Share-Based Compensation and Capital Stock - Summary of Change in Stock-Based Award Activity (Details) - $ / shares	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at January 1 - Shares	1,976,326	2,193,502	2,084,201
Granted - Shares	109,045	195,652	745,769
Exercised - Shares	(832,809)	(353,744)	(529,210)
Expired - Shares	(2,018)	(10,133)	(13,620)
Forfeited - Shares	(64,364)	(48,951)	(93,638)
Outstanding at December 31 - Shares	1,186,180	1,976,326	2,193,502
Options Exercisable at December 31 - Shares	753,681	1,279,500	816,969
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding at January 1 - Weighted average exercise price (in dollars per share)	$ 50.80	$ 48.26	$ 41.36
Granted - Weighted average exercise price (in dollars per share)	81.55	60.70	51.49
Exercised - Weighted average exercise price (in dollars per share)	49.66	39.88	24.47
Expired - Weighted average exercise price (in dollars per share)	63.47	56.95	57.62
Forfeited - Weighted average exercise price (in dollars per share)	55.79	54.12	53.63
Outstanding at December 31 - Weighted average exercise price (in dollars per share)	54.13	50.80	48.26
Options Exercisable at December 31 - Weighted average exercise price (in dollars per share)	$ 49.55	$ 48.76	$ 40.75
Weighted Average Remaining Contractual Life - Options Outstanding at December 31	3 years 5 months 18 days	4 years 1 month 7 days	4 years 7 months 13 days
Weighted Average Remaining Contractual Life - Options Exercisable at December 31	2 years 8 months 28 days	3 years 8 months 16 days	3 years 3 months 4 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at January 1 - Shares	348,876	407,812	384,490
Granted - Shares	101,325	175,644	204,333
Vested - Shares	(99,651)	(204,205)	(152,015)
Forfeited - Shares	(46,785)	(30,375)	(28,996)
Outstanding at December 31 - Shares	303,765	348,876	407,812
Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding at January 1 - Weighted average grant date fair value (in dollars per share)	$ 57.05	$ 50.61	$ 47.40
Granted (in dollars per share)	81.21	61.84	51.53
Vested - Weighted average grant date fair value (in dollars per share)	55.64	48.61	43.61
Forfeited - Weighted average grant date fair value (in dollars per share)	60.40	55.02	51.22
Outstanding at December 31 - Weighted average grant date fair value (in dollars per share)	$ 65.06	$ 57.05	$ 50.61
Performance Vested Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at January 1 - Shares	294,204	235,980	226,737
Granted - Shares	100,919	162,523	89,944
Performance-Based Leveraging - Shares	0	9,491	2,043
Vested - Shares	(31,048)	(39,056)	(28,188)
Forfeited - Shares	(27,255)	(74,734)	(54,556)
Outstanding at December 31 - Shares	336,820	294,204	235,980
Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding at January 1 - Weighted average grant date fair value (in dollars per share)	$ 56.95	$ 47.59	$ 45.09
Granted (in dollars per share)	81.25	60.63	47.85
Performance-Based Leveraging - Weighted average grant date fair value (in dollars per share)		45.59	36.76
Vested - Weighted average grant date fair value (in dollars per share)	60.60	46.22	36.76
Forfeited - Weighted average grant date fair value (in dollars per share)	64.49	39.59	42.82
Outstanding at December 31 - Weighted average grant date fair value (in dollars per share)	$ 63.28	$ 56.95	$ 47.59

The number of equity-based instruments increased due to exceeding the targeted performance conditions of a grant.

No definition available.

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The weighted average fair value as of grant date for the equity-based award plan other than stock (or unit) option plan increase due to exceeding the targeted performance conditions of a grant.

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Weighted Average Grant Date Fair Value [Roll Forward]

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

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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.

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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).

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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.

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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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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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

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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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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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