Stock-Based Compensation Plans (Tables)

6 Months Ended

Jun. 30, 2019

Share-based Compensation [Abstract]

Schedule of Stock Based Compensation Expense

Stock-based compensation expense consists of the following:

(In millions)	For the Three Months Ended   June 30,				For the Six Months Ended   June 30,
	2019		2018		2019		2018
Restricted stock	$	0.7	$	0.7	$	1.5	$	1.4
Restricted stock units	0.8		1.3		2.2		3.7
Total	$	1.5	$	2.0	$	3.7	$	5.1

Summary of Restricted Stock Activity

A summary of the non-vested restricted stock activity 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	(214	)	371.74
Non-vested as of June 30, 2019	137,763		$	125.48

Summary Of Restricted Stock Units Activity

A summary of the restricted stock unit activity is presented below:

Restricted Stock Units	Number of Restricted Stock Units		Weighted Average Grant-Date Fair Value Per Share
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 June 30, 2019	428,831		$	132.99