Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

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, 2017	32,266,391	$	44.14	7.03	$	744.1
Options granted	—
Options exercised	(834,925)
Options forfeited	(45,660)
Options outstanding at March 31, 2017	31,385,806	$	44.54	6.85	$	835.7
Vested and non-vested options expected to vest at March 31, 2017	29,778,073	$	44.04	6.78	$	807.9
Exercisable options at March 31, 2017	12,788,636	$	33.31	5.20	$	484.2

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

		Weighted
		Average Fair
		Value at Grant
	Options	Date
Non-vested options at January 1, 2017	18,725,570	$	7.99
Options granted	—		—
Options vested	(82,740)		8.17
Options forfeited	(45,660)		7.84
Non-vested options at March 31, 2017	18,597,170	$	7.98

Summary of activity in the option plans

	Three Months Ended
	March 31,
	2017		2016
Total intrinsic value of stock options exercised	$	34.5	$	20.7
Total fair value of stock options vested		0.7		0.4

Schedule of restricted share activity

				Weighted
				Average Remaining
	Restricted	Fair Value at		Amortization Term
	Shares	Grant Date		(in years)
Restricted shares outstanding at January 1, 2017	16,905	$	57.99	0.38
Restricted shares granted	—		—
Restricted shares outstanding at March 31, 2017	16,905	$	57.99	0.13