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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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