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Share-Based Compensation Plans - Schedule of Grants and Weighted-average Per Share (Details) - $ / shares shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares granted, options and non-options (in shares)	363	419
Weighted-average per share value, options and non-options (in dollars per share)	$ 88.76	$ 68.99
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted, options (in shares)	122	145
Weighted-average per share fair value, options (in dollars per share)	$ 31.46	$ 25.58
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted, non-options (in shares)	10	10
Weighted-average per share fair value, non-options (in dollars per share)	$ 126.11	$ 88.87
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted, non-options (in shares)	137	149
Weighted-average per share fair value, non-options (in dollars per share)	$ 117.60	$ 92.67
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted, non-options (in shares)	94	115
Weighted-average per share fair value, non-options (in dollars per share)	$ 117.19	$ 91.41

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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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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://www.xbrl.org/2003/role/presentationRef
-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=6415400&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://www.xbrl.org/2003/role/presentationRef
-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=6415400&loc=d3e5070-113901

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- Definition

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

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

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