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Share-Based Compensation (Additional Information On Stock Options Outstanding) (Details)
shares in Millions
 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Less than $12.76 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Prices, Less than $9.80 $ 12.76
Number of Shares, Exercisable (in shares) | shares 3.3
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 7.75
Number of Shares, Unexercisable (in shares) | shares 0.0
Weighted Average Exercise Price, Unexercisable (in dollars per share) $ 0.00
Number of Shares, Total (in shares) | shares 3.3
Weighted Average Exercise Price, Total (in dollars per share) $ 7.75
Above $12.76 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Prices, Less than $9.80 12.76
Exercise Prices, Above $9.80 $ 12.76
Number of Shares, Exercisable (in shares) | shares 0.0
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 0.00
Number of Shares, Unexercisable (in shares) | shares 0.0
Weighted Average Exercise Price, Unexercisable (in dollars per share) $ 0.00
Number of Shares, Total (in shares) | shares 0.0
Weighted Average Exercise Price, Total (in dollars per share) $ 0.00
Total outstanding [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Shares, Exercisable (in shares) | shares 3.3
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 7.75
Number of Shares, Unexercisable (in shares) | shares 0.0
Weighted Average Exercise Price, Unexercisable (in dollars per share) $ 0.00
Number of Shares, Total (in shares) | shares 3.3
Weighted Average Exercise Price, Total (in dollars per share) $ 7.75