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Shareholders' Equity (Details) - USD ($)			1 Months Ended	3 Months Ended
	Mar. 29, 2019	Mar. 15, 2019	Jun. 30, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Nov. 10, 2017
Class of Stock [Line Items]
Dividends per common share (in dollars per share)				$ 0.34	$ 0.33
Dividends paid per common share (in dollars per share)	$ 0.33
Dividends declared and paid, preference shares				$ 9,189,000	$ 5,595,000
Dividends declared and paid, common shares				$ 14,500,000	$ 13,200,000
Shares issued (in shares)				16,010,000		16,010,000
Common Shares
Class of Stock [Line Items]
Dividends per common share (in dollars per share)		$ 0.34
Share repurchase program, authorized amount							$ 500,000,000.0
Share repurchase program, shares repurchased (in shares)				0
Share repurchase program, remaining authorized aggregate amount				$ 500,000,000.0
Series C Preference Shares
Class of Stock [Line Items]
Dividend rate, percentage				6.08%
Liquidation preference per annum (in dollars per share)				$ 1.52
Liquidation preference quarterly (in dollars per share)				$ 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
Liquidation preference quarterly (in dollars per share)				$ 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
Liquidation preference quarterly (in dollars per share)			359.375
Depositary Shares
Class of Stock [Line Items]
Liquidation preference per annum (in dollars per share)			1.4375
Liquidation preference quarterly (in dollars per share)			$ 0.359375

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