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Stockholders' Equity - Scheduled Vesting for Outstanding Restricted Stock Units (Details) - Restricted Stock Units - shares
shares in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Scheduled vesting — restricted stock units        
2021 5.7      
2022 5.4      
2023 2.7      
2024 1.2      
2025 0.1      
Thereafter 0.1      
Total 15.2 14.3 15.9 20.1