Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2014

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

Components of the Company’s stock-based compensation expense

The following table summarizes the components of the Company’s stock-based compensation expense included in general and administrative expenses in the Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2014 and 2013:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2014			2013			2014			2013
	(In millions)
Total stock-based compensation expense:
Equity classified awards expense	$	1.9		$	1.2		$	7.5		$	7.1
Liability classified awards expense (credit)	0.7			(0.8		)	1.2			(0.9		)
Total pre-tax stock-based compensation expense	2.6			0.4			8.7			6.2
Tax benefit	(1.0		)	(0.2		)	(3.3		)	(2.4		)
Total stock-based compensation expense, net of tax	$	1.6		$	0.2		$	5.4		$	3.8

Schedule of stock option valuation assumptions

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

Risk-free interest rate	1.57	%
Weighted average historical volatility	51.1	%
Dividend yield	3.68	%
Expected years until exercise	4.60
Forfeitures	11.0	%
Weighted average fair value of options granted	$26.87

Schedule of stock option activity

Stock option balances as of September 30, 2014 and activity related to stock options for the nine months ended September 30, 2014 were as follows:

	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in Years)	Aggregate Intrinsic Value (in Millions)
Outstanding at December 31, 2013	775,059		$	42.09
Granted	120,932		81.53
Exercised	(236,692	)	31.23
Forfeited	(14,804	)	68.01
Outstanding at September 30, 2014	644,495		52.88		6.2	$18.2
Vested at September 30, 2014 and Expected to Vest	618,897		51.88		6.1	$18.1
Exercisable at September 30, 2014	454,011		$	43.92	5.1	$16.9

Schedule of restricted stock unit activity

Outstanding balances as of September 30, 2014 and activity related to restricted stock and restricted stock units for the nine months ended September 30, 2014 were as follows:

	Restricted Stock		Weighted Average Grant Date Fair Value		Restricted Stock Units		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2013	266,252		$	58.87	47,230		$	64.57
Granted	94,658		81.52		13,879		81.65
Released	(85,981	)	52.83		(19,487	)	70.82
Forfeited	(29,397	)	66.52		—		—
Outstanding at September 30, 2014	245,532		$	68.88	41,622		$	66.92