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Earnings Per Share, Other Disclosures (Details) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 19, 2013 | Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Mar. 31, 2013 Warrant Transactions | Apr. 15, 2013 Warrant Transactions
Potential dilutive effect of options and Warrants |  |  |  |  |  |
Options outstanding to purchase common shares |  | 20,791 |  | 20,791 |  |
Average exercise price per share |  | $ 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 |  |  |  |  | 61.25 | 61.19
Potential dilutive effect of shares underlying the Warrants |  |  |  |  | 91,779 |
Dividends |  |  |  |  |  |
Cash dividends paid |  | $ 5.9 | $ 4.9 |  |  |
Cash dividends paid per share |  | $ 0.30 | $ 0.25 |  |  |
Treasury Stock, Number of Shares and Restriction Disclosures [Abstract] |  |  |  |  |  |
Common share amount available for additional share repurchase | 92.8 | 30.7 |  | 46.9 |  |
Repurchase of common stock | 210,835 | 259,596 |  |  |  |
Weighted-average price per share of common stock repurchased | $ 60.94 | $ 62.62 |  |  |  |
Repurchase of common stock |  | $ 16.2 |  |  |  |

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