Stock Based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

Summary of Stock Based Compensation Activity

The following table shows a summary of RSU activity during the three and nine months ended September 30, 2020 and 2019:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
RSU compensation expense	$	7.2	$	7.9	$	20.8	$	22.3
Income tax benefit	(1.4)		(1.4)		(3.8)		(4.1)
RSU compensation expense, net of tax	$	5.8	$	6.5	$	17.0	$	18.2
RSUs granted	32,844		29,195		294,794		254,591
Weighted average grant date fair value per unit	$	101.81	$	108.99	$	92.2	$	98.86
Total fair value of vested RSUs	$	4.8	$	6.4	$	29.2	$	33.2

The following table shows a summary of PSU activity during the three and nine months ended September 30, 2020 and 2019:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
PSU compensation expense	$	7.6	$	6.7	$	19.7	$	17.5
Income tax benefit	(0.8)		(1.0)		(2.1)		(2.5)
PSU compensation expense, net of tax	$	6.8	$	5.7	$	17.6	$	15.0
PSUs granted	—		—		302,274		246,219
Weighted average grant date fair value per unit	$	—	$	—	$	87.36	$	105.23
Total fair value of vested PSUs	$	0.3	$	1.9	$	24.7	$	19.6