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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 |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2021 | Jul. 28, 2021 | Jul. 01, 2021 | Apr. 28, 2021 | Apr. 01, 2021 | Feb. 17, 2021 | Jan. 04, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | May 31, 2021 | Mar. 31, 2021 | Feb. 28, 2021 | Dec. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Aug. 17, 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) |  |  |  |  |  |  |  | $ 200.27 |  |  |  |  | $ 207.59 | $ 200.27 |  | $ 200.27 |  |
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 |  | 0 |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  | $ 0.29 |  | $ 0.29 |  | $ 0.29 |  |  |  |  |  |  |  |  |  |  |  |
Payments of Dividends, Total |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 46.8 | $ 43.9 | $ 141.0 | $ 131.8 |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,749,644 |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150.0 | $ 50.0 | $ 400.0 | $ 298.8 |
Treasury Stock, Shares, Ending Balance (in shares) |  |  |  |  |  |  |  | 382,587,968 |  |  |  |  | 381,185,512 | 382,587,968 |  | 382,587,968 |  |
Common Stock Reissued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 790,324 |  |
Common Stock, Weighted Average Price (in dollars per share) |  |  |  |  |  |  |  | $ 11.54 |  |  |  |  |  | $ 11.54 |  | $ 11.54 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 740,090 | 40,741 | 824,067 | 675,324 |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.0) | $ (0.0) | $ (0.0) | $ (0.0) |
Share Repurchase Programs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  | $ 4,600.0 |  |  |  |  |  | 4,600.0 |  | 4,600.0 |  |
Treasury Stock, Cumulative Value Acquired, Cost Method |  |  |  |  |  |  |  | 3,921.2 |  |  |  |  |  | 3,921.2 |  | 3,921.2 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  |  |  | 678.8 |  |  |  |  |  | $ 678.8 |  | $ 678.8 |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,192,780 |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400.0 |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 182.41 |  |
August 2021 Share Repurchase Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500.0
December 2020 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  | $ 50.0 |  |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  |  | 192,687 |  |  |  |  | 70,787 |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share) |  |  |  |  |  |  | $ 207.59 |  |  |  |  |  |  |  |  |  |  |
March 2021 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Purchase Price |  |  |  |  |  |  |  |  |  |  | $ 125.0 |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  | 565,963 |  |  |  |  | 121,965 |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share) |  |  |  |  | $ 176.69 |  |  |  |  |  |  |  |  |  |  |  |  |
June 2021 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Purchase Price |  |  |  |  |  |  |  | $ 75.0 | $ 150.0 |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) | 111,429 |  | 686,813 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share) |  |  | $ 174.72 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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