Capital Stock (Summary of RSU and PSU Activity) (Details) - $ / shares shares in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares, Nonvested at January 1 (in shares)	0.8
Shares, Granted (in shares)	0.4
Shares, Vested (in shares)	(0.4)
Shares, Cancelled (in shares)	0.0
Shares, Nonvested at December 31 (in shares)	0.8	0.8
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant date fair value, Outstanding at January 1 (in dollars per share)	$ 158.80
Weighted average grant date fair value, Granted (in dollars per share)	208.96	$ 175.96
Weighted average grant date fair value, Vested (in dollars per share)	149.09
Weighted average grant date fair value, Cancelled (in dollars per share)	154.38
Weighted average grant date fair value, Outstanding at December 31 (in dollars per share)	$ 187.72	$ 158.80
Performance Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares, Nonvested at January 1 (in shares)	0.2
Shares, Granted (in shares)	0.1
Shares, Vested (in shares)	(0.1)
Shares, Cancelled (in shares)	0.0
Shares, Nonvested at December 31 (in shares)	0.2	0.2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant date fair value, Outstanding at January 1 (in dollars per share)	$ 152.44
Weighted average grant date fair value, Granted (in dollars per share)	217.73
Weighted average grant date fair value, Vested (in dollars per share)	122.41
Weighted average grant date fair value, Cancelled (in dollars per share)	166.99
Weighted average grant date fair value, Outstanding at December 31 (in dollars per share)	$ 185.46	$ 152.44

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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)(3)
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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-Publisher FASB
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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).

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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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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-Name Accounting Standards Codification
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- Definition

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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

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-Publisher FASB
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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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