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Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Schedule of stockholders equity | A summary of shares repurchased under our securities repurchase program, and shares acquired, is as follows:
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Shares repurchased (1) | 3,112,404 |  |  | 890,195 |  |  | 3,871,887 |
Aggregate purchase price | $ | 280.6 |  |  | $ | 29.4 |  |  | $ | 169.2 |
Average purchase price per share | $ | 90.13 |  |  | $ | 33.06 |  |  | $ | 43.71 |
Shares acquired (2) | 149,176 |  |  | 137,541 |  |  | 114,949 |
Aggregate purchase price | $ | 12.9 |  |  | $ | 5.0 |  |  | $ | 4.9 |
Average purchase price per share | $ | 86.78 |  |  | $ | 36.34 |  |  | $ | 42.72 |
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(1) | Shares were repurchased under our securities repurchase program. We had $230.4 million in repurchase authorization remaining under the repurchase program as of December 31, 2021.
(2) | Shares were acquired from employees in connection with a net share settlement feature of employee equity awards.

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 + Details
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