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Stockholders' Equity - Scheduled Vesting for Outstanding Restricted Stock Units (Details) - Restricted Stock Units - shares
shares in Millions
Jun. 30, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
2021 2.6  
2022 5.6  
2023 5.1  
2024 1.8  
2025 0.4  
Thereafter 0.2  
Total 15.7 15.2