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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Summary Of Restricted Stock Activity | A summary of the non-vested restricted stock activity under the Incentive Plan for the year ended December 31, 2020 is presented below:
Restricted Stock |  | Number of Shares |  | Weighted Average Grant-Date Fair Value Per Share
Non-vested as of December 31, 2019 |  | 137,503 |  |  | $ | 125.04 |
Vested |  | (14,633) |  |  | 182.61 |
Forfeited |  | (152) |  |  | 362.80 |
Non-vested as of December 31, 2020 |  | 122,718 |  |  | $ | 117.88 |
Summary Of Restricted Stock Units Activity | A summary of the restricted stock unit activity under the Incentive Plan for the year ended December 31, 2020, 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, 2019 |  | 428,831 |  |  | $ | 132.99 |  |  |  |  |
Granted |  | 5,870 |  |  | 436.89 |  |  |  |  |
Converted |  | (21,971) |  |  | 105.97 |  |  |  |  |
Forfeited |  | (128) |  |  | 434.60 |  |  |  |  |
Outstanding as of December 31, 2020 (1) |  | 412,602 |  |  | $ | 138.65 |  |  | $ | 142.8 |  |  | 3.6
Vested as of December 31, 2020 |  | 320,250 |  |  | $ | 132.24 |  |  | $ | 110.9 |  |  | 3.2
(1)No RSUs outstanding at December 31, 2020 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, 2020 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,
| 2020 |  | 2019 |  | 2018
Restricted stock | $ | 2.0 |  |  | $ | 3.0 |  |  | $ | 2.7 |
Restricted stock units | 4.2 |  |  | 4.6 |  |  | 7.6 |
Total | $ | 6.2 |  |  | $ | 7.6 |  |  | $ | 10.3 |
Schedule Of Future Share-Based Compensation Cost | Assuming performance targets are achieved in the periods currently estimated, we expect to recognize the remaining expense for stock-based awards outstanding as of December 31, 2020 over a weighted average period of 2.2 years, as follows:
(In millions) |  |  |  |  |  |
For the Years Ended December 31, |  | Restricted Stock Units |  | Restricted Stock |  | Total Projected Expense
2021 |  | $ | 1.2 |  |  | $ | 1.2 |  |  | $ | 2.4 |
2022 |  | 0.3 |  |  | 0.9 |  |  | 1.2 |
2023 |  | 0.1 |  |  | 0.7 |  |  | 0.8 |
2024 |  | — |  |  | 0.5 |  |  | 0.5 |
2025 |  | — |  |  | 0.3 |  |  | 0.3 |
Thereafter |  | — |  |  | 0.2 |  |  | 0.2 |
Total |  | $ | 1.6 |  |  | $ | 3.8 |  |  | $ | 5.4 |

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