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Summary of Significant Accounting Policies, Derivatives (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Cash Flow Hedges [Member] |  |
Aggregate notional value of outstanding derivative contracts | $ 94.0 | $ 101.0
Net Investment Hedges [Member] |  |
Aggregate notional value of outstanding derivative contracts | $ 250.0 | $ 0.0

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