Equity - Common Stock Continuous Offering Program (Details) - USD ($) $ / shares in Units, shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Issuance of Common Stock, net	$ 478,572,000	$ 1,014,215,000
Common Stock [Member]
Class of Stock [Line Items]
Distribution agreement initial capacity gross sales price (up to)	$ 750,000,000.0
Common Stock Continuous Offering Program [Member] | Common Stock [Member]
Class of Stock [Line Items]
Issuance of Common Stock, net (shares)	13,300	1,810
Issuance of Common Stock, net	$ 484,100,000	$ 86,700,000
Proceeds from issuance of common stock	478,700,000	$ 85,400,000
Offering cost	$ 100,000
Number of shares available (shares)	572,200
Common Stock Continuous Offering Program [Member] | Common Stock [Member] | Weighted Average [Member]
Class of Stock [Line Items]
Share price (in dollars per share)	$ 36.41	$ 48.00
Share price net of offering costs (in dollars per share)	$ 36.00	$ 47.28