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Stock-Based Compensation Plans (Summary Of Stock Option Activity) (Details) - $ / shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 4 years 4 years 6 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 4 years 4 years 6 months      
Stock option activity, outstanding          
Outstanding, beginning balance, shares     0.4    
Exercisable, beginning balance, shares     0.4    
Granted, shares     0.0    
Exercised, shares     0.0    
Forfeited/cancelled, shares     0.0    
Outstanding, ending balance, shares 0.4 0.4 0.4    
Exercisable, ending balance, shares 0.4 0.4 0.4    
Granted, weighted average exercise price     $ 0.00    
Exercised, weighted average exercise price     0.00    
Forfeited/cancelled, weighted average exercise price     $ 0.00    
Outstanding, weighted average exercise price       $ 13.34 $ 13.34
Exercisable, weighted average exercise price       $ 13.34 $ 13.34
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]          
Outstanding, shares 0.4 0.4 0.4 0.4 0.4
Outstanding, weighted average exercise price       $ 13.34 $ 13.34
Exercisable, shares 0.4 0.4 0.4 0.4 0.4
Exercisable, weighted average exercise price       $ 13.34 $ 13.34
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share Based Compensation Arrangement By Share Based Payment Award, Options, Outstanding Unvested Weighted Average Fair Value Grant Date       3.80 3.78
Share Based Compensation Arrangement By Share Based Payment Award, Options, Exercisable Weighted Average Fair Value       $ 3.80 $ 3.78