Stock-Based Compensation

3 Months Ended

Mar. 31, 2023

Share-Based Payment Arrangement [Abstract]

Stock-Based Compensation

Stock-Based Compensation

Stock-based compensation cost by award type follows:

(in millions)	Three Months Ended March 31,
	2023		2022
Stock option awards	$	5.5	$	3.1
Restricted stock awards	3.2		3.3
Performance share awards	2.4		3.2
Total stock-based compensation cost incurred	11.1		9.6
Capitalized cost during the period	(1.7)		—
Amortization of capitalized cost during the period	2.0		—
Total stock-based compensation expense	$	11.4	$	9.6