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Earnings Per Share, Textuals (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Potential dilutive effect of options and Warrants |  |  |  |
Options outstanding to purchase common shares | 20,791 | 20,791 |  | 20,791
Average exercise price per share | $ 80.01 | $ 80.01 |  | $ 80.01
Dividends |  |  |  |
Cash dividends paid |  | $ 12.8 | $ 11.6 |
Cash dividends paid per share | $ 0.35 | $ 0.70 | $ 0.60 |
Treasury Stock, Number of Shares and Restriction Disclosures [Abstract] |  |  |  |
Repurchase of common stock |  | 346,781 | 654,277 |
Weighted-average price per share of common stock repurchased |  | $ 69.25 | $ 61.95 |
Repurchase of common stock, total cost |  | 24.0 | 40.5 |
Common share amount available for additional share repurchase |  | $ 93.6 |  | $ 117.6
Warrant Transactions |  |  |  |
Potential dilutive effect of options and Warrants |  |  |  |
Number of common shares underlying the Warrants outstanding | 3,600,000 | 3,600,000 | 3,600,000 |
Average exercise price of common shares underlying Warrants | 60.89 | 60.89 | 61.19 |

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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- Definition Aggregate dividends paid 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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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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