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Stock Compensation Plans (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Apr. 27, 2017
shares
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
Dec. 31, 2016
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 | $   $ 10.8 $ 6.2 $ 22.8 $ 11.7  
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   3,114,233   3,114,233    
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       $ 61.83 $ 47.94  
Shares awarded       531,596    
Share-based compensation cost not yet recognized | $   $ 48.1   $ 48.1    
Share-based compensation, recognition period of unrecognized compensation cost, years       2 years    
Waived stock award [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award accelerated compensation cost | $   $ 4.8        
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   $ 61.83 $ 45.05      
Shares awarded       108,588    
Share-based compensation cost not yet recognized | $   $ 9.8   $ 9.8    
Share-based compensation, recognition period of unrecognized compensation cost, years       2 years    
Shares received for every restricted stock unit award given       1    
Requisite period       3 years    
Stock Appreciation Rights (SARs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation cost not yet recognized | $   $ 5.8   $ 5.8    
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock issued, shares 14,968          
Restricted common stocks issued, shares 12,066          
Stock compensation expense | $       $ 1.0    
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%