Equity and Capital - Equity Distribution Agreement (Details) - 2020 Equity distribution agreement - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Class of Stock [Line Items]
Common stock issued in public offering (shares)	0	0
Amount of shares reserved for future issuance	$ 749.4
Maximum
Class of Stock [Line Items]
Aggregate offering price of the distribution agreement maximum	$ 1,000.0