Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

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, 2020	35,675,206	$	67.70	6.75	$	1,445.9
Options granted	—		—
Options exercised	(715,546)		42.46
Options forfeited	(90,070)		80.19
Options outstanding at March 31, 2020	34,869,590	$	68.19	6.56	$	356.0
Vested and non-vested options expected to vest at March 31, 2020	32,960,912	$	67.56	6.49	$	350.4
Exercisable options at March 31, 2020	16,010,750	$	55.35	5.12	$	297.5

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, 2020	19,016,830	$	10.72
Options granted	—		—
Options vested	(67,920)		8.62
Options forfeited	(90,070)		10.89
Non-vested options at March 31, 2020	18,858,840	$	10.73

Summary of activity in the option plans

	Three Months Ended
	March 31,
	2020		2019
Total intrinsic value of stock options exercised	$	45.2	$	70.0
Total fair value of stock options vested		0.6		0.5

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, 2020	12,516	$	89.49	0.39
Restricted shares granted	—		—
Restricted shares outstanding at March 31, 2020	12,516	$	89.49	0.13