Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

Share-based Payment Arrangement [Abstract]

Schedule of stock-based compensation expense by award type

The tables below summarize the Company's stock-based compensation expense by award type and expense category line item during the periods indicated (in millions).

	Three Months Ended				Six Months Ended
	June 30,				June 30,
Award type	2020		2019		2020		2019
Stock appreciation rights	$	1.9	$	0.9	$	3.6	$	4.8
Restricted stock units	13.6		12.0		36.8		39.7
Common stock equivalents	0.2		0.2		0.4		0.4
Total (1)	$	15.7	$	13.1	$	40.8	$	44.9

Schedule of stock-based compensation expense by expense category

	Three Months Ended				Six Months Ended
	June 30,				June 30,
Expense category line item	2020		2019		2020		2019
Cost of services and product development	$	7.1	$	6.2	$	19.2	$	17.5
Selling, general and administrative	8.6		6.7		21.6		27.1
Acquisition and integration charges (2)	—		0.2		—		0.3
Total (1)	$	15.7	$	13.1	$	40.8	$	44.9

(1) Includes charges of $5.2 million and $0.5 million during the three months ended June 30, 2020 and 2019, respectively, and $16.8 million and $21.4 million during the six months ended June 30, 2020 and 2019, respectively, for awards to retirement-eligible employees. Those awards vest on an accelerated basis.

(2) Includes charges related to acquisitions and related integration efforts.