Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule Of Compensation Cost By Expense Category

The following table summarizes the stock-based compensation expense included in each of our operating expense categories:

	Three months ended September 30				Nine months ended September 30
(in millions)	2016		2015		2016		2015
Cost of revenue	$	1.5	$	2.1	$	5.5	$	6.2
Sales and marketing	0.3		0.6		1.3		1.7
General and administrative	1.0		1.9		3.8		5.6
Total stock-based compensation expense	$	2.8	$	4.6	$	10.6	$	13.5