Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [Abstract]

Costs Associated with Share-Based Compensation Plans

The following table summarizes the costs associated with the Company’s share-based compensation plans:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2023		2022		2023		2022
Expense:
RSUs	$	6.5	$	6.3	$	32.3	$	52.0
PRSUs		1.0		0.2		3.5		2.7
Employee stock purchase plan		1.4		1.7		5.1		5.5
	$	8.9	$	8.2	$	40.9	$	60.2

Summary of RSU Activity

The following table summarizes RSU and PRSU activity for the nine months ended September 30, 2023:

(in millions, except weighted-average grant-date fair value)	Shares			Weighted-average grant-date fair value
Unvested at December 31, 2022		0.9		$	63.01
Granted during 2023		0.8		$	63.23
Vested during 2023		(0.7	)	$	62.44
Unvested at September 30, 2023		1.0		$	63.62