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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. 15, 2020 | Jul. 29, 2020 | Jul. 01, 2020 | Jun. 15, 2020 | Apr. 29, 2020 | Apr. 01, 2020 | Mar. 31, 2020 | Feb. 12, 2020 | Jan. 02, 2020 | Sep. 30, 2019 | Jun. 28, 2019 | Mar. 29, 2019 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Feb. 29, 2020 | Dec. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jul. 30, 2020
Common Stock, Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 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) |  |  |  |  |  |  |  |  |  |  |  |  | $ 185.31 |  |  |  | $ 148.61 | $ 185.31 |  | $ 185.31 |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  | $ 0.27 |  |  | $ 0.27 |  |  | $ 0.27 |  | $ 0.25 | $ 0.25 | $ 0.25 |  |  |  |  |  |  |  |  |  |
Payments of Dividends, Total | $ 43.9 |  |  | $ 44.0 |  |  | $ 43.9 |  |  | $ 40.8 | $ 41.0 | $ 40.9 |  |  |  |  |  | $ 43.9 | $ 40.8 | $ 131.8 | $ 122.7 |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,076,565 |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50.0 | $ 75.0 | $ 298.8 | $ 200.0 |
Treasury Stock, Shares, Ending Balance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 381,251,589 |  |  |  | 380,841,474 | 381,251,589 |  | 381,251,589 |  |
Common Stock Reissued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,482,072 |  |
Common Stock, Weighted Average Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.61 |  |  |  |  | $ 10.61 |  | $ 10.61 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,741 | 870,606 | 675,324 | 606,100 |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.0) | $ (0.0) | $ (0.0) | $ (0.0) |
May 2010 Share Repurchase Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,800.0
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 |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,471.2 |  |  |  |  | 3,471.2 |  | 3,471.2 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  |  |  |  |  |  |  |  | 328.8 |  |  |  |  | $ 328.8 |  | $ 328.8 |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,892,187 |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 298.8 |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 157.90 |  |
December 2019 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50.0 |  |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  |  |  |  | 267,845 |  |  |  |  |  |  | 40,901 |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share) |  |  |  |  |  |  |  |  | $ 149.34 |  |  |  |  |  |  |  |  |  |  |  |  |
March 2020 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75.0 |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  | 235,018 |  |  | 430,477 |  |  |  |  |  |  |  | 61,052 |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share) |  |  |  |  |  | $ 139.38 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
June 2020 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  | $ 50.0 | $ 50.0 |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 41,272 |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share) |  |  | $ 170.20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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