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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, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted, options (in shares)	156	163
Total shares granted, options and non-options (in shares)	474	522
Weighted-average per share fair value, options (in dollars per share)	$ 18.95	$ 17.78
Weighted-average per share value, options and non-options (in dollars per share)	$ 64.18	$ 58.96
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted, non-options (in shares)	11	20
Weighted-average per share fair value, non-options (in dollars per share)	$ 97.10	$ 64.80
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted, non-options (in shares)	188	203
Weighted-average per share fair value, non-options (in dollars per share)	$ 86.47	$ 78.90
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted, non-options (in shares)	119	136
Weighted-average per share fair value, non-options (in dollars per share)	$ 85.25	$ 77.70

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- Definition

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

+ References

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

+ References

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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)
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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

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-Publisher FASB
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-SubTopic 10
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-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
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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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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
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