Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Stock-Based Compensation [Abstract]

Schedule Of Assumptions Used To Estimate Value Of Each Option Award

	Year Ended December 31,
Assumption	2019		2018		2017
Expected volatility	28.4	%	25.9	%	27.7	%
Expected dividend yield	0.0	%	0.0	%	0.0	%
Expected life (in years)	5.0		6.3		6.3
Risk-free interest rate	2.49	%	2.63% - 2.94	%	1.83% - 2.29	%

Summary Of Option Activity Under The MSIP

					Aggregate	Weighted Avg.
		Weighted Avg.			Intrinsic	Remaining
	Stock	Exercise			Value	Contractual
	Options	Price			(in millions)	Term (in years)
Total outstanding, December 31, 2018	1,342,843	$	29.34	$	10	8.01
Granted to employees	634,743	$	40.04
Exercised	(407,337)	$	23.82
Forfeited	(339,728)	$	34.38
Expired	(1)	$	26.81
Total outstanding, December 31, 2019	1,230,520	$	35.30	$	5	7.36
Total exercisable, December 31, 2019	261,788	$	29.38	$	2	7.17

Summary Of RSU Activity Under The MSIP

		Weighted Avg.
		Grant Date
	RSUs	Fair Value
Total outstanding, December 31, 2018	526,744	$	35.75
Granted to employees	516,775	$	42.11
Vested	(227,616)	$	33.45
Forfeited	(122,977)	$	41.02
Total outstanding, December 31, 2019	692,926	$	40.11

Summary Of Performance Share Activity Under The Omnibus Incentive Plan

		Weighted Avg.
	Performance	Grant Date
	Shares	Fair Value
Total outstanding, December 31, 2018	—	$	—
Granted to executives	203,981	$	49.46
Forfeited	(16,235)	$	40.04
Total outstanding, December 31, 2019	187,746	$	50.13