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Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2016 | Mar. 15, 2016 | Mar. 31, 2016 | Mar. 31, 2015 | Feb. 19, 2016
Class of Stock [Line Items] |  |  |  |  |
Dividends declared per common share |  |  | $ 0.31 | $ 0.30 |
Dividends declared and paid, Preference shares |  |  | $ 5,595,000 | $ 5,595,000 |
Retained Earnings |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Dividends declared and paid, Preference shares |  |  | 5,595,000 | 5,595,000 |
Dividends declared and paid, Common shares |  |  | $ 13,285,000 | $ 13,720,000 |
Common Shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Dividends declared per common share |  | $ 0.31 |  |  |
Dividends per common share | $ 0.31 |  |  |  |
Share repurchase program, Authorized amount |  |  |  |  | $ 500,000,000
Common shares repurchased during period, Number of shares |  |  | 769 |  |
Common shares repurchased during period, Aggregate amount |  |  | $ 85,200,000 |  |
Common shares repurchased during period, Average cost per share, in usd per share |  |  | $ 110.72 |  |
Share repurchase program, Remaining authorized aggregate amount | $ 494,100,000 |  | $ 494,100,000 |  |

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