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Equity Stock-Based Compensation (Details)
shares in Millions
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Employee Stock Option  
Options Granted in Period | shares 0.9
Options Granted in Period, Weighted Average Exercise Price | $ / shares $ 13.45
Restricted Stock Units (RSUs)  
Non Options Granted in Period | shares 2.5
Non Options Granted in Period, Weighted Average Grant Date Fair Value | $ / shares $ 13.53
Performance Shares [Member]  
Non Options Granted in Period | shares 1.2
Non Options Granted in Period, Weighted Average Grant Date Fair Value | $ / shares $ 11.08