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Note 11 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 03, 2022
Sep. 01, 2022
Jul. 27, 2022
Jul. 01, 2022
Apr. 27, 2022
Apr. 01, 2022
Feb. 16, 2022
Jan. 04, 2022
Sep. 30, 2022
May 31, 2022
Feb. 28, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Common Stock, Shares Authorized (in shares)                 2,000,000,000     2,000,000,000   2,000,000,000       2,000,000,000
Share Price (in dollars per share)                 $ 170.53     $ 170.53   $ 170.53       $ 227.90
Preferred Stock, Shares Authorized (in shares)                 80,000,000     80,000,000   80,000,000        
Preferred Stock, Par or Stated Value Per Share (in dollars per share)                 $ 0.001     $ 0.001   $ 0.001        
Preferred Stock, Shares Issued (in shares)                 0     0   0       0
Common Stock, Dividends, Per Share, Declared (in dollars per share)     $ 0.31   $ 0.31   $ 0.31                      
Payments of Ordinary Dividends, Common Stock                           $ 147.2 $ 141.0      
Treasury Stock, Shares, Acquired (in shares)                       1,603,586 798,242 6,217,296 2,192,780      
Treasury Stock, Value, Acquired, Cost Method                       $ 300.0 $ 150.0 $ 1,196.3 $ 400.0      
Treasury Stock, Shares, Total (in shares)                 387,161,020     387,161,020   387,161,020       382,351,399
Stock Issued During Period, Shares, Treasury Stock Reissued (in shares)                           1,407,675        
Shares Issued, Price Per Share (in dollars per share)                 $ 14.07     $ 14.07   $ 14.07        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)                       1,321,733 740,090 1,365,720 824,067      
Additional ASR Agreement With Citibank, N.A. [Member]                                    
Stock Repurchase Program, Authorized Amount                               $ 300.0 $ 325.0 $ 100.0
Treasury Stock, Shares, Acquired (in shares)   217,024   1,386,562   1,211,387   360,913   349,762 141,766     3,667,414        
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)                 $ 187.08 $ 208.18 $ 198.93              
Accelerated Share Repurcahse ("ASR") Agreement with Morgan Stanley [Member]                                    
Treasury Stock, Shares, Acquired (in shares)                           6,217,296        
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)                           $ 192.42        
Treasury Stock, Value, Acquired, Cost Method                           $ 1,196.3        
Stock Repurchase Program, Remaining Authorized Repurchase Amount                 $ 407.5     $ 407.5   407.5        
February 16, 2022 Share Repurchase Program [Member]                                    
Stock Repurchase Program, Authorized Amount             $ 1,000.0                      
Additional ASR Agreement With HSBC Bank USA, N.A. [Member]                                    
Stock Repurchase Program, Authorized Amount                 $ 100.0     $ 100.0   $ 100.0        
Additional ASR Agreement With HSBC Bank USA, N.A. [Member] | Subsequent Event [Member]                                    
Treasury Stock, Shares, Acquired (in shares) 469,126                                  
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) $ 170.53                                  
Treasury Stock, Value, Acquired, Cost Method $ 80.0