Long-term Equity-based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The assumptions used in the Black-Scholes pricing model for Tandem Awards granted during the years ended December 31, 2020, 2019 and 2018 are presented below.

	2020					2019					2018
RANGE OF VALUATION ASSUMPTIONS
Expected Volatility	29.22	%	-	37.27	%	28.97	%	-	33.78	%	27.31	%	-	32.15	%
Risk-free Interest Rate	0.17		-	1.46		1.35		-	2.60		2.44		-	3.00
Expected Dividend Yield	1.19		-	1.48		1.05		-	1.38		1.16		-	1.72
WEIGHTED-AVERAGE EXPECTED LIFE IN YEARS
Employee Grants	4		-	6		4		-	6		4		-	6

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

Tandem Award activity for the year ended December 31, 2020 is presented below.

	Shares Subject to Awards	Weighted- average Exercise Price Per Share ($)		Weighted- average Remaining Contractual Life (in Years)	Aggregate Intrinsic Value ($ In Millions)
Outstanding at Beginning of the Year	1,808,815	$	56.53
Granted	375,534	75.91
Exercised	(215,700)	45.64
Forfeited or Expired	(67,692)	73.88
Outstanding at December 31, 2020	1,900,957	60.97		7.11	$	30.6
Vested and Expected to Vest at December 31, 2020	1,823,133	$	60.47	7.06	$	30.3
Exercisable at December 31, 2020	1,045,250	$	50.78	6.06	$	27.4

Schedule of Options Outstanding

Information pertaining to Tandem Awards outstanding at December 31, 2020 is presented below.

					Outstanding				Exercisable
Range of Exercise Prices ($)					Shares Subject to Awards	Weighted- average Exercise Price Per Share ($)		Weighted- average Remaining Contractual Life (in Years)	Shares Subject to Awards	Weighted- average Exercise Price Per Share ($)
$	20.01	-	$	30.00	108,562	$	27.79	5.03	108,562	$	27.79
30.01		-	40.00		128,727	34.65		4.42	128,727	34.65
40.01		-	50.00		354,641	42.47		5.75	354,641	42.47
50.01		-	60.00		375,420	59.88		6.89	231,918	59.87
60.01		-	70.00		77,132	66.62		7.26	40,295	66.90
70.01		-	80.00		812,286	76.34		8.44	165,104	76.28
80.01		-	90.00		44,189	84.78		7.97	16,003	85.24
20.01		-	90.00		1,900,957	60.97		7.11	1,045,250	50.78

Schedule of Share-based Compensation, Nonemployee Director Deferred Stock Unit Award Plan, Activity

Activity related to DSU awards for the year ended December 31, 2020 is presented below.

	Number of DSUs	Weighted- average Grant-date Fair Value Per DSU
Vested Balance at Beginning of the Year	44,820	$	44.74
Reduction for Shares Issued on Conversion	—	—
Vested Balance at December 31, 2020	44,820	$	44.74

Time Vested Restricted Stock Units

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Restricted Stock Units and Performance Stock Units Activity

Activity related to nonvested RSUs for the year ended December 31, 2020 is presented below.

	Time-based Restricted Stock Unit Awards
	Number of Restricted Stock Units	Weighted- average Grant-date Fair Value Per Unit
Nonvested Balance at Beginning of the Year	182,188	$	71.12
Granted	68,325	68.38
Vested	(106,807)	68.54
Forfeited	(11,680)	65.37
Nonvested Balance at December 31, 2020	132,026	$	72.30

Performance Based Restricted Stock Units

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Restricted Stock Units and Performance Stock Units Activity

Activity related to nonvested PSU awards for the year ended December 31, 2020 is presented below.

	PSU Awards
	Number of PSUs	Weighted- average Grant-date Fair Value Per PSU
Nonvested Balance at Beginning of the Year	360,820	$	66.42
Granted	340,579	74.99
Vested	(165,672)	45.90
Forfeited	(32,870)	79.69
Nonvested Balance at December 31, 2020	502,857	$	78.12