Stock-Based Compensation Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2012

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

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

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
	March 31,
	2012			2011
	(In millions)
Pre-tax compensation expense	$	4.5		$	3.1
Tax provision	(1.7		)	(1.2		)
Total stock-based compensation expense, net of tax	$	2.8		$	1.9

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

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 [Table Text Block]

Option balances as of March 31, 2012 and activity related to the Company’s stock options during the three 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	(164,954	)	$	12.40
Forfeited	(13,335	)	$	44.44
Outstanding at March 31, 2012	1,288,025		$	36.69	6.89	$	18,277,000
Vested at March 31, 2012 and Expected to Vest	1,220,562		$	36.09	6.77	$	17,958,000
Exercisable at March 31, 2012	812,691		$	31.82	5.68	$	14,914,000

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

A summary of restricted stock activity for the three months ended March 31, 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		$	31.18	18,000	$	29.32
Granted	120,123		$	51.85	19,152	52.23
Released	(125,914	)	$	7.00	—	—
Forfeited	(14,194	)	$	38.68	—	—
Outstanding at March 31, 2012	466,548		$	42.80	37,152	$	41.13