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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2017 |  | 159,300 |  |  | $ | 114.70 |
Granted |  | 4,718 |  |  | 317.87 |
Vested |  | (12,651 | ) |  | 151.61 |
Forfeited |  | (720 | ) |  | 230.20 |
Non-vested as of December 31, 2018 |  | 150,647 |  |  | $ | 117.41 |
Summary Of Restricted Stock Units Activity | A summary of the restricted stock unit activity under the Incentive Plan for the year ended December 31, 2018, 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, 2017 |  | 522,827 |  |  | $ | 126.59 |  |  |  |  |
Granted |  | 4,235 |  |  | 363.11 |  |  |  |  |
Converted |  | (1,439 | ) |  | 159.08 |  |  |  |  |
Forfeited |  | (8,850 | ) |  | 206.45 |  |  |  |  |
Outstanding as of December 31, 2018 (1) |  | 516,773 |  |  | $ | 127.07 |  |  | $ | 197.3 |  |  | 4.3
Vested as of December 31, 2018 |  | 308,509 |  |  | $ | 114.92 |  |  | $ | 117.8 |  |  | 3.4
(1) | No RSUs outstanding at December 31, 2018 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, 2018 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,
| 2018 |  | 2017 |  | 2016
Restricted stock | $ | 2.7 |  |  | $ | 2.9 |  |  | $ | 2.8 |
Restricted stock units | 7.6 |  |  | 12.5 |  |  | 4.6 |
Total | $ | 10.3 |  |  | $ | 15.4 |  |  | $ | 7.4 |
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
2019 |  | $ | 4.6 |  |  | $ | 1.8 |  |  | $ | 6.4 |
2020 |  | 2.3 |  |  | 1.3 |  |  | 3.6 |
2021 |  | 0.5 |  |  | 0.9 |  |  | 1.4 |
2022 |  | 0.1 |  |  | 0.8 |  |  | 0.9 |
2023 |  | — |  |  | 0.7 |  |  | 0.7 |
Thereafter |  | — |  |  | 1.0 |  |  | 1.0 |
Total |  | $ | 7.5 |  |  | $ | 6.5 |  |  | $ | 14.0 |

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