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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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