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Summary of Significant Accounting Policies and Estimates - Goodwill (Details)
unit in Millions
 12 Months Ended
Dec. 31, 2020
unit
Dec. 31, 2019
unit
Dec. 31, 2018
geographic_region
Goodwill [Line Items]      
Number of geographic regions | geographic_region     3
Weight applied to the income approach for determination of the fair value of reporting units     80.00%
Weight applied to the market approach for determination of the fair value of reporting units     20.00%
Forecast      
Goodwill [Line Items]      
Estimated industry sales (in units sold) | unit 16.7 16.8