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Earnings Per Share, Textuals (Details) (USD $) In Millions, except Share data, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Potential dilutive effect of options and Warrants |  |  |
Options outstanding to purchase common shares | 18,606 |  | 20,791
Average exercise price per share | $ 80.01 |  | $ 80.01
Dividends |  |  |
Cash dividends paid | $ 19.1 | $ 17.3 |
Cash dividends paid per share | $ 1.05 | $ 0.90 |
Receipts of cash dividends from distribution of bankruptcy trust | 0 | 0.6 |
Treasury Stock, Number of Shares and Restriction Disclosures [Abstract] |  |  |
Repurchase of common stock | 410,589 | 707,077 |
Weighted-average price per share of common stock repurchased | $ 70.34 | $ 62.14 |
Repurchase of common stock, total cost | 28.9 | 43.9 |
Common share amount available for additional share repurchase | $ 88.7 |  | $ 117.6
Warrant Transactions |  |  |
Potential dilutive effect of options and Warrants |  |  |
Number of common shares underlying the Warrants outstanding | 3,700,000 | 3,600,000 |
Average exercise price of common shares underlying Warrants | 60.80 | 61.14 |

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