Stock-Based and Other Incentive Compensation (Tables)

12 Months Ended

Dec. 31, 2014

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

Stock options outstanding under equity-based compensation plans

A summary of the changes in stock options outstanding under our equity-based compensation plans during 2014 is presented below:

	Number of Options		Weighted Average Remaining Contract Term (Years)	Weighted Average Exercise Price		Aggregate Intrinsic Value
Options outstanding as of December 31, 2013	2.6		4.2	$	10.46	$	17.8
Granted	0.6			$	13.98	—
Exercised	(0.2	)		$	9.11	$	0.6
Cancelled	(1.4	)		$	10.86	—
Options outstanding as of December 31, 2014	1.6		6.3	$	11.61	$	4.0
Options exercisable as of December 31, 2014	0.9		4.7	$	10.74	$	2.7
Options expected to vest after December 31, 2014	0.7		8.5	$	12.69	$	1.2

Schedule of valuation assumptions

The fair value of each option grant is estimated on the date of grant using the Black-Scholes option pricing model. The weighted-average assumptions used in the model are outlined in the following table:

	2014		2013		2012
Assumptions:
Expected volatility	57	%	60	%	56	%
Risk-free interest rate	2.3	%	2.2	%	1.3	%
Dividend yield	—		—		—
Expected life (in years)	6		6		6

RSUs outstanding under equity-based compensation plans

A summary of the changes in RSUs outstanding under our equity-based compensation plans during 2013 is presented below:

	Number of Restricted Stock Units		Weighted Average Grant Date Fair Value
Unvested RSUs as of December 31, 2013	5.2		$	11.93
Granted	3.2		$	13.86
Vested	(2.6	)	$	11.53
Cancelled	(0.8	)	$	13.82
Unvested RSUs as of December 31, 2014	5.0		$	13.12