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Earnings Per Share, Textuals (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 01, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Potential dilutive effect of options and Warrants |  |  |  |  |  |
Options outstanding to purchase common shares |  | 16,645 |  | 16,645 |  | 16,645
Average exercise price per share |  | $ 80.01 |  | $ 80.01 |  | $ 80.01
Add: dilutive effect of warrants |  | 939,000 | 505,000 | 0 | 490,000 |
Dividends |  |  |  |  |  |
Cash dividends paid |  |  |  | $ 14.0 | $ 12.8 |
Cash dividends paid per share |  |  |  | $ 0.80 | $ 0.70 |
Treasury Stock, Number of Shares and Restriction Disclosures [Abstract] |  |  |  |  |  |
Repurchase of common stock |  | 552,454 |  |  | 346,781 |
Weighted-average price per share of common stock repurchased |  | $ 75.21 |  |  | $ 69.25 |
Repurchase of common stock, total cost |  | $ 41.5 |  | $ 41.5 | $ 24.0 |
Common share amount available for additional share repurchase |  | $ 131.2 |  | $ 131.2 |  |
Warrant Transactions |  |  |  |  |  |
Potential dilutive effect of options and Warrants |  |  |  |  |  |
Number of common shares underlying the Warrants outstanding |  | 3,700,000 |  | 3,700,000 |  |
Average exercise price of common shares underlying Warrants |  | $ 60.44 |  | $ 60.44 |  |
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 |
Warrants [Member] |  |  |  |  |  |
Potential dilutive effect of options and Warrants |  |  |  |  |  |
Add: dilutive effect of warrants |  | 939,221 | 505,151 |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Potential dilutive effect of options and Warrants |  |  |  |  |  |
Trading days warrants are exercisable | 120 days |  |  |  |  |

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