Stock-Based Compensation

9 Months Ended

Sep. 30, 2024

Share-Based Payment Arrangement [Abstract]

Stock-Based Compensation

Stock-Based Compensation

Stock-based compensation cost by award type follows:

(in millions)	Three Months Ended September 30,				Nine Months Ended September 30,
	2024		2023		2024		2023
Stock option awards	$	3.5	$	3.6	$	10.8	$	11.0
Performance share awards	2.7		2.2		7.4		6.8
Restricted stock awards	1.8		1.8		7.4		6.6
Total stock-based compensation cost incurred	8.0		7.6		25.6		24.4
Capitalized cost during the period	(0.7)		(1.1)		(2.5)		(3.4)
Amortization of capitalized cost during the period	0.7		1.1		2.6		3.6
Total stock-based compensation expense	$	8.0	$	7.6	$	25.7	$	24.6