Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Stock-Based Compensation

Schedule of stock option activity

				Weighted
				Average	Aggregate
		Weighted		Remaining	Intrinsic
		Average		Contractual	Value
	Options	Exercise Price		Term (in years)	(in millions)
Options outstanding at January 1, 2018	33,222,364	$	52.27	7.05	$	1,180.3
Options granted	—
Options exercised	(602,549)
Options forfeited	(32,240)
Options outstanding at March 31, 2018	32,587,575		52.58	6.84		1,093.2
Options granted	6,111,100
Options exercised	(740,046)
Options forfeited	(116,740)
Options outstanding at June 30, 2018	37,841,889	$	58.50	7.15	$	1,089.4
Vested and non-vested options expected to vest at June 30, 2018	35,378,287	$	57.63	7.06	$	1,048.7
Exercisable options at June 30, 2018	18,269,909	$	45.14	5.65	$	767.5

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

		Weighted
		Average
		Fair Value at
	Options	Grant Date
Non-vested options at January 1, 2018	19,600,440	$	8.29
Options granted	—		—
Options vested	(67,400)		8.13
Options forfeited	(32,240)		8.56
Non-vested options at March 31, 2018	19,500,800		8.29
Options granted	6,111,100		12.82
Options vested	(5,923,180)		8.35
Options forfeited	(116,740)		8.18
Non-vested options at June 30, 2018	19,571,980	$	9.69

Summary of activity in the option plans

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Total intrinsic value of stock options exercised	$	35.1	$	79.6	$	69.4	$	114.1
Total fair value of stock options vested		49.5		44.8		50.0		45.5

Schedule of restricted share activity

				Weighted Average
				Remaining
	Restricted	Fair Value at		Amortization
	Shares	Grant Date		Term (in years)
Restricted shares outstanding at January 1, 2018	12,905	$	73.25	0.37
Restricted shares granted	—		—
Restricted shares outstanding at March 31, 2018	12,905		73.25	0.13
Shares vested and issued	(13,046)		73.35
Restricted shares granted	14,469		87.93
Restricted shares outstanding at June 30, 2018	14,328	$	87.98	0.88