Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

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
	March 31,
	2013			2012
	(In millions)
Total stock-based compensation:
Equity classified awards	$	3.2		$	3.8
Liability classified awards	0.5			0.7
Total pretax compensation expense	3.7			4.5
Tax benefit	(1.4		)	(1.7		)
Total stock-based compensation expense, net of tax	$	2.3		$	2.8

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	0.78		%
Weighted average historical volatility	83.4		%
Dividend yield	4.15		%
Expected years until exercise	4.61
Forfeitures	11.0		%
Weighted average fair value of options granted	$	36.00

Schedule of Share-based Compensation, Stock Options, Activity

Option balances as of March 31, 2013 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, 2012	958,246		$	39.67
Granted	81,328		72.28
Exercised	(78,445	)	38.48
Outstanding at March 31, 2013	961,129		42.53		6.8	$	25,500,000
Vested at March 31, 2013 and Expected to Vest	919,221		41.78		6.7	$	25,100,000
Exercisable at March 31, 2013	679,959		$	36.93	6.0	$	21,700,000

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

Equity Classified Awards - Restricted Stock and Restricted Stock Units

Outstanding balances as of March 31, 2013 and activity related to restricted stock and restricted stock units for the three months then ended is as follows:

	Restricted Stock		Weighted Average Grant Date Fair Value	Restricted Stock Units		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2012	346,563		$44.74	33,242		$41.19
Granted	84,113		$72.18	14,379		$72.04
Conversion of cash-settled restricted stock units	—		—	37,184		$72.28
Released	(89,009	)	$29.23	(39,000	)	$54.66
Forfeited	(11,602	)	$47.27	—		—
Outstanding at March 31, 2013	330,065		$55.77	45,805		$64.57

Liability Classified Awards - Restricted Stock Units

	Restricted Stock Units		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2012	37,184		$66.13
Conversion to stock-settled restricted stock units	(37,184	)	$72.28
Outstanding at March 31, 2013	—		—