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Shareholders' Equity (Details) - USD ($)						3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 15, 2021	Mar. 31, 2021	Mar. 15, 2021	Jun. 05, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	May 07, 2021	Dec. 31, 2020	Mar. 26, 2020
Class of Stock [Line Items]
Preference shares, shares outstanding (in shares)	11,010,000					11,010,000		11,010,000			11,010,000
Dividends per common share (in dollars per share)						$ 0.36	$ 0.35	$ 0.72	$ 0.70
Dividends paid per common share (in dollars per share)	$ 0.36		$ 0.36
Dividends declared and paid, preference shares						$ 7,289,000	$ 7,289,000	$ 14,578,000	$ 16,345,000
Dividends declared and paid, common shares								$ 35,000,000.0	$ 33,100,000
Common Shares
Class of Stock [Line Items]
Proceeds from issuance					$ 1,100,000,000
Dividends per common share (in dollars per share)		$ 0.36		$ 0.36
Share repurchase program, authorized amount										$ 500,000,000.0
Share repurchase program, shares repurchased (in shares)								3,019,603
Repurchase of shares								$ (480,700,000)
Share repurchase program, price per share (in dollars per share)								$ 159.18
Share repurchase program, remaining authorized aggregate amount	$ 300,500,000					$ 300,500,000		$ 300,500,000
Common Shares | Underwritten Follow-On Offering
Class of Stock [Line Items]
Shares issued (in shares)					6,325,000
Price of shares issued (in dollars per share)					$ 166.00
Common Shares | Private Placement
Class of Stock [Line Items]
Shares issued (in shares)					451,807
Proceeds from issuance					$ 75,000,000.0
Series C Preference Shares
Class of Stock [Line Items]
Dividend rate, percentage								6.08%
Preference shares redemption value												$ 125,000,000.0
Preference shares, shares outstanding (in shares)	0					0		0
Liquidation preference per annum (in dollars per share)	$ 1.52					$ 1.52		$ 1.52
Liquidation preference quarterly (in dollars per share)	0.38					0.38		$ 0.38
Series E Preference Shares
Class of Stock [Line Items]
Dividend rate, percentage								5.375%
Liquidation preference per annum (in dollars per share)	1.34375					1.34375		$ 1.34375
Liquidation preference quarterly (in dollars per share)	0.3359375					0.3359375		$ 0.3359375
Series F Preference Shares
Class of Stock [Line Items]
Dividend rate, percentage								5.75%
Liquidation preference per annum (in dollars per share)	1,437.50					1,437.50		$ 1,437.50
Liquidation preference quarterly (in dollars per share)	359.375					359.375		359.375
Depositary Shares
Class of Stock [Line Items]
Liquidation preference per annum (in dollars per share)	1.4375					1.4375		1.4375
Liquidation preference quarterly (in dollars per share)	$ 0.359375					$ 0.359375		$ 0.359375

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