Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

Share-based Payment Arrangement, Noncash Expense [Abstract]

Summary of Restricted Stock and Performance Unit Award Activity

The following table presents restricted stock and performance unit award activity for the three months ended March 31, 2022:

	Restricted Stock					Performance Units
	Shares			Weighted Average Grant- Date Fair Value		Shares		Weighted Average Grant- Date Fair Value
Outstanding at January 1, 2022		651,448		$	109.16		358,092	$	105.38
Granted		170,232			145.26		96,309		154.21
Vested		(4,113	)		106.50		—		—
Forfeitures		(3,926	)		107.95		—		—
Outstanding at March 31, 2022		813,641		$	116.73		454,401	$	115.73

Compensation Expense for Share-Based Awards

Our share-based compensation expense is primarily 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 March 31,
	2022			2021
Restricted stock	$	9.2		$	8.6
Performance units		3.1			3.0
Total share-based compensation expense		12.3			11.6
Income tax benefit		(3.1	)		(2.9	)
Share-based compensation expense, net of tax benefit	$	9.2		$	8.7

Unrecognized Compensation Expense for Share-Based Awards

The unrecognized compensation expense for all share-based awards at March 31, 2022 was as follows (dollars in millions):

	March 31, 2022
	Unrecognized Compensation Expense		Remaining Weighted Average Recognition Period (in years)
Restricted stock	$	41.2		2.9
Performance units		29.7		2.7
Total unrecognized share-based compensation expense	$	70.9		2.8