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Summary of Significant Accounting Policies - Foreign Currency Translation (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Summary of Significant Accounting Policies
Unrealized gain related to foreign currency translation included in AOCI	$ 2.6	$ 2.6

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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