Long-Term Equity Compensation (Tables)

12 Months Ended

Dec. 31, 2014

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Weighted Average Assumptions

The following table provides the total intrinsic value of options exercised during the years ended December 31:

	2014		2013		2012
Total intrinsic value of options exercised	$	18,608,206	$	3,138,634	$	7,418,459

Summary of Options Outstanding and Exercisable

	Options Outstanding			Options Exercisable
Range of Exercise Prices	Number of Options	Weighted Average Remaining Contractual Life (Years)	Weighted Average Exercise Price	Number of Options	Weighted Average Exercise Price
$15.30 – 20.00	139,100	1.51	$15.41	139,100	$15.41
20.01 – 25.00	555,738	2.18	23.09	555,738	23.09
25.01 – 30.00	136,892	2.88	28.14	135,955	28.14
30.01 – 40.00	519,783	2.26	31.96	513,009	31.96
40.01 – 50.00	479,685	1.37	46.58	479,685	46.58
50.01 – 58.07	121,013	2.40	54.95	121,013	54.95
$15.30 – 58.07	1,952,211	2.02	$33.01	1,944,500	$33.01

Schedule of Options, Units, and Restricted Stock

The following table presents the number of stock options, RSUs and PSUs granted during the years ended December 31:

	2014	2013	2012
Options granted	—	—	—
RSUs and PSUs granted	881,338	1,143,881	1,084,532

Schedule of Share-Based Compensation Expense

Share-based compensation expense recorded for the years ended December 31, is as follows:

	2014		2013		2012
	(Amounts in millions)
Compensation expense - options	$	0.6	$	3.7	$	5.4
Compensation expense - RSUs and PSUs	$	27.7	$	26.2	$	23.5

Schedule of Unrecognized Compensation Costs and Related Weighted Average Period Costs

As of December 31, 2014, the remaining unrecognized compensation costs and the respective weighted-average recognition periods are as follows:

	Non-vested Options		Non-vested RSUs & PSUs
Remaining unrecognized compensation cost (in thousands)	$	28	$	32,321
Remaining weighted-average period (in years)	0.23		0.93

Stock Options [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Stock Options, RSUs and PSUs

A summary of option activity under our various plans as of December 31, 2014, and changes during the year then ended is presented below:

	Number of Options	Weighted Average Exercise Price	Weighted Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Outstanding at January 1, 2014	3,313,356	$31.33
Granted	—	—
Exercised	(1,320,086)	28.52
Forfeited or expired	(41,059)	42.01
Outstanding at December 31, 2014	1,952,211	$33.01	2.02	$	40,278,961
Vested or expected to vest at December 31, 2014 (reflecting estimated forfeiture rates effective in 2014)	1,952,045	$33.01	2.02	$	40,275,247
Exercisable at December 31, 2014	1,944,500	$33.01	2.01	$	40,109,115

Restricted Stock Units and Performance Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Stock Options, RSUs and PSUs

A summary of RSU and PSU activity under our various plans as of December 31, 2014, and changes during the year then ended is presented below:

	Number of Restricted Stock Units and Performance Share Units	Weighted Average Grant-Date Fair Value		Weighted Average Purchase Price		Weighted Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Outstanding at January 1, 2014	1,838,772	$	29.54		$—
Granted	881,338	32.25		—
Vested	(907,072)	29.68		—
Forfeited	(88,743)	30.21		—
Outstanding at December 31, 2014	1,724,295	$	30.82	—		0.87	$	92,301,511
Expected to vest at December 31, 2014 (reflecting estimated forfeiture rates effective in 2014)	1,649,410	$	30.84		$—	0.91	$	88,292,899

Weighted Average Grant Date Fair Value and Aggregate Intrinsic Value for RSU and PSU

The weighted-average grant-date fair values and aggregate intrinsic values of RSUs and PSUs vested during the years ended December 31, are as follows:

	2014		2013		2012
Weighted-average grant-date fair values of RSUs and PSUs vested	$	29.68	$	29.43	$	38.22
Aggregate intrinsic value of RSUs and PSUs vested (in millions)	$	30.5	$	18.5	$	49.0