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Derivative Instruments and Hedging Activities (Forward Foreign Exchange Contracts) (Details) - Forward exchange contracts £ in Millions, $ in Millions, $ in Millions, $ in Millions | Dec. 31, 2019 USD ($) | Dec. 31, 2019 AUD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 GBP (£)
--- | --- | --- | --- | ---
British Pounds Sterling |  |  |  |
Derivative [Line Items] |  |  |  |
Foreign Currency Amount | £ |  |  |  | £ 11.7
US Dollar Amount | $ 16.0 |  |  |
Weighted average exchange rate per $1 USD | 0.73 | 0.73 | 0.73 | 0.73
Canada, Dollars |  |  |  |
Derivative [Line Items] |  |  |  |
Foreign Currency Amount |  |  | $ 9.5 |
US Dollar Amount | $ 7.7 |  |  |
Weighted average exchange rate per $1 USD | 1.24 | 1.24 | 1.24 | 1.24
Australia, Dollars |  |  |  |
Derivative [Line Items] |  |  |  |
Foreign Currency Amount |  | $ 3.5 |  |
US Dollar Amount | $ 2.8 |  |  |
Weighted average exchange rate per $1 USD | 1.25 | 1.25 | 1.25 | 1.25

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