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Stockholders' Equity - Scheduled Vesting for Outstanding Restricted Stock Units (Details) - Restricted Stock Units - shares
shares in Millions
Jun. 30, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Six Months Ended December 31, 2019 2.7  
Year Ended December 31, 2020 5.8  
Year Ended December 31, 2021 5.1  
Year Ended December 31, 2022 2.0  
Year Ended December 31, 2023 0.5  
Thereafter 0.1  
Total 16.2 14.3