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Stock-Based Compensation - Schedule of Options Granted Under LTIP and TSOP (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)	43,770
Granted (in dollars per share)	$ 213.54
LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)	43,770	47,360	40,960
Granted (in dollars per share)	$ 52.05	$ 45.74	$ 41.70
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)	178,190	219,710	217,290
Granted (in dollars per share)	$ 210.11	$ 164.47	$ 148.37
Performance Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)	78,830	102,250	92,314
Granted (in dollars per share)	$ 212.66	$ 160.97	$ 147.47

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- Definition

Net number of share options (or share units) granted during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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