Issuances of Common Stock (Tables)

12 Months Ended

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