Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2015

Stockholders' Equity Note [Abstract]

Schedule of Change in the Number of Shares of Class A Common Stock

The following table presents the change in the number of shares of our Class A common stock outstanding during the nine months ended September 30, 2015 and during the year ended December 31, 2014:

	Nine Months Ended September 30, 2015	Twelve Months Ended December 31, 2014
Shares outstanding as of beginning of period	85.1	85.2
Shares issued as part of equity-based compensation plans and the ESPP, net of RSUs surrendered	1.1	1.9
Common stock repurchases	—	(2.0	)
Shares outstanding as of end of period	86.2	85.1