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Fair Value Measurements - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Transfers between Level 1 and Level 2 securities $ 0 $ 0  
Transfers in or out of Level 3 securities 0 0  
Goodwill and intangible asset impairment 0 0 $ 0
Designated as Hedging Instrument | Foreign Exchange Forward      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Notional amount of outstanding hedge to currency risk $ 48,000,000.0 $ 8,000,000.0