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Note 16 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Oct. 28, 2020 | Oct. 01, 2020 | Sep. 30, 2020 | Jul. 29, 2020 | Jul. 01, 2020 | Jun. 30, 2020 | Apr. 29, 2020 | Apr. 01, 2020 | Mar. 31, 2020 | Feb. 12, 2020 | Jan. 02, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Feb. 28, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Common Stock, Shares Authorized (in shares) | 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  | 2,000,000,000 |  |  |  |  | 2,000,000,000 | 2,000,000,000 | 2,000,000,000 |
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, Total (in shares) | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  |
Share Price (in dollars per share) | $ 207.59 |  |  |  |  |  |  |  |  |  |  |  | $ 207.59 |  |  |  |  | $ 149.34 | $ 207.59 | $ 149.34 | $ 108.28
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  | $ 0.27 |  |  | $ 0.27 |  |  | $ 0.27 |  |  | $ 0.27 |  |  |  |  |  |  |  |  |  |
Payments of Dividends, Total | $ 43.9 |  |  | $ 43.9 |  |  | $ 44.0 |  |  | $ 43.9 |  |  |  |  |  |  |  |  | $ 175.8 | $ 163.5 | $ (0.0)
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,339,462 |  |
Treasury Stock, Shares, Ending Balance (in shares) | 381,185,512 |  |  |  |  |  |  |  |  |  |  |  | 381,185,512 |  |  |  |  | 380,841,474 | 381,185,512 | 380,841,474 |
Common Stock Reissued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,811,046 | 1,369,305 | 2,973,947
Common Stock, Weighted Average Price (in dollars per share) | $ 10.67 |  |  |  |  |  |  |  |  |  |  |  | $ 10.67 |  |  |  |  | $ 9.72 | $ 10.67 | $ 9.72 | $ 8.71
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 513,137 | 674,983 | 496,446
May 2010 Share Repurchase Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ 3,800.0 |  |  |  |  |  |  |  |  |  |  |  | $ 3,800.0 |  |  |  |  |  | $ 3,800.0 |  |
February 2020 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,901 |  |  |  |
February 2020 Share Repurchase Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  | $ 500.0 |  |  |  |  |  |  |  |  |  |
Share Repurchase Programs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Cumulative Value Acquired, Cost Method | 3,521.2 |  |  |  |  |  |  |  |  |  |  |  | 3,521.2 |  |  |  |  |  | 3,521.2 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 278.8 |  |  |  |  |  |  |  |  |  |  |  | $ 278.8 |  |  |  |  |  | $ 278.8 |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,155,084 | 2,178,151 |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 161.84 | $ 137.73 |
Treasury Stock, Shares, Ending Balance (in shares) | 381,185,512 |  |  |  |  |  |  |  |  |  |  |  | 381,185,512 |  |  |  |  |  | 381,185,512 |  |
December 2019 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50.0 |  |  |
March 2020 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75.0 |  |  |  |  |
June 2020 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50.0 |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 61,052 |  |  |  |  |  |
September 2020 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50.0 |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 41,272 |  |  |  |  |  |  |
January 2, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  | 267,845 |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 149.34 |  |  |  |  |  |  |  |  |
April 1, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  |  |  |  | 430,477 |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share) |  |  |  |  |  |  |  |  | $ 139.38 |  |  |  |  |  |  |  |  |  |  |  |
July 1, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  | 235,018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share) |  |  |  |  |  | $ 170.20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
October 1, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  | 215,855 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share) |  |  | $ 185.31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 2020 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  | $ 50.0 |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 47,042 |  |  |  |  |  |  |  |

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