Common Stock (Tables)

9 Months Ended

Sep. 30, 2018

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

Stock Options Status and Activity

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

	Nine Months Ended September 30, 2018
	Shares Under Option		Weighted Avg. Exercise Prices		Weighted Avg. Remaining Life in Years	Aggregate Intrinsic Value
						(Millions)
Outstanding Stock Options
Outstanding, January 1, 2018	318,016		$	43.60	2.6	$	5
Exercised	(4,607	)	26.78			—
Outstanding, March 31, 2018	313,409		43.84		2.1	4
Forfeited	(2,368	)	54.34			—
Outstanding, June 30, 2018	311,041		43.76		1.8	2
Exercised	(11,420	)	29.93			—
Outstanding, September 30, 2018	299,621		$	44.29	2.4	$	1

Nonvested Restricted Shares

The following table reflects the status for all nonvested restricted shares, share-settled RSUs and PSUs for the period indicated:

	Restricted Shares				Share-Settled RSUs				PSUs
	Shares		Weighted Avg. Grant Date Fair Value		Shares		Weighted Avg. Grant Date Fair Value		Shares		Weighted Avg. Grant Date Fair Value
Nonvested balance at January 1, 2018	410,251		$	49.95	—		$	—	—		$	—
Granted	17,440		55.05		253,257		55.02		214,348		50.75
Vested	(168,409	)	47.08		—		—		—		—
Forfeited	(5,108	)	48.68		(1,362	)	55.04		—		—
Nonvested balance at March 31, 2018	254,174		52.23		251,895		55.02		214,348		50.75
Granted	1,573		47.97		16,995		47.17		25,957		35.64
Vested	(60,434	)	49.89		(192	)	55.04		—		—
Forfeited	(2,482	)	57.15		(8,001	)	55.04		(4,051	)	50.75
Nonvested balance at June 30, 2018	192,831		53.14		260,697		54.51		236,254		49.28
Granted	—		—		14,903		42.22		8,623		32.24
Vested	(6,443	)	53.31		—		—		—		—
Forfeited	(1,210	)	62.79		(6,408	)	55.04		(5,882	)	50.75
Nonvested balance at September 30, 2018	185,178		$	53.07	269,192		$	57.51	238,995		$	48.68