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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, 2021
Sep. 30, 2021
Dec. 31, 2020
Outstanding beginning balance, options (in shares)   5,611,777  
Outstanding beginning balance, options, weighted average exercise price (in dollars per share)   $ 98.28  
Outstanding, options, aggregate intrinsic value   $ 505.0 $ 613.4
Granted, options (in shares) 706,507 748,936  
Granted, options, weighted average exercise price (in dollars per share)   $ 189.26  
Dividend reinvestment, options (in shares)   0  
Dividend reinvestment, options, weighted average exercise price (in (in dollars per share)   $ 0  
Exercised or lapsed, options (in shares)   (572,213)  
Exercised or lapsed, options, weighted average exercise price (in dollars per share)   $ 78.63  
Exercised or lapsed, options, aggregate intrinsic value   $ 60.4  
Canceled, expired or forfeited, option (in shares)   (129,363)  
Canceled, expired or forfeited, options, weighted average exercise price (in dollars per share)   $ 153.70  
Outstanding, option (in shares)   5,659,137  
Outstanding beginning balance, options, weighted average exercise price (in dollars per share)   $ 111.03  
Exercisable, options (in shares)   3,765,059 3,494,164
Exercisable, options, weighted average exercise price (in dollars per share)   $ 86.31 $ 76.84
Exercisable, options, aggregate intrinsic value   $ 429.1 $ 456.9
Nonvested, options (in shares)   1,894,078  
Expected to vest, options (in shares)   1,681,038  
Restricted Stock [Member]      
Outstanding beginning balance, number of shares (in shares)   390,054  
Outstanding beginning balance, weighted average exercise price (in dollars per share)   $ 131.63  
Granted, number of shares (in shares) 134,777 155,500  
Granted, weighted average exercise price (in dollars per share)   $ 188.74  
Dividend reinvestment, number of shares (in shares)   0  
Dividend reinvestment (in dollars per share)   $ 0  
Exercised or lapsed, number of shares (in shares)   (165,065)  
Exercised or lapsed, weighted average exercise price (in dollars per share)   $ 121.03  
Canceled, expired or forfeited, number of shares (in shares)   (23,890)  
Canceled, expired or forfeited, weighted average exercise price (in dollars per share)   $ 156.44  
Outstanding ending balance, number of shares (in shares)   356,599  
Outstanding ending balance, weighted average exercise price (in dollars per share)   $ 159.62  
Nonvested, number of shares (in shares)   356,599 390,054
Expected, number of shares (in shares)   319,534  
Performance Shares [Member]      
Outstanding beginning balance, number of shares (in shares)   145,609  
Outstanding beginning balance, weighted average exercise price (in dollars per share)   $ 170.75  
Granted, number of shares (in shares) 59,144 59,144  
Granted, weighted average exercise price (in dollars per share)   $ 210.07  
Dividend reinvestment, number of shares (in shares)   773  
Exercised or lapsed, number of shares (in shares)   (42,610)  
Exercised or lapsed, weighted average exercise price (in dollars per share)   $ 140.70  
Canceled, expired or forfeited, number of shares (in shares)   0  
Outstanding ending balance, number of shares (in shares)   162,916  
Outstanding ending balance, weighted average exercise price (in dollars per share)   $ 192.99  
Nonvested, number of shares (in shares)   162,916 145,609
Expected, number of shares (in shares) [1]   135,055  
[1] Includes estimated performance achievement