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Hedging Transactions and Derivative Instruments - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative [Line Items] |  |  |
Document Fiscal Year Focus | 2018 |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | $ 0.4 | $ (0.5) | $ 0.7
Unrealized net gains (losses) arising during period | (2.0) | 3.4 | $ (2.5)
Foreign Exchange Forward [Member] | Cash Flow Hedging | Designated as Hedging Instrument |  |  |
Derivative [Line Items] |  |  |
Derivative, notional amount | $ 41.6 | $ 17.9 |

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