Subsequent Events - Dividends Declared (Details) - $ / shares		3 Months Ended						9 Months Ended
	Nov. 03, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Subsequent Events
Cash dividends declared per share (in dollars per share)		$ 0.16	$ 0.16	$ 0.16	$ 0.15	$ 0.15	$ 0.15	$ 0.48	$ 0.45
Class A Common Stock | Subsequent Event
Subsequent Events
Cash dividends declared per share (in dollars per share)	$ 0.185
Preferred Stock, Series A | Subsequent Event
Subsequent Events
Cash dividends declared per share (in dollars per share)	0.384375
Preferred Stock, Series B | Subsequent Event
Subsequent Events
Cash dividends declared per share (in dollars per share)	11.625
Series C Preferred Stock | Subsequent Event
Subsequent Events
Cash dividends declared per share (in dollars per share)	$ 7.104167