Stock-Based Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2016

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

Summary of Stock Option Award Activity

The following table presents a summary of our stock option award activity for the three months ended March 31, 2016:

	Number of Shares		Weighted Average Exercise Price
Outstanding at December 31, 2015	8,724,631		$	27.16
Granted	934,611		34.63
Exercised	(44,137	)	16.30
Forfeited, canceled or expired	(6,134	)	48.52
Outstanding at March 31, 2016	9,608,971		27.92

Summary of Restricted Stock Award Activity

The following table presents a summary of restricted stock award activity for the three months ended March 31, 2016:

	Shares of Restricted Stock (“RS”)				Restricted Stock Units (“RSU”)
	Number of Shares		Weighted Average Grant Date Fair Value		Number of Units	Weighted Average Grant Date Fair Value
Outstanding at December 31, 2015	1,074,543		$	47.70	513,220	$	24.59
Granted	142,698		34.93		10,804	45.42
RS’s Vested/RSU’s Issued	(106,788	)	44.63		—	—
Forfeited	(16,362	)	47.92		—	—
Outstanding at March 31, 2016	1,094,091		46.33		524,024	25.02

Schedule of Performance Unit Awards

The following table presents a summary of the activity for performance unit awards to be settled in shares for the three months ended March 31, 2016:

	Number of Units		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2015	6,145,442		$	0.92
Granted	2,329,500		0.57
Exercised	(1,764,792	)	0.95
Canceled	(314,972	)	0.93
Outstanding at March 31, 2016	6,395,178		0.78