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Share-Based Compensation Plans (Narrative) (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2012
$ / shares
shares
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $ $ 4,800,000      
Weighted-average grant-date fair value per share | $ / shares $ 1.54 $ 1.37    
Unrecognized compensation costs, recognized over a weighted average period 2 years      
Compensation cost for share-based payments | $ $ 24,200,000 $ 24,000,000 $ 51,200,000  
Stock Options [Member]        
Vesting period, years 3 years      
Contractual term, years 10 years      
Restricted Stock Units [Member]        
Vesting period, years 3 years      
Fair value vested during period | $ $ 15,200,000      
Granted, restricted stock and units 2,813,000      
Granted, weighted-average grant-date fair value | $ / shares $ 4.05      
Vested, restricted stock and units 2,387,000      
Nonvested, ending balance, restricted stock and units 4,804,000 5,356,000    
Forfeited, weighted average grant-date fair value | $ / shares $ 5.36      
Performance Restricted Stock Units [Member]        
Vesting period, years 3 years      
Granted, restricted stock and units 1,869,000      
Granted, weighted-average grant-date fair value | $ / shares $ 4.21      
Vested, restricted stock and units 1,478,000      
Nonvested, ending balance, restricted stock and units [1] 4,356,000 4,922,000    
Forfeited, weighted average grant-date fair value | $ / shares $ 6.68      
Restricted Stock Units and Performance Restricted Stock Units [Member]        
Unrecognized compensation cost | $ $ 14,000,000      
Unrecognized compensation costs, recognized over a weighted average period 1 year 9 months 18 days      
Restricted Stock Units - Treasury Stock [Member]        
Unrecognized compensation cost | $ $ 0      
Vested, restricted stock and units 366,397      
Nonvested, ending balance, restricted stock and units [1] 0      
Compensation cost for share-based payments | $ $ 800,000 $ 1,700,000 $ 2,700,000  
2017 [Member] | Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award During 2017 and 2016, we granted premium-priced stock options, in which the exercise price was equal to a 25% premium and 30% premium, respectively, from the closing market price of our stock price at the date of grant. The premium-priced stock options vest on a three-year graded vesting schedule. The fair value of each premium-priced stock option is estimated on the date of grant using a Monte-Carlo simulation.      
2017 [Member] | Performance Restricted Stock Units [Member]        
Vesting period, years 3 years      
Performance period 3 years      
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award During 2017 and 2016, we granted performance restricted stock units that would vest and settle after three years based on the relative total shareholder return of our common stock against companies included in the S&P 400 index as of the date of grant over a three year performance period ("2017 PRSUs" and "2016 PRSUs", respectively).      
Forfeited, weighted average grant-date fair value | $ / shares $ 4.52      
2016 [Member] | Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award During 2017 and 2016, we granted performance restricted stock units that would vest and settle after three years based on the relative total shareholder return of our common stock against companies included in the S&P 400 index as of the date of grant over a three year performance period ("2017 PRSUs" and "2016 PRSUs", respectively).      
2016 [Member] | Performance Restricted Stock Units [Member]        
Vesting period, years 3 years      
Performance period 3 years      
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award During 2017 and 2016, we granted performance restricted stock units that would vest and settle after three years based on the relative total shareholder return of our common stock against companies included in the S&P 400 index as of the date of grant over a three year performance period ("2017 PRSUs" and "2016 PRSUs", respectively).      
Forfeited, weighted average grant-date fair value | $ / shares   $ 4.42    
Late 2015 [Member] | Performance Restricted Stock Units [Member]        
Granted, restricted stock and units     1,123,183  
Compensation cost for share-based payments | $ $ 2,000,000 $ 1,600,000    
2012 [Member] | Restricted Stock Units - Treasury Stock [Member]        
Vesting period, years       5 years
Granted, restricted stock and units       200,000
Granted, weighted-average grant-date fair value | $ / shares       $ 21.69
2015 [Member] | Performance Restricted Stock Units [Member]        
Vesting period, years 3 years      
Performance period 2 years      
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award During 2015, we granted performance restricted stock units that would vest and settle after three years only upon the satisfaction of certain performance conditions over two years ("2015 PRSUs"). In addition, if the performance conditions are achieved above target, these performance restricted stock units are subject to a market condition in which the number of performance restricted stock units that vest will be limited to the target amount if the Company’s absolute total shareholder return during the three-year service period is negative.      
Forfeited, weighted average grant-date fair value | $ / shares     $ 7.49  
2015 [Member] | Restricted Stock Units - Treasury Stock [Member]        
Vesting period, years     3 years  
Granted, restricted stock and units     489,596  
Granted, weighted-average grant-date fair value | $ / shares     $ 9.00  
2015 [Member] | Performance Restricted Stock Units - Treasury Stock [Member]        
Granted, restricted stock and units     121,951  
Granted, weighted-average grant-date fair value | $ / shares     $ 7.49  
Nonvested, ending balance, restricted stock and units [1] 101,625      
Compensation cost for share-based payments | $ $ 100,000 $ 100,000 $ 200,000  
Director [Member] | Restricted Stock Units [Member]        
Vesting period, years 1 year      
Two Thousand And Thirteen Plan [Member]        
Multiplier for grant award 3.13      
Maximum award, number of shares 55,000,000      
Two Thousand And Sixteen Plan [Member]        
Multiplier for grant award 2.4      
Maximum award, number of shares 48,000,000      
2010 Plan [Member] | SARs [Member]        
Vesting period, years 3 years      
2013 Plan [Member] | Restricted Stock Units [Member]        
Vesting period, years 3 years      
Performance period 3 years      
2013 Plan [Member] | Performance Restricted Stock Units [Member]        
Vesting period, years 3 years      
Performance period 3 years      
[1] Based on initial target payout.