Stock-Based and Other Incentive Compensation (Tables)

12 Months Ended

Dec. 31, 2015

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 2015 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, 2014	1.6		6.3	$	11.61	$	4.0
Granted	0.8			$	12.76	$	—
Exercised	(0.3	)		$	9.68	$	1.2
Cancelled	(0.3	)		$	14.52	$	—
Options outstanding as of December 31, 2015	1.8		7.5	$	12.04	$	0.1
Options exercisable as of December 31, 2015	0.7		5.6	$	10.54	$	0.1
Options expected to vest after December 31, 2015	1.1		8.8	$	13.00	$	—

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:

	2015		2014		2013
Assumptions:
Expected volatility	52	%	57	%	60	%
Risk-free interest rate	1.7	%	2.3	%	2.2	%
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 2015 is presented below:

	Number of Restricted Stock Units		Weighted Average Grant Date Fair Value
Unvested RSUs as of December 31, 2014	5.0		$	13.12
Granted	2.9		$	12.95
Vested	(1.5	)	$	13.12
Cancelled	(0.8	)	$	14.32
Unvested RSUs as of December 31, 2015	5.6		$	13.05