Stockholders' Deficit (Tables)

9 Months Ended

Sep. 30, 2016

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

Summary of Stock Options and RSUs Outstanding

A summary of our stock-based compensation plans follows:

	As of September 30, 2016
Options outstanding	3.2
Remaining unrecognized expense related to unvested options	$8.3
RSUs Outstanding	5.6
Remaining unrecognized expense related to unvested RSUs	$52.8

Schedule of Unrecognized Compensation Cost

A summary of our stock-based compensation plans follows:

	As of September 30, 2016
Options outstanding	3.2
Remaining unrecognized expense related to unvested options	$8.3
RSUs Outstanding	5.6
Remaining unrecognized expense related to unvested RSUs	$52.8

Schedule of Stock-based Compensation Expense Recognized

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016		2015
Stock-based compensation expense recognized:
Related to vesting of stock options	$	2.9	$	0.6	$	4.2	$	1.5
Related to vesting of RSUs	8.1		6.6		19.3		17.6
Total	$	11.0	$	7.2	$	23.5	$	19.1