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Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Net assets associated with foreign currency derivatives	$ (4.3)		$ (4.3)		$ (10.7)
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			$ (2.9)
Designated as Hedging Instrument | Foreign Exchange Forward | Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	177.5		177.5
Designated as Hedging Instrument | United Kingdom, Pounds | Foreign Exchange Forward | Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	94.1		94.1
Designated as Hedging Instrument | Australia, Dollars | Foreign Exchange Forward | Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	44.4		44.4
Designated as Hedging Instrument | Euro Member Countries, Euro | Foreign Exchange Forward | Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	18.9		18.9
Designated as Hedging Instrument | Brazil, Brazil Real | Foreign Exchange Forward | Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	9.7		9.7
Designated as Hedging Instrument | Singapore, Dollars | Foreign Exchange Forward | Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	10.4		10.4
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on derivatives not designated as hedging instruments	(2.2)	$ (9.3)	(5.3)	$ (7.5)
Not Designated as Hedging Instrument | Foreign Exchange Forward | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	104.2		104.2
Not Designated as Hedging Instrument | United Kingdom, Pounds | Foreign Exchange Forward | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	8.3		8.3
Not Designated as Hedging Instrument | Nigeria, Nairas | Foreign Exchange Forward | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	7.3		7.3
Not Designated as Hedging Instrument | Thailand, Baht | Foreign Exchange Forward | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	6.8		6.8
Not Designated as Hedging Instrument | Israel, New Shekels | Foreign Exchange Forward | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	6.2		6.2
Not Designated as Hedging Instrument | Australia, Dollars | Foreign Exchange Forward | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	28.1		28.1
Not Designated as Hedging Instrument | Indonesia, Rupiahs | Foreign Exchange Forward | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	13.8		13.8
Not Designated as Hedging Instrument | Saudi Arabia, Riyals | Foreign Exchange Forward | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	13.4		13.4
Not Designated as Hedging Instrument | Euro Member Countries, Euro | Foreign Exchange Forward | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	5.3		5.3
Not Designated as Hedging Instrument | No currency | Foreign Exchange Forward | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	$ 15.0		$ 15.0

X

- 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

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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.

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