Shareholders' Equity (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Class of Stock [Line Items]
Gross proceeds	$ 420,000,000	$ 0
Liquidation preference per share (in dollars per share)	$ 25,000
Preferred Shares
Class of Stock [Line Items]
Shares issued	16,800
Interest rate	6.625%
Shares issued (price per share)	$ 25,000
Gross proceeds	$ 420,000,000
Depositary shares	16,800,000
Net cash proceeds	406,000,000
Issuance costs	14,000,000
Liquidation preference per share (in dollars per share)	$ 25,000
Redemption price per Preferred Share	$ 25,000
Common Shares issued upon conversion	2,773.200
Redemption price after credit rating downgrade | Preferred Shares
Class of Stock [Line Items]
Redemption price per Preferred Share	$ 25,500