Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2016

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, 2015	1,267		$	16.59	0.9	$	33.7
Exercised	(165	)	$	16.81
Outstanding and exercisable at March 31, 2016	1,102		$	16.56	0.7	$	24.1
Exercised	(224	)	$	14.67
Outstanding and exercisable at June 30, 2016	878		$	17.04	0.5	$	10.9
Exercised	(230	)	$	15.83
Outstanding and exercisable at September 30, 2016	648		$	17.47	0.3	$	11.5

Nonvested Restricted Stock Activity

	Shares subject to restriction (thousands)		Weighted average price
Nonvested at December 31, 2015	1,326		$	53.18
Granted	668		$	29.61
Vested	(493	)	$	46.06
Forfeited	(19	)	$	42.84
Nonvested at March 31, 2016	1,482		$	45.03
Granted	25		$	38.62
Vested	(55	)	$	60.23
Forfeited	(12	)	$	47.22
Nonvested at June 30, 2016	1,440		$	44.32
Granted	31		$	33.19
Vested	(3	)	$	60.41
Forfeited	(18	)	$	42.46
Nonvested at September 30, 2016	1,450		$	44.08