Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Summary of Restricted Stock and Performance Unit Award Activity

The following table presents restricted stock and performance unit award activity for the nine months ended September 30, 2018:

	Restricted Stock					Performance Units
	Shares			Weighted Average Grant- Date Fair Value		Shares			Weighted Average Grant- Date Fair Value
Outstanding at January 1, 2018		739,732		$	77.23		226,558		$	77.07
Granted		173,144			114.63		87,022			115.33
Vested		(163,436	)		67.28		(46,876	)		74.46
Forfeitures		(3,738	)		81.04		—			—
Outstanding at September 30, 2018		745,702		$	88.07		266,704		$	90.01

Compensation Expense For Restricted Stock and Performance Units

Our share-based compensation expense is recorded in "Selling, general, and administrative expenses." Compensation expense for share-based awards recognized in the Consolidated Statements of Income, net of forfeitures, was as follows (dollars in millions):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Restricted stock	$	4.9		$	3.8		$	13.9		$	11.3
Performance units		1.7			1.4			3.5			4.1
Total share-based compensation expense		6.6			5.2			17.4			15.4
Income tax benefit		(1.6	)		(2.0	)		(4.4	)		(5.9	)
Share-based compensation expense, net of tax benefit	$	5.0		$	3.2		$	13.0		$	9.5

Unrecognized Compensation For Restricted Stock and Performance Units

The unrecognized compensation expense for all share-based awards at September 30, 2018 was as follows (dollars in millions):

	September 30, 2018
	Unrecognized Compensation Expense		Remaining Weighted Average Recognition Period (in years)
Restricted stock	$	36.5	2.5
Performance units		15.7		3.1
Total unrecognized share-based compensation expense	$	52.2		2.7