Stock-Based Compensation

3 Months Ended

Mar. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Total stock-based compensation expense by type of award was as follows:



	Three months ended March 31,
	2017		2016
	(In millions)
Stock appreciation rights	$	2.4	$	0.4
Stock options	0.4		0.2
Restricted shares, service based	1.2		0.8
Restricted shares, performance based	2.6		0.8
Employee stock purchase plan	0.2		0.1
Total stock-based compensation expense	$	6.8	$	2.3

The increase of $4.5 million in stock-based compensation is primarily a result of increases in the fair value of the stock appreciation rights and accelerated vesting of stock awards to a former executive officer.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

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