Stock and Stock-Based Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2020

Share-based Payment Arrangement [Abstract]

Summary of stock-based compensation expense by type of award

The following table summarizes our stock-based compensation expense by type of award (in millions):

	Three Months Ended March 31,
	2020		2019
PRSUs	$	1.5	$	3.6
RSUs	3.5		2.8
Total stock-based compensation expense	$	5.0	$	6.4