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Stockholders' Equity - Scheduled Vesting for Outstanding Restricted Stock Units (Details) - Restricted Stock Units - shares
shares in Millions
Sep. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Three Months Ended December 31, 2017 2.2  
Year Ended December 31, 2018 7.3  
Year Ended December 31, 2019 7.0  
Year Ended December 31, 2020 3.1  
Year Ended December 31, 2021 1.1  
Thereafter 0.4  
Total 21.1 19.8