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Stockholders' Equity - Scheduled Vesting for Outstanding Restricted Stock Units (Details) - Restricted Stock Units - shares
shares in Millions
Sep. 30, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Six Months Ended December 31, 2019 2.0  
Year Ended December 31, 2020 6.0  
Year Ended December 31, 2021 5.0  
Year Ended December 31, 2022 1.8  
Year Ended December 31, 2023 0.8  
Thereafter 0.2  
Total 15.8 15.9