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Equity Incentive Plan

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Table of Performance Share Unit Monte Carlo Assumptions [Table Text Block]

			2020						2019						2018
Risk-free interest rate			0.18		%				1.69		%				3.03		%
Expected life in years			3						3						3
Expected volatility			26		%				24		%				26		%
Expected dividend yield			—						—						—

Schedule of Stock Options, Activity

			Number of Options						Weighted Average Exercise Price						Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2019			608,715						$	334.20					$	279.5
Granted			16,273						1,103.74
Exercised			(141,139)						319.84
Forfeited			(9,746)						505.95
Outstanding at December 31, 2020			474,103						400.21						350.6
Options exercisable at December 31, 2020			367,451						$	319.84					$	301.3

Schedule Shares Outstanding under Stock Option Plans, by Exercise Price Range

Number of Options Outstanding						Weighted Average Exercise Price						Remaining Contractual Life of Options Outstanding						Options Exercisable
			78,288												$168.98									1.8						78,288
131,501						$253.87						3.3						131,501
128,642						$357.51						5.4						105,179
135,672						$715.98						8.1						52,483
474,103												5.0						367,451

Schedule of Stock Options, Valuation Assumptions

			2020						2019						2018
Risk-free interest rate			0.34		%				1.74		%				3.09		%
Expected life in years			6.0						6.0						5.9
Expected volatility			26		%				24		%				26		%
Expected dividend yield			—						—						—

Schedule Restricted Stock Units, Activity

			Number of Restricted Stock Units						Aggregate Intrinsic Value (in millions)						Number of Performance Share Units						Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2019			40,985						$32.5						17,183						$13.6
Granted			8,285												2,690
Adjustment for performance results achieved(1)			—												1,838
Vested			(14,667)												(6,370)
Forfeited			(1,507)												—
Outstanding at December 31, 2020			33,096						$37.7						15,341						$17.5

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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