Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2016

Stock-Based Compensation

Schedule of stock option activity

	Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
Options outstanding at January 1, 2016	31,136,475		$	37.62	6.92	$	491.0
Options granted	245,000
Options exercised	(650,840	)
Options forfeited	(48,680	)
Options outstanding at March 31, 2016	30,681,955		37.97		6.75	609.9
Vested and non-vested options expected to vest at March 31, 2016	28,686,910		$	37.34	6.66	$	588.3
Exercisable options at March 31, 2016	13,206,995		$	27.03	5.15	$	406.6

Summary of status of non-vested options and changes during the year

	Options		Weighted Average Fair Value at Grant Date
Non-vested options at January 1, 2016	17,323,040		$	8.24
Options granted	245,000		6.98
Options vested	(44,400	)	9.82
Options forfeited	(48,680	)	8.38
Non-vested options at March 31, 2016	17,474,960		8.22

Summary of activity in the option plans

	Three months ended March 31,
	2016		2015
Total intrinsic value of stock options exercised	$	20.7	$	25.9
Total fair value of stock options vested	0.4		0.3

Schedule of restricted share activity

	Restricted Shares	Fair Value at Grant Date		Weighted Average Remaining Amortization Term (in years)
Restricted shares outstanding at January 1, 2016	17,256	$	57.97	0.39
Restricted shares granted	—	—		—
Restricted shares outstanding at March 31, 2016	17,256	57.97		0.15