Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2011

Stock-Based Compensation

Stock-based compensation expense

	Three Months Ended June 30,				Six Months Ended June 30,
	2011		2010		2011		2010
Stock options	$	1.6	$	1.5	$	3.2	$	2.8
Restricted stock	0.4		0.2		0.6		0.5
Total stock-based compensation pre-tax	2.0		1.7		3.8		3.3
Tax benefit	0.2		0.2		0.5		0.5
Total stock-based compensation net of tax	$	1.8	$	1.5	$	3.3	$	2.8

Assumptions regarding volatility, expected life, dividend yield and risk free interest

	2011	2010
Risk-free interest rate	2.13%-3.12%	1.73%-3.46%
Expected life	6.5 years	6.5 years
Volatility	57.2%	62.0%
Expected dividend yield	0.0%	0.0%

Schedule of stock option activity

	Shares Subject to Options		Weighted Average Option Price		Weighted Average Remaining Contractual Term (Yrs)	Aggregate Intrinsic Value (in millions) (b)
Outstanding at December 31, 2010	4,718,648		$	9.99
Granted	162,500		18.45
Exercised	(306,585	)	9.56			$	2.9
Forfeited	(95,755	)	10.87
Outstanding at June 30, 2011	4,478,808		$	10.31	6.1	$	44.9
Exercisable at June 30, 2011	2,498,976		$	8.87	5.0	$	28.7
Exercisable and expected to vest at June 30, 2011 (a)	4,375,857		$	10.29	6.1	$	44.1

(a)In addition to the options that are exercisable at June 30, 2011, the Company expects a portion of the unvested options to become exercisable in the future. Options expected to vest in the future are determined by applying an estimated forfeiture rate to the options that are unvested as of June 30, 2011.

(b) The aggregate intrinsic value is based on the positive difference between the fair value of the Company’s common stock price of $20.36 on June 30, 2011, or the date of exercises, as appropriate, and the exercise price of the underlying stock options.

Schedule of restricted stock activity

	Shares Subject to Restriction		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2010	247,258		$	8.02
Granted	156,822		21.28
Vested	(46,420	)	7.69
Forfeited	(300	)	7.55
Outstanding at June 30, 2011	357,360		$	13.88