XML 103 R88.htm IDEA: XBRL DOCUMENT v3.20.4
Stock-Based Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 26, 2012
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total authorized shares for plan issuance   2,000,000.0    
Shares available for issuance   116,031    
Fair value of shares vested   $ 5.1 $ 7.9 $ 4.8
Intrinsic value of restricted stock units exercised   $ 7.6 $ 36.9 $ 0.5
Weighted average recognition period   2 years 2 months 12 days    
Restricted stock outstanding excluded from calculation of diluted net income per share   0 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   622,000    
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price   $ 333.94    
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average fair value of shares granted     $ 441.54 $ 317.87
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average fair value of shares granted   $ 436.89 $ 453.64 $ 363.11
Restricted stock units converted to common stock, shares   21,971    
Fifteen Year Vesting [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   15 years    
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    
Four Year Vesting [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   4 years    
Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of additional shares authorized for issuance 500,000