Stockholders' Equity - Common Stock Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
	Dec. 31, 2020	Sep. 30, 2019	Sep. 30, 2018	Feb. 28, 2019
Equity, Class of Treasury Stock [Line Items]
Sale of shares (in shares)		4,729,045	1,944,511
Equity Shelf Program
Equity, Class of Treasury Stock [Line Items]
Aggregate amount of common stock offered to sell				$ 1,500,000,000
Remaining capacity		$ 1,333,682,000
Scenario, Forecast | Equity Shelf Program
Equity, Class of Treasury Stock [Line Items]
Sale of shares (in shares)	5,152,658