Other Equity Matters - Preferred Share (Details) - USD ($) $ in Thousands	Aug. 30, 2021	Nov. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2021	Aug. 31, 2021	Jan. 31, 2020
Class of Stock [Line Items]
Preferred Stock, Liquidation Preference, Value					$ 730,000
Preferred Stock, Liquidation Preference (in shares)					29,200,000
8.50% Series A Cumulative Redeemable Perpetual Preference Shares
Class of Stock [Line Items]
Preferred Stock, Liquidation Preference, Value				$ 86,250
Preferred Stock, Liquidation Preference (in shares)				3,450,000
Preferred stock, dividend rate, percentage				8.50%
8.00% Series B Cumulative Redeemable Perpetual Preference Shares
Class of Stock [Line Items]
Preferred Stock, Liquidation Preference, Value			$ 143,750
Preferred Stock, Liquidation Preference (in shares)			5,750,000
Preferred stock, dividend rate, percentage			8.00%
7.375% Series C Cumulative Redeemable Perpetual Preference Shares
Class of Stock [Line Items]
Preferred Stock, Liquidation Preference, Value		$ 175,000
Preferred Stock, Liquidation Preference (in shares)		7,000,000
Preferred stock, dividend rate, percentage		7.375%
6.875% Series D Cumulative Redeemable Perpetual Preference Shares
Class of Stock [Line Items]
Preferred Stock, Liquidation Preference, Value							$ 150,000
Preferred Stock, Liquidation Preference (in shares)							6,000,000
5.75% Series E Cumulative Redeemable Perpetual Preference Shares
Class of Stock [Line Items]
Preferred Stock, Liquidation Preference, Value						$ 175,000
Preferred Stock, Liquidation Preference (in shares)						7,000,000
Preferred stock, dividend rate, percentage	5.75%