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Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | $ 5.8 |  | $ 6.8
Maturity period of derivatives (in months) | 18 months |  |
Estimated amount of net gains associated with derivative instruments, net of tax | $ 4.1 |  |
Not Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 1.8 | $ 0.5 |
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Notional Amount | 186.3 |  |
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Notional Amount | 133.9 |  |
United Kingdom, Pounds | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Notional Amount | 81.9 |  |
United Kingdom, Pounds | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Notional Amount | 8.7 |  |
Australia, Dollars | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Notional Amount | 54.7 |  |
Australia, Dollars | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Notional Amount | 15.2 |  |
Euro Member Countries, Euro | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Notional Amount | 21.3 |  |
Euro Member Countries, Euro | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Notional Amount | 101.3 |  |
Brazil, Brazil Real | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Notional Amount | 15.2 |  |
Singapore, Dollars | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Notional Amount | 12.5 |  |
Singapore, Dollars | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Notional Amount | 7.1 |  |
No currency | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Notional Amount | 0.7 |  |
No currency | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Notional Amount | 1.6 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | $ 5.8 |  | $ 6.8

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- 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 + Details
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- 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
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- 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
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- 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
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