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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Share-based Compensation [Abstract] |
Summary Of Restricted Stock Activity |
Restricted Stock |  | Number of Shares |  | Weighted Average Grant-Date Fair Value Per Share
Non-vested as of December 31, 2014 |  | 190,400 |  |  | $ | 107.51 |
Granted |  | 4,860 |  |  | 183.30 |
Vested |  | (12,113 | ) |  | 110.46 |
Forfeited |  | (836 | ) |  | 143.25 |
Non-vested as of December 31, 2015 |  | 182,311 |  |  | $ | 109.17 |
Summary Of Restricted Stock Units Activity | A summary of the restricted stock unit activity under the Incentive Plan for the year ended December 31, 2015, is presented below:
Restricted Stock Units |  | Number of Restricted Stock Units |  | Weighted Average Grant-Date Fair Value Per Share |  | Aggregate Intrinsic Value (2) (in millions) |  | Weighted Average Remaining Contractual Term (in years)
Outstanding as of December 31, 2014 |  | 862,682 |  |  | $ | 61.93 |  |  |  |  |
Granted |  | 1,500 |  |  | 139.00 |  |  |  |  |
Converted |  | (1,348 | ) |  | 119.33 |  |  |  |  |
Forfeited |  | (3,415 | ) |  | 122.81 |  |  |  |  |
Outstanding as of December 31, 2015 (1) |  | 859,419 |  |  | $ | 61.73 |  |  | $ | 183.9 |  |  | 3.9
Vested as of December 31, 2015 |  | 532,160 |  |  | $ | 33.74 |  |  | $ | 113.9 |  |  | 1.3
(1) | No RSUs outstanding at December 31, 2015 were convertible to shares of common stock.
(2) | The intrinsic value of RSUs is measured by applying the closing stock price as of December 31, 2015 to the applicable number of units.
Schedule Of Stock Based Compensation Expense | Stock-based compensation expense consists of the following:
(In millions) | For the Years Ended December 31,
| 2015 |  | 2014 |  | 2013
Restricted stock | $ | 3.2 |  |  | $ | 3.3 |  |  | $ | 3.0 |
Restricted stock units | 9.2 |  |  | 12.0 |  |  | 5.5 |
Total | $ | 12.4 |  |  | $ | 15.3 |  |  | $ | 8.5 |
Schedule Of Future Share-Based Compensation Cost | over a weighted average period of 2.8 years, as follows:
(In millions) |  |  |  |  |  |
For the Years Ended December 31, |  | Restricted Stock Units |  | Restricted Stock |  | Total Projected Expense
2016 |  | $ | 4.5 |  |  | $ | 2.2 |  |  | $ | 6.7 |
2017 |  | 2.5 |  |  | 1.6 |  |  | 4.1 |
2018 |  | 1.7 |  |  | 1.3 |  |  | 3.0 |
2019 |  | 1.1 |  |  | 1.2 |  |  | 2.3 |
2020 |  | 0.8 |  |  | 1.1 |  |  | 1.9 |
Thereafter |  | 0.5 |  |  | 3.4 |  |  | 3.9 |
Total |  | $ | 11.1 |  |  | $ | 10.8 |  |  | $ | 21.9 |

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