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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 13, 2015 | Oct. 19, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Oct. 21, 2015
Subsequent Event [Line Items] |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  | $ 0.40 | $ 0.35 | $ 1.20 | $ 1.05 |
Repayments of Unsecured Debt |  |  |  |  | $ 6.1 | $ 0.0 |
Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.40 |  |  |  |  |  |
Cash dividends declared | $ 7.1 |  |  |  |  |  |
Subsequent Event | Warrant Transactions |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Exercise price per share of Warrants |  | $ 60.32 |  |  |  |  | $ 60.20
Warrant Transactions | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Issuance of stock warrants |  | 102,555 |  |  |  |  |
Shares owed and pending settlement |  | 8,200 |  |  |  |  |
Senior Notes |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Repayments of Unsecured Debt |  |  | $ 6.1 |  |  |  |
Senior Notes | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Percentage of principal amount repurchased |  | 107.50% |  |  |  |  |
Repayments of Unsecured Debt |  | $ 21.1 |  |  |  |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: 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.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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