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Financial Instruments (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Cash |  |
Derivative Financial Instruments |  |
Deferred compensation, Rabbi Trust | $ 10.7 | $ 13.2
Short-term Investments |  |
Derivative Financial Instruments |  |
Deferred compensation, Rabbi Trust | 4.8 | 4.0
Foreign Exchange Forward | Designated as Hedging Instrument |  |
Derivative Financial Instruments |  |
Fair value | 0.1 | (0.2)
Notional amount | 10.5 | 22.3
Foreign Exchange Forward | Not Designated as Hedging Instrument |  |
Derivative Financial Instruments |  |
Fair value | (2.0) | 0.2
Notional amount | $ 55.6 | $ 38.6
Maximum | Foreign Exchange Forward | Not Designated as Hedging Instrument |  |
Derivative Financial Instruments |  |
Maturity term | 1 year |
Maximum | Cash Flow Hedging | Foreign Exchange Forward | Designated as Hedging Instrument |  |
Derivative Financial Instruments |  |
Maturity term | 1 year |

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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 Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date. + References No definition available. + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details
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- Definition Period the derivative contract is outstanding, 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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