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Shareholders' Equity (Details) - USD ($)				3 Months Ended
	Mar. 31, 2021	Mar. 15, 2021	Jun. 05, 2020	Mar. 31, 2021	Mar. 31, 2020	Feb. 05, 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
Dividends per common share (in dollars per share)				$ 0.36	$ 0.35
Dividends paid per common share (in dollars per share)	$ 0.36
Dividends declared and paid, preference shares				$ 7,289,000	$ 9,056,000
Dividends declared and paid, common shares				$ 17,800,000	$ 15,400,000
Common Shares
Class of Stock [Line Items]
Proceeds from issuance			$ 1,100,000,000
Dividends per common share (in dollars per share)		$ 0.36
Share repurchase program, authorized amount						$ 500,000,000.0
Share repurchase program, shares repurchased (in shares)				1,076,344
Repurchase of shares				$ (171,600,000)
Share repurchase program, price per share (in dollars per share)				$ 159.47
Share repurchase program, remaining authorized aggregate amount	$ 328,400,000			$ 328,400,000
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
Liquidation preference per annum (in dollars per share)	$ 1.52			$ 1.52
Liquidation preference quarterly (in dollars per share)	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
Liquidation preference quarterly (in dollars per share)	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
Liquidation preference quarterly (in dollars per share)	359.375			359.375
Depositary Shares
Class of Stock [Line Items]
Liquidation preference per annum (in dollars per share)	1.4375			1.4375
Liquidation preference quarterly (in dollars per share)	$ 0.359375			$ 0.359375

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