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Issuances of Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of common stock issuances pursuant to ATM program | The following table outlines common stock issuances pursuant to our ATM program (dollars in millions):
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Shares of common stock issued under the ATM program | 17,724,374 |  | 17,051,456 |  | 19,138,610 |
Gross proceeds | $ | 1,094.9 |  |  | $ | 1,274.5 |  |  | $ | 1,125.4 |
Schedule of common stock issuances pursuant to DRSPP program | The following table outlines common stock issuances pursuant to our DRSPP program (dollars in millions):
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Shares of common stock issued under the DRSPP program | 149,289 |  | 117,522 |  | 116,268 |
Gross proceeds | $ | 9.1 |  |  | $ | 8.4 |  |  | $ | 9.1 |

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