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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2016 |  | 168,546 |  |  | $ | 111.91 |
Granted |  | 8,543 |  |  | 200.79 |
Vested |  | (17,338 | ) |  | 127.83 |
Forfeited |  | (451 | ) |  | 198.81 |
Non-vested as of December 31, 2017 |  | 159,300 |  |  | $ | 114.70 |
Summary Of Restricted Stock Units Activity | A summary of the restricted stock unit activity under the Incentive Plan for the year ended December 31, 2017, 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, 2016 |  | 455,823 |  |  | $ | 101.75 |  |  |  |  |
Granted |  | 108,100 |  |  | 206.45 |  |  |  |  |
Converted |  | (34,836 | ) |  | 40.12 |  |  |  |  |
Forfeited |  | (6,260 | ) |  | 178.07 |  |  |  |  |
Outstanding as of December 31, 2017 (1) |  | 522,827 |  |  | $ | 126.59 |  |  | $ | 169.1 |  |  | 5.2
Vested as of December 31, 2017 |  | 258,195 |  |  | $ | 106.67 |  |  | $ | 83.5 |  |  | 4.2
(1) | No RSUs outstanding at December 31, 2017 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, 2017 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,
| 2017 |  | 2016 |  | 2015
Restricted stock | $ | 2.9 |  |  | $ | 2.8 |  |  | $ | 3.2 |
Restricted stock units | 12.5 |  |  | 4.6 |  |  | 9.2 |
Total | $ | 15.4 |  |  | $ | 7.4 |  |  | $ | 12.4 |
Schedule Of Future Share-Based Compensation Cost | over a weighted average period of 1.8 years, as follows:
(In millions) |  |  |  |  |  |
For the Years Ended December 31, |  | Restricted Stock Units |  | Restricted Stock |  | Total Projected Expense
2018 |  | $ | 8.0 |  |  | $ | 2.1 |  |  | $ | 10.1 |
2019 |  | 4.5 |  |  | 1.4 |  |  | 5.9 |
2020 |  | 2.2 |  |  | 1.1 |  |  | 3.3 |
2021 |  | 0.5 |  |  | 0.9 |  |  | 1.4 |
2022 |  | 0.1 |  |  | 0.8 |  |  | 0.9 |
Thereafter |  | — |  |  | 1.7 |  |  | 1.7 |
Total |  | $ | 15.3 |  |  | $ | 8.0 |  |  | $ | 23.3 |

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