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Subsequent Events (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Apr. 11, 2012 6.90% Series E Cumulative Redeemable Preferred Shares Issuance of Equity | Mar. 31, 2012 7.50% Series C Preferred Shares | Dec. 31, 2011 7.50% Series C Preferred Shares | May 03, 2012 7.50% Series C Preferred Shares Repurchase of Equity
Subsequent Event [Line Items] |  |  |  |
Issuance of Preferred shares (in shares) | 4,000,000 |  |  |
Preferred shares, dividend rate (as a percent) | 6.90% | 7.50% | 7.50% | 7.50%
Preferred shares, par value (in dollars per share) | $ 25 | $ 0.01 | $ 0.01 |
Preferred shares, liquidation preference (in dollars per share) | $ 25 |  |  |
Preferred Stock, per share per annum (in dollars per share per annum) | $ 1.725 |  |  |
Proceeds from issuance of redeemable preferred shares | $ 96.3 |  |  |
Shares redeemed (in shares) |  |  |  | 2,000,000
Shares redeemed |  |  |  | 50.0
Dividends Payable, Amount |  |  |  | $ 0.2

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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 02 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph d Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4, 6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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