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Stock Compensation Plans (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Apr. 28, 2016
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
Dec. 31, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock, shares authorized   150,000,000   150,000,000   150,000,000
Stock compensation expense | $   $ 7.9 $ 3.5 $ 19.6 $ 10.9  
2006 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock, shares authorized   10,000,000   10,000,000    
Shares available for grant, shares   2,667,694   2,667,694    
Performance Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average grant-date fair value of performance awards granted, dollars per share | $ / shares       $ 47.93 $ 45.54  
Shares awarded       1,351,350    
Share-based compensation cost not yet recognized | $   $ 51.0   $ 51.0    
Share-based compensation, recognition period of unrecognized compensation cost, years       2 years    
Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average grant-date fair value of performance awards granted, dollars per share | $ / shares   $ 45.10 $ 44.03      
Shares awarded       141,202    
Shares received for every Restricted Stock Unit Award given       1    
Share-based compensation cost not yet recognized | $   $ 7.4   $ 7.4    
Share-based compensation, recognition period of unrecognized compensation cost, years       2 years    
Requisite period       3 years    
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock issued, shares 20,232          
Restricted common stocks issued, shares 15,395          
Stock compensation expense | $       $ 1.1    
Vesting Year One [Member] | Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage       33.33%    
Vesting Year Two [Member] | Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage       33.33%    
Vesting Year Three [Member] | Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage       33.33%