Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2014

Employee Benefit and Other Plans [Abstract]

Schedule of Employee Benefit Plans

We recorded share-based compensation expense as follows:

	For the three months ended March 31,
	2014		2013
	(in millions)
Share-based compensation expense	$	3.2	$	1.8

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

Stock options: The following table summarizes information related to our common stock options:

	Number of Stock Options		Weighted Average Exercise Price
Options outstanding at January 1, 2014	5,509,246		$	14.01
Granted	128,700		$	23.08
Exercised	(161,022	)	$	13.44
Canceled or forfeited	(118,200	)	$	18.01
Options outstanding at March 31, 2014	5,358,724		$	14.15
Options exercisable at March 31, 2014	2,748,717		$	12.34
Expected to vest after March 31, 2014	1,989,323		$	16.32

Schedule of Stock Option Activity

The following information is provided for our stock options:

	For the three months ended March 31,
	2014		2013
Weighted-average grant date fair value	$	9.68	$	7.82

Schedule of Restricted Stock Units Activity

Restricted Stock Units: The following table summarizes information related to our restricted stock units:

	Number of Shares		Weighted Average Grant Date Fair Value
Unvested shares at January 1, 2014	629,518		$	20.11
Granted	114,138		$	23.64
Vested	(19,115	)	$	13.42
Canceled or forfeited	(34,585	)	$	22.22
Unvested shares at March 31, 2014	689,956		$	20.99

Schedule of Performance Stock Units Activity

Performance Stock Units: The following table summarizes information related to our performance stock units:

	Number of Shares	Weighted Average Grant Date Fair Value
Unvested shares at January 1, 2014	431,858	$	22.79
Granted	123,283	$	26.50
Canceled or forfeited	—	$	—
Unvested shares at March 31, 2014	555,141	$	23.61