Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 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 September 30,				For the nine months ended September 30,
	2014		2013		2014		2013
	(in millions)
Share-based compensation expense	$	1.4	$	3.1	$	10.1	$	8.2

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	894,180		$	23.41
Exercised	(458,545	)	$	13.58
Canceled or forfeited	(292,813	)	$	20.09
Options outstanding at September 30, 2014	5,652,068		$	15.22
Options exercisable at September 30, 2014	3,130,278		$	12.77
Expected to vest after September 30, 2014	1,898,726		$	18.55

Schedule of Stock Option Activity

The following information is provided for our stock options:

	For the nine months ended September 30,
	2014		2013
Weighted-average grant date fair value	$	8.93	$	10.53

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	579,918		$	23.55
Vested	(186,788	)	$	19.45
Canceled or forfeited	(105,915	)	$	22.59
Unvested shares at September 30, 2014	916,733		$	22.29

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	(34,819	)	$	23.14
Unvested shares at September 30, 2014	520,322		$	23.64