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Derivatives and Risk Management Narrative (Details) - Foreign Exchange Contract - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Foreign exchange and other gains (losses) |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (loss) on derivative | $ (11.7) | $ 3.1 | $ (4.8) | $ 6.8 |
Derivatives Not Designated as Hedging Instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | $ 332.2 |  | $ 332.2 |  | $ 338.0

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