Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

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, 2021	67,985,648	$	37.58	6.79	$	1,890.4
Options granted	215,080		64.69
Options exercised	(757,598)		28.12
Options forfeited	(31,160)		42.37
Options outstanding at March 31, 2021	67,411,970	$	37.77	6.57	$	1,901.0
Vested and non-vested options expected to vest at March 31, 2021	64,076,188	$	37.47	6.50	$	1,826.2
Exercisable options at March 31, 2021	30,329,950	$	31.94	5.10	$	1,032.0

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, 2021	36,989,300	$	6.43
Options granted	215,080		12.11
Options vested	(91,200)		3.88
Options forfeited	(31,160)		5.77
Non-vested options at March 31, 2021	37,082,020	$	6.46

Summary of activity in the option plans

	Three Months Ended
	March 31,
	2021		2020
Total intrinsic value of stock options exercised	$	28.9	$	45.2
Total fair value of stock options vested		0.4		0.6

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, 2021	26,350	$	45.55	0.38
Restricted shares granted	—		—
Restricted shares outstanding at March 31, 2021	26,350	$	45.55	0.13