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


	Three Months Ended March 31,
(in millions)	2023		2022
Expense:
RSUs	$	19.0	$	39.1
PRSUs		1.8		2.0
Employee stock purchase plan		2.2		2.2
	$	23.0	$	43.3

The following table summarizes RSU and PRSU activity for the three months ended March 31, 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		0.6		$	64.18
Vested during 2023		(0.6	)	$	62.66
Unvested at March 31, 2023		0.9		$	64.09

In March 2023, the Company’s board of directors approved an amendment and restatement of the Company's 2020 Incentive Compensation Plan (the “Incentive Compensation Plan”), effective May 9, 2023. The Incentive Compensation Plan, which is subject to stockholder approval, increases the maximum number of shares of Company common stock available for grant from 4.3 million to 6.5 million.