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Share-Based Compensation and Equity - Restricted Stock Unit Activity (Details) - Restricted Stock Units [Member] - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restricted Stock Units      
Unvested, Shares, Beginning balance 1.6    
Forfeited, Shares (0.1)    
Vested, Shares (0.8)    
Granted, Shares [1] 1.5    
Unvested, Shares, Ending balance 2.2 1.6  
Unvested, Weighted-average grant-date fair value, Beginning balance $ 19.66    
Forfeited, Weighted-average grant-date fair value 19.63    
Vested, Weighted-average grant-date fair value 20.24    
Granted, Weighted-average grant-date fair value 5.05 [1] $ 17.34 $ 26.81
Unvested, Weighted-average grant-date fair value, Ending balance $ 9.99 $ 19.66  
One year vest [Member]      
Restricted Stock Units      
Granted, Shares 0.1    
Minimum | One year vest [Member]      
Restricted Stock Units      
Granted, Weighted-average grant-date fair value $ 12.71    
[1]
(1) 
The RSUs granted during the year ended December 31, 2019 included 0.1 one year RSUs to non-employee directors under the 1991 Plan. These RSUs had a weighted-average, grant-date fair value of $12.71