Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2012

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

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The following table summarizes the components of the Company’s stock-based compensation expense included in general and administrative expenses in the consolidated financial statements:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2012			2011			2012			2011
	(In millions)
Pre-tax compensation expense	$	4.2		$	1.6		$	11.2		$	8.0
Tax provision	(1.6		)	(0.6		)	(4.3		)	(3.2		)
Total stock-based compensation expense, net of tax	$	2.6		$	1.0		$	6.9		$	4.8

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following summarizes the assumptions used in the Black-Scholes model:

Risk-free interest rate	0.86		%
Weighted average historical volatility	83.6		%
Dividend yield	—
Expected years until exercise	4.66
Forfeitures	11.0		%
Weighted average fair value of options granted	$	33.11

Schedule of Share-based Compensation, Stock Options, Activity

Option balances as of September 30, 2012 and activity related to the Company’s stock options during the nine months then ended were as follows:

	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in Years)	Aggregate Intrinsic Value
Outstanding at December 31, 2011	1,318,640		$	32.06
Granted	147,674		$	51.63
Exercised	(352,266	)	$	16.20
Forfeited	(50,778	)	$	44.49
Outstanding at September 30, 2012	1,063,270		$	39.44	6.47	$	17,740,000
Vested at September 30, 2012 and Expected to Vest	1,022,929		$	39.07	6.38	$	17,447,000
Exercisable at September 30, 2012	690,212		$	35.49	5.37	$	14,220,000

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity

A summary of restricted stock activity for the nine months ended September 30, 2012 is presented below:

	Restricted Stock		Weighted Average Grant Date Fair Value	Restricted Stock Units		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2011	486,533		$31.25	18,000		$29.32
Granted	126,006		$51.75	19,152		$52.23
Released	(176,521	)	$13.55	(3,910	)	$40.58
Forfeited	(84,325	)	$44.09	—		—
Outstanding at September 30, 2012	351,693		$44.28	33,242		$41.19