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Stockholders' Equity - Scheduled Vesting for Outstanding Restricted Stock Units (Details) - Restricted Stock Units - shares
shares in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Scheduled vesting — restricted stock units        
Year Ended December 31, 2019 6.9      
Year Ended December 31, 2020 5.6      
Year Ended December 31, 2021 2.4      
Year Ended December 31, 2022 0.8      
Year Ended December 31, 2023 0.1      
Thereafter 0.1      
Total 15.9 20.1 19.8 18.9