Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2019

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, 2019 is presented below:

Restricted Stock	Number of Shares		Weighted Average Grant-Date Fair Value Per Share
Non-vested as of December 31, 2018	150,647		$	117.41
Granted	5,301		441.54
Vested	(17,971	)	148.14
Forfeited	(474	)	363.16
Non-vested as of December 31, 2019	137,503		$	125.04

Summary Of Restricted Stock Units Activity

A summary of the restricted stock unit activity under the Incentive Plan for the year ended December 31, 2019, 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, 2018	516,773		$	127.07
Granted	3,000		453.64
Converted	(87,842	)	106.54
Forfeited	(3,100	)	206.45
Outstanding as of December 31, 2019 (1)	428,831		$	132.99	$	189.7	4.1
Vested as of December 31, 2019	285,250		$	124.67	$	126.2	3.6

(1) No RSUs outstanding at December 31, 2019 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, 2019 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,
	2019		2018		2017
Restricted stock	$	3.0	$	2.7	$	2.9
Restricted stock units	4.6		7.6		12.5
Total	$	7.6	$	10.3	$	15.4

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, 2019 over a weighted average period of 1.7 years, as follows:

(In millions)
For the Years Ended December 31,	Restricted Stock Units		Restricted Stock		Total Projected Expense
2020	$	2.8	$	1.9	$	4.7
2021	0.6		1.2		1.8
2022	0.1		0.9		1.0
2023	—		0.7		0.7
2024	—		0.5		0.5
Thereafter	—		0.5		0.5
Total	$	3.5	$	5.7	$	9.2