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Equity, Stock Repurchase (Details) - USD ($) shares in Millions, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 23 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 24, 2018 | Jan. 24, 2017 | Jan. 31, 2020 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018
Shareholders' Equity |  |  |  |  |  |  |  |  |
Treasury stock retired (in dollars) |  |  |  |  |  | $ 0.0 | $ 0.0 | $ 0.0 |
Treasury stock, shares |  |  |  |  | 0.7 | 0.8 | 0.7 |  | 0.7
Payments for shares repurchased and retained in treasury |  |  |  |  |  | $ 601.7 | $ 935.2 | $ 618.0 |
2018 Stock Repurchase Program and 2017 Stock Repurchase Program |  |  |  |  |  |  |  |  |
Shareholders' Equity |  |  |  |  |  |  |  |  |
Number of shares repurchased |  |  |  |  |  |  | 10.6 |  |
Payments for shares repurchased (in dollars) |  |  |  |  |  |  | $ 935.2 |  |
2018 Stock Repurchase Program |  |  |  |  |  |  |  |  |
Shareholders' Equity |  |  |  |  |  |  |  |  |
Value of shares authorized to be repurchased (in dollars) | $ 2,000.0 |  |  |  |  |  |  |  |
Repurchase of stock program, period | 3 years |  |  |  |  |  |  |  |
Number of shares repurchased |  |  |  |  | 6.4 | 6.5 | 6.4 |  |
Payments for shares repurchased (in dollars) |  |  |  |  | $ 553.2 | $ 601.7 | $ 553.2 |  |
Number of shares repurchased and retained in treasury |  |  |  |  |  | 1.0 | 0.7 |  |
Payments for shares repurchased and retained in treasury |  |  |  |  |  | $ 87.6 | $ 55.0 |  |
Number of shares repurchased and retired |  |  |  |  |  | 5.5 | 5.7 |  |
Payments for shares repurchased and retired (in dollars) |  |  |  |  |  | $ 514.1 | $ 498.2 |  |
2017 Stock Repurchase Program |  |  |  |  |  |  |  |  |
Shareholders' Equity |  |  |  |  |  |  |  |  |
Value of shares authorized to be repurchased (in dollars) |  | $ 1,000.0 |  |  |  |  |  |  |
Repurchase of stock program, period |  | 2 years |  |  |  |  |  |  |
Number of shares repurchased and retired |  |  |  | 4.2 |  |  |  | 8.4 | 12.6
Payments for shares repurchased and retired (in dollars) |  |  |  | $ 382.0 |  |  |  | $ 618.0 | $ 1,000.0
Subsequent Event | 2018 Stock Repurchase Program |  |  |  |  |  |  |  |  |
Shareholders' Equity |  |  |  |  |  |  |  |  |
Number of shares repurchased and retained in treasury |  |  | 0.3 |  |  |  |  |  |
Payments for shares repurchased and retained in treasury |  |  | $ 29.0 |  |  |  |  |  |
Value of shares remaining that may be repurchased under the stock repurchase program (in dollars) |  |  | $ 816.1 |  |  |  |  |  |

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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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