Stock Based Compensation Plans

9 Months Ended

Sep. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Based Compensation Plans

6. Stock Based Compensation Plans

The following table provides a summary of option activity:

						Weighted
						Average
				Weighted		Remaining
				Average		Contractual		Aggregate
				Exercise		Term		Intrinsic
	Options			Price		(in Years)		Value
Outstanding at December 31, 2018		14.7		$	37.63
Granted		1.4			77.30
Exercised		(1.9	)		26.50
Cancelled		(0.1	)		54.06
Outstanding at September 30, 2019		14.1		$	43.02		5.6	$	456.7
Exercisable at September 30, 2019		8.7		$	34.09		4.0	$	359.1

The following table provides information regarding the intrinsic value of stock options exercised and stock compensation expense related to stock option awards:  

	Three Months Ended				Nine Months Ended
	September 30,		September 30,		September 30,		September 30,
	2019		2018		2019		2018
Intrinsic Value of Stock Options Exercised	$	15.7	$	26.8	$	87.6	$	72.0
Stock Compensation Expense Related to Stock Option Awards	$	2.7	$	3.7	$	17.2	$	18.7
Issued Stock Options		0.0	0.0			1.4		1.9
Weighted Average Fair Value of Stock Options issued (per share)	$	0.0	$	0.0	$	14.94	$	9.63
Fair Value of Stock Options Issued	$	0.0	$	0.0	$	21.3	$	18.1

The following table provides a summary of the assumptions used in the valuation of issued stock options:

	Three Months Ended		Nine Months Ended
	September 30,	September 30,	September 30,			September 30,
	2019	2018	2019			2018
Risk-free interest rate	-	-		2.1	%		2.9	%
Expected life in years	-	-		7.3			7.3
Expected volatility	-	-		17.2	%		17.1	%
Dividend yield	-	-		1.2	%		1.7	%