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Derivatives And Hedging Activities (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017
Derivative [Line Items] |  |  |
Net unrealized loss on foreign currency derivatives designated as cash flow hedges | $ (3.1) |  |
Foreign Exchange Forward [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivative contracts | 24.9 | $ 27.3 | $ 15.8
Cash Flow Hedging [Member] | Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivative contracts | $ 370.0 |  |

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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 unrealized loss recorded in accumulated other comprehensive income pertaining to the decrease in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments to the extent that a cash flow hedge is determined to be effective. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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