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Stock Based Compensation Plans

3 Months Ended

Mar. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

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, 2020		12.7		$	50.72
Exercised		(0.1	)		32.04
Outstanding at March 31, 2021		12.6		$	51.02		5.6	$	454.1
Exercisable at March 31, 2021		7.4		$	40.13		3.7	$	348.7

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
	March 31,		March 31,
	2021		2020
Intrinsic Value of Stock Options Exercised	$	9.5	$	14.3
Stock Compensation Expense Related to Stock Option Awards	$	3.1	$	2.7