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Stock-Based Compensation Plans and Employee Benefits - 401(k) Plan (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Gross contributions made by the Company $ 0.1 $ 0.1 $ 0.8 $ 0.9