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Stock-Based Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 26, 2012
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for issuance   235,663    
Fair value of shares vested   $ 4.4 $ 2.6 $ 1.9
Intrinsic value of restricted stock units exercised   $ 78.7 $ 0.2 40.1
Intrinsic value of stock options exercised       $ 5.1
Weighted average recognition period   32 months    
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average fair value of shares granted   $ 196.96 $ 183.30 $ 138.14
Awards granted   7,657    
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average fair value of shares granted   $ 181.04 $ 139.00 $ 130.16
Restricted stock units converted to common stock, shares   404,096    
Ten Year Vesting [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   10 years    
Five Year Vesting [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   5 years    
Three Year Vesting [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Minimum [Member] | Fifteen Year Vesting [Member] | Restricted Stock [Member] | Chief Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   15 years    
Minimum [Member] | Three Year Vesting [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total authorized shares for plan issuance   2,000,000    
Number of additional shares authorized for issuance 500,000      
Director Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total authorized shares for plan issuance       200,000
Number of options outstanding   0