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Incentive Stock Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | A summary of the Company’s restricted shares is presented below:
| 2012 |  | 2011 |  | 2010
Restricted shares granted | 18,742 |  |  | 20,535 |  |  | 42,180 |
Weighted average price of restricted shares granted | $ | 42.40 |  |  | $ | 43.55 |  |  | $ | 29.91 |
(Amounts in millions) |  |  |  |  |
Intrinsic value of restricted stock outstanding (a) | $ | 2.1 |  |  | $ | 3.4 |  |  | $ | 4.9 |
Fair value of restricted stock vested | $ | 1.8 |  |  | $ | 2.6 |  |  | $ | 3.2 |
Cash used to pay the minimum withholding tax requirements in lieu of receiving common shares | $ | 0.6 |  |  | $ | 0.8 |  |  | $ | 0.8 |
(a) Intrinsic value of restricted stock outstanding is based on the market price of the Company's stock at December 31, 2012.
| 2012
| Number of Shares |  | Weighted Average Grant Date Fair Value
Non-vested Restricted Shares at January 1, | 76,185 |  |  | $ | 33.55 |
Granted | 18,742 |  |  | 42.40 |
Vested | (53,405 | ) |  | 33.73 |
Cancelled | (950 | ) |  | 35.55 |
Non-vested Restricted Shares at December 31, | 40,572 |  |  | 37.36 |
Schedule of Nonvested Performance-based Units Activity [Table Text Block] | A summary of the Company's performance share units is presented below:
| 2012 |  | 2011 |  | 2010
Common shares of Company stock reserved for performance shares | 337,360 |  |  | 470,820 |  |  | 606,180 |
Weighted average fair value of performance share units granted | $ | 56.36 |  |  | $ | 51.57 |  |  | $ | 39.25 |
(Amounts in millions) |  |  |  |  |
Intrinsic value of outstanding performance share units (a) | $ | 36.3 |  |  | $ | 46.0 |  |  | $ | 40.3 |
Fair value of performance shares vested | $ | 22.2 |  |  | $ | 9.9 |  |  | $ | 19.7 |
Cash used to pay the minimum withholding tax requirements in lieu of receiving common shares | $ | 7.2 |  |  | $ | 7.1 |  |  | $ | 5.3 |
(a) | Intrinsic value of outstanding performance share units is based on the market price of the Company's stock at December 31, 2012.
| 2012
| Number of Units |  | Weighted Average Grant Date Fair Value
Outstanding Performance Share units at January 1, | 1,030,075 |  |  | $ | 33.73 |
Granted | 168,680 |  |  | 56.36 |
Units Distributed | (488,570 | ) |  | 21.76 |
Cancelled/Adjustments | (9,360 | ) |  | 45.08 |
Outstanding Performance Share units at December 31, | 700,825 |  |  | 47.23 |
Expected volatility was estimated using daily returns on the Company’s common stock for the three-year period ending on the grant date. The risk-free rate was based on the 3-year U.S. treasury rate on the date of the award. The dividend yield was not used to calculate fair value as all awards granted after January 1, 2010 receive dividend equivalents. The following chart provides a tabular overview of the assumptions used in calculating the fair value of the awards granted for the three years ended December 31, 2012:
| 2012 |  | 2011 |  | 2010
Expected volatility | 36.9 | % |  | 51.3 | % |  | 51.7 | %
Risk-free rate | 0.4 | % |  | 1.0 | % |  | 1.4 | %
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | The following chart provides a tabular overview of the weighted average assumptions and related fair value calculations of options granted for the three years ended December 31, 2012:
| 2012 |  | 2011 |  | 2010
Expected volatility | 39.3 | % |  | 38.2 | % |  | 37.8 | %
Dividend yield | 3.6 | % |  | 3.9 | % |  | 4.7 | %
Risk-free rate | 1.3 | % |  | 2.6 | % |  | 3.2 | %
Expected life (in years) | 6.4 |  |  | 6.5 |  |  | 6.7 |
Fair value per share of options granted | $ | 11.85 |  |  | $ | 9.99 |  |  | $ | 7.07 |
Fair value of options granted (in millions) | 2.8 |  |  | 3.0 |  |  | 2.8 |
A summary of the status of the Company’s stock options as of and for the year ended December 31, 2012 is presented below:
| 2012
| Number of Shares |  | Weighted Average Exercise Price (per common share) |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in millions)
Options outstanding at January 1, | 2,346,451 |  |  | $ | 26.77 |  |  |  |  |
Granted | 234,110 |  |  | 44.42 |  |  |  |  |
Exercised | (960,662 | ) |  | 26.23 |  |  |  |  |
Cancelled | (11,570 | ) |  | 37.47 |  |  |  |  |
Options outstanding at December 31, | 1,608,329 |  |  | $ | 29.64 |  |  | 6.2 |  | $ | 35.2 |
Options vested and expected to vest | 1,607,293 |  |  | $ | 29.64 |  |  | 6.2 |  | $ | 35.2 |
Options exercisable at December 31, | 1,235,630 |  |  | $ | 26.71 |  |  | 5.5 |  | $ | 30.4 |
A summary of additional information pertaining to the Company’s stock options is presented below:
| 2012 |  | 2011 |  | 2010
(Amounts in millions) |  |  |  |  |
Intrinsic value of options exercised (a) | $ | 20.5 |  |  | $ | 10.4 |  |  | $ | 15.6 |
Fair value of options vested | $ | 3.3 |  |  | $ | 2.5 |  |  | $ | 2.4 |
(a) | Intrinsic value of options exercised is the amount by which the fair value of the stock on the exercise date exceeded the exercise price of the option.

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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