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Issuances of Common Stock (Tables)
 6 Months Ended
Jun. 30, 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):
Three months ended June 30,Six months ended June 30,
2021202020212020
Shares of common stock issued under the ATM program6,589,5981,511,1496,589,5981,511,149
Gross proceeds$454.8 $95.7 $454.8 $95.7 
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):
Three months ended June 30,Six months ended June 30,
2021202020212020
Shares of common stock issued under the DRSPP program39,42344,81782,81778,817
Gross proceeds$2.7 $2.4 $5.3 $4.8