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Stock-Based Compensation Plans (Narrative) (Details)
$ / shares in Units, shares in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
years
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Mar. 31, 2015
USD ($)
$ / shares
shares
Stock options, common shares to be issued upon exercise 0.4 0.5  
Options approved, weighted average exercise price | $ / shares $ 13.31 $ 13.33  
Stock option expense | $ $ 4,100,000   $ 4,100,000
Options granted, weighted-average grant date fair value | $ / shares $ 3.77 $ 3.78  
Awards Classified as Liabilities [Domain]      
Stock option expense | $ $ 300,000   $ 500,000
Time-Based Restricted Stock [Member]      
Restricted stock units, common shares to be issed upon exercise 1.4 1.3  
Granted, shares 0.5   0.7
Restricted stock units granted, weighted average fair value at date of grant | $ / shares $ 26.34   $ 22.10
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 22.84 $ 20.20  
Total unrecognized compensation cost related to non-vested restricted stock and restricted stock units | $ $ 26,600,000    
Weighted average recognition period (in years) | years 1.3    
Performance Shares [Member]      
Restricted stock units, common shares to be issed upon exercise 0.3 0.3  
Granted, shares 0.3    
Restricted stock units granted, weighted average fair value at date of grant | $ / shares $ 26.49    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 26.45 $ 21.84  
Performance Shares [Member] | Maximum [Member]      
Payout range 200.00%    
Performance Shares [Member] | Minimum [Member]      
Payout range 50.00%    
2013 Performance grants [Domain] | Performance Shares [Member]      
Total unrecognized compensation cost related to non-vested restricted stock and restricted stock units | $ $ 5.9    
Key terms not yet established [Member] | Performance Shares [Member]      
Granted, shares 0.3    
Various Dates [Domain] | Performance Shares [Member]      
Granted, shares     0.4