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Stock-Based Compensation Plans (Tables)
 12 Months Ended
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 StockNumber of SharesWeighted Average Grant-Date Fair Value Per Share
Non-vested as of December 31, 2019137,503 $125.04 
Vested(14,633)182.61 
Forfeited(152)362.80 
Non-vested as of December 31, 2020122,718 $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 UnitsNumber of Restricted
Stock Units		Weighted Average Grant-Date Fair Value Per ShareAggregate Intrinsic
Value (2)
(in millions)		Weighted Average Remaining Contractual Term (in years)
Outstanding as of December 31, 2019428,831 $132.99   
Granted5,870 436.89   
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, 2020320,250 $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,
 202020192018
Restricted stock$2.0 $3.0 $2.7 
Restricted stock units4.2 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 StockTotal Projected Expense
2021$1.2 $1.2 $2.4 
20220.3 0.9 1.2 
20230.1 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