Share-Based Compensation (Share-Based Compensation Options Outstanding Rollforward) (Details) - $ / shares	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Number of Options
Number of options outstanding, beginning balance (in shares)	2,961,167	2,339,667	2,420,922
Granted (in shares)	560,000	840,000	120,000
Exercised (in shares)	(471,216)	(71,500)	(191,255)
Cancelled (in shares)	(10,000)	(147,000)	(10,000)
Number of options outstanding, ending balance (in shares)	3,039,951	2,961,167	2,339,667
Number of options exercisable (in shares)	1,464,411
Weighted Average Exercise Price per Share
Number of options outstanding, beginning balance (in USD per share)	$ 210.59	$ 204.53	$ 201.31
Number of options outstanding, ending balance (in USD per share)	216.04	$ 210.59	$ 204.53
Number of options exercisable (in USD per share)	$ 202.97
Service-Based Stock Options
Number of Options
Number of options outstanding, beginning balance (in shares)	2,231,167	2,339,667	2,420,922
Granted (in shares)	140,000	70,000	120,000
Exercised (in shares)	(471,216)	(71,500)	(191,255)
Cancelled (in shares)	0	(107,000)	(10,000)
Number of options outstanding, ending balance (in shares)	1,899,951	2,231,167	2,339,667
Number of options exercisable (in shares)	1,464,411
Weighted Average Exercise Price per Share
Number of options outstanding, beginning balance (in USD per share)	$ 204.60	$ 204.53	$ 201.31
Number of options outstanding, ending balance (in USD per share)	208.16	$ 204.60	$ 204.53
Number of options exercisable (in USD per share)	$ 202.97
Performance-Based Stock Options
Number of Options
Number of options outstanding, beginning balance (in shares)	730,000	0	0
Granted (in shares)	420,000	770,000	0
Exercised (in shares)	0	0	0
Cancelled (in shares)	(10,000)	(40,000)	0
Number of options outstanding, ending balance (in shares)	1,140,000	730,000	0
Number of options exercisable (in shares)	0
Weighted Average Exercise Price per Share
Number of options outstanding, beginning balance (in USD per share)	$ 228.94	$ 0	$ 0
Number of options outstanding, ending balance (in USD per share)	229.16	$ 228.94	$ 0
Number of options exercisable (in USD per share)	$ 0

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of share options (or share units) exercised during the current period.

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