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v2.4.1.9

Shareholders' Equity (Details) (USD $) | 3 Months Ended | 0 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 13, 2015
Class of Stock [Line Items] |  |  |  |
Dividends declared per common share, in usd per share | $ 0.3 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.29 us-gaap_CommonStockDividendsPerShareDeclared |  |
Dividends declared and paid, Preference shares | $ 5,595,000 us-gaap_DividendsPreferredStock | $ 5,595,000 us-gaap_DividendsPreferredStock |  |
Retained Earnings |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends declared and paid, Preference shares | 5,595,000 us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 5,595,000 us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Dividends declared and paid, Common shares | 13,720,000 us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 11,899,000 us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Common Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends declared per common share, in usd per share |  |  |  | $ 0.30 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Dividends per common share, in usd per share |  |  | $ 0.3 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Share repurchase program, Remaining authorized aggregate amount | $ 500,000,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | $ 500,000,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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