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Significant Accounting Policies - Goodwill and Indefinite-Lived Intangibles (Details)	12 Months Ended
	Dec. 31, 2020
Significant Accounting Policies
Number of trading days used in adjusted market capitalization calculation	10 days

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- Definition

Number of trading days for calculating the average share price of the Company's common stock prior to the measurement date used in adjusted market capitalization calculation.

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