400,000
Not Designated [Member] \| Euro Member Countries, Euro \| Foreign Exchange Forward [Member] \| Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	86,500,000		86,500,000
Not Designated [Member] \| Brazil, Brazil Real \| Foreign Exchange Forward [Member] \| Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	6,600,000		6,600,000
Not Designated [Member] \| Switzerland, Francs \| Foreign Exchange Forward [Member] \| Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	6,500,000		6,500,000
Not Designated [Member] \| Indonesia, Rupiahs \| Foreign Exchange Forward [Member] \| Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	9,600,000		9,600,000
Not Designated [Member] \| No currency \| Foreign Exchange Forward [Member] \| Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	$ 6,800,000		$ 6,800,000