Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

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

Stock Options Activity

	Shares under option (thousands)		Weighted average exercise price		Weighted average remaining contractual life (in years)	Aggregate intrinsic value (in millions)
Outstanding and exercisable at December 31, 2016	473		$	17.47	0.1	$	10.4
Exercised	(473	)	$	17.47
Outstanding and exercisable at March 31, 2017	—

Nonvested Restricted Stock Activity

	Shares subject to restriction (thousands)		Weighted average price
Nonvested at December 31, 2016	1,429		$	44.12
Granted	777		$	40.07
Vested	(453	)	$	57.35
Forfeited	(28	)	$	41.87
Nonvested at March 31, 2017	1,725		$	39.27