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Earnings Per Share, Textuals (Details) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 18, 2013 | Apr. 30, 2013 | Jun. 30, 2008 | Jun. 30, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jul. 15, 2013 Warrant Transactions | Jun. 30, 2013 Warrant Transactions
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 |  |
Potential dilutive effect of options outstanding |  |  |  |  | 0 |  | 0 |  |
Number of common shares underlying the Warrants outstanding |  |  |  |  |  |  |  |  | 3,600,000
Average exercise price of common shares underlying Warrants |  |  |  |  |  |  |  | 61.14 | 61.19
Dividends |  |  |  |  |  |  |  |  |
Cash dividends paid |  |  |  |  | $ 11.6 | $ 9.8 |  |  |
Cash dividends paid per share |  |  |  | $ 0.30 | $ 0.60 | $ 0.50 |  |  |
Treasury Stock, Number of Shares and Restriction Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount by Board of Directors |  | 75.0 | 75.0 |  |  |  |  |  |
Common share amount available for additional share repurchase | 79.6 |  |  |  | 81.4 |  | 46.9 |  |
Repurchase of common stock | 28,600 |  |  |  | 654,277 |  |  |  |
Weighted-average price per share of common stock repurchased | $ 63.51 |  |  |  | $ 61.95 |  |  |  |
Repurchase of common stock |  |  |  |  | $ 40.5 |  |  |  |

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