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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2020
Equity [Abstract] |
Schedule of Shares Repurchased | The table below summarizes the shares of our Common Stock we repurchased during 2020 under the program and the cost of the shares received, which were recorded as Treasury Stock.
|  | Three Months Ended September 30, 2020 |  | Nine Months Ended September 30, 2020
Number of shares repurchased |  | 179,824 |  |  | 898,991 |
Total cost of shares received |  | $ | 100.4 |  |  | $ | 373.3 |
The table below summarizes the shares of our Common Stock Sanofi elected to sell, and we elected to purchase, to satisfy Sanofi's funding obligations and the cost of the shares received, which were recorded as Treasury Stock.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Libtayo: |  |  |  |  |  |  |
Number of shares purchased (by issuing a credit towards the amount owed by Sanofi) | — |  |  | 103,761 |  |  | 77,677 |  |  | 210,733 |
Total cost of shares received | — |  |  | $ | 29.2 |  |  | $ | 41.7 |  |  | $ | 73.3 |
Dupilumab/Itepekimab: |  |  |  |  |  |  |
Number of shares purchased (in cash) | — |  |  | 69,143 |  |  | 171,471 |  |  | 93,286 |
Total cost of shares received | — |  |  | $ | 19.4 |  |  | $ | 93.3 |  |  | $ | 29.4 |

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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 + Details
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