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Share-Based Compensation Plans - Shares Granted and Weighted Average Fair Value Per Share (Details) - $ / shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted, options (in shares)	130	156
Total shares granted, options and non-options (in shares)	542	474
Weighted-average per share fair value, options (in dollars per share)	$ 22.83	$ 18.95
Weighted-average per share value, options and non-options (in dollars per share)	$ 70.19	$ 64.18
Deferred Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted, non-options (in shares)	12	11
Weighted-average per share fair value, non-options (in dollars per share)	$ 90.18	$ 97.10
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted, non-options (in shares)	197	188
Weighted-average per share fair value, non-options (in dollars per share)	$ 85.66	$ 86.47
Performance Share Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted, non-options (in shares)	203	119
Weighted-average per share fair value, non-options (in dollars per share)	$ 84.34	$ 85.25

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options and Non-Option Instruments, Grants in Period

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options and Non-Option Instruments, Grants in Period, Weighted Average Grant Date Fair Value

+ References

No definition available.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ 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)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ 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)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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