Common Stock (Tables)

3 Months Ended

Mar. 31, 2017

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

Stock Options Status and Activity

Stock Options — The following table reflects the status and activity for all options to purchase common stock for the period indicated:

	Three Months Ended March 31, 2017
	Shares Under Option		Weighted Avg. Exercise Prices		Weighted Avg. Remaining Life in Years	Aggregate Intrinsic Value
						(Millions)
Outstanding Stock Options
Outstanding, January 1, 2017	606,525		$	38.54	2.6	$	12
Canceled	(2,214	)	56.23			—
Forfeited	(1,107	)	56.23			—
Exercised	(164,863	)	33.70			5
Outstanding, March 31, 2017	438,341		$	40.22	2.6	$	11

Nonvested Restricted Shares

Restricted Stock — The following table reflects the status for all nonvested restricted shares for the period indicated:

	Three Months Ended March 31, 2017
	Shares		Weighted Avg. Grant Date Fair Value
Nonvested Restricted Shares
Nonvested balance at January 1, 2017	591,416		$	44.63
Granted	182,543		68.04
Vested	(261,003	)	50.95
Forfeited	(65,354	)	53.12
Nonvested balance at March 31, 2017	447,602		$	49.25