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Note 12 - Equity Compensation Plans - Summary of Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 9 Months Ended
Jan. 15, 2020
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Outstanding beginning balance, options (in shares)   6,432,814    
Outstanding beginning balance, options, weighted average exercise price (in dollars per share)   $ 79.51    
Outstanding, options, aggregate intrinsic value     $ 527.2 $ 449.2
Granted, options (in shares) 882,749 924,810    
Granted, options, weighted average exercise price (in dollars per share)   $ 158.94    
Dividend reinvestment, options (in shares)   0    
Dividend reinvestment, options, weighted average exercise price (in dollars per share)   $ 0    
Exercised or lapsed, options (in shares)   (1,308,469)    
Exercised or lapsed, options, weighted average exercise price (in dollars per share)   $ 54.86    
Exercised or lapsed   $ 148.4    
Canceled, expired or forfeited, options (in shares)   (114,597)    
Canceled, expired or forfeited, options, weighted average exercise price (in dollars per share)   $ 123.00    
Outstanding ending balance, options (in shares)   5,934,558    
Outstanding ending balance, options, weighted average exercise price (in dollars per share)   $ 96.48    
Exercisable, options (in shares)     3,799,648 4,175,855
Exercisable, options, weighted average exercise price (in dollars per share)     $ 75.69 $ 65.05
Exercisable, options, aggregate intrinsic value     $ 416.5 $ 352.0
Nonvested, options (in shares)     2,134,910  
Expected to vest, options (in shares)     1,880,444  
Restricted Stock [Member]        
Outstanding beginning balance, number of shares (in shares)   428,729    
Outstanding beginning balance, weighted average exercise price (in dollars per share)   $ 107.96    
Granted, number of shares (in shares) 148,658 159,328    
Granted, weighted average exercise price (in dollars per share)   $ 159.30    
Dividend reinvestment, number of shares (in shares)   0    
Dividend reinvestment, weighted average exercise price (in dollars per share)   $ 0    
Exercised or lapsed, number of shares (in shares)   (169,101)    
Exercised or lapsed, weighted average exercise price (in dollars per share)   $ 99.91    
Canceled, expired or forfeited, number of shares (in shares)   (20,341)    
Canceled, expired or forfeited, weighted average exercise price (in dollars per share)   $ 121.60    
Outstanding ending balance, number of shares (in shares)   398,615    
Outstanding ending balance, weighted average exercise price (in dollars per share)   $ 130.77    
Nonvested, number of shares (in shares)   398,615 398,615 428,729
Expected, number of shares (in shares)     351,554  
Performance Shares [Member]        
Outstanding beginning balance, number of shares (in shares)   93,960    
Outstanding beginning balance, weighted average exercise price (in dollars per share)   $ 158.50    
Granted, number of shares (in shares) 50,736 50,736    
Granted, weighted average exercise price (in dollars per share)   $ 192.93    
Dividend reinvestment, number of shares (in shares)   713    
Exercised or lapsed, number of shares (in shares)   0    
Canceled, expired or forfeited, number of shares (in shares)   0    
Outstanding ending balance, number of shares (in shares)   145,409    
Outstanding ending balance, weighted average exercise price (in dollars per share)   $ 170.75    
Nonvested, number of shares (in shares)   145,409 145,409 93,960
Expected, number of shares (in shares) [1]     269,001  
[1] Includes estimated performance achievement