Equity - Distributions (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Dividends Payable
Total distributions paid (usd per share)	$ 4.1640	$ 4.1320	$ 4.0700
Ordinary income
Dividends Payable
Total distributions paid (usd per share)	3.3112	3.1939	3.5122
Capital gains
Dividends Payable
Total distributions paid (usd per share)	0.8528	0.0187	0.5578
Return of capital
Dividends Payable
Total distributions paid (usd per share)	$ 0	$ 0.9194	$ 0