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Derivatives and Risk Management (Narrative) (Details) - Derivatives Not Designated as Hedging Instruments - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Foreign Exchange Forward |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | $ 256.0 |  | $ 256.0 |  | $ 231.9
Foreign Exchange Contract | Foreign exchange and other gains (losses) |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (loss) on derivative | $ (4.1) | $ (5.4) | $ (11.7) | $ (7.2) |

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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 Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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