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Issuances of Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2021
ATM Program |
Class of Stock [Line Items] |
Schedule of common stock issuances | The following table outlines common stock issuances pursuant to our ATM program (dollars in millions):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Shares of common stock issued under the ATM program | 46,290,540 |  | 17,724,374 |  | 17,051,456 |
Gross proceeds | $ | 3,207.9 |  |  | $ | 1,094.9 |  |  | $ | 1,274.5 |
DRSPP |
Class of Stock [Line Items] |
Schedule of common stock issuances | The following table outlines common stock issuances pursuant to our DRSPP program (dollars in millions):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Shares of common stock issued under the DRSPP program | 168,000 |  | 149,289 |  | 117,522 |
Gross proceeds | $ | 11.2 |  |  | $ | 9.1 |  |  | $ | 8.4 |

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